NSC CS5530 Geodeâ ¢ cs5530 i/o companion multi-function south bridge Datasheet

Geode™ CS5530 I/O Companion
Multi-Function South Bridge
General Description
The CS5530 I/O companion is designed to work in conjunction with the GXLV and GXm series processors; all
members of the National Semiconductor® Geode™ family
of products. Together the Geode processor and CS5530
provide a system-level solution well suited for the high
performance needs of a host of devices such as digital
set-top boxes and thin client devices. Due to the low
power consumption of a GXLV processor, this solution
satisfies the needs of battery powered devices such as
National’s WebPAD™ system, a Geode GXLV processor/CS5530 based design. Also, thermal design is eased
allowing for fanless system design.
The CS5530 I/O companion is a PCI-to-ISA bridge (South
Bridge), ACPI-compliant chipset that provides AT/ISA
style functionality. To those familiar with PC architecture
this enables a quicker understanding of the CS5530’s
architecture. The device contains state-of-the-art power
management that enables systems, especially battery
powered systems, to significantly reduce power consumption.
Audio is supported through PCI bus master engines which
connect to an AC97 compatible codec such as the
National Semiconductor LM4548. If industry standard
audio is required, a combination of hardware and software
called Virtual System Architecture® (VSA™) technology is
provided.
The GXLV processor’s graphics/video output is connected
to the CS5530. The CS5530 graphics/video support
includes a PLL that generates the DOT clock for the GXLV
processor (where the graphics controller is located), video
acceleration hardware, gamma RAM plus three DACs for
RGB output to CRT, and digital RGB that can be directly
connected to TFT panels or NTSC/PAL encoders. The
digital RGB output can also be connected to the National
Semiconductor CS9210 Graphics Companion (a DSTN
Controller) for DSTN panel support. The CS9210 is also a
member of the Geode product family.
Geode™ CS5530 Internal Block Diagram
PCI Bus
USB
PCI to USB Macro
PCI to X-Bus / X-Bus to PCI Bridge
GPIOs
Pwr Mgmt, Traps,
Events, and Timers
GPCS
X-Bus
Graphics
and Video
from CPU
Display
AT Compatibility Logic
Display Interface
Audio/Codec/MPU
Interface
MPEG, DOT Clock
CSC and SCL
RGB/FP Interface
ISA Bus Interface
AT Ports, ISA Megacells
Geode™ CS9210
Graphics Companion
Joystick
CS5530 Support
PCI Configuration
Registers
Active Decode
Address Mapper
X-Bus Arbiter
Ultra DMA/33
IDE
Interface
AC97 Codec
(e.g., LM4548)
Joystick / Game Port
ISA Bus
PC97317 SIO
IDE
National Semiconductor and Virtual System Architecture are registered trademarks of National Semiconductor Corporation.
Geode, VSA, and WebPAD are trademarks of National Semiconductor Corporation.
For a complete listing of National Semiconductor trademarks, please visit www.national.com/trademarks.
© 2000 National Semiconductor Corporation
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Geode™ CS5530 I/O Companion Multi-Function South Bridge
April 2000
Geode™ CS5530
Power Management
Two bus mastering IDE controllers are included for support of up to four ATA-compliant devices. A two-port Universal Serial Bus (USB) provides high speed, Plug & Play
expansion for a variety of consumer peripheral devices
such as a keyboard, mouse, printer, and digital cameras.
If additional functions are required, such as real-time
clock, floppy disk, PS2 keyboard, and PS2 mouse, a
SuperI/O (e.g., National PC97317) can be easily connected to the CS5530.
Features
General Features
Designed for use with the GXLV and GXm Geode
series processors
3.3V or 5.0V PCI bus compatible
5.0V tolerant I/O interfaces
3.3V core
PCI 2.1 compliant
Supports PCI initiator-to-ISA and ISA master-to-PCI
cycle translations
PCI master for audio I/O and IDE controllers
Subtractive agent for unclaimed transactions
PCI-to-ISA interrupt mapper/translator
Two 8259A-equivalent interrupt controllers
8254-equivalent timer
Two 8237-equivalent DMA controllers
Boot ROM and keyboard chip select
Extended ROM to 16 MB
Bus Mastering IDE Controllers
Up to eight GPIOs for system control:
— All eight are configurable as external wakeup events
Dedicated inputs for keyboard and mouse wakeup
events
Provides "back-end" hardware support via six buffered
PCI bus masters
AC97 codec interface:
— Specification Revision 1.3, 2.0, and 2.1 compliant
interface. Note that the codec (e.g., LM4548) must
have SRC (sample rate conversion) support
Display Subsystem Extensions
AT Compatibility
I/O traps and idle timers for peripheral power
management
XpressAUDIO
352-Terminal Tape Ball Grid Array (TBGA) package
PCI-to-ISA Bridge
Intelligent system controller supports multiple power
management standards:
— Full ACPI and Legacy (APM) support
— Directly manages all GXLV and GXm processor
power states (including automatic Suspend modulation for optimal performance/thermal balancing)
Two controllers with support for up to four IDE devices
Independent timing for master and slave devices for
both channels
Complements the GXLV and GXm processor’s
graphics and video capabilities:
— Three independent line buffers for accelerating
video data streams
— Handles asynchronous video and graphics data
streams concurrently from the processor
— YUV to RGB conversion hardware
— Arbitrary X & Y interpolative scaling
— Color keying for graphics/video overlay
VDACs / Display interface:
— Three integrated DACs
— Gamma RAM:
– Provides gamma correction for graphics data
streams
– Provides brightness/contrast correction for video
data streams
— Integrated DOT clock generator
— Digital RGB interface drives TFT panels or standard
NTSC/PAL encoders
Universal Serial Bus
PCI bus master burst reads and writes
Ultra DMA/33 (ATA-4) support
Two independent USB interfaces:
— Open Host Controller Interface (OpenHCI)
specification compliant
— Second generation proven core design
Multiword DMA support
Programmed I/O (PIO) Modes 0-4 support
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2
Revision 4.1
1.0
Architecture Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
2.0
Signal Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1
2.2
3.0
PCI BUS INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ISA BUS INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
AT COMPATIBILITY LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.1
DMA Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.2
Programmable Interval Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.3
Programmable Interrupt Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
IDE CONTROLLERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
POWER MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.5.1
GPIO Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
XPRESSAUDIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6.1
AC97 Codec Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6.2
VSA Technology Support Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DISPLAY SUBSYSTEM EXTENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CLOCK GENERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
UNIVERSAL SERIAL BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PROCESSOR SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PIN ASSIGNMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SIGNAL DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1
Reset Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2
Clock Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.3
CPU Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.4
PCI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.5
ISA Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.6
ROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.7
IDE Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.8
USB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.9
Game Port and General Purpose I/O Interface . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.10 Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.11 Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.12 DCLK PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.13 Power, Ground, and Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.14 Internal Test and Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
22
22
22
23
24
27
30
31
32
32
33
34
38
39
39
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.1
PROCESSOR INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1.1
Display Subsystem Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.1.2
PSERIAL Pin Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.2
PCI BUS INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1
PCI Initiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2
PCI Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3
Special Bus Cycles–Shutdown/Halt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4
PCI Bus Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5
PCI Interrupt Routing Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.6
Delayed Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2.1
Revision 4.1
Video Retrace Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3
45
45
46
47
47
48
48
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Geode™ CS5530
Table of Contents
Geode™ CS5530
Table of Contents (Continued)
3.3
RESETS AND CLOCKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1
Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2
ISA Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.3
DOT Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.3.1
3.4
3.4.3
3.5.3
3.5.4
60
70
72
73
75
82
3.5.5
86
87
89
89
90
Direct Memory Access (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmable Interval Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmable Interrupt Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCI Compatible Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
92
94
95
98
I/O Ports 092h and 061h System Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
3.5.5.1
3.5.5.2
3.5.5.3
3.5.6
Delayed PCI Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limited ISA and ISA Master Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ISA Bus Data Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Recovery Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ISA DMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Megacells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
3.5.4.1
3.5.4.2
3.5.4.3
3.5.4.4
I/O Port 092h System Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
I/O Port 061h System Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
SMI Generation for NMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Keyboard Interface Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.5.6.1
Fast Keyboard Gate Address 20 and CPU Reset . . . . . . . . . . . . . . . . . . . . . . . . 103
3.5.7
External Real-Time Clock Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IDE CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.1
IDE Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.2
IDE Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.2.1
3.6.2.2
3.6.2.3
104
105
105
106
PIO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Bus Master Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Ultra DMA/33 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
XPRESSAUDIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
3.7.1
Subsystem Data Transport Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
3.7.1.1
3.7.1.2
3.7.1.3
3.7.1.4
3.7.1.5
3.7.2
Audio Bus Masters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Physical Region Descriptor Table Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Physical Region Descriptor Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
AC97 Codec Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
VSA Technology Support Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
3.7.2.1
3.7.2.2
3.7.2.3
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Device Idle Timers and Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Purpose Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACPI Timer Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Purpose I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Management SMI Status Reporting Registers . . . . . . . . . . . . . . . . . . . . . .
Device Power Management Register Programming Summary . . . . . . . . . . . . . . .
PC/AT COMPATIBILITY LOGIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
3.5.1
ISA Subtractive Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
3.5.2
ISA Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
3.5.2.1
3.5.2.2
3.5.2.3
3.5.2.4
3.5.2.5
3.7
Suspend Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3 Volt Suspend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Save-To-Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Peripheral Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
3.4.3.1
3.4.3.2
3.4.3.3
3.4.3.4
3.4.3.5
3.4.3.6
3.6
DCLK Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
POWER MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.1
APM Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.2
CPU Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3.4.2.1
3.4.2.2
3.4.2.3
3.5
49
49
49
50
VSA Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Audio SMI Related Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
IRQ Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
4
Revision 4.1
3.8
DISPLAY SUBSYSTEM EXTENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
3.8.1
Video Interface Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
3.8.2
Video Accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
3.8.2.1
3.8.2.2
3.8.2.3
3.8.2.4
3.8.2.5
3.8.3
3.8.4
3.8.5
Video Overlay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Gamma RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
3.8.5.1
3.8.5.2
3.8.5.3
3.9
4.0
4.4
4.5
4.6
UNIVERSAL SERIAL BUS SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.1
USB PCI Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.2
USB Host Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.3
USB Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
135
135
136
136
PCI CONFIGURATION SPACE AND ACCESS METHODS . . . . . . . . . . . . . . . . . . . . . . .
REGISTER SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHIPSET REGISTER SPACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1
Bridge Configuration Registers - Function 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.2
SMI Status and ACPI Timer Registers - Function 1 . . . . . . . . . . . . . . . . . . . . . . .
4.3.3
IDE Controller Registers - Function 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.4
XpressAUDIO Registers - Function 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5
Video Controller Registers - Function 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
USB CONTROLLER REGISTERS - PCIUSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ISA LEGACY I/O REGISTER SPACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V-ACPI I/O REGISTER SPACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
138
139
149
149
179
184
188
199
206
208
217
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
5.1
5.2
5.3
5.4
5.5
5.6
5.7
6.0
Video DACs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
VESA DDC2B / DPMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Flat Panel Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
4.1
4.2
4.3
5.0
Line Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Video Port Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Video Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
X and Y Scaler / Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Color-Space-Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
TEST MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1
Nand Tree Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.1
Pull-Up Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.2
Unused Input Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.3
NC-Designated Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.4
Power/Ground Connections and Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECOMMENDED OPERATING CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIDEO CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
224
225
227
227
227
227
227
227
227
228
230
234
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Appendix A
A.1
Revision 4.1
Support Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
5
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Geode™ CS5530
Table of Contents (Continued)
Geode™ CS5530
1.0
Architecture Overview
The Geode CS5530 can be described as providing the
functional blocks shown in Figure 1-1.
1.1
PCI BUS INTERFACE
The CS5530 provides a PCI bus interface that is both a
slave for PCI cycles initiated by the CPU or other PCI
master devices, and a non-preemptable master for DMA
transfer cycles. The chip also is a standard PCI master for
the IDE controllers and audio I/O logic. The CS5530 supports positive decode for configurable memory and I/O
regions and implements a subtractive decode option for
unclaimed PCI accesses. The CS5530 also generates
address and data parity and performs parity checking.
The CS5530 does not include the PCI bus arbiter, it is
located in the processor.
• PCI bus master/slave interface
• ISA bus interface
• AT compatibility logic
• IDE controllers
• Power management
- GPIO interfaces
- Traps, Events, Timers
• Joystick/Game Port interface
Configuration registers are accessed through the PCI
interface using the PCI Bus Type 1 configuration mechanism as described in the PCI 2.1 Specification.
• Virtual audio support hardware
• Video display, which includes MPEG accelerator,
RAMDAC, and video ports
• USB controllers
For CPU interface connection refer to Figure 1-5 on page
11.
PCI Bus
USB
PCI to USB Macro
PCI to X-Bus / X-Bus to PCI Bridge
GPIOs
Pwr Mgmt, Traps,
Events, and Timers
GPCS
X-Bus
Graphics
and Video
from CPU
Display
AT Compatibility Logic
Display Interface
Audio/Codec/MPU
Interface
MPEG, DOT Clock
CSC and SCL
RGB/FP Interface
Geode™ CS9210
Graphics Companion
Joystick
ISA Bus Interface
AT Ports, ISA Megacells
CS5530 Support
PCI Configuration
Registers
Active Decode
Address Mapper
X-Bus Arbiter
Ultra DMA/33
IDE
Interface
AC97 Codec
(e.g., LM4548)
Joystick / Game Port
ISA Bus
PC97317 SIO
IDE
Figure 1-1. Internal Block Diagram
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6
Revision 4.1
1.2
ISA BUS INTERFACE
1.3.1 DMA Controller
The CS5530 supports the industry standard DMA architecture using two 8237-compatible DMA controllers in
cascaded configuration. CS5530-supported DMA functions include:
The CS5530 provides an ISA bus interface for unclaimed
memory and I/O cycles on PCI. The CS5530 is the default
subtractive decoding agent and forwards all unclaimed
memory and I/O cycles to the ISA interface; however, the
CS5530 may be configured to ignore either I/O, memory
or all unclaimed cycles (subtractive decode disabled).
• Standard seven-channel DMA support
• 32-bit address range support via high page registers
The CS5530 supports two modes on the ISA interface.
The default mode, Limited ISA Mode, supports the full
memory and I/O address range without ISA mastering.
The address and data buses are multiplexed together,
requiring an external latch to latch the lower 16 bits of
address of the ISA cycle. The signal SA_LATCH is generated when the data on the SA/SD bus is a valid address.
Additionally, the upper four address bits, SA[23:20] are
multiplexed on GPIO[7:4].
• IOCHRDY extended cycles for compatible timing
transfers
• ISA bus master device support using cascade mode
1.3.2 Programmable Interval Timer
The CS5530 contains an 8254-equivalent programmable
interval timer. This device has three timers, each with an
input frequency of 1.193 MHz.
The second mode, ISA Master Mode, supports ISA bus
masters and requires no external circuitry. When the
CS5530 is placed in ISA Master Mode, a large number of
pins are redefined. In this mode of operation the CS5530
cannot support TFT flat panels or TV controllers, since
most of the signals used to support these functions have
been redefined. This mode is required if ISA slots or ISA
masters are used. ISA master cycles are only passed to
the PCI bus if they access memory. I/O accesses are left
to complete on the ISA bus.
1.3.3 Programmable Interrupt Controller
The CS5530 contains two 8259-equivalent programmable
interrupt controllers, with eight interrupt request lines
each, for a total of 16 interrupts. The two controllers are
cascaded internally, and two of the interrupt request
inputs are connected to the internal circuitry. This allows a
total of 13 externally available interrupt requests.
Each CS5530 IRQ signal can be individually selected as
edge- or level-sensitive. The PCI interrupt signals are
routed internally to the PIC IRQs.
For further information regarding mode selection and
operational details refer to Section 3.5.2.2 “Limited ISA
and ISA Master Modes” on page 87.
1.3
1.4
IDE CONTROLLERS
The CS5530 integrates two PCI bus mastering, ATA-4
compatible IDE controllers. These controllers support
Ultra DMA/33 (enabled in Microsoft Windows 95 and Windows NT by using a driver provided by National Semiconductor), Multiword DMA and Programmed I/O (PIO)
modes. Two devices are supported on each controller.
The data-transfer speed for each device on each controller can be independently programmed. This allows highspeed IDE peripherals to coexist on the same channel as
lower speed devices. Faster devices must be ATA-4 compatible.
AT COMPATIBILITY LOGIC
The CS5530 integrates:
• Two 8237-equivalent DMA controllers with full 32-bit
addressing
• Two 8259-equivalent interrupt controllers providing 13
individually programmable external interrupts
• An 8254-equivalent timer for refresh, timer, and
speaker logic
• NMI control and generation for PCI system errors and
all parity errors
• Support for standard AT keyboard controllers
• Positive decode for the AT I/O register space
• Reset control
Revision 4.1
7
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Geode™ CS5530
Architecture Overview (Continued)
Geode™ CS5530
Architecture Overview (Continued)
1.5
POWER MANAGEMENT
The hardware portion of the XpressAUDIO subsystem
can broadly be divided into two categories. Hardware for:
The CS5530 integrates advanced power management
features including:
• Transporting streaming audio data to/from the system
memory and an AC97 codec.
• Idle timers for common system peripherals
• VSA technology support.
• Address trap registers for programmable address
ranges for I/O or memory accesses
1.6.1 AC97 Codec Interface
The CS5530 provides an AC97 Specification Revision
1.3, 2.0, and 2.1 compatible interface. Any AC97 codec
which supports an independent input and output sample
rate conversion interface (e.g., National Semiconductor
LM4548) can be used with the CS5530. This type of
codec will allow for a design which meets the requirements for PC97 and PC98-compliant audio as defined by
Microsoft Corporation. Figure 1-2 shows the codec and
CS5530 signal connections. For specifics on the serial
interface, refer to the appropriate codec manufacturer’s
data sheet.
• Up to eight programmable GPIOs
• Clock throttling with automatic speedup for the CPU
clock
• Software CPU stop clock
• Zero Volt Suspend/Resume with peripheral shadow
registers
• Dedicated serial bus to/from the GXLV processor
providing CPU power management status
The CS5530 is an ACPI (Advanced Control and Power
Interface) compliant chipset. An ACPI compliant system is
one whose underlying BIOS, device drivers, chipset and
peripherals conform to revision 1.0 or newer of the ACPI
specification. The “Fixed Feature” and “General Purpose”
registers are virtual. They are emulated by the SMI handling code rather than existing in physical hardware. To
the ACPI compliant operating system, the SMI-base virtualization is transparent; however, to eliminate unnecessary latencies, the ACPI timer exists in physical hardware.
Low latency audio I/O is accomplished by a buffered PCI
bus mastering controller.
External Source
BITCLK
Geode™
CS5530 SYNC
The CS5530 V-ACPI (Virtual ACPI) solution provides the
following support:
PC_BEEP
BIT_CLK
24.576 MHz
SYNC
PC_BEEP AC97
• CPU States — C1, C2
Codec
SDAT_I
• Sleep States — S1, S2, S4, S4BIOS, S5
SDAT_O
SDATA_IN
SDATA_OUT
• Embedded Controller (Optional) — SCI and SWI event
inputs.
Figure 1-2. AC97 Codec Signal Connections
• General Purpose Events — Fully programmable GPE0
Event Block registers.
1.6.2 VSA Technology Support Hardware
The CS5530 I/O companion incorporates the required
hardware in order to support VSA technology for the capture and playback of audio using an external codec. This
eliminates much of the hardware traditionally associated
with industry standard audio functions.
1.5.1 GPIO Interface
Eight GPIO pins are provided for general usage in the
system. GPIO[3:0] are dedicated pins and can be configured as inputs or outputs. GPIO[7:4] can be configured as
the upper addresses of the ISA bus, SA[23:20]. All GPIOs
can also be configured to generate an SMI on input edge
transitions.
1.6
XpressAUDIO software provides 16-bit compatible sound.
This software is available to OEMs for incorporation into
the system BIOS ROM.
XPRESSAUDIO
XpressAUDIO in the CS5530 offers a combined hardware/software support solution to meet industry standard
audio requirements. XpressAUDIO uses VSA technology
along with additional hardware features to provide the
necessary support for industry standard 16-bit stereo synthesis and OPL3 emulation.
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8
Revision 4.1
Geode™ CS5530
Architecture Overview (Continued)
1.7
DISPLAY SUBSYSTEM EXTENSIONS
The CS5530 incorporates extensions to the GXLV processor’s display subsystem. These include:
• Gamma RAM
- Brightness and contrast control
• Video Accelerator
- Buffers and formats input YUV video data from
processor
- 8-bit interface to the GXLV processor
- X & Y scaler with bilinear filter
- Color space converter (YUV to RGB)
• Display Interface
- Integrated RGB Video DACs
- VESA DDC2B/DPMS support
- Flat panel interface
Figure 1-3 shows the data path of the display subsystem
extensions.
• Video Overlay Logic
- Color key
- Data switch for graphics and video data
Input
Formatter
Buffer 0
24
Formatter
/
Scaler
Buffer 1
VID_DATA[7:0]
Vertical
Filter
Color
Space
Converter
Horizontal
Filter
8
Buffer 2
(3x360x32 bit)
Video
24
Color Key
Register
24
24
24
PIXEL[23:0]
Enable Gamma
Correction Register
Color
Compare
Bypass
24
24
Gamma
RAM
24
Dither
18
FP_DATA
8 each
DAC
RGB to CRT
Figure 1-3. Display Subsystem Extensions, 8-Bit Interface
Revision 4.1
9
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Geode™ CS5530
Architecture Overview (Continued)
1.8
CLOCK GENERATION
1.9
In a CS5530/GXLV processor-based system, the CS5530
generates only the video DOT clock (DCLK) for the CPU
and the ISA clock. All other clocks are generated by an
external clock chip.
UNIVERSAL SERIAL BUS
The CS5530 provides two complete, independent USB
ports. Each port has a Data "–" and a Data "+" pin.
The USB controller is a compliant Open Host Controller
Interface (OpenHCI). The OpenHCI specification provides
a register-level description for a host controller, as well as
a common industry hardware/software interface and drivers (see OpenHCI Specification, Revision 1.0, for description).
The ISACLK is created by dividing the PCICLK. For ISA
compatibility, the ISACLK nominally runs at 8.33 MHz or
less. The ISACLK dividers are programmed via F0 Index
50h[2:0].
DCLK is generated from the 14.31818 MHz input
(CLK_14MHZ). A combination of a phase locked loop
(PLL), linear feedback shift register (LFSR) and divisors
are used to generate the desired frequencies for the
DCLK. The divisors and LFSR are configurable through
the F4BAR+Memory Offset 24h. For applications that do
not use the GXLV processor’s video, this is an available
clock for general purpose use.
Figure 1-4 shows a block diagram for clock generation
within the CS5530.
TVCLK
CLK_14MHZ
PCICLK
M
U
X
DCLK
÷N
ISACLK
DCLK
PLL
Figure 1-4. CS5530 Clock Generation
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10
Revision 4.1
1.10 PROCESSOR SUPPORT
The traditional south bridge functionality included in the
CS5530 I/O companion chip has been designed to support the GXLV processor. When combined with the GXLV
processor, the CS5530 provides a bridge which supports
a standard ISA bus and system ROM. As part of the video
subsystem, the CS5530 provides MPEG video acceleration and a digital RGB interface, to allow direct connection
to TFT LCD panels. This chip also integrates a gamma
RAM and three DACs, allowing for direct connection of a
CRT monitor. Figure 1-5 shows a typical system block diagram.
For detailed information regarding processor signal connections refer to Section 3.1 “Processor Interface” on
page 41.
Memory Data Bus
YUV Port
(Video)
Memory
Port
Memory
Geode™ GXLV
Processor
Clocks
Serial
Packet
USB
(2 Ports)
RGB Port
(Graphics)
CRT
PCI Interface
PCI Bus
TFT
Flat Panel
or TV
NTSC/PAL
Encoder
Speakers
Graphics Data
Video Data
CD
ROM
Audio
AC97
Codec
Analog RGB
Geode™ CS5530
I/O Companion
Digital RGB
Ultra DMA/33 IDE Bus
Microphone
SuperI/O
GPIOs
IDE Devices
BIOS
ISA Bus
DC-DC
&
Battery
Figure 1-5. System Block Diagram
Revision 4.1
11
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Geode™ CS5530
Architecture Overview (Continued)
Geode™ CS5530
2.0
Signal Definitions
This section defines the signals and describes the external interface of the Geode CS5530. Figure 2-1 shows the
CPU Interface
INTR
SMI#
IRQ13
PSERIAL
SUSP#
SUSPA#
SUSP_3V
HOLD_REQ#
PCI Bus
AD[31:0]
C/BE[3:0]#
INTA#-INTD#
REQ#
GNT#
FRAME#
IRDY#
TRDY#
STOP#
LOCK#
DEVSEL#
PAR
PERR#
SERR#
ROM Interface
KBROMCS#
Audio Interface
PC_BEEP
SDATA_OUT
SDATA_IN
SYNC
BIT_CLK
Display: Pixel
Port
Display: CRT
Display: TFT/TV
Display: MPEG
PCLK
PIXEL[23:0]
ENA_DISP
HSYNC
VSYNC
HSYNC_OUT
VSYNC_OUT
DDC_SCL
DDC_SDA
IREF
VREF
EXTVREFIN
AVDD1-3
AVSS1-5
IOUTR
IOUTG
IOUTB
pins organized by their functional groupings (internal test
and electrical pins are not shown).
USBCLK
TVCLK
DCLK
PCICLK
ISACLK
CLK14_MHZ
CLK_32K
PCI_RST#
POR#
CPU_RST
Geode™ CS5530
I/O Companion
IDE_ADDR[2:0]
IDE_RST#
IDE_CS0#
Note: Pins that change
IDE_CS1#
function when ISA Master
IDE_DREQ0
mode is invoked are repreIDE_DREQ1
IDE_DACK0#
sented with the ISA MasIDE_DACK1#
ter Mode function signal
IDE_IORDY0
name in parenthesis.
IDE_IORDY1
IDE_IOW0#
IDE_IOW1#
IDE_IOR0#
IDE_IOR1#
IDE_DATA[15:0]
Analog
FP_DATA17 (MASTER#)
FP_DATA16 (SA_OE#)
FP_DATA[15:0] (SA[15:0])
FP_CLK (No Function)
FP_CLK_EVEN (No Function)
FP_HSYNC_OUT (SMEMW#)
FP_VSYNC_OUT (SMEMR#)
FP_DISP_ENA_OUT (No Function)
FP_ENA_VDD (No Function)
FP_ENA_BKL (No Function)
FP_HSYNC (No Function)
FP_VSYNC (No Function)
VID_DATA[7:0]
VID_RDY
VID_CLK
VID_VAL
D+_PORT1
D–_PORT1
D+_PORT2
D–_PORT2
POWER_EN
OVER_CUR#
SA[19:16]
(SD[15:0]) SA[15:0]/SD[15:0]
(SA_DIR) SA_LATCH
SBHE#
BALE
IOCHRDY
ZEROWS#
IOCS16#
IOR#
IOW#
MEMCS16#
MEMR#
MEMW#
AEN
IRQ[15:14], [12:9], [7:3], 1
IRQ8#
DRQ[7:5], [3:0]
DACK#[7:5], [3:0]
TC
SMEMW#/RTCCS#
SMEMR#/RTCALE
Analog
PLLDVD
PLLVAA
PLLRO
PLLLP
PLLAGS
PLLAGD
PLLDGN
GPCS#
GPORT_CS#
(SA[23:20]) GPIO[7:4]/SA[23:20]
GPIO[3:2]
GPIO1/SDATA_IN2
GPIO0
Clocks
Reset
USB
IDE Controller
ISA Bus
External RTC
DCLKPLL
Game Port/
GPIO
Figure 2-1. CS5530 Signal Groups
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12
Revision 4.1
2.1
PIN ASSIGNMENTS
Table 2-1. Pin Type Definitions
The tables in this section use several common abbreviations. Table 2-1 lists the mnemonics and their meanings.
Mnemonic
Figure 2-2 shows the pin assignment for the CS5530 with
Tables 2-2 and 2-3 listing the pin assignments sorted by
terminal number and alphabetically by signal name,
respectively.
In Section 2.2 “Signal Descriptions” a description of each
signal within its associated functional group is provided.
In the signal definitions, references to F0-F4, F1BAR,
F2BAR, F3BAR, F4BAR, and PCIUSB are made. These
terms relate to designated register spaces. Refer to Table
4-1 "PCI Configuration Address Register (0CF8h)" on
page 138 for details regarding these register spaces and
their access mechanisms.
Revision 4.1
13
Definition
5VT
Buffer is 5V tolerant
I
Input pin
I/O
Bidirectional pin
IBUF
Input buffer
O
Output
OD
Open-drain output structure that
allows multiple devices to share the
pin in a wired-OR configuration
PU
Pull-up resistor
PD
Pull-down resistor
smt
Schmitt Trigger
t/s
Tri-state signal
VDD (PWR)
Power pin
VSS (GND)
Ground pin
#
The "#" symbol at the end of a signal
name indicates that the active, or
asserted state occurs when the signal
is at a low voltage level. When "#" is
not present after the signal name, the
signal is asserted when at a high voltage level.
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Geode™ CS5530
Signal Definitions (Continued)
Geode™ CS5530
Signal Definitions (Continued)
Index Corner
13
14
15
16
17
18
19
20
21
PCLK
INTA#
AD0
AD7
AD9
AD12
AD10
AD15
PAR
PIX15
PIX18 VDRDY PIX22 VDAT6 VDAT2 INTD#
AD3
AD5
AD6
C/BE0#
AD11
AD14 C/BE1# PERR# TRDY# IRDY#
AD18
AD19
PIX14
PIX17
PIX21
PIX23 VDAT3 VDAT7 VDAT1 PRST# INTC#
AD2
AD4
VSS
VDD
AD13
VSS
VDD
AD21
AD22
PIX13
VSS
PIX20
VDD
VSS
VDD
AD8
VSS
VSS
VDD
VSS
GNT#
AD26 C/BE3#
VSS
AD20
AD23
STOP#
1
2
3
4
5
6
7
8
9
10
PIX0
PIX1
PIX2
PIX7
PIX10
VCLK
PIX12
PIX16
PIX19
DCLK
ENADISP TVCLK
PIX4
PIX5
VSYNC
PIX8
VDVAL
FPVSY FPHSY
VDD
PIX3
PIX11
HSYN
FPD11
TEST
VSS
PIX6
PIX9
11
12
22
23
24
25
26
A
A
VDAT0 VDAT5
SERR# DVSL# C/BE2# AD17
AD16
B
B
C
C
LOCK# FRAM#
D
D
NC
VDAT4
VSS
VSS
AD1
INTB#
VSS
E
E
FPHSYO FPD10 FPVSYO VSS
F
F
FPD9 DISENO FPD17
VDD
VSS
VDD
AD24
AD27
FPD8
FPD5
FPD7
FPD6
VSS
AD25
AD28
AD29
FPD4
FPD15 FPD16
VSS
VSS
VDD
AD31 HDRQ#
FPD3
FPD1
ENBKL
VSS
AD30
REQ# PCICLK
VSS
VSS
POR# CPURST SUSP#
G
G
H
H
J
J
FPD2
K
K
FPD14
FPD13 FPD0
L
L
FPD12 ENVDD CKEVEN VDD
VDD SUSP3V SUSPA# PSERL
Geode™ CS5530
I/O Companion
M
FPCLK DDCSCL VSS DDCSDA
N
HSYNO VSYNO
VSS
AVDD3
P
AVSS4
AVSS5 IOUTR IOUTG
IOUTB
AVSS1
VREF
XVREFI AVDD2 AVSS3
AVSS2
VSS
PLVAA
PLRO
N
PLP
PLAGS PLAGD PLDGN
VSS
14MHZ
P
Top View
R
IREF
M
PLDVD
SMI#
INTR
R
IRQ13 DIOW0# DIOR1# DIOR0#
T
T
VDD DDCK1# DIOW1# DDCK0#
U
U
AVDD1
VDD
SYNC
SDATI
IDED7
IDED6
IDEA0
IDEA1
V
V
SDATO BITCLK PCBEEP PWREN
VSS
IDED8 IDED10 DCS0#
USBCLK
VSS
IDEA2
W
W
NC OVRCUR# VSS
DRST# IDED5
Y
Y
D–PT1 D+PT1
NC
VSS
VDD
IDED11 IDED9 DCS1#
D–PT2 D+PT2
NC
VSS
VSS
IDED1 IDED12 IDED4
AA
AA
AB
AB
NC
NC
NC
VDD
IDED15 IDED2 IDED13 IDED3
NC
NC
NC
VSS
NC
NC
NC
NC
NC
32K KRMCS# IRQ9
NC
NC SMEMW# SA7
1
2
AC
AC
VSS
SA3
DCK7# DCK1#
VSS
VDD
IOW#
VSS
VSS
IRQ3 MCS16#
VSS
IRQ14
VSS
VDD
SA10
GPIO5 GPIO0
VSS
DREQ1 IDED14 IDED0
ISACLK DCK6# DCK0#
SA2
SA19
SA16
DRQ1
DRQ3
IRQ7
SLTCH
VDD
IRQ15
DRQ5
SA9
VSS GPTCS# GPIO4
VDD
SA14 IORDY0 DREQ0
SA0
DRQ2
SA18
IOR#
IRQ5
IRQ8#
IRQ4
0WS# CHRDY SA17
IRQ1
IRQ6
TC
10
13
14
15
AD
AD
SMEMR# SA5
AE
AE
SA1
DCK5#
AEN
SA6
SA4
DCK3# DCK2# BALE
5
6
IRQ10 SBHE# DRQ0 MEMR# DRQ6
SA12
SA13
GPIO6 GPIO1
SA15 IORDY1
MEMW# SA11
DRQ7
GPIO7 GPIO3 GPIO2 GPCS#
AF
AF
3
4
7
8
9
11
12
CS16# IRQ12
16
17
IRQ11
SA8
18
19
20
21
22
23
24
25
26
Note: Signal names have been abbreviated in this figure due to space constraints.
= Multiplexed signal
= GND terminal
= PWR terminal
= Changes function in ISA Master Mode
Figure 2-2. TBGA Pin Assignment Diagram
Order Number: 25420-03
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14
Revision 4.1
Table 2-2. 352 TBGA Pin Assignments - Sorted by Pin Number
Signal Name
Pin
No.
Limited
ISA Mode
A1 PIXEL0
ISA Master
Mode
Signal Name
Pin
No.
Limited
ISA Mode
ISA Master
Mode
B26 AD19
Signal Name
Pin
No.
Limited
ISA Mode
ISA Master
Mode
D25 AD26
A2 PIXEL1
C1 FP_VSYNC
No Function
A3 PIXEL2
C2 FP_HSYNC
No Function
A4 PIXEL7
C3 VDD
E2 FP_DATA10
SA10
A5 PIXEL10
C4 PIXEL3
E3 FP_VSYNC_OUT
SMEMR#
A6 VID_CLK
C5 PIXEL11
E4 VSS
A7 PIXEL12
C6 HSYNC
E23 VSS
A8 PIXEL16
C7 PIXEL14
E24 AD20
A9 PIXEL19
C8 PIXEL17
E25 AD23
C9 PIXEL21
E26 STOP#
A10 DCLK
D26 C/BE3#
E1 FP_HSYNC_OUT
SMEMW#
A11 VID_DATA0
C10 PIXEL23
F1 FP_DATA9
A12 VID_DATA5
C11 VID_DATA3
F2 FP_DISP_ENA_OUT No Function
A13 PCLK
C12 VID_DATA7
F3 FP_DATA17
A14 INTA#
C13 VID_DATA1
F4 VDD
A15 AD0
C14 PCI_RST#
F23 VSS
A16 AD7
C15 INTC#
F24 VDD
A17 AD9
C16 AD2
F25 AD24
A18 AD12
C17 AD4
F26 AD27
A19 AD10
C18 VSS
G1 FP_DATA8
SA8
A20 AD15
C19 VDD
G2 FP_DATA5
SA5
A21 PAR
C20 AD13
G3 FP_DATA7
SA7
A22 SERR#
C21 VSS
G4 FP_DATA6
SA6
A23 DEVSEL#
C22 LOCK#
G23 VSS
A24 C/BE2#
C23 FRAME#
G24 AD25
A25 AD17
C24 VDD
G25 AD28
A26 AD16
C25 AD21
G26 AD29
MASTER#
H1 FP_DATA4
SA4
H2 FP_DATA15
SA15
D2 NC
H3 FP_DATA16
SA_OE#
D3 TEST
H4 VSS
B5 VSYNC
D4 VSS
H23 VSS
B6 PIXEL8
D5 PIXEL6
H24 VDD
B7 VID_VAL
D6 PIXEL9
H25 AD31
B8 PIXEL15
D7 PIXEL13
H26 HOLD_REQ#
B9 PIXEL18
D8 VSS
J1 FP_DATA3
SA3
D9 PIXEL20
J2 FP_DATA1
SA1
B1 ENA_DISP
C26 AD22
SA9
B2 TVCLK
D1 FP_DATA11
B3 PIXEL4
B4 PIXEL5
B10 VID_RDY
SA11
B11 PIXEL22
D10 VDD
J3 FP_DATA2
SA2
B12 VID_DATA6
D11 VID_DATA4
J4 FP_ENA_BKL
No Function
B13 VID_DATA2
D12 VSS
J23 VSS
B14 INTD#
D13 VSS
J24 AD30
B15 AD3
D14 AD1
J25 REQ#
B16 AD5
D15 INTB#
J26 PCICLK
B17 AD6
D16 VSS
K1 FP_DATA14
B18 C/BE0#
D17 VDD
K2 FP_DATA13
SA13
B19 AD11
D18 AD8
K3 FP_DATA0
SA0
B20 AD14
D19 VSS
K4 VSS
B21 C/BE1#
D20 VSS
K23 VSS
B22 PERR#
D21 VDD
K24 POR#
B23 TRDY#
D22 VSS
K25 CPU_RST
B24 IRDY#
D23 VSS
K26 SUSP#
B25 AD18
D24 GNT#
Revision 4.1
L1 FP_DATA12
15
SA14
SA12
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Geode™ CS5530
Signal Definitions (Continued)
Geode™ CS5530
Signal Definitions (Continued)
Table 2-2.
352 TBGA Pin Assignments - Sorted by Pin Number (Continued)
Signal Name
Pin
No.
Limited
ISA Mode
ISA Master
Mode
Signal Name
Pin
No.
Limited
ISA Mode
ISA Master
Mode
Signal Name
Pin
No.
Limited
ISA Mode
L2 FP_ENA_VDD
No Function
U23 IDE_DATA7
L3 FP_CLK_EVEN
No Function
U24 IDE_DATA6
AC9 VSS
L4 VDD
U25 IDE_ADDR0
AC10 VDD
L23 VDD
U26 IDE_ADDR1
AC11 IOW#
AC8 DACK1#
L24 SUSP_3V
V1 SDATA_OUT
AC12 VSS
L25 SUSPA#
V2 BIT_CLK
AC13 VSS
L26 PSERIAL
V3 PC_BEEP
AC14 IRQ3
V4 POWER_EN
AC15 MEMCS16#
M1 FP_CLK
No Function
ISA Master
Mode
M2 DDC_SCL
V23 VSS
AC16 VSS
M3 VSS
V24 IDE_DATA8
AC17 IRQ14
M4 DDC_SDA
V25 IDE_DATA10
AC18 VSS
M23 PLLDVD
V26 IDE_CS0#
AC19 VDD
M24 VSS
W1 USBCLK
AC20 SA10/SD10
SD10
M25 PLLVAA
W2 NC
AC21 GPIO5/SA21
SA21
M26 PLLRO
W3 OVER_CUR#
AC22 GPIO0
N1 HSYNC_OUT
W4 VSS
AC23 VSS
N2 VSYNC_OUT
W23 VSS
AC24 IDE_DREQ1
N3 VSS
W24 IDE_ADDR2
AC25 IDE_DATA14
N4 AVDD3 (DAC)
W25 IDE_RST#
AC26 IDE_DATA0
N23 PLLLP
W26 IDE_DATA5
AD1 NC
N24 PLLAGS
Y1 D–_PORT1
AD2 NC
N25 PLLAGD
Y2 D+_PORT1
AD3 NC
N26 PLLDGN
Y3 NC
AD4 SMEMR#/RTCALE
P1 AVSS4 (ICAP)
Y4 VSS
AD5 SA5/SD5
P2 AVSS5 (DAC)
Y23 VDD
AD6 ISACLK
P3 IOUTR
Y24 IDE_DATA11
AD7 DACK6#
P4 IOUTG
Y25 IDE_DATA9
AD8 DACK0#
P23 VSS
Y26 IDE_CS1#
P24 CLK_14MHZ
AA1 D–_PORT2
AD10 SA19
P25 SMI#
AA2 D+_PORT2
AD11 SA16
P26 INTR
AA3 NC
AD12 DRQ1
AA4 VSS
AD13 DRQ3
R2 AVSS1 (DAC)
AA23 VSS
AD14 IRQ7
R3 IREF
AA24 IDE_DATA1
AD15 SA_LATCH
R4 AVSS2 (ICAP)
AA25 IDE_DATA12
AD16 VDD
AA26 IDE_DATA4
AD17 IRQ15
R1 IOUTB
R23 IRQ13
AD9 SA2/SD2
R24 IDE_IOW0#
AB1 NC
AD18 DRQ5
R25 IDE_IOR1#
AB2 NC
AD19 SA9/SD9
R26 IDE_IOR0#
AB3 NC
AD20 VSS
AB4 VDD
AD21 GPORT_CS#
T1 VREF
T2 EXTVREFIN
AB23 IDE_DATA15
AD22 GPIO4/SA20
T3 AVDD2 (VREF)
AB24 IDE_DATA2
AD23 VDD
T4 AVSS3 (VREF)
AB25 IDE_DATA13
AD24 SA14/SD14
AB26 IDE_DATA3
AD25 IDE_IORDY0
T23 VDD
T24 IDE_DACK1#
AC1 NC
T25 IDE_IOW1#
AC2 NC
AE1 NC
T26 IDE_DACK0#
AC3 NC
AE2 NC
U1 AVDD1 (DAC)
AC4 VSS
AE3 CLK_32K
U2 VDD
AC5 VSS
U3 SYNC
AC6 SA3/SD3
U4 SDATA_IN
AC7 DACK7#
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SD5
SD2
SA_DIR
SD9
SA20
SD14
AD26 IDE_DREQ0
AE4 KBROMCS#
SD3
AE5 IRQ9
AE6 SA1/SD1
16
SD1
Revision 4.1
Table 2-2.
352 TBGA Pin Assignments - Sorted by Pin Number (Continued)
Signal Name
Pin
No.
Limited
ISA Mode
ISA Master
Mode
Pin
No.
Limited
ISA Mode
AE7 DACK5#
AE23 GPIO6/SA22
AE8 AEN
AE24 GPIO1/SDATA_IN2
AE9 SA0/SD0
SD0
AE10 DRQ2
Signal Name
Signal Name
ISA Master
Mode
SD22
AE25 SA15/SD15
Pin
No.
Limited
ISA Mode
AF13 IRQ1
AF14 IRQ6
SD15
AE26 IDE_IORDY1
AF15 TC
AF16 IOCS16#
AE11 SA18
AF1 NC
AF17 IRQ12
AE12 IOR#
AF2 NC
AF18 IRQ11
AE13 IRQ5
AF3 SMEMW#/RTCCS#
AE14 IRQ8#
AF4 SA7/SD7
SD7
AF20 MEMW#
AE15 IRQ4
AF5 SA6/SD6
SD6
AF21 SA11/SD11
AE16 IRQ10
AF6 SA4/SD4
SD4
AF22 DRQ7
AE17 SBHE#
AF7 DACK3#
AF23 GPIO7/SA23
AE18 DRQ0
AF8 DACK2#
AF24 GPIO3
AF9 BALE
AF25 GPIO2
AE19 MEMR#
AE20 DRQ6
AF10 ZEROWS#
AE21 SA12/SD12
SD12
AF11 IOCHRDY
AE22 SA13/SD13
SD13
AF12 SA17
Revision 4.1
ISA Master
Mode
AF19 SA8/SD8
SD8
SD11
SA23
AF26 GPCS#
17
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Geode™ CS5530
Signal Definitions (Continued)
Geode™ CS5530
Signal Definitions (Continued)
Table 2-3. 352 TBGA Pin Assignments - Sorted Alphabetically by Signal Name
Signal Name
Limited ISA
Mode
ISA Master
Mode
Signal Name
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
Limited ISA
Mode
ISA Master
Mode
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
AD0
I/O, t/s, 5VT
PCI
A15
DACK1#
O
8 mA
AC8
AD1
I/O, t/s, 5VT
PCI
D14
DACK2#
O
8 mA
AF8
AD2
I/O, t/s, 5VT
PCI
C16
DACK3#
O
8 mA
AF7
AD3
I/O, t/s, 5VT
PCI
B15
DACK5#
O
8 mA
AE7
AD4
I/O, t/s, 5VT
PCI
C17
DACK6#
O
8 mA
AD7
AD5
I/O, t/s, 5VT
PCI
B16
DACK7#
O
8 mA
AC7
AD6
I/O, t/s, 5VT
PCI
B17
DCLK
O
8 mA
A10
AD7
I/O, t/s, 5VT
PCI
A16
DDC_SCL
O
8 mA
M2
AD8
I/O, t/s, 5VT
PCI
D18
DDC_SDA
I/O, 5VT
8 mA
M4
AD9
I/O, t/s, 5VT
PCI
A17
DEVSEL#
I/O, t/s, 5VT
PCI
A23
AD10
I/O, t/s, 5VT
PCI
A19
D–_PORT1
I/O
USB
Y1
AD11
I/O, t/s, 5VT
PCI
B19
D+_PORT1
I/O
USB
Y2
AD12
I/O, t/s, 5VT
PCI
A18
D–_PORT2
I/O
USB
AA1
AD13
I/O, t/s, 5VT
PCI
C20
D+_PORT2
I/O
USB
AA2
AD14
I/O, t/s, 5VT
PCI
B20
DRQ0
I, 5VT
IBUF
AE18
AD15
I/O, t/s, 5VT
PCI
A20
DRQ1
I, 5VT
IBUF
AD12
AD16
I/O, t/s, 5VT
PCI
A26
DRQ2
I, 5VT
IBUF
AE10
AD17
I/O, t/s, 5VT
PCI
A25
DRQ3
I, 5VT
IBUF
AD13
AD18
I/O, t/s, 5VT
PCI
B25
DRQ5
I, 5VT
IBUF
AD18
AD19
I/O, t/s, 5VT
PCI
B26
DRQ6
I, 5VT
IBUF
AE20
AD20
I/O, t/s, 5VT
PCI
E24
DRQ7
I, 5VT
IBUF
AF22
AD21
I/O, t/s, 5VT
PCI
C25
ENA_DISP
I
IBUF
B1
AD22
I/O, t/s, 5VT
PCI
C26
EXTVREFIN
I, Analog
--
T2
AD23
I/O, t/s, 5VT
PCI
E25
FP_CLK
O
8 mA
M1
AD24
I/O, t/s, 5VT
PCI
F25
FP_CLK_EVEN
No Function
O
8 mA
L3
AD25
I/O, t/s, 5VT
PCI
G24
FP_DATA0
SA0
I/O
8 mA
K3
AD26
I/O, t/s, 5VT
PCI
D25
FP_DATA1
SA1
I/O
8 mA
J2
AD27
I/O, t/s, 5VT
PCI
F26
FP_DATA2
SA2
I/O
8 mA
J3
AD28
I/O, t/s, 5VT
PCI
G25
FP_DATA3
SA3
I/O
8 mA
J1
AD29
I/O, t/s, 5VT
PCI
G26
FP_DATA4
SA4
I/O
8 mA
H1
AD30
I/O, t/s, 5VT
PCI
J24
FP_DATA5
SA5
I/O
8 mA
G2
AD31
I/O, t/s, 5VT
PCI
H25
FP_DATA6
SA6
I/O
8 mA
G4
AEN
O
8 mA
AE8
FP_DATA7
SA7
I/O
8 mA
G3
AVDD1 (DAC)
I, Analog
--
U1
FP_DATA8
SA8
I/O
8 mA
G1
AVDD2 (VREF)
I, Analog
--
T3
FP_DATA9
SA9
I/O
8 mA
F1
AVDD3 (DAC)
I, Analog
--
N4
FP_DATA10
SA10
I/O
8 mA
E2
AVSS1 (DAC)
I, Analog
--
R2
FP_DATA11
SA11
I/O
8 mA
D1
AVSS2 (ICAP)
I, Analog
--
R4
FP_DATA12
SA12
I/O
8 mA
L1
AVSS3 (VREF)
I, Analog
--
T4
FP_DATA13
SA13
I/O
8 mA
K2
AVSS4 (ICAP)
I, Analog
--
P1
FP_DATA14
SA14
I/O
8 mA
K1
AVSS5 (DAC)
I, Analog
--
P2
FP_DATA15
SA15
I/O
8 mA
H2
H3
No Function
O
8 mA
AF9
FP_DATA16
SA_OE#
O
8 mA
I, 5VT
IBUF
V2
FP_DATA17
MASTER#
I/O
8 mA
F3
C/BE0#
I/O, t/s, 5VT
PCI
B18
FP_DISP_ENA_OUT
No Function
O
8 mA
F2
C/BE1#
I/O, t/s, 5VT
PCI
B21
FP_ENA_BKL
No Function
O
8 mA
J4
C/BE2#
I/O, t/s, 5VT
PCI
A24
FP_ENA_VDD
No Function
O
8 mA
L2
C/BE3#
I/O, t/s, 5VT
PCI
D26
FP_HSYNC
No Function
I
IBUF
C2
I
smt
P24
FP_HSYNC_OUT
SMEMW#
O
8 mA
E1
CLK_32K
I/O, 5VT
4 mA
AE3
FP_VSYNC
No Function
I
IBUF
C1
CPU_RST
O
8 mA
K25
FP_VSYNC_OUT
SMEMR#
O
8 mA
E3
DACK0#
O
8 mA
AD8
FRAME#
I/O, t/s, 5VT
PCI
C23
BALE
BIT_CLK
CLK_14MHZ
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18
Revision 4.1
Table 2-3.
352 TBGA Pin Assignments - Sorted Alphabetically by Signal Name (Continued)
Signal Name
Limited ISA
Mode
ISA Master
Mode
Signal Name
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
Limited ISA
Mode
ISA Master
Mode
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
I, 5VT
PCI
D24
IOCHRDY
I/O, OD, 5VT
8 mA
AF11
GPCS#
O
4 mA
AF26
IOCS16#
I, 5VT
IBUF
AF16
GPIO0
I/O, 5VT
8 mA
AC22
IOR#
I/O (PU), 5VT
8 mA
AE12
GPIO1/SDATA_IN2
I/O, 5VT
8 mA
AE24
IOUTB
O, Analog
R1
GPIO2
I/O, 5VT
8 mA
AF25
IOUTR
O, Analog
P3
GPIO3
I/O, 5VT
8 mA
AF24
IOUTG
O, Analog
8 mA
AD22
IOW#
I/O (PU), 5VT
8 mA
AC11
PCI
B24
IBUF
AF13
GNT#
GPIO4/SA20
SA20
I/O, 5VT
GPIO5/SA21
SA21
I/O, 5VT
8 mA
AC21
IRDY#
I/O, t/s, 5VT
GPIO6/SA22
SA22
I/O, 5VT
8 mA
AE23
IREF
I, Analog
GPIO7/SA23
SA23
I/O, 5VT
8 mA
AF23
IRQ1
I, 5VT
P4
R3
O
8 mA
AD21
IRQ3
I, 5VT
IBUF
AC14
I/O, 5VT
PCI
H26
IRQ4
I, 5VT
IBUF
AE15
HSYNC
I
IBUF
C6
IRQ5
I, 5VT
IBUF
AE13
HSYNC_OUT
O
16 mA
N1
IRQ6
I, 5VT
IBUF
AF14
IDE_ADDR0
O
8 mA
U25
IRQ7
I, 5VT
IBUF
AD14
IDE_ADDR1
O
8 mA
U26
IRQ8#
I, 5VT
IBUF
AE14
IDE_ADDR2
O
8 mA
W24
IRQ9
I, 5VT
IBUF
AE5
IDE_CS0#
O
8 mA
V26
IRQ10
I, 5VT
IBUF
AE16
IDE_CS1#
O
8 mA
Y26
IRQ11
I, 5VT
IBUF
AF18
IDE_DACK0#
O
8 mA
T26
IRQ12
I, 5VT
IBUF
AF17
IDE_DACK1#
O
8 mA
T24
IRQ13
I, 5VT
IBUF
R23
IDE_DATA0
I/O, 5VT
8 mA
AC26
IRQ14
I, 5VT
IBUF
AC17
IDE_DATA1
I/O, 5VT
8 mA
AA24
IRQ15
I, 5VT
IBUF
AD17
IDE_DATA2
I/O, 5VT
8 mA
AB24
ISACLK
O
16 mA
AD6
IDE_DATA3
I/O, 5VT
8 mA
AB26
KBROMCS#
O
4 mA
AE4
IDE_DATA4
I/O, 5VT
8 mA
AA26
LOCK#
I/O, t/s, 5VT
PCI
C22
IDE_DATA5
I/O, 5VT
8 mA
W26
MEMCS16#
I/O, OD, 5VT
8 mA
AC15
IDE_DATA6
I/O, 5VT
8 mA
U24
MEMR#
I/O (PU), 5VT
8 mA
AE19
IDE_DATA7
I/O, 5VT
8 mA
U23
MEMW#
I/O (PU), 5VT
8 mA
AF20
IDE_DATA8
I/O, 5VT
8 mA
V24
NC
--
--
AA3
IDE_DATA9
I/O, 5VT
8 mA
Y25
NC
--
--
AB1
IDE_DATA10
I/O, 5VT
8 mA
V25
NC
--
--
AB2
IDE_DATA11
I/O, 5VT
8 mA
Y24
NC
--
--
AB3
IDE_DATA12
I/O, 5VT
8 mA
AA25
NC
--
--
AC1
IDE_DATA13
I/O, 5VT
8 mA
AB25
NC
--
--
AC2
IDE_DATA14
I/O, 5VT
8 mA
AC25
NC
--
--
AC3
IDE_DATA15
I/O, 5VT
8 mA
AB23
NC
--
--
AD1
IDE_DREQ0
I, 5VT
IBUF
AD26
NC
--
--
AD2
IDE_DREQ1
I, 5VT
IBUF
AC24
NC
--
--
AD3
IDE_IOR0#
O
8 mA
R26
NC
--
--
AE1
IDE_IOR1#
O
8 mA
R25
NC
--
--
AE2
IDE_IORDY0
I, 5VT
IBUF
AD25
NC
--
--
AF1
IDE_IORDY1
I, 5VT
IBUF
AE26
NC
--
--
AF2
IDE_IOW0#
O
8 mA
R24
NC
--
--
D2
IDE_IOW1#
O
8 mA
T25
NC
--
--
W2
GPORT_CS#
HOLD_REQ# (strap pin)
O
8 mA
W25
NC
INTA#
I, 5VT
IBUF
A14
OVER_CUR#
INTB#
I, 5VT
IBUF
D15
PAR
INTC#
I, 5VT
IBUF
C15
PC_BEEP
INTD#
I, 5VT
IBUF
B14
I/O
4 mA
P26
IDE_RST#
INTR (strap pin)
Revision 4.1
19
--
--
Y3
I, 5VT
IBUF
W3
I/O, t/s, 5VT
PCI
A21
O
4 mA
V3
PCICLK
I
smt
J26
PCI_RST#
O
16 mA
C14
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Geode™ CS5530
Signal Definitions (Continued)
Geode™ CS5530
Signal Definitions (Continued)
Table 2-3.
352 TBGA Pin Assignments - Sorted Alphabetically by Signal Name (Continued)
Signal Name
Limited ISA
Mode
ISA Master
Mode
Signal Name
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
Limited ISA
Mode
ISA Master
Mode
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
I
smt
A13
SA14/SD14
SD14
I/O (PU), 5VT
8 mA
AD24
PERR#
I/O, t/s, 5VT
PCI
B22
SA15/SD15
SD15
I/O (PU), 5VT
8 mA
AE25
PIXEL0
I
IBUF
A1
SA16
I/O (PU), 5VT
8 mA
AD11
PIXEL1
I
IBUF
A2
SA17
I/O (PU), 5VT
8 mA
AF12
PIXEL2
I
IBUF
A3
SA18
I/O (PU), 5VT
8 mA
AE11
PIXEL3
I
IBUF
C4
SA19
I/O (PU), 5VT
8 mA
AD10
PIXEL4
I
IBUF
B3
SA_LATCH
PIXEL5
I
IBUF
B4
SBHE#
PIXEL6
I
IBUF
D5
SDATA_IN
PIXEL7
I
IBUF
A4
SDATA_OUT
PIXEL8
I
IBUF
B6
SERR#
PIXEL9
I
IBUF
D6
PIXEL10
I
IBUF
A5
PIXEL11
I
IBUF
PIXEL12
I
PIXEL13
PIXEL14
PCLK
O
4 mA
AD15
I/O (PU), 5VT
8 mA
AE17
I, 5VT
IBUF
U4
O
4 mA
V1
I/O, OD, 5VT
PCI
A22
SMEMR#/RTCALE
O
4 mA
AD4
SMEMW#/RTCCS#
O
4 mA
AF3
C5
SMI#
I/O
4 mA
P25
IBUF
A7
STOP#
I/O, t/s, 5VT
PCI
E26
I
IBUF
D7
SUSP#
O
4 mA
K26
I
IBUF
C7
SUSPA#
I
IBUF
L25
PIXEL15
I
IBUF
B8
SUSP_3V
I/O
4 mA
L24
PIXEL16
I
IBUF
A8
SYNC
O
4 mA
U3
PIXEL17
I
IBUF
C8
TC
O
8 mA
AF15
PIXEL18
I
IBUF
B9
TEST
I
IBUF
D3
PIXEL19
I
IBUF
A9
TRDY#
I/O, t/s, 5VT
PCI
B23
PIXEL20
I
IBUF
D9
TVCLK
I, 5VT
4 mA
B2
PIXEL21
I
IBUF
C9
USBCLK
I
smt
W1
PIXEL22
I
IBUF
B11
VDD
PWR
--
D10
PIXEL23
I
IBUF
C10
VDD
PWR
--
D17
PLLAGD
I, Analog
--
N25
VDD
PWR
--
AB4
PLLAGS
I, Analog
--
N24
VDD
PWR
--
AC10
PLLDGN
I, Analog
--
N26
VDD
PWR
--
AC19
PLLDVD
I, Analog
--
M23
VDD
PWR
--
AD16
PLLLP
I, Analog
--
N23
VDD
PWR
--
AD23
PLLRO
I, Analog
--
M26
VDD
PWR
--
C19
PLLVAA
I, Analog
--
M25
VDD
PWR
--
C24
POR#
I
IBUF
K24
VDD
PWR
--
C3
POWER_EN
O
4 mA
V4
VDD
PWR
--
D21
F24
PSERIAL
REQ#
SA_DIR
I
IBUF
L26
VDD
PWR
--
O, 5VT
PCI
J25
VDD
PWR
--
F4
AE9
VDD
PWR
--
H24
L23
SA0/SD0
SD0
I/O (PU), 5VT
8 mA
SA1/SD1
SD1
I/O (PU), 5VT
8 mA
AE6
VDD
PWR
--
SA2/SD2
SD2
I/O (PU), 5VT
8 mA
AD9
VDD
PWR
--
L4
SA3/SD3
SD3
I/O (PU), 5VT
8 mA
AC6
VDD
PWR
--
T23
SA4/SD4
SD4
I/O (PU), 5VT
8 mA
AF6
VDD
PWR
--
U2
SA5/SD5
SD5
I/O (PU), 5VT
8 mA
AD5
VDD
PWR
--
Y23
SA6/SD6
SD6
I/O (PU), 5VT
8 mA
AF5
VID_CLK
I
smt
A6
SA7/SD7
SD7
I/O (PU), 5VT
8 mA
AF4
VID_DATA0
I
IBUF
A11
SA8/SD8
SD8
I/O (PU), 5VT
8 mA
AF19
VID_DATA1
I
IBUF
C13
SA9/SD9
SD9
I/O (PU), 5VT
8 mA
AD19
VID_DATA2
I
IBUF
B13
SA10/SD10
SD10
I/O (PU), 5VT
8 mA
AC20
VID_DATA3
I
IBUF
C11
SA11/SD11
SD11
I/O (PU), 5VT
8 mA
AF21
VID_DATA4
I
IBUF
D11
SA12/SD12
SD12
I/O (PU), 5VT
8 mA
AE21
VID_DATA5
I
IBUF
A12
SA13/SD13
SD13
I/O (PU), 5VT
8 mA
AE22
VID_DATA6
I
IBUF
B12
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20
Revision 4.1
Table 2-3.
352 TBGA Pin Assignments - Sorted Alphabetically by Signal Name (Continued)
Signal Name
Limited ISA
Mode
ISA Master
Mode
Signal Name
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
Limited ISA
Mode
ISA Master
Mode
Pin Type
(Note 1)
Buffer
Type
(Note 2)
Pin
No.
H23
VID_DATA7
I
IBUF
C12
VSS
GND
--
VID_RDY
O
8 mA
B10
VSS
GND
--
H4
VID_VAL
I
IBUF
B7
VSS
GND
--
J23
K23
I, Analog
--
T1
VSS
GND
--
VSS
GND
--
D12
VSS
GND
--
K4
VSS
GND
--
D13
VSS
GND
--
M24
VSS
GND
--
D16
VSS
GND
--
M3
VSS
GND
--
AA23
VSS
GND
--
N3
VSS
GND
--
AA4
VSS
GND
--
P23
VSS
GND
--
AC12
VSS
GND
--
V23
VSS
GND
--
AC13
VSS
GND
--
W23
VSS
GND
--
AC16
VSS
GND
--
W4
VSS
GND
--
AC18
VSS
GND
--
Y4
VSS
GND
--
AC23
VSYNC
I
IBUF
B5
VSS
GND
--
AC4
VSYNC_OUT
O
16 mA
N2
VSS
GND
--
AC5
ZEROWS#
I, 5VT
IBUF
AF10
VSS
GND
--
AC9
VSS
GND
--
AD20
VSS
GND
--
C18
VSS
GND
--
C21
VSS
GND
--
D19
VSS
GND
--
D20
VSS
GND
--
D22
VSS
GND
--
D23
VSS
GND
--
D4
VSS
GND
--
D8
VSS
GND
--
E23
VSS
GND
--
E4
VSS
GND
--
F23
VSS
GND
--
G23
VREF
Revision 4.1
Notes: 1) See Table 2-1 on page 13 for pin type definitions.
2) See Table 5-6 "DC Characteristics (at Recommended
Operating Conditions)" on page 228 for more information. IBUF refers to input buffer.
21
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Geode™ CS5530
Signal Definitions (Continued)
Geode™ CS5530
Signal Definitions (Continued)
2.2
SIGNAL DESCRIPTIONS
2.2.1
Reset Interface
Signal Name
Pin
No.
Type
PCI_RST#
C14
O
Description
PCI Reset
PCI_RST# resets the PCI bus and is asserted while POR# is asserted,
and for approximately 9 ms following the deassertion of POR#.
POR#
K24
CPU_RST
K25
I
smt
O
Power On Reset
POR# is the system reset signal generated from the power supply to indicate that the system should be reset.
CPU Reset
CPU_RST resets the CPU and is asserted while POR# is asserted, and
for approximately 9 ms following the deassertion of POR#.
2.2.2
Clock Interface
Signal Name
Pin
No.
Type
PCICLK
J26
I
Description
PCI Clock
The PCI clock is used to drive most circuitry of the CS5530.
TVCLK
DCLK
B2
A10
I
5VT
O
Television Clock
The TVCLK is an input from a digital NTSC/PAL converter which is optionally re-driven back out onto the DCLK signal under software program control. This is only used if interfacing to a compatible digital NTSC/PAL
encoder device.
DOT Clock
DOT clock is generated by the CS5530 and typically connects to the processor to create the video pixel clock. The minimum frequency of DCLK is
10 MHz and the maximum is 200 MHz.
ISACLK
AD6
O
ISA Bus Clock
ISACLK is derived from PCICLK and is typically programmed for approximately 8 MHz. F0 Index 50h[2:0] is used to program the ISA clock divisor.
CLK_14MHZ
P24
I
14.31818 MHz Clock
DOT clock (DCLK) is derived from this clock.
USBCLK
W1
I
USBCLK
This input is used as the clock source for the USB. In this mode, a 48 MHz
clock source input is required.
CLK_32K
AE3
I/O
5VT
32KHz Clock
CLK_32K is a 32.768 KHz clock used to generate reset signals, as well as
to maintain power management functionality. It should be active when
power is applied to the CS5530.
CLK_32K can be an input or an output. As an output CLK_32K is internally derived from CLK_14MHZ. F0 Index 44h[5:4] are used to program
this pin.
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22
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.3
CPU Interface
Signal Name
INTR
Pin
No.
P26
Strap
Option
Pin
Type
O
Description
CPU Interrupt Request
INTR is the level output from the integrated 8259 PICs and is asserted if
an unmasked interrupt request (IRQn) is sampled active.
I
Strap Option Select Pin
Pin P26 is a strap option select pin. It is used to select whether the
CS5530 operates in Limited ISA or ISA Master mode.
ISA Limited Mode—Strap pin P26 low through a 10-kohm resistor.
ISA Master Mode—Strap pin P26 high through a 10-kohm resistor.
SMI#
P25
I/O
System Management Interrupt
SMI# is a level-sensitive interrupt to the CPU that can be configured to
assert on a number of different system events. After an SMI# assertion,
System Management Mode (SMM) is entered, and program execution
begins at the base of SMM address space.
Once asserted, SMI# remains active until all SMI sources are cleared.
IRQ13
PSERIAL
R23
L26
I
5VT
I
IRQ13
IRQ13 is an input from the processor indicating that a floating point error
was detected and that INTR should be asserted.
Power Management Serial Interface
PSERIAL is the unidirectional serial data link between the GXLV processor and the CS5530. An 8-bit serial data packet carries status on power
management events within the CPU. Data is clocked synchronous to the
PCICLK input clock.
SUSP#
K26
O
CPU Suspend
SUSP# asserted requests that the processor enter Suspend mode and
assert SUSPA# after completion. The SUSP# pin is deasserted after
detecting any Speedup or Resume event. If the SUSP#/SUSPA# handshake is configured as a system 3 Volt Suspend, the deassertion of
SUSP# is delayed to allow the system clock chip and the processor to stabilize.
The SUSP#/SUSPA# handshake occurs as a result of a write to the Suspend Notebook Command Register (F0 Index AFh), or an expiration of the
Suspend Modulation OFF Count Register (F0 Index 94h) when Suspend
Modulation is enabled. Suspend Modulation is enabled via F0 Index
96h[0].
SUSPA#
L25
I
CPU Suspend Acknowledge
SUSPA# is a level input from the processor. When asserted it indicates
the CPU is in Suspend mode as a result of SUSP# assertion or execution
of a HALT instruction.
Revision 4.1
23
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Geode™ CS5530
Signal Definitions (Continued)
2.2.3
CPU Interface (Continued)
Signal Name
Pin
No.
Type
SUSP_3V
L24
I/O
Description
Suspend 3 Volt Active
SUSP_3V can be connected to the output enable (OE) of a clock synthesis or buffer chip to stop the clocks to the system. SUSP_3V is asserted
on any write to Suspend Notebook Command Register (F0 Index AFh)
with bit 0 set in the Clock Stop Control Register (F0 Index BCh).
SUSP_3V is only asserted after the SUSP#/SUSPA# handshake.
As an input, SUSP_3V is sampled during power-on-reset to determine the
inactive state. This allows the system designer to match the active state of
SUSP_3V to the inactive state for a clock driver output enabled with a pullup/down 10-kohm resistor. If pulled down, SUSP_3V is active high. If
pulled up, SUSP_3V is active low.
2.2.4
PCI Interface
Signal Name
AD[31:0]
Pin
No.
Type
Description
Refer
to Table
2-3
I/O
t/s
5VT
PCI Address/Data
AD[31:0] is a physical address during the first clock of a PCI transaction; it
is the data during subsequent clocks.
When the CS5530 is a PCI master, AD[31:0] are outputs during the
address and write data phases, and are inputs during the read data phase
of a transaction.
When the CS5530 is a PCI slave, AD[31:0] are inputs during the address
and write data phases, and are outputs during the read data phase of a
transaction.
C/BE[3:0]#
D26,
A24,
B21,
B18
I/O
t/s
5VT
PCI Bus Command and Byte Enables
During the address phase of a PCI transaction, C/BE[3:0]# defines the
bus command. During the data phase of a transaction, C/BE[3:0]# are the
data byte enables.
C/BE[3:0]# are outputs when the CS5530 is a PCI master and are inputs
when it is a PCI slave.
INTA#,
INTB#,
INTC#,
INTD#
A14,
D15,
C15,
B14
I
5VT
PCI Interrupt Pins
The CS5530 provides inputs for the optional “level-sensitive” PCI interrupts (also known in industry terms as PIRQx#). These interrupts may be
mapped to IRQs of the internal 8259s using PCI Interrupt Steering Registers 1 and 2 (F0 Index 5Ch and 5Dh).
The USB controller uses INTA# as its output signal. Refer to PCIUSB
Index 3Dh.
REQ#
J25
O
5VT
PCI Bus Request
The CS5530 asserts REQ# in response to a DMA request or ISA master
request to gain ownership of the PCI bus. The REQ# and GNT# signals
are used to arbitrate for the PCI bus.
REQ# should connect to the REQ0# of the GXLV processor and function
as the highest-priority PCI master.
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24
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.4
PCI Interface (Continued)
Signal Name
Pin
No.
GNT#
D24
Type
Description
I
5VT
PCI Bus Grant
GNT# is asserted by an arbiter that indicates to the CS5530 that access
to the PCI bus has been granted.
GNT# should connect to GNT0# of the GXLV processor and function as
the highest-priority PCI master.
HOLD_REQ#
H26
Strap
Option
Pin
O
PCI Bus Hold Request
This pin’s function as HOLD_REQ# is no longer applicable.
I
5VT
Strap Option Select Pin
Pin H26 is a strap option select pin. It allows selection of which address
bits are used as the IDSEL.
Strap pin H26 low: IDSEL = AD28 (Chipset Register Space) and AD29
(USB Register Space)
Strap pin H26 high: IDSEL = AD26 (Chipset Register Space) and AD27
(USB Register Space)
FRAME#
C23
I/O
t/s
5VT
PCI Cycle Frame
FRAME# is asserted to indicate the start and duration of a transaction. It
is deasserted on the final data phase.
FRAME# is an input when the CS5530 is a PCI slave.
IRDY#
B24
I/O
t/s
5VT
PCI Initiator Ready
IRDY# is driven by the master to indicate valid data on a write transaction,
or that it is ready to receive data on a read transaction.
When the CS5530 is a PCI slave, IRDY# is an input that can delay the
beginning of a write transaction or the completion of a read transaction.
Wait cycles are inserted until both IRDY# and TRDY# are asserted
together.
TRDY#
B23
I/O
t/s
5VT
PCI Target Ready
TRDY# is asserted by a PCI slave to indicate it is ready to complete the
current data transfer.
TRDY# is an input that indicates a PCI slave has driven valid data on a
read or a PCI slave is ready to accept data from the CS5530 on a write.
TRDY# is an output that indicates the CS5530 has placed valid data on
AD[31:0] during a read or is ready to accept the data from a PCI master
on a write.
Wait cycles are inserted until both IRDY# and TRDY# are asserted
together.
STOP#
E26
I/O
t/s
5VT
PCI Stop
As an input, STOP# indicates that a PCI slave wants to terminate the current transfer. The transfer will either be aborted or retried. STOP# is also
used to end a burst.
As an output, STOP# is asserted with TRDY# to indicate a target disconnect, or without TRDY# to indicate a target retry. The CS5530 will assert
STOP# during any cache line crossings if in single transfer DMA mode or
if busy.
Revision 4.1
25
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Geode™ CS5530
Signal Definitions (Continued)
2.2.4
PCI Interface (Continued)
Signal Name
Pin
No.
LOCK#
C22
Type
Description
I/O
t/s
5VT
PCI Lock
LOCK# indicates an atomic operation that may require multiple transactions to complete.
If the CS5530 is currently the target of a LOCKed transaction, any other
PCI master request with the CS5530 as the target is forced to retry the
transfer.
The CS5530 does not generate LOCKed transactions.
DEVSEL#
A23
I/O
t/s
5VT
PCI Device Select
DEVSEL# is asserted by a PCI slave, to indicate to a PCI master and subtractive decoder that it is the target of the current transaction.
As an input, DEVSEL# indicates a PCI slave has responded to the current
address.
As an output, DEVSEL# is asserted one cycle after the assertion of
FRAME# and remains asserted to the end of a transaction as the result of
a positive decode. DEVSEL# is asserted four cycles after the assertion of
FRAME# if DEVSEL# has not been asserted by another PCI device when
the CS5530 is programmed to be the subtractive decode agent. The subtractive decode sample point is configured in F0 Index 41h[2:1]. Subtractive decode cycles are passed to the ISA bus.
PAR
A21
I/O
t/s
5VT
PCI Parity
PAR is the parity signal driven to maintain even parity across AD[31:0]
and C/BE[3:0]#.
The CS5530 drives PAR one clock after the address phase and one clock
after each completed data phase of write transactions as a PCI master. It
also drives PAR one clock after each completed data phase of read transactions as a PCI slave.
PERR#
B22
I/O
t/s
5VT
PCI Parity Error
PERR# is pulsed by a PCI device to indicate that a parity error was
detected. If a parity error was detected, PERR# is asserted by a PCI slave
during a write data phase and by a PCI master during a read data phase.
When the CS5530 is a PCI master, PERR# is an output during read transfers and an input during write transfers. When the CS5530 is a PCI slave,
PERR# is an input during read transfers and an output during write transfers.
Parity detection is enabled through F0 Index 04h[6]. An NMI is generated
if I/O Port 061h[2] is set. PERR# can assert SERR# if F0 Index 41h[5] is
set.
SERR#
A22
I/O
OD
5VT
PCI System Error
SERR# is pulsed by a PCI device to indicate an address parity error, data
parity error on a special cycle command, or other fatal system errors.
SERR# is an open-drain output reporting an error condition, and an input
indicating that the CS5530 should generate an NMI. As an input, SERR#
is asserted for a single clock by the slave reporting the error.
System error detection is enabled with F0 Index 04h[8]. An NMI is generated if I/O Port 061h[2] is set. PERR# can assert SERR# if F0 Index
41h[5] is set.
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26
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.5
ISA Bus Interface
Signal Name
SA_LATCH/
SA_DIR
Pin
No.
Type
AD15
O
Description
Limited ISA Mode: System Address Latch
This signal is used to latch the destination address, which is multiplexed
on bits [15:0] of the SA/SD bus.
ISA Master Mode: System Address Direction
Controls the direction of the external 5.0V tolerant transceiver on bits
[15:0] of the SA bus. When low, the SA bus is driven out. When high, the
SA bus is driven into the CS5530 by the external transceiver.
SA_OE#/
FP_DATA16
H3
O
Limited ISA Mode: Flat Panel Data Port Line 16
Refer to Section 2.2.11 “Display Interface” on page 34 for this signal’s definition.
O
ISA Master Mode: System Address Transceiver Output Enable
Enables the external transceiver on bits [15:0] of the SA bus.
MASTER#/
FP_DATA17
F3
O
Limited ISA Mode: Flat Panel Data Port Line 17
Refer to Section 2.2.11 “Display Interface” on page 34 for this signal’s definition.
I
ISA Master Mode: Master
The MASTER# input asserted indicates an ISA bus master is driving the
ISA bus.
SA23/GPIO7
AF23
SA22/GPIO6
AE23
SA21/GPIO5
AC21
SA20/GPIO4
AD22
I/O
5VT
Limited ISA Mode: System Address Bus Lines 23 through 20 or
General Purpose I/Os 7 through 4
These pins can function either as the upper four bits of the SA bus or as
general purpose I/Os. Programming is done through F0 Index 43h, bits 6
and 2.
Refer to Section 2.2.9 “Game Port and General Purpose I/O Interface” on
page 32 for further details when used as GPIOs.
ISA Master Mode: System Address Bus Lines 23 through 20
The pins function only as the four MSB (most significant bits) of the SA
bus.
SA[19:16]
SA[15:0]/SD[15:0]
AD10,
AE11,
AF12,
AD11
I/O
PU
5VT
System Address Bus Lines 19 through 16
Refer
to
Table
2-3
I/O
PU
5VT
Limited ISA Mode: System Address Bus / System Data Bus
Refer to SA[15:0] signal description.
This bus carries both the addresses and data for all ISA cycles. Initially,
the address is placed on the bus and then SA_LATCH is asserted for
external latches to latch the address. At some time later, the data is put on
the bus, for a read, or the bus direction is changed to an input, for a write.
Pins designated as SA/SD[15:0] are internally connected to a 20-kohm
pull-up resistor.
ISA Master Mode: System Data Bus
These pins perform only as SD[15:0] and pins FP_DATA[15:0] take on the
functions of SA[15:0].
Pins designated as SA/SD[15:0] are internally connected to a 20-kohm
pull-up resistor.
Revision 4.1
27
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Geode™ CS5530
Signal Definitions (Continued)
2.2.5
ISA Bus Interface (Continued)
Signal Name
SMEMW#/
FP_HSYNC_OUT
Pin
No.
Type
E1
O
Description
Limited ISA Mode: Flat Panel Horizontal Sync Output
Refer to Section 2.2.11 “Display Interface” on page 34 for this signal’s definition.
Note that if Limited ISA Mode of operation is selected, SMEMW# is available on pin AF3 (multiplexed with RTCCS#).
ISA Master Mode: System Memory Write
SMEMW# is asserted for any memory write accesses below 1 MB. It
enables 8-bit memory slaves to decode the memory address on SA[19:0].
SMEMR#/
FP_VSYNC_OUT
E3
O
Limited ISA Mode: Flat Panel Vertical Sync Output
Refer to Section 2.2.11 “Display Interface” on page 34 for this signal’s definition.
Note that if Limited ISA Mode of operation is selected, SMEMR# is available on pin AD4 (multiplexed with RTCALE).
ISA Master Mode: System Memory Read
SMEMR# is asserted for memory read accesses below 1 MB. It enables
8-bit memory slaves to decode the memory address on SA[19:0].
SMEMW#/
RTCCS#
AF3
O
System Memory Write / Real-Time Clock Chip Select
If Limited ISA Mode of operation has been selected, then SMEMW# can
be output on this pin. SMEMW# is asserted for any memory write
accesses below 1 MB. It enables 8-bit memory slaves to decode the
memory address on SA[19:0].
RTCCS# is a chip select to an external real-time clock chip. This signal is
activated on reads or writes to I/O Port 071h
Function selection is made through F0 Index 53h[2]: 0 = SMEMW#,
1 = RTCCS#.
SMEMR#/
RTCALE
AD4
O
System Memory Read / Real-Time Clock Address Latch Enable
If Limited ISA Mode of operation has been selected, then SMEMR# can
be output on this pin. SMEMR# is asserted for memory read accesses
below 1 MB. It enables 8-bit memory slaves to decode the memory
address on SA[19:0].
RTCALE is a signal telling an external real-time clock chip to latch the
address, which is on the SD bus.
Function selection is made through F0 Index 53h[2]: 0 = SMEMR#,
1 = RTCALE.
SBHE#
AE17
I/O
PU
5VT
System Bus High Enable
The CS5530 or ISA master asserts SBHE# to indicate that SD[15:8] will
be used to transfer a byte at an odd address.
SBHE# is an output during non-ISA master DMA operations. It is driven
as the inversion of AD0 during 8-bit DMA cycles. It is forced low for all 16bit DMA cycles.
SBHE# is an input during ISA master operations.
This pin is internally connected to a 20-kohm pull-up resistor.
BALE
AF9
O
Buffered Address Latch Enable
BALE indicates when SA[23:0] and SBHE# are valid and may be latched.
For DMA transfers, BALE remains asserted until the transfer is complete.
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28
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.5
ISA Bus Interface (Continued)
Signal Name
IOCHRDY
Pin
No.
AF11
Type
Description
I/O
OD
5VT
I/O Channel Ready
IOCHRDY deasserted indicates that an ISA slave requires additional wait
states.
When the CS5530 is an ISA slave, IOCHRDY is an output indicating additional wait states are required.
ZEROWS#
IOCS16#
AF10
AF16
I
5VT
Zero Wait States
I
5VT
I/O Chip Select 16
ZEROWS# asserted indicates that an ISA 8- or 16-bit memory slave can
shorten the current cycle. The CS5530 samples this signal in the phase
after BALE is asserted. If asserted, it shortens 8-bit cycles to three
ISACLKs and 16-bit cycles to two ISACLKs.
IOCS16# is asserted by 16-bit ISA I/O devices based on an asynchronous
decode of SA[15:0] to indicate that SD[15:0] will be used to transfer data.
Note:
IOR#
AE12
I/O
PU
5VT
8-bit ISA I/O devices only use SD[7:0].
I/O Read
IOR# is asserted to request an ISA I/O slave to drive data onto the data
bus.
This pin is internally connected to a 20-kohm pull-up resistor.
IOW#
AC11
I/O
PU
5VT
I/O Write
IOW# is asserted to request an ISA I/O slave to accept data from the data
bus.
This pin is internally connected to a 20-kohm pull-up resistor.
MEMCS16#
AC15
I/O
OD
5VT
Memory Chip Select 16
MEMCS16# is asserted by 16-bit ISA memory devices based on an asynchronous decode of SA[23:17] to indicate that SD[15:0] will be used to
transfer data.
Note: 8-bit ISA memory devices only use SD[7:0].
MEMR#
AE19
I/O
PU
5VT
Memory Read
MEMR# is asserted for any memory read accesses. It enables 16-bit
memory slaves to decode the memory address on SA[23:0].
This pin is internally connected to a 20-kohm pull-up resistor.
MEMW#
AF20
I/O
PU
5VT
Memory Write
MEMW# is asserted for any memory write accesses. It enables 16-bit
memory slaves to decode the memory address on SA[23:0].
This pin is internally connected to a 20-kohm pull-up resistor.
AEN
AE8
O
Address Enable
AEN asserted indicates that a DMA transfer is in progress, informing I/O
devices to ignore the I/O cycle.
IRQ[15:14], [12:9],
[7:3], 1
Refer
to
Table
2-3
I
5VT
ISA Bus Interrupt Request
IRQ8#
AE14
I
5VT
Real-Time Clock Interrupt
Revision 4.1
IRQ inputs indicate ISA devices or other devices requesting a CPU interrupt service.
IRQ8# is the (active-low) interrupt that can come from the external RTC
chip and indicates a date/time update has completed.
29
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Geode™ CS5530
Signal Definitions (Continued)
2.2.5
ISA Bus Interface (Continued)
Signal Name
Pin
No.
Type
Description
DMA Request - Channels [7:5], [3:0]
DRQ[7:5],
DRQ[3:0]
Refer
to
Table
2-3
I
5VT
DACK[7:5]#,
DACK[3:0]#
Refer
to
Table
2-3
O
TC
AF15
O
DRQ inputs are asserted by ISA DMA devices to request a DMA transfer.
The request must remain asserted until the corresponding DACK is
asserted.
DMA Acknowledge - Channels [7:5], [3:0]
DACK outputs are asserted to indicate when a DRQ is granted and the
start of a DMA cycle.
Terminal Count
TC signals the final data transfer of a DMA transfer.
2.2.6
ROM Interface
Signal Name
Pin
No.
Type
KBROMCS#
AE4
O
Description
Keyboard/ROM Chip Select
KBROMCS# is the enable pin for the BIOS ROM and for the keyboard
controller. For ROM accesses, KBROMCS# is asserted for ISA memory
accesses programmed at F0 Index 52h[2:0].
For keyboard controller accesses, KBROMCS# is asserted for I/O
accesses to I/O Ports 060h, 062h, 064h, and 066h.
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Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.7
IDE Interface
Signal Name
Pin
No.
Type
IDE_RST#
W25
O
Description
IDE Reset
This signal resets all the devices that are attached to the IDE interface.
IDE_ADDR[2:0]
W24,
U26,
U25
O
Refer
to
Table
2-3
I/O
5VT
IDE_IOR0#
R26
O
IDE I/O Read for Channels 0 and 1
IDE_IOR1#
R25
O
IDE_IOR0# is the read signal for Channel 0, and IDE_IOR1# is the read
signal for Channel 1. Each signal is asserted on read accesses to the corresponding IDE port addresses.
IDE_DATA[15:0]
IDE Address Bits
These address bits are used to access a register or data port in a device
on the IDE bus.
IDE Data Lines
IDE_DATA[15:0] transfers data to/from the IDE devices.
When in Ultra DMA/33 mode, these signals are redefined:
Read Cycle — DMARDY0# and DMARDY1#
Write Cycle — STROBE0 and STROBE1
IDE_IOW0#
R24
O
IDE I/O Write for Channels 0 and 1
IDE_IOW1#
T25
O
IDE_IOW0# is the write signal for Channel 0, and IDE_IOW1# is the read
signal for Channel 1. Each signal is asserted on write accesses to corresponding the IDE port addresses.
When in Ultra DMA/33 mode, these signals are redefined:
Read Cycle — STOP0 and STOP1
Write Cycle — STOP0 and STOP1
IDE_CS0#
V26
O
IDE Chip Selects
IDE_CS1#
Y26
O
The chip select signals are used to select the command block registers in
an IDE device.
IDE_IORDY0
AD25
I
5VT
IDE_IORDY1
AE26
I
5VT
I/O Ready Channels 0 and 1
When deasserted, these signals extend the transfer cycle of any host register access when the device is not ready to respond to the data transfer
request.
When in Ultra DMA/33 mode, these signals are redefined:
Read Cycle — STROBE0 and STROBE1
Write Cycle — DMARDY0# and DMARDY1#
IDE_DREQ0
AD26
I
5VT
IDE_DREQ1
AC24
I
5VT
IDE_DACK0#
T26
O
DMA Acknowledge Channels 0 and 1
IDE_DACK1#
T24
O
The DACK# acknowledges the DREQ request to initiate DMA transfers.
Revision 4.1
DMA Request Channels 0 and 1
The DREQ is used to request a DMA transfer from the CS5530. The
direction of the transfers are determined by the IDE_IOR/IOW signals.
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Geode™ CS5530
Signal Definitions (Continued)
2.2.8
USB Interface
Signal Name
Pin
No.
Type
POWER_EN
V4
O
Description
Power Enable
This pin enables the power to a self-powered USB hub.
OVER_CUR#
D+_PORT1
W3
Y2
I
5VT
Over Current
I/O
USB Port 1 Data Positive
This pin indicates the USB hub has detected an overcurrent on the USB.
This pin is the Universal Serial Bus Data Positive for port 1.
D–_PORT1
Y1
I/O
USB Port 1 Data Minus
This pin is the Universal Serial Bus Data Minus for port 1.
D+_PORT2
AA2
I/O
USB Port 2 Data Positive
This pin is the Universal Serial Bus Data Positive for port 2.
D–_PORT2
AA1
I/O
USB Port 2 Data Minus
This pin is the Universal Serial Bus Data Minus for port 2.
2.2.9
Game Port and General Purpose I/O Interface
Signal Name
Pin
No.
Type
GPORT_CS#
AD21
O
Description
Game Port Chip Select
GPORT_CS# is asserted upon any I/O reads or I/O writes to I/O Port
200h and 201h.
GPCS#
AF26
O
General Purpose Chip Select
GPCS# is asserted upon any I/O access that matches the I/O address in
the General Purpose Chip Select Base Address Register (F0 Index 70h)
and the conditions set in the General Purpose Chip Select Control Register (F0 Index 72h).
GPIO7/SA23
AF23
I/O
5VT
Limited ISA Mode: General Purpose I/Os 7 through 4 or
System Address Bus Lines 23 through 20
GPIO6/SA22
AE23
GPIO5/SA21
AC21
These pins can function either as general purpose I/Os or as the upper
four bits of the SA bus. Selection is done through F0 Index 43h[6,2].
GPIO4/SA20
AD22
Refer to GPIO[3:2] signal description for GPIO function description.
ISA Master Mode: System Address Bus Lines 23 through 20
These pins function as the four MSB (most significant bits) of the SA bus.
GPIO3
AF24
I/O
5VT
GPIO2
AF25
I/O
5VT
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General Purpose I/Os 3 and 2
GPIOs can be programmed to operate as inputs or outputs via F0 Index
90h. As an input, the GPIO can be configured to generate an external
SMI. Additional configuration can select if the SMI# is generated on the
rising or falling edge. GPIO external SMI generation/edge selection is
done in F0 Index 92h and 97h.
32
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.9
Game Port and General Purpose I/O Interface (Continued)
Pin
No.
Signal Name
GPIO1/
SDATA_IN2
AE24
Type
Description
I/O
5VT
General Purpose I/O 1 or Serial Data Input 2
This pin can function either as a general purpose I/O or as a second serial
data input pin if two codecs are used in the system.
In order for this pin to function as SDATA_IN2, it must first be configured
as an input (F0 Index 90h[1] = 0). Then setting F3BAR+Memory Offset
08h[21] = 1 selects the pin to function as SDATA_IN2.
Refer to GPIO[3:2] signal description for GPIO function description.
GPIO0
AC22
I/O
5VT
General Purpose I/O 0
Type
Description
Audio Bit Clock
Refer to GPIO[3:2] signal description for GPIO function description.
2.2.10 Audio Interface
Signal Name
Pin
No.
BIT_CLK
V2
I
5VT
SDATA_OUT
V1
O
The serial bit clock from the codec.
Serial Data I/O
This output transmits audio serial data to the codec.
SDATA_IN
SYNC
U4
U3
I
5VT
O
Serial Data Input
This input receives serial data from the codec.
Serial Bus Synchronization
This bit is asserted to synchronize the transfer of data between the
CS5530 and the AC97 codec
PC_BEEP
V3
O
PC Beep
Legacy PC/AT speaker output.
Revision 4.1
33
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Geode™ CS5530
Signal Definitions (Continued)
2.2.11 Display Interface
Signal Name
Pin
No.
Type
Description
A13
I
Pixel Clock
Pixel Port
PCLK
This clock is used to sample data on the PIXEL input port. It runs at the
graphics DOT clock (DCLK) rate.
PIXEL[23:0]
ENA_DISP
Refer
to
Table
2-3
I
B1
I
Pixel Data Port
This is the input pixel data from the processor’s display controller. If
F4BAR+Memory Offset 00h[29] is reset, the data is sent in RGB 8:8:8 format. Otherwise, the pixel data is sent in RGB 5:6:5 format which has been
dithered by the processor. The other eight bits are used in conjunction
with VID_DATA[7:0] to provide 16-bit video data. This bus is sampled by
the PCLK input.
Display Enable Input
This signal qualifies active data on the pixel input port. It is used to qualify
active pixel data for all display modes and configurations and is not specific to flat panel display.
Display CRT
HSYNC
C6
I
Horizontal Sync Input
This is the CRT horizontal sync input from the processor’s display controller. It is used to indicate the start of a new video line. This signal is pipelined for the appropriate number of clock stages to remain in sync with the
pixel data. A separate output (HSYNC_OUT) is provided to re-drive the
CRT and flat panel interfaces.
HSYNC_OUT
N1
O
Horizontal Sync Output
This is the horizontal sync output to the CRT. It represents a delayed version of the input horizontal sync signal with the appropriate pipeline delay
relative to the pixel data. The pipeline delay and polarity of this signal are
programmable.
VSYNC
B5
I
Vertical Sync Input
This is the CRT vertical sync input from the processor’s display controller.
It is used to indicate the start of a new frame. This signal is pipelined for
the appropriate number of clock stages to remain in sync with the pixel
data. A separate output (VSYNC_OUT) is provided to re-drive the CRT
and flat panel interfaces.
VSYNC_OUT
N2
O
Vertical Sync Output
This is the vertical sync output to the CRT. It represents a delayed version
of the input vertical sync signal with the appropriate pipeline delay relative
to the pixel data. The pipeline delay and polarity of this signal are programmable.
DDC_SCL
M2
O
DDC Serial Clock
This is the serial clock for the VESA Display Data Channel interface. It is
used for monitor communications. The DDC2B standard is supported by
this interface.
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34
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.11 Display Interface (Continued)
Signal Name
Pin
No.
DDC_SDA
M4
Type
Description
I/O
5VT
DDC Serial Data
This is the bidirectional serial data signal for the VESA Display Data
Channel interface. It is used to monitor communications. The DDC2B
standard is supported by this interface.
The direction of this pin can be configured through F4BAR+Memory Offset 04h[24]: 0 = Input; 1 = Output.
IREF
(Video DAC)
R3
I
Analog
VDAC Current Reference Input
VREF
(Video DAC)
T1
I
Analog
VDAC Voltage Reference Output
EXTVREFIN
(Video DAC)
T2
I
Analog
External Voltage Reference Pin
AVDD1 (DAC)
U1
I
Analog
Analog Power for Video DAC
AVDD2 (VREF)
T3
AVDD3 (DAC)
N4
AVSS1 (DAC)
R2
I
Analog
Analog Ground for Video DAC
AVSS2 (ICAP)
R4
AVSS3 (VREF)
T4
AVSS4 (ICAP)
P1
AVSS5 (DAC)
P2
IOUTR
(Video DAC)
P3
O
Analog
Red DAC Output
IOUTG
(Video DAC)
P4
O
Analog
Green DAC Output
IOUTB
(Video DAC)
R1
O
Analog
Blue DAC Output
Connect a 732 ohm resistor between this pin and AVSS (analog ground
for Video DAC).
Unused DAC output. Connect a 0.1 µF capacitor between this pin and
AVSS (analog ground for Video DAC).
When using an external voltage reference, connect this pin to a 1.235V
voltage reference.
These pins provide power to the analog portions of the Video DAC.
These pins provide the ground plane connections to the analog portions
of the Video DAC.
Red analog output.
Green analog output.
Blue analog output.
Display TFT/TV
FP_DATA17/
MASTER#
F3
O
Limited ISA Mode: Flat Panel Data Port Line 17
Refer to FP_DATA[15:0] signal description.
I
ISA Master Mode: Master
Refer to Section 2.2.5 “ISA Bus Interface” on page 27 for this signal’s definition.
FP_DATA16/
SA_OE#
H3
O
Limited ISA Mode: Flat Panel Data Port Line 16
Refer to FP_DATA[15:0] signal description.
O
ISA Master Mode: System Address Transceiver Output Enable
Refer to Section 2.2.5 “ISA Bus Interface” on page 27 for this signal’s definition.
Revision 4.1
35
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Geode™ CS5530
Signal Definitions (Continued)
2.2.11 Display Interface (Continued)
Signal Name
FP_DATA[15:0]/
SA[15:0]
Pin
No.
Refer
to
Table
2-3
Type
O
Description
Limited ISA Mode: Flat Panel Data Port Lines 15 through 0
This is the data port to an attached active matrix TFT panel. This port may
optionally be tied to a DSTN formatter chip, LVDS transmitter, or digital
NTSC/PAL encoder.
F4BAR+Memory Offset 04h[7] enables the flat panel data bus:
0 = FP_DATA[17:0] is forced low
1 = FP_DATA[17:0] is driven based upon power sequence control
I/O
ISA Master Mode: System Address Bus Lines 15 through 0
These pins function as SA[15:0] and the pins designated as SA/SD[15:0]
function only as SD[15:0].
Note that SA[19:16] are dedicated address pins and GPIO[7:4] function
as SA[23:20] only.
FP_CLK
M1
O
Limited ISA Mode: Flat Panel Clock
This is the clock for the flat panel interface.
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 cannot support TFT flat
panels or TV controllers.
FP_CLK_EVEN
L3
O
Limited ISA Mode: Flat Panel Even Clock
This is an optional output clock for a set of external latches used to demultiplex the flat panel data bus into two channels (odd/even). Typically
this would be used to interface to a pair of LVDS transmitters driving an
XGA resolution flat panel.
F4BAR+Memory Offset 04h[12] enables the FP_CLK_EVEN output:
0 = Standard flat panel
1 = XGA flat panel
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 can not support TFT flat
panels or TV controllers.
FP_HSYNC
C2
I
Limited ISA Mode: Flat Panel Horizontal Sync Input
This is the horizontal sync input reference from the processor’s display
controller. The timing of this signal is independent of the standard (CRT)
horizontal sync input to allow a different timing relationship between the
flat panel and an attached CRT.
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 can not support TFT flat
panels or TV controllers.
FP_HSYNC_OUT
/SMEMW#
E1
O
Limited ISA Mode: Flat Panel Horizontal Sync Output
This is the horizontal sync for an attached active matrix TFT flat panel.
This represents a delayed version of the input flat panel horizontal sync
signal with the appropriate pipeline delay relative to the pixel data.
ISA Master Mode: System Memory Write
Refer to Section 2.2.5 “ISA Bus Interface” on page 28 for this signal’s definition.
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36
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.11 Display Interface (Continued)
Signal Name
Pin
No.
Type
FP_VSYNC
C1
I
Description
Limited ISA Mode: Flat Panel Vertical Sync Input
This is the vertical sync input reference from the processor’s display controller. The timing of this signal is independent of the standard (CRT) vertical sync input to allow a different timing relationship between the flat panel
and an attached CRT.
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 can not support TFT flat
panels or TV controllers.
FP_VSYNC_OUT
/SMEMR#
E3
O
Limited ISA Mode: Flat Panel Vertical Sync Output
This is the vertical sync for an attached active matrix TFT flat panel. This
represents a delayed version of the input flat panel vertical sync signal
with the appropriate pipeline delay relative to the pixel data.
ISA Master Mode: System Memory Read
Refer to Section 2.2.5 “ISA Bus Interface” on page 28 for this signal’s definition.
FP_DISP_
ENA_OUT
F2
O
Flat Panel Display Enable Output
This is the display enable for an attached active matrix TFT flat panel. This
signal qualifies active pixel data on the flat panel interface.
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 can not support TFT flat
panels or TV controllers.
FP_ENA_VDD
L2
O
Flat Panel VDD Enable
This is the enable signal for the VDD supply to an attached flat panel. It is
under the control of power sequence control logic. A transition on bit 6 of
the Display Configuration Register (F4BAR+Memory Offset 04h) initiates
a power-up/down sequence.
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 can not support TFT flat
panels or TV controllers.
FP_ENA_BKL
J4
O
Flat Panel Backlight Enable Output
This is the enable signal for the backlight power supply to an attached flat
panel. It is under control of the power sequence control logic.
--
ISA Master Mode: No Function
In the ISA Master mode of operation, the CS5530 can not support TFT flat
panels or TV controllers.
Display MPEG
VID_DATA[7:0]
Revision 4.1
C12,
B12,
A12,
D11,
C11,
B13,
C13,
A11
I
Video Data Port
This is the input data for a video (MPEG) or graphics overlay in its native
form. For video overlay, this data is in an interleaved YUV 4:2:2 format.
For graphics overlay, the data is in RGB 5:6:5 format. This port operates
at the VID_CLK rate.
37
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Geode™ CS5530
Signal Definitions (Continued)
2.2.11 Display Interface (Continued)
Signal Name
Pin
No.
Type
Description
VID_CLK
A6
I
Video Clock
This is the clock for the video port. This clock is completely asynchronous
to the input pixel clock rate.
VID_VAL
B7
I
Video Valid
This signal indicates that valid video data is being presented on the
VID_DATA input port. If the VID_RDY signal is also asserted, the data will
advance.
VID_RDY
B10
O
Video Ready
This signal indicates that the CS5530 is ready to receive the next piece of
video data on the VID_DATA port. If the VID_VAL signal is also asserted,
the data will advance.
2.2.12 DCLK PLL
Signal Name
Pin
No.
PLLLP
N23
PLLRO
PLLAGS
PLLVAA
PLLAGD
M26
N24
M25
N25
Type
Description
I
Analog
Loop Filter Capacitor Connection
I
Analog
VCO Center Frequency Set Resistor Connection
I
Analog
Analog Sense Pin for Connection of External Components
I
Analog
Analog PLL Power (VDD)
I
Analog
Analog PLL Ground (VSS)
The loop filter requires an external capacitor (optionally a series resistor
may be added) for adjustment of the loop filter response. The PLLLP pin
connects this capacitor to the on-chip loop filter.
The center frequency of the VCO is set with an external resistor connected between the PLLRO and PLLAGS pins. This resistor sets a constant current that controls the center frequency of the VCO.
This pin is used as the return connection for all external components. This
includes the ground connection for the loop filter capacitor and the PLLRO
resistor.
PLLVAA is the analog positive rail power connection to the PLL.
PLLAGD is the analog ground rail connection to the PLL.
PLLDVD
M23
I
Analog
Digital PLL Power (VDD)
PLLDGN
N26
I
Analog
Digital PLL Ground
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This pin is the digital VDD power connection for the PLL.
This pin is the digital ground (VSS) connection for the PLL.
38
Revision 4.1
Geode™ CS5530
Signal Definitions (Continued)
2.2.13 Power, Ground, and Reserved
Signal Name
Pin
No.
Type
Description
VDD
Refer to
Table 2-3
(Total of
19)
PWR
3.3V (nominal) Power Connection
VSS
Refer to
Table 2-3
(Total of
39)
GND
Ground Connection
NC
Refer to
Table 2-3
(Total of
17)
--
No Connection
This line should be left disconnected. Connecting it to a pull-up/-down
resistor or to an active signal could cause unexpected results and possible malfunctions.
2.2.14 Internal Test and Measurement
Signal Name
Pin
No.
Type
TEST
D3
I
Description
Test Mode
TEST should be tied low for normal operation.
Revision 4.1
39
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Geode™ CS5530
3.0
Functional Description
The Geode CS5530 I/O companion provides many support functions for the GXLV processor. This chapter discusses the detailed operations of the CS5530 in two
categories: system-level activities and operations/programming of the major functional blocks.
All of the major functional blocks interact with the processor through the PCI bus, or via its own direct interface.
The major functional blocks are divided out as:
• PC/AT Compatibility Logic
- ISA Bus Interface
- ROM Interface
- Megacells
- I/O Port 092h and 061h System Control
- Keyboard Interface Function
- External Real-Time Clock Interface
The system-level discussion topics revolve around events
that affect the device as a whole unit and as an interface
with other chips (e.g., processor): Topics include:
• Processor Interface
- Display Subsystem Connections
- PSERIAL Pin Interface
• IDE Controller
- IDE Interface Signal
- IDE Configuration Registers
• PCI Bus Interface
- PCI Initiator
- PCI Target
- Special Bus Cycles - Shutdown/Halt
- PCI Bus Parity
- PCI Interrupt Routing Support
- Delayed Transactions
• XpressAUDIO
- Data Transport Hardware
- VSA Technology Support Hardware
• Resets and Clocks
- Resets
- ISA Clock
- DOT Clock
• Display Subsystem Extensions
- Video Interface Configuration Registers
- Video Accelerator
- Video Overlay
- Gamma RAM
- Display Interface
• Power Management
- APM Support
- CPU Power Management
- Peripheral Power Management
• USB Interface
- USB PCI Controller
- USB Host Controller
- USB Power Management
Note that this Functional Description section of the data
book describes many of the registers used for configuration of the CS5530; however, not all registers are reported
in detail. Some tables in the following subsections show
only the bits (not the entire register) associated with a
specific function being discussed. For access, register,
and bit information regarding all CS5530 registers refer to
Section 4.0 “Register Descriptions” on page 137.
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40
Revision 4.1
3.1
PROCESSOR INTERFACE
The CS5530 interface to the GXLV processor consists of
seven miscellaneous connections, the PCI bus interface
signals, plus the display controller connections. Figure 3-1
shows the interface requirements. Note that the PC/AT
legacy pins NMI, WM_RST, and A20M are all virtual functions executed in SMM (System Management Mode) by
the BIOS.
Geode™ CS5530
I/O Companion
• PSERIAL is a one-way serial bus from the processor to
the CS5530 used to communicate power-management
states and VSYNC information for VGA emulation.
• IRQ13 is an input from the processor indicating that a
floating point error was detected and that INTR should
be asserted.
• INTR is the level output from the integrated 8259 PICs
and is asserted if an unmasked interrupt request
(IRQn) is sampled active.
• SMI# is a level-sensitive interrupt to the processor that
can be configured to assert on a number of different
system events. After an SMI# assertion, SMM is
entered and program execution begins at the base of
the SMM address space. Once asserted, SMI#
remains active until the SMI source is cleared.
Geode™ GXLV
Processor
PSERIAL
IRQ13
INTR
SMI#
SUSP#
SUSPA#
CPU_RST
SERIALP
IRQ13
INTR
SMI#
SUSP#
SUSPA#
RESET
AD[31:0]
C/BE[3:0]#
PAR
FRAME#
IRDY#
TRDY#
STOP#
LOCK#
DEVSEL#
PERR#
SERR#
REQ#
GNT#
AD[31:0]
C/BE[3:0]#
PAR
FRAME#
IRDY#
TRDY#
STOP#
LOCK#
DEVSEL#
PERR#
SERR#
REQ0#
GNT0#
PCLK
DCLK
CRT_HSYNC
CRT_VSYNC
FP_HSYNC
FP_VSYNC
ENA_DISP
VID_VAL
VID_CLK
VID_DATA[7:0]
VID_RDY
PCLK
DCLK
HSYNC
VSYNC
FP_HSYNC
FP_VSYNC
ENA_DISP
VID_VAL
VID_CLK
VID_DATA[7:0]
VID_RDY
• SUSP# and SUSPA# are handshake pins for implementing CPU Clock Stop and clock throttling.
• CPU_RST resets the CPU and is asserted for approximately 9 ms after the negation of POR#.
• PCI bus interface signals.
• Display subsystem interface connections.
Note
PIXEL[23:0]
PIXEL[17:0]
Note: Refer to Figure 3-3 for correct interconnection
of PIXEL lines with the processor.
Figure 3-1. Processor Signal Connections
Revision 4.1
41
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.1.1 Display Subsystem Connections
When the GXLV processor is used in a system with the
CS5530, the need for an external RAMDAC is eliminated.
The CS5530 contains the DACs, a video accelerator
engine, and the TFT interface.
The CS5530 also supports both portable and desktop
configurations. Figure 3-2 shows the signal connections
for both types of systems.
Figure 3-3 details how PIXEL[17:0] on the processor connects with PIXEL[23:0] of the CS5530.
Portable
Configuration
PCLK
VID_CLK
DCLK
FP_HSYNC
FP_VSYNC
ENA_DISP
VID_RDY
VID_DATA[7:0]
VID_VAL
CRT_HSYNC
CRT_VSYNC
PIXEL[17:12]
PIXEL[11:6]
PIXEL[5:0]
PCLK
VID_CLK
DCLK
FP_HSYNC
FP_VSYNC
ENA_DISP
VID_RDY
VID_DATA[7:0]
VID_VAL
HSYNC
VSYNC
Pwr
Cntrl
Logic
FP_ENA_VDD
FP_ENA_BKL
FP_DISP_ENA_OUT
VDD
12VBKL
ENAB
FP_HSYNC_OUT
FP_VSYNC_OUT
FP_CLK
HSYNC
VSYNC
CLK
FP_DATA[17:12]
FP_DATA[11:6]
FP_DATA[5:0]
PIXEL[23:18]*
PIXEL[15:10]*
PIXEL[7:2]*
TFT
Flat
Panel
R[5:0]
G[5:0]
B[5:0]
HSYNC
VSYNC
CLK
TV
NTSC/PAL
Encoder
R[5:0]
G[5:0]
B[5:0]
Geode™
GXLV
Processor
Geode™ CS5530
I/O Companion
HSYNC_OUT
VSYNC_OUT
Pin 13
DDC_SCL
DDC_SDA
Pin 15
Pin 12
Pin 14
Pin 3
Pin 2
Pin 1
VGA
Port
IOUTR
IOUTG
IOUTB
Note: *Connect PIXEL[17:16] PIXEL[9:8], and PIXEL[1:0] on the CS5530 to ground. See Figure 3-3.
Figure 3-2. Portable/Desktop Display Subsystem Configurations
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42
Revision 4.1
Geode™ GXLV
Processor
PIXEL17
PIXEL23
PIXEL16
PIXEL22
PIXEL15
PIXEL21
PIXEL14
PIXEL20
PIXEL13
PIXEL19
PIXEL12
PIXEL18
Geode™ CS5530
I/O Companion
PIXEL17
PIXEL16
PIXEL11
PIXEL15
PIXEL10
PIXEL14
PIXEL9
PIXEL13
PIXEL8
PIXEL12
PIXEL7
PIXEL11
PIXEL6
PIXEL10
PIXEL9
PIXEL8
PIXEL5
PIXEL7
PIXEL4
PIXEL6
PIXEL3
PIXEL5
PIXEL2
PIXEL4
PIXEL1
PIXEL3
PIXEL0
PIXEL2
PIXEL1
PIXEL0
Figure 3-3. PIXEL Signal Connections
Revision 4.1
43
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.1.2 PSERIAL Pin Interface
The majority of the system power management logic is
implemented in the CS5530, but a minimal amount of
logic is contained within the GXLV processor to provide
information that is not externally visible (e.g., graphics
controller).
The CS5530 decodes the serial packet after each transmission and performs the power management tasks
related to video retrace.
Table 3-1. GXLV Processor Serial Packet
Register
The processor implements a simple serial communications mechanism to transmit the CPU status to the
CS5530. The processor accumulates CPU events in an 8bit register (defined in Table 3-1) which it transmits serially
every 1 to 10 µs.
Bit
The packet transmitter holds the serial output pin (PSERIAL) low until the transmission interval counter has
elapsed. Once the counter has elapsed, the PSERIAL pin
is held high for two clocks to indicate the start of packet
transmission. The contents of the Serial Packet Register
are then shifted out starting from bit 7 down to bit 0. The
PSERIAL pin is held high for one clock to indicate the end
of packet transmission and then remains low until the next
transmission interval. After the packet transmission is
complete, the processor’s Serial Packet Register’s contents are cleared.
Once a bit in the register is set, it remains set until the
completion of the next packet transmission. Successive
events of the same type that occur between packet transmissions are ignored. Multiple unique events between
packet transmissions accumulate in this register. The processor transmits the contents of the serial packet only
when a bit in the Serial Packet Register is set and the
interval counter has elapsed.
Video IRQ: This bit indicates the occurrence of a video
vertical sync pulse. This bit is set at the same time that
the VINT (Vertical Interrupt) bit gets set in the
DC_TIMING_CFG register. The VINT bit has a corresponding enable bit (VIEN) in the DC_TIM_CFG register.
6
CPU Activity: This bit indicates the occurrence of a
level 1 cache miss that was not a result of an instruction fetch. This bit has a corresponding enable bit in
the PM_CNTL_TEN register.
Reserved
1
Programmable Address Decode: This bit indicates
the occurrence of a programmable memory address
decode. The bit is set based on the values of the
PM_BASE register and the PM_MASK register. The
PM_BASE register can be initialized to any address in
the full CPU address range.
0
Video Decode: This bit indicates that the CPU has
accessed either the display controller registers or the
graphics memory region. This bit has a corresponding
enable bit in the PM_CNTRL_TEN.
3.1.2.1 Video Retrace Interrupt
Bit 7 of the “Serial Packet” can be used to generate an
SMI whenever a video retrace occurs within the processor. This function is normally not used for power management but for SoftVGA routines.
For more information on the Serial Packet Register referenced in Table 3-1, refer to the GXLV processor data
book.
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7
5:2
The processor’s input clock is used as the clock reference
for the serial packet transmitter.
Description
Setting F0 Index 83h[2] = 1 (bit details on page 159)
enables this function. A read only status register located
at F1BAR+Memory Offset 00h[5] (bit details on page 180)
can be read to see if the SMI was caused by a video
retrace event.
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Revision 4.1
3.2
PCI BUS INTERFACE
The PCI bus interface is compliant with the PCI Bus Specification Rev. 2.1.
Note:
The CS5530 acts as a PCI target for PCI cycles initiated
by the processor or other PCI master devices, or as an initiator for DMA, ISA, IDE, and audio master transfer cycles.
It supports positive decode for memory and I/O regions
and is the subtractive decode agent on the PCI bus. The
CS5530 also generates address and data parity and performs parity checking. A PCI bus arbiter is not part of the
CS5530; however, one is included in the GXLV processor.
In a GXLV processor-based system, the
REQ#/GNT# signals of the CS5530 should connect to the REQ0#/GNT0# of the processor. This
configuration ensures that the CS5530 is treated
as a non-preemptable PCI master by the processor.
The CS5530 asserts REQ# in response to a bus mastering or DMA request for ownership of the PCI bus. GNT# is
asserted by the PCI arbiter (i.e., processor) to indicate
that access to the PCI bus has been granted to the
CS5530. The CS5530 then issues a grant to the DMA
controller. This mechanism prevents any deadlock situations across the bridge. Once granted the PCI bus, the
ISA master or DMA transfer commences.
The PCI Command Register, located at F0 Index 04h
(Table 3-2), provides the basic control over the CS5530’s
ability to respond and perform PCI bus accesses.
3.2.1 PCI Initiator
The CS5530 acts as a PCI bus master on behalf of the
DMA controller or ISA, IDE, and audio interfaces. The
REQ# and GNT# signals are used to arbitrate for the PCI
bus.
If an ISA master executes an I/O access, that cycle
remains on the ISA bus and is not forwarded to the PCI
bus. The CS5530 performs only single transfers on the
PCI bus for legacy DMA cycles.
Table 3-2. PCI Command Register
Bit
Description
F0 Index 04h-05h
15:10
PCI Command Register (R/W)
Reset Value = 0000h
Reserved: Set to 0.
9
Fast Back-to-Back Enable (Read Only): This function is not supported when the CS5530 is a master. It is always disabled (always reads 0).
8
SERR#: Allow SERR# assertion on detection of special errors: 0 = Disable (Default); 1 = Enable.
7
Wait Cycle Control (Read Only): This function is not supported in the CS5530. It is always disabled
(always reads 0).
6
Parity Error: Allow the CS5530 to check for parity errors on PCI cycles for which it is a target, and to assert PERR# when
a parity error is detected: 0 = Disable (Default); 1 = Enable.
5
VGA Palette Snoop Enable (Read Only): This function is not supported in the CS5530. It is always disabled (always
reads 0).
4
Memory Write and Invalidate: Allow the CS5530 to do memory write and invalidate cycles, if the PCI Cache Line Register (F0 Index 0Ch) is set to 16 bytes (04h). 0 = Disable (Default); 1 = Enable.
3
Special Cycles: Allow the CS5530 to respond to special cycles: 0 = Disable; 1 = Enable (Default).
This bit must be enabled to allow the CPU Warm Reset internal signal to be triggered from a CPU Shutdown cycle.
2
Bus Master: Allow the CS5530 bus mastering capabilities: 0 = Disable; 1 = Enable (Default).
This bit must be set to 1.
1
Memory Space: Allow the CS5530 to respond to memory cycles from the PCI bus:
0 = Disable; 1 = Enable (Default).
0
I/O Space: Allow the CS5530 to respond to I/O cycles from the PCI bus: 0 = Disable; 1 = Enable (Default).
Revision 4.1
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.2.2 PCI Target
The CS5530 positively decodes PCI transactions
intended for any internal registers, the ROM address
range, and several peripheral and user-defined address
ranges. For positive-decoded transactions, the CS5530 is
a medium responder. Table 3-3 lists the valid C/BE#
encoding for PCI target transactions.
Table 3-3. PCI Command Encoding
C/BE[3:0]#
Command Type
0000
Interrupt Acknowledge
0001
Special Cycles: Shutdown, AD[15:0] = 0000
0010
I/O Read
0011
I/O Write
Special Cycles: Halt, AD[15:0] = 0001
The CS5530 acts as the subtractive agent in the system
since it contains the ISA bridge functionality. Subtractive
decoding ensures that all accesses not positively claimed
by PCI devices are forwarded to the ISA bus. The subtractive-decoding sample point can be configured as slow,
default, or disabled via F0 Index 41h[2:1]. Table 3-4 shows
these programming bits. Figure 3-4 shows the timing for
subtractive decoding.
010x
Reserved
0110
Memory Read
0111
Memory Write
100x
Reserved
1010
Configuration Read
1011
Configuration Write
1100
Memory Read Multiple
(memory read only)
1101
Reserved
1110
Memory Read Line (memory read only)
1111
Memory Write, Invalidate (memory write)
Table 3-4. Subtractive Decoding Related Bits
Bit
Description
F0 Index 41h
2:1
PCI Function Control Register 2 (R/W)
Reset Value = 10h
Subtractive Decode: These bits determine the point at which the CS5530 accepts cycles that are not claimed by another
device. The CS5530 defaults to taking subtractive decode cycles in the default cycle clock, but can be moved up to the
Slow Decode cycle point if all other PCI devices decode in the fast or medium clocks. Disabling subtractive decode must
be done with care, as all ISA and ROM cycles are decoded subtractively.
00 = Default sample (4th clock from FRAME# active)
01 = Slow sample (3rd clock from FRAME# active)
1x = No subtractive decode
PCI_CLK
FRAME#
IRDY#
TRDY#
DEVSEL#
FAST
MED
SLOW
SUB
Figure 3-4. Subtractive Decoding Timing
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46
Revision 4.1
3.2.3 Special Bus Cycles–Shutdown/Halt
The PCI interface does not pass Special Bus Cycles to
the ISA interface, since special cycles by definition have
no destination. However, the PCI interface monitors the
PCI bus for Shutdown and Halt Special Bus Cycles.
parity for read cycles and it generates data parity for write
cycles. The PAR signal is an even-parity bit that is calculated across 36 bits of AD[31:0] plus C/BE[3:0]#.
By default, the CS5530 does not report parity errors. However, the CS5530 detects parity errors during the data
phase if F0 Index 04h[6] is set to 1. If enabled and a data
parity error is detected, the CS5530 asserts PERR#. It
also asserts SERR# if F0 Index 41h[5] is set to 1. This
allows NMI generation.
Upon detection of a Shutdown Special Bus Cycle, a
WM_RST SMI is generated after a delay of three PCI
clock cycles. PCI Shutdown Special Cycles are detected
when C/BE[3:0]# = 0001 during the address phase and
AD[31:0] = xxxx0000h during the data phase. C/BE[3:0]#
are also properly asserted during the data phase.
The CS5530 also detects parity errors during the address
phase if F0 Index 04h[6] is set. When parity errors are
detected during the address phase, SERR# is asserted
internally. Parity errors are reported to the CPU by
enabling the SERR# source in I/O Port 061h (Port B) control register. The CS5530 sets the corresponding error bits
in the PCI Status Register (F0 Index 06h[15:14]). Table 35 shows these programming bits.
Upon detection of a Halt Special Bus Cycle, the CS5530
completes the cycle by asserting TRDY#. PCI Halt Special Bus Cycles are detected when CBE[3:0]# = 0001 during the address phase and AD[31:0] = xxxx0001h during
the data phase of a Halt cycle. CBE[3:0]# are also properly asserted during the data phase.
If the CS5530 is the PCI master for a cycle and detects
PERR# asserted, it generates SERR# internally.
3.2.4 PCI Bus Parity
When the CS5530 is the PCI initiator, it generates
address parity for read and write cycles. It checks data
Table 3-5. PERR#/SERR# Associated Register Bits
Bit
Description
F0 Index 04h-05h
6
Reset Value = 0000h
Parity Error: Allow the CS5530 to check for parity errors on PCI cycles for which it is a target, and to assert PERR# when
a parity error is detected: 0 = Disable (Default); 1 = Enable.
F0 Index 06h-07h
15
PCI Command Register (R/W)
PCI Status Register (R/W)
Reset Value = 0280h
Detected Parity Error: This bit is set whenever a parity error is detected.
Write 1 to clear.
14
Signaled System Error: This bit is set whenever the CS5530 asserts SERR# active.
Write 1 to clear.
F0 Index 41h
5
Revision 4.1
PCI Function Control Register 2 (R/W)
Reset Value = 10h
PERR# Signals SERR#: Assert SERR# any time that PERR# is asserted or detected active by the CS5530 (allows
PERR# assertion to be cascaded to NMI (SMI) generation in the system): 0 = Disable; 1 = Enable.
47
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.2.5 PCI Interrupt Routing Support
The CS5530 allows the PCI interrupt signals INTA#,
INTB#, INTC#, and INTD# (also know in industry terms as
PIRQx#) to be mapped internally to any IRQ signal via
register programming (shown in Table 3-6). Further details
are supplied in Section 3.5.4.4 “PCI Compatible Interrupts” on page 98 regarding edge/level sensitivity selection.
3.2.6
The CS5530 supports delayed transactions to prevent
slow PCI cycles from occupying too much bandwidth and
allows access for other PCI traffic.
Note:
For systems which have only the GXLV processor
and CS5530 on the PCI bus, system performance
is improved if delayed transactions are disabled.
F0 Index 42h[5] and F0 Index 43h[1] are used to program
this function. Table 3-7 shows these bit formats.
Delayed Transactions
Table 3-6. PCI Interrupt Steering Registers
Bit
Description
F0 Index 5Ch
7:4
PCI Interrupt Steering Register 1 (R/W)
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
3:0
Reset Value = 00h
INTB# Target Interrupt: Selects target interrupt for INTB#:
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
INTA# Target Interrupt: Selects target interrupt for INTA#:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
‘
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
Note: The target interrupt must first be configured as level sensitive via I/O Port 4D0h and 4D1h in order to maintain PCI
interrupt compatibility
F0 Index 5Dh
7:4
PCI Interrupt Steering Register 2 (R/W)
INTD# Target Interrupt: Selects target interrupt for INTD#:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
3:0
Reset Value = 00h
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
INTC# Target Interrupt: Selects target interrupt for INTC#:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
Note: The target interrupt must first be configured as level sensitive via I/O Port 4D0h and 4D1h in order to maintain PCI
interrupt compatibility
Table 3-7. Delay Transaction Programming Bits
Bit
Description
F0 Index 42h
5
PCI Function Control Register 3 (R/W)
Reset Value = ACh
Delayed Transactions: Allow delayed transactions on the PCI bus: 0 = Disable; 1 = Enable.
Also see F0 Index 43h[1].
F0 Index 43h
1
USB Shadow Register (R/W)
Reset Value = 03h
PCI Retry Cycles: When the CS5530 is a PCI target and the PCI buffer is not empty, allow PCI bus to retry cycles:
0 = Disable; 1 = Enable.
This bit works in conjunction with PCI bus delayed transactions bit. F0 Index 42h[5] must = 1 for this bit to be valid.
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Revision 4.1
3.3
RESETS AND CLOCKS
The operations of resets and clocks in the CS5530 are
described in this section of the Functional Description.
At any state, Power-on/Resume/Reset, the 14.31818 MHz
oscillator must be active for the resets to function.
3.3.1 Resets
The CS5530 generates two reset signals, PCI_RST# to
the PCI bus and CPU_RST to the GXLV processor. These
resets are generated after approximately 100 µs delay
from POR# active as depicted in Figure 3-5.
3.3.2 ISA Clock
The CS5530 creates the ISACLK from dividing the PCICLK. For ISA compatibility, the ISACLK nominally runs at
8.33 MHz or less. The ISACLK dividers are programmed
via F0 Index 50h[2:0] as shown in Table 3-8.
Table 3-8. ISACLK Divider Bits
Bit
Description
F0 Index 50h
2:0
PIT Control/ISA CLK Divider (R/W)
Reset Value = 7Bh
ISA Clock Divisor: Determines the divisor of the PCI clock used to make the ISA clock, which is typically
programmed for approximately 8 MHz:
000 = Divide by one
001 = Divide by two
010 = Divide by three
011 = Divide by four
100 = Divide by five
101 = Divide by six
110 = Divide by seven
111 = Divide by eight
If PCI clock = 25 MHz, use setting of 010 (divide by 3). If PCI clock = 30 or 33 MHz, use a setting of 011 (divide by 4).
POR#
100 µs
9 ms
CPU_RST
PCI_RST#
POR# minimum pulse width for CS5530 only (i.e., not a system specification) = 100 µs and 14 MHz must be running.
Figure 3-5. CS5530 Reset
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Geode™ CS5530
Funcitonal Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.3.3 DOT Clock
The DOT clock (DCLK) is generated from the 14.31818
MHz input (CLK_14MHZ). A combination of a phase
locked loop (PLL), linear feedback shift register (LFSR)
and divisors are used to generate the desired frequencies
for the DOT clock. The divisors and LFSR are configurable through the F4BAR+Memory Offset 24h. The minimum frequency of DCLK is 10 MHz and the maximum is
200 MHz.
32 KHz for Reset and
Power Management
DCLK provides a video clock for the GXLV processor. For
applications that do not use the GXLV processor’s video,
this is an available clock for general purpose use.
The system clock distribution for a CS5530/GXLV processor based system is shown in Figure 3-6.
Geode™ CS5530
I/O Companion
TVCLK from TV Controller
M
U
X
14 MHz Clock
DCLK to GXLV Processor
DCLK
PLL
PCICLK
÷N
Geode™
GXLV
Processor
ISACLK to ISA Bus
SDRAMCLK to SDRAM
SDRAMCLK to SDRAM
SDRAMCLK to SDRAM
SDRAMCLK to SDRAM
SUSP_3V
from CS5530
PCICLK to GXLV Processor
OE#
PCICLK to PCI Related Device
PCICLK to PCI Bus
14.318 MHz
Crystal
Clock
Generator
14 MHz Clock to TV Controller
14 MHz Clock to Super I/O
24.576 MHz Clock to AC97 Codec
48 MHz Clock to USB of CS5530
Figure 3-6. System Clock Distribution
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3.3.3.1 DCLK Programming
The PLL contains an input divider (ID), feedback divider
(FD) and a post divider (PD). The programming of the
dividers is through F4BAR+Memory Offset 24h (see Table
3-9). The maximum output frequency is 300 MHz. The
output frequency is given by equation #1:
The BIOS has been provided with a complete table of divisor values for supported video clock frequencies. Many
combinations of divider values and VCO frequencies are
possible to achieve a certain output clock frequency.
These BIOS values may be adjusted from time to time to
meet system frequency accuracy and jitter requirements.
For applications that do not use the GXLV processor’s
video, this is an available clock for general purpose use.
Equation #1:
DCLK = [CLK_14MHZ * FD] ÷ [PD *ID]
The transition from one DCLK frequency to another is not
guaranteed to be smooth or bounded; therefore, new
divider coefficients should only be programmed while the
PLL is off line in a situation where the transition characteristics of the clock are “don't care”. The steps below
describe (in order) how to change the DCLK frequency.
Condition:
140 MHz < [DCLK * PD] < 300 MHz
Where:
CLK_14MHZ is pin P24
FD is derived from N see equation #2 and #3:
PD is derived from bits [28:24]
ID is derived from bits [2:0]
Equation #2:
If FD is an odd number then: FD = 2*N +1
Equation #3:
If FD is an even number then: FD = 2*N +0
Where:
N is derived from bits [22:12]
+1 is achieved by setting bit 23 to 1.
+0 is achieved by clearing bit 23 to 0.
1)
Program the new clock frequency
2)
Program Reset (bit 31) high and Bypass PLL (bit 8)
high.
3)
Wait at least 500 µs for PLL to settle.
4)
Program Reset (bit 31) low.
5)
Program Bypass PLL (bit 8) low.
Example
Define Target Frequency:
Target frequency = 135 MHz
Satisfy the “Condition”:
(140 MHz < [DCLK * PD] < 300 MHz)
140 MHz < [135 MHz * 2] < 300 MHz
Therefore PD = 2
Solve Equation #1:
DCLK = [CLK_14MHZ * FD] ÷ [PD *ID]
135 = [14.31818 * FD] ÷ [2 * ID]
135 = [7.159 * FD] ÷ ID
18.86 = FD ÷ ID
Guess: ID = 7, Solve for FD
FD = 132.02
Solve Equation #2 or #3:
FD = 2*N +1 for odd FD
FD = 2*N +0 for even FD
FD is 132, therefore even
132 = 2*N +0
N = 66
Summarize:
PD = 2: Bits [28:24] = 00111
ID = 7: Bits [2:0] = 101
N = 66: Bits [22:12] = 073h (found in Table 3-10),
clear bit 23
Result:
DCLK = 135
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Geode™ CS5530
Funcitonal Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-9. DCLK Configuration Register
Bit
Description
F4BAR+Memory Offset 24h-27h
DOT Clock Configuration Register (R/W)
31
Reset: Reset the PLL: 0 = Normal operation; 1 = Reset
30
Half Clock: 0 = Enable; 1 = Disable.
Reset Value = 00000000h
For odd post divisors, half clock enables the falling edge of the VCO clock to be used to generate the falling edge of the
post divider output to more closely approximate a 50% output duty cycle.
29
28:24
Reserved: Set to 0.
5-Bit DCLK PLL Post Divisor (PD) Value: Selects value of 1 to 31:
00000 = PD divisor of 8
00001 = PD divisor of 6
00010 = PD divisor of 18
00011 = PD divisor of 4
00100 = PD divisor of 12
00101 = PD divisor of 16
00110 = PD divisor of 24
00111 = PD divisor of 2
01000 = PD divisor of 10
01001 = PD divisor of 20
01010 = PD divisor of 14
01011 = PD divisor of 26
01100 = PD divisor of 22
01101 = PD divisor of 28
01110 = PD divisor of 30
01111 = PD divisor of 1*
10000 = PD divisor of 9
10001 = PD divisor of 7
10010 = PD divisor of 19
10011 = PD divisor of 5
10100 = PD divisor of 13
10101 = PD divisor of 17
10110 = PD divisor of 25
10111 = PD divisor of 3
11000 = PD divisor of 11
11001 = PD divisor of 21
11010 = PD divisor of 15
11011 = PD divisor of 27
11100 = PD divisor of 23
11101 = PD divisor of 29
11110 = PD divisor of 31
11111 = RSVD
*See bit 11 description.
23
22:12
Plus 1 (+1): Adds 1 or 0 to FD (DCLK PLL VCO Feedback Divisor) parameter in equation (see Note):
0 = Add 0 to FD; 1 = Add 1 to FD
N: This bit represents “N” in the equation (see Note). It is used to solve the value of FD (DCLK PLL VCO Feedback Divisor). N can be a value of 1 to 400. For all values of N, refer to Table 3-10.
11
CLK_ON: 0 = PLL disable; 1 = PLL enable. If PD = 1 (i.e., bits [28:24] = 01111) the PLL is always enabled.
10
Reserved: Set to 0.
9
Select Feedback Source: 0 = DPLL; 1 = FREF.
8
Bypass PLL: Connects the input of the PLL directly to the output of the PLL: 0 = Normal Operation; 1 = Bypass PLL.
If this bit is set to 1, the input of the PLL bypasses the PLL and resets the VCO control voltage, which in turn powers down
the PLL. Allow 0.5 ms for the control voltage to be driven to 0V.
7:6
5
Reserved: Set to 0.
PLL Lock Indicator: 0 = PLL has not locked on frequency; 1 = PLL has locked on frequency.
4:3
Reserved: Set to 0.
2:0
PLL Input Divide (ID) Value: Selects value of 2 to 9 (see Note):
000 = ID divisor of 2
001 = ID divisor of 3
010 = ID divisor of 4
011 = ID divisor of 5
Note:
100 = ID divisor of 6
101 = ID divisor of 7
110 = ID divisor of 8
111 = ID divisor of 9
To calculate DCLK output frequency:
Equation #1: DCLK = [CLK_14MHZ * FD] ÷ [PD *ID]
Condition: 140 MHz < [DCLK * PD] < 300 MHz
Where:
CLK_14MHZ is pin P24
FD is derived from N see equation #2 and #3:
PD is derived from bits [28:24]
ID is derived from bits [2:0]
Equation #2: If FD is an odd number then: FD = 2*N +1
Equation #3: If FD is an even number then: FD = 2*N +0
Where: N is derived from bits [22:12]
+1 is achieved by setting bit 23 to 1.
+0 s achieved by clearing bit 23 to 0.
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Table 3-10. F4BAR+Memory Offset 24h[22:12] Decode (Value of “N”)
N
Reg.
Value
N
Reg.
Value
N
Reg.
Value
N
Reg.
Value
N
Reg.
Value
N
Reg.
Value
N
Reg.
Value
N
Reg.
Value
400
399
33A
674
350
349
11
23
300
299
6CC
598
250
249
4FA
1F4
200
199
614
428
150
149
72A
655
100
99
6A6
54C
50
49
62
C5
398
397
396
395
348
347
346
345
94
93
92
91
299
533
267
4CF
19E
33C
678
4F0
48
47
46
45
144
143
142
141
4AA
154
2A8
551
2A3
547
28F
51F
98
97
96
95
194
193
192
191
50
A1
143
286
50D
21B
437
6E
148
147
146
145
244
243
242
241
3E8
7D0
7A1
743
687
50E
21D
43B
198
197
196
195
294
293
292
291
331
662
4C4
188
310
620
440
80
248
247
246
245
344
343
342
341
47
8F
11F
23E
47D
FA
1F5
3EA
298
297
296
295
394
393
392
391
4E8
1D0
3A0
740
681
502
205
40B
44
43
42
41
18B
316
62C
458
B0
161
2C2
585
390
389
388
387
16
2D
5B
B7
340
339
338
337
7D4
7A9
753
6A7
290
289
288
287
101
202
405
A
240
239
238
237
76
ED
1DB
3B6
190
189
188
187
DD
1BB
376
6EC
140
139
138
137
23F
47F
FE
1FD
90
89
88
87
1E0
3C0
780
701
40
39
38
37
30B
616
42C
58
386
385
384
383
16F
2DE
5BD
37B
6F6
5EC
3D9
7B2
765
6CB
596
32D
65A
4B4
168
2D0
5A1
343
686
50C
219
433
66
CD
19B
336
66C
4D8
1B0
360
6C0
580
301
602
404
8
336
335
334
333
54E
29D
53B
277
4EF
1DE
3BC
778
6F1
5E2
3C5
78A
715
62B
456
AC
159
2B2
565
2CB
597
32F
65E
4BC
178
2F0
5E1
3C3
786
70D
61B
436
6C
D9
1B3
366
286
285
284
283
15
2B
57
AF
15F
2BE
57D
2FB
5F7
3EF
7DE
7BD
77B
6F7
5EE
3DD
7BA
775
6EB
5D6
3AD
75A
6B5
56A
2D5
5AB
357
6AE
55C
2B9
573
2E7
5CF
39F
73E
67D
236
235
234
233
76C
6D9
5B2
365
6CA
594
329
652
4A4
148
290
521
243
487
10E
21C
439
72
E5
1CB
396
72C
659
4B2
164
2C8
591
323
646
48C
118
230
461
C2
185
30A
186
185
184
183
5D8
3B1
762
6C5
58A
315
62A
454
A8
151
2A2
545
28B
517
22F
45F
BE
17D
2FA
5F5
3EB
7D6
7AD
75B
6B7
56E
2DD
5BB
377
6EE
5DC
3B9
772
6E5
5CA
395
136
135
134
133
3FA
7F4
7E9
7D3
7A7
74F
69F
53E
27D
4FB
1F6
3EC
7D8
7B1
763
6C7
58E
31D
63A
474
E8
1D1
3A2
744
689
512
225
44B
96
12D
25A
4B5
16A
2D4
5A9
353
86
85
84
83
603
406
C
19
33
67
CF
19F
33E
67C
4F8
1F0
3E0
7C0
781
703
607
40E
1C
39
73
E7
1CF
39E
73C
679
4F2
1E4
3C8
790
721
643
486
10C
218
431
36
35
34
33
B1
163
2C6
58D
31B
636
46C
D8
1B1
362
6C4
588
311
622
444
88
111
222
445
8A
115
22A
455
AA
155
2AA
555
2AB
557
2AF
55F
2BF
57F
2FF
5FF
3FF
382
381
380
379
378
377
376
375
374
373
372
371
370
369
368
367
366
365
364
363
362
361
360
359
358
357
356
355
354
353
352
351
Revision 4.1
332
331
330
329
328
327
326
325
324
323
322
321
320
319
318
317
316
315
314
313
312
311
310
309
308
307
306
305
304
303
302
301
282
281
280
279
278
277
276
275
274
273
272
271
270
269
268
267
266
265
264
263
262
261
260
259
258
257
256
255
254
253
252
251
232
231
230
229
228
227
226
225
224
223
222
221
220
219
218
217
216
215
214
213
212
211
210
209
208
207
206
205
204
203
202
201
182
181
180
179
178
177
176
175
174
173
172
171
170
169
168
167
166
165
164
163
162
161
160
159
158
157
156
155
154
153
152
151
53
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
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Geode™ CS5530
Funcitonal Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.4
POWER MANAGEMENT
The power management resources provided by a combined CS5530/GXLV processor based system supports a
full-featured notebook implementation. The following
explanations pertain to a full-featured “notebook” power
management system. The extent to which these
resources are employed depends on the application and
on the discretion of the system designer.
address register in Function 1 (F1) at Index 10h (F1BAR).
F1BAR sets the base address for the SMI status and
ACPI timer support registers as shown in Table 3-11.
3.4.1 APM Support
Many notebook computers rely solely on an APM
(Advanced Power Management) driver for enabling the
operating system to power-manage the CPU. APM provides several services which enhance the system power
management and is theoretically the best approach; but in
its current form, APM is imperfect for the following reasons:
Power management resources can be grouped according
to the function they enable or support. The major functions are as follows:
• APM Support
• APM is an OS-specific driver, and may not be available
for some operating systems.
• CPU Power Management
- Suspend Modulation
- 3 Volt Suspend
- Save-to-Disk
• Application support is inconsistent. Some applications
in foreground may prevent Idle calls.
• Peripheral Power Management
- Device Idle Timers and Traps
- General Purpose Timers
- ACPI Timer Register
- General Purpose I/O Pins
- Power Management SMI Status Reporting Registers
• APM does not help with Suspend determination or
peripheral power management.
The CS5530 provides two entry points for APM support:
• Software CPU Suspend control via the CPU Suspend
Command Register (F0 Index AEh)
Included in the following subsections are details regarding
the registers used for configuring power management features. The majority of these registers are directly
accessed through the PCI configuration register space
designated as Function 0 (F0). However, included in the
discussions are references to F1BAR+Memory Offset
xxh. This refers to the registers accessed through a base
• Software SMI entry via the Software SMI Register (F0
Index D0h). This allows the APM BIOS to be part of the
SMI handler.
These registers are shown in Table 3-12.
Table 3-11. Base Address Register (F1BAR) for SMI Status and ACPI Timer Support
Bit
Description
F1 Index 10h-13h
Base Address Register - F1BAR (R/W)
Reset Value = 00000000h
This register sets the base address of the memory mapped SMI status and ACPI timer related registers. Bits [7:0] are read only (00h),
indicating a 256 byte memory address range. Refer to Table 4-16 for the SMI status and ACPI timer registers bit formats and reset values. The upper 16 bytes are always mapped to the ACPI timer, and are always memory mapped.
Note: In Silicon Revision 1.3 and above the ACPI Timer Count Register is accessible through I/O Port 121Ch.
31:8
SMI Status/Power Management Base Address
7:0
Address Range (Read Only)
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Revision 4.1
Table 3-12. APM Support Registers
Bit
Description
F0 Index AEh
7:0
CPU Suspend Command Register (WO)
Reset Value = 00h
Software CPU Suspend Command (Write Only): If bit 0 in the Clock Stop Control Register is set low (F0 Index BCh[0]
= 0), a write to this register causes a SUSP#/SUSPA# handshake with the CPU, placing the CPU in a low-power state.
The data written is irrelevant. Once in this state, any unmasked IRQ or SMI releases the CPU halt
condition.
If F0 Index BCh[0] = 1, writing to this register invokes a full system Suspend. In this case, the SUSP_3V pin is asserted
after the SUSP#/SUSPA# halt. Upon a Resume event (see Note), the PLL delay programmed in the F0 Index BCh[7:4]
will be invoked, allowing the clock chip and CPU PLL to stabilize before deasserting the SUSP# pin.
Note: If the clocks are stopped, the external IRQ4 and IRQ3 pins, when enabled (F3BAR+Memory Offset 1Ah[4:3]), are
the only IRQ pins that can be used as a Resume event. If GPIO2, GPIO1, and GPIO0 are enabled as an external
SMI source (F0 Index 92h[2:0]), they too can be used as a Resume event. No other CS5530 pins can be used to
wake-up the system from Suspend when the clocks are stopped. As long as the 32 KHz clock remains active,
internal SMI events are also Resume events.
F0 Index D0h
7:0
Software SMI Register (WO)
Reset Value = 00h
Software SMI (Write Only): A write to this location generates an SMI. The data written is irrelevant. This register allows
software entry into SMM via normal bus access instructions.
3.4.2 CPU Power Management
The three greatest power consumers in a system are the
display, the hard drive, and the CPU. The power management of the first two is relatively straightforward and is discussed in Section 3.4.3 “Peripheral Power Management”
on page 60.
In order to provide high-speed performance when
needed, the SUSP# pin modulation is temporarily disabled any time system activity is detected. When this happens, the processor is “instantly” converted to full speed
for a programmed duration. System activities in the
CS5530 are asserted as: any unmasked IRQ, accessing
Port 061h, any asserted SMI, and/or accessing the video
port.
APM, if available, is used primarily by CPU power management since the operating system is most capable of
reporting the Idle condition. Additional resources provided
by the CS5530 supplement APM by monitoring external
activity and power managing the CPU based on the system demands. The two processes for power managing the
CPU are Suspend Modulation and 3 Volt Suspend.
Since the graphics controller is integrated in the GXLV
processor, the indication of video activity is sent to the
CS5530 via the serial link (see Section 3.1.2 “PSERIAL
Pin Interface” on page 44 for more information on serial
link) and is automatically decoded. Video activity is
defined as any access to the VGA register space, the
VGA frame buffer, the graphics accelerator control registers and the configured graphics frame buffer.
3.4.2.1 Suspend Modulation
Suspend Modulation works by asserting and de-asserting
the SUSP# pin to the CPU for configurable durations.
When the SUSP# pin is asserted to the processor, the
processor enters an Idle state during which time the
power consumption is significantly reduced. Even though
the PCI clock is still running, the processor stops clocks to
its core when SUSP# is asserted. By modulating the
SUSP# pin, a reduced frequency of operation is achieved.
The automatic speedup events (video and IRQ) for Suspend Modulation should be used together with softwarecontrolled speedup registers for major I/O events such as
any access to the floppy disk controller, hard disk drive, or
parallel/serial ports, since these are indications of major
system activities. When major I/O events occur, Suspend
Modulation should be temporarily disabled using the procedures described in the Power Management Registers in
the following subsections.
The Suspend Modulation feature works by assuming that
the processor is idle unless external activity indicates otherwise. This approach effectively slows down the processor until external activity indicates a need to run at full
speed, thereby reducing power consumption. This
approach is the opposite of that taken by most power
management schemes in the industry, which run the system at full speed until a period of inactivity is detected,
and then slows down. Suspend Modulation, the more
aggressive approach, yields lower power consumption.
If a bus master (Ultra DMA/33, Audio, USB) request
(REQ#) occurs, the processor automatically deasserts
SUSPA# and grants (GNT#) the bus to the requesting bus
master. When the bus master deasserts REQ#, SUSPA#
reasserts. This does not directly affect the Suspend Modulation programming.
Suspend Modulation serves as the primary CPU power
management mechanism when APM is not present. It
also acts as a backup for situations where APM does not
correctly detect an Idle condition in the system.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Configuring Suspend Modulation
Control of the Suspend Modulation feature is accomplished using the Suspend Modulation OFF Count Register, the Suspend Modulation ON Count Register, and the
Suspend Configuration Register (F0 Index 94h, 95h, and
96h, respectively).
The IRQ and Video Speedup Timer Count registers (F0
Index 8Ch and 8Dh) configure the amount of time which
Suspend Modulation is disabled when the respective
events occur.
SMI Speedup Disable
If the Suspend Modulation feature is being used for CPU
power management, the occurrence of an SMI disables
the Suspend Modulation function so that the system operates at full speed while in SMM. There are two methods
used to invoke this via bit 1 of the Suspend Configuration
Register.
The Power Management Enable Register 1 (F0 Index
80h) contains the global power management enable bit
(bit 0), as well as the enables for the individual activity
speedup timers. The global power management bit must
be enabled for Suspend Modulation and all other power
management resources to function.
Bit 0 of the Suspend Configuration Register (F0 Index
96h) enables the Suspend Modulation feature. Bit 1 controls how SMI events affect the Suspend Modulation feature. In general this bit should be set to a 1, which causes
SMIs to disable Suspend Modulation until it is re-enabled
by the SMI handler.
If F0 Index 96h[1] = 0: Use the IRQ Speedup Timer
(F0 Index 8Ch) to temporarily disable Suspend
Modulation when an SMI occurs.
2)
If F0 Index 96h[1] = 1: Disable Suspend Modulation
when an SMI occurs until a read to the SMI Speedup
Disable Register (F1BAR+Memory Offset 08h).
The SMI Speedup Disable Register prevents VSA technology software from entering Suspend Modulation while
operating in SMM. The data read from this register can be
ignored. If the Suspend Modulation feature is disabled,
reading this I/O location has no effect.
The Suspend Modulation OFF and ON Count Registers
(F0 Index 94h and 95h) control two 8-bit counters that represent the number of 32 µs intervals that the SUSP# pin is
asserted and then deasserted to the processor. These
counters define a ratio which is the effective frequency of
operation of the system while Suspend Modulation is
enabled.
Feff = FGX86 x
1)
Table 3-13 shows the bit formats of the Suspend Modulation related registers.
On Count
On Count + Off Count
Table 3-13. Suspend Modulation Related Registers
Bit
Description
F1BAR+Memory Offset 08h-09h
15:0
SMI Speedup Disable Register (Read to Enable)
Reset Value = 0000h
SMI Speedup Disable: If bit 1 in the Suspend Configuration Register is set (F0 Index 96h[1] = 1), a read of this register
invokes the SMI handler to re-enable Suspend Modulation.
The data read from this register can be ignored. If the Suspend Modulation feature is disabled, reading this location has
no effect.
F0 Index 80h
4
Power Management Enable Register 1 (R/W)
Reset Value = 00h
Video Speedup: Any video activity, as decoded from the serial connection (PSERIAL register, bit 0) from the GXLV processor disables clock throttling (via SUSP#/SUSPA# handshake) for a configurable duration when system is power managed using CPU Suspend Modulation. 0 = Disable; 1 = Enable.
The duration of the speedup is configured in the Video Speedup Timer Count Register (F0 Index 8Dh). Detection of an
external VGA access (3Bx, 3, 3Dx and A000h-B7FFh) on the PCI bus is also supported. This configuration is non-standard, but it does allow the power management routines to support an external VGA chip.
3
IRQ Speedup: Any unmasked IRQ (per I/O Port 021h/0A1h) or SMI disables clock throttling (via SUSP#/SUSPA# handshake) for a configurable duration when system is power managed using CPU Suspend Modulation:
0 = Disable; 1 = Enable.
The duration of the speedup is configured in the IRQ Speedup Timer Count Register (F0 Index 8Ch).
0
Power Management: Global power management: 0 = Disable; 1 = Enabled.
This bit must be set (1) immediately after POST for power management resources to function.
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Table 3-13. Suspend Modulation Related Registers (Continued)
Bit
Description
F0 Index 8Ch
7:0
IRQ Speedup Timer Count Register (R/W)
Reset Value = 00h
IRQ Speedup Timer Count: This field represents the load value for the IRQ speedup timer. It is loaded into the counter
when Suspend Modulation is enabled (F0 Index 96[0] = 1) and an INTR or an access to I/O Port 061h occurs. When the
event occurs, the Suspend Modulation logic is inhibited, permitting full performance operation of the CPU. Upon expiration, no SMI is generated; the Suspend Modulation begins again. The IRQ speedup timer’s timebase is 1 ms.
This speedup mechanism allows instantaneous response to system interrupts for full-speed interrupt processing. A typical value here would be 2 to 4 ms.
F0 Index 8Dh
7:0
Video Speedup Timer Count Register (R/W)
Reset Value = 00h
Video Speedup Timer Count: This field represents the load value for the Video speedup timer. It is loaded into the
counter when Suspend Modulation is enabled (F0 Index 96[0] = 1) and any access to the graphics controller occurs.
When a video access occurs, the Suspend Modulation logic is inhibited, permitting full-performance operation of the
CPU. Upon expiration, no SMI is generated; the Suspend Modulation begins again. The video speedup timer’s timebase
is 1 ms.
This speedup mechanism allows instantaneous response to video activity for full speed during video processing calculations. A typical value here would be 50 to 100 ms.
F0 Index 94h
7:0
Suspend Modulation OFF Count Register (R/W)
Reset Value = 00h
Suspend Signal Deasserted Count: This 8-bit counter represents the number of 32 µs intervals that the SUSP#
pin is deasserted to the processor. This counter, together with the Suspend Modulation ON Count Register (F0 Index
95h), perform the Suspend Modulation function for CPU power management. The ratio of the on-to-off count sets up an
effective (emulated) clock frequency, allowing the power manager to reduce CPU power consumption.
This counter is prematurely reset if an enabled speedup event occurs. The speedup events are IRQ speedups and video
speedups.
F0 Index 95h
7:0
Suspend Modulation ON Count Register (R/W)
Reset Value = 00h
Suspend Signal Asserted Count: This 8-bit counter represents the number of 32 µs intervals that the SUSP# pin is
asserted. This counter, together with the Suspend Modulation OFF Count Register (F0 Index 94h), perform the Suspend
Modulation function for CPU power management. The ratio of the on-to-off count sets up an effective (emulated) clock
frequency, allowing the power manager to reduce CPU power consumption.
This counter is prematurely reset if an enabled speedup event occurs. The speedup events are IRQ speedups and video
speedups.
F0 Index 96h
7:3
Suspend Configuration Register (R/W)
Reset Value = 00h
Reserved: Set to 0.
2
Suspend Mode Configuration: “Special 3 Volt Suspend” mode to support powering down the GXLV processor during
Suspend: 0 = Disable; 1 = Enable.
1
SMI Speedup Configuration: Selects how Suspend Modulation function reacts when an SMI occurs:
0 = Use the IRQ Speedup Timer Count Register (F0 Index 8Ch) to temporarily disable Suspend Modulation when an SMI
occurs.
1 = Disable Suspend Modulation when an SMI occurs until a read to the SMI Speedup Disable Register (F1BAR+Memory
Offset 08h).
The purpose of this bit is to disable Suspend Modulation while the CPU is in the System Management Mode so that VSA
and Power Management operations occur at full speed. Two methods for accomplishing this are either to map the SMI
into the IRQ Speedup Timer Count Register (F0 Index 8Ch), or to have the SMI disable Suspend Modulation until the SMI
handler reads the SMI Speedup Disable Register (F1BAR+Memory Offset 08h). The latter is the preferred method. The
IRQ speedup method is provided for software compatibility with earlier revisions of the CS5530. This bit has no effect if
the Suspend Modulation feature is disabled (bit 0 = 0).
0
Suspend Modulation Feature Enable: Suspend Modulation feature: 0 = Disable; 1 = Enable.
When enabled, the SUSP# pin is asserted and deasserted for the durations programmed in the
Suspend Modulation OFF/ON Count Registers (F0 Index 94h/95h).
F0 Index A8h-A9h
15:0
Revision 4.1
Video Overflow Count Register (R/W)
Reset Value = 0000h
Video Overflow Count: Each time the Video Speedup Counter (F0 Index 8Dh) is triggered, a 100 ms timer is started. If
the 100 ms timer expires before the Video Speedup Counter lapses, the Video Overflow Count Register increments and
the 100 ms timer re-triggers. Software clears the overflow register when new evaluations are to begin. The count contained in this register may be combined with other data to determine the type of video accesses present in the system.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.4.2.2 3 Volt Suspend
The CS5530 supports the stopping of the CPU and system clocks for a 3 Volt Suspend state. If appropriately configured, via the Clock Stop Control Register (F0 Index
BCh), the CS5530 asserts the SUSP_3V pin after it has
gone through the SUSP#/SUSPA# handshake. The
SUSP_3V pin is a state indicator, indicating that the system is in a low-activity state and Suspend Modulation is
active. This indicator can be used to put the system into a
low-power state (the system clock can be turned off).
deassert the SUSP_3V pin, restarting the system clocks.
As the CPU or other device might include a PLL, the
CS5530 holds SUSP# active for a pre-programmed
period of delay (the PLL re-sync delay) that varies from 0
to 15 ms. After this period has expired, the CS5530 deasserts SUSP#, stopping Suspend. SMI# is held active for
the entire period, so that the CPU reenters SMM when the
clocks are restarted.
Note:
The SUSP_3V pin is intended to be connected to the output enable of a clock generator or buffer chip, so that the
clocks to the CPU and the CS5530 (and most other system devices) will be stopped. The CS5530 continues to
decrement all of its device timers and respond to external
SMI interrupts after the input clock has been stopped, as
long as the 32 KHz clock continues to oscillate. Any SMI
event or unmasked interrupt pin causes the CS5530 to
The SUSP_3V pin can be active either high or
low. The pin is an input during POR, and is sampled to determine its inactive state. This allows a
designer to match the active state of SUSP_3V to
the inactive state for a clock driver output enable
with a pull-up or pull-down resistor.
The bit formats for the Clock Stop Control Register are
given in Table 3-14.
Table 3-14. Clock Stop Control Register
Bit
Description
F0 Index BCh
7:4
Clock Stop Control Register (R/W)
Reset Value = 00h
PLL Delay: The programmed value in this field sets the delay (in milliseconds) after a break event occurs before the
SUSP# pin is deasserted to the CPU. This delay is designed to allow the clock chip and CPU PLL to stabilize before starting execution. This delay is only invoked if the STP_CLK bit (bit 0) was set.
The four-bit field allows values from 0 to 15 ms.
0000 = 0 ms
0001 = 1 ms
0010 = 2 ms
0011 = 3 ms
3:1
0
Notes:
0100 = 4 ms
0101 = 5 ms
0110 = 6 ms
0111 = 7 ms
1000 = 8 ms
1001 = 9 ms
1010 = 10 ms
1011 = 11 ms
1100 = 12 ms
1101 = 13 ms
1110 = 14 ms
1111 = 15 ms
Reserved: Set to 0.
CPU Clock Stop: 0 = Normal SUSP#/ SUSPA# handshake; 1 = Full system Suspend.
This register configures the CS5530 to support a 3 Volt Suspend. Setting bit 0 causes the SUSP_3V pin to assert after
the appropriate conditions, stopping the system clocks. A delay of 0 to 15 ms is programmable (bits 7:4) to allow for a
delay for the clock chip and CPU PLL to stabilize when an event Resumes the system.
A write to the CPU Suspend Command Register (F0 Index AEh) with bit 0 written as:
0 = SUSP#/SUSPA# handshake occurs. The CPU is put into a low-power state, and the system clocks are not stopped.
When a break/resume event occurs, it releases the CPU halt condition.
1 = SUSP#/SUSPA# handshake occurs and the SUSP_3V pin is asserted, thus invoking a full system Suspend (both
CPU and system clocks are stopped). When a break event occurs, the SUSP_3V pin will deassert, the PLL delay programmed in bits [7:4] will be invoked which allows the clock chip and CPU PLL to stabilize before deasserting the
SUSP# pin.
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3.4.2.3 Save-To-Disk
Save-to-Disk is supported by the CS5530. In this state,
the power is typically removed from the CS5530, causing
the state of the legacy peripheral devices to be lost.
Shadow registers are provided for the devices which
allows their state to be saved prior to removing power.
This is necessary because the legacy AT peripheral
devices used several write only registers. In order to
restore the exact state of these devices on resume, the
write only register values are “shadowed” so that the values can be saved by the Power Management Software.
The PC/AT compatible floppy port is not part of the
CS5530. However, it is expected that one will be attached
on the ISA bus in a SuperI/O or by some other means.
Some of the FDC registers are shadowed because they
cannot be safely read. They are shown in Table 3-15.
Additional shadow registers for other functions are
described in:
•
•
•
•
Table 3-39 "DMA Shadow Register" on page 93
Table 3-41 "PIT Shadow Register" on page 95
Table 3-44 "PIC Shadow Register" on page 97
Table 3-52 "Real-Time Clock Registers" on page 104
Table 3-15. Power Management Shadow Registers
Bit
Description
F0 Index B4h
7:0
Floppy Port 3F2h Shadow Register (RO)
Reset Value = 00h
Floppy Port 3F2h Shadow (Read Only): Last written value of I/O Port 3F2h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
F0 Index B5h
7:0
Floppy Port 3F7h Shadow Register (RO)
Reset Value = 00h
Floppy Port 3F7h Shadow (Read Only): Last written value of I/O Port 3F7h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
F0 Index B6h
7:0
Floppy Port 1F2h Shadow Register (RO)
Reset Value = 00h
Floppy Port 1F2h Shadow (Read Only): Last written value of I/O Port 1F2h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
F0 Index B7h
7:0
Floppy Port 1F7h Shadow Register (RO)
Reset Value = 00h
Floppy Port 1F7h Shadow (Read Only): Last written value of I/O Port 1F7h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
Revision 4.1
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.4.3 Peripheral Power Management
The CS5530 provides peripheral power management
using a combination of device idle timers, address traps,
and general purpose I/O pins. Idle timers are used in conjunction with traps to support powering down peripheral
devices. Eight programmable GPIO (general purpose I/O)
pins are included for external device power control as well
as other functions. All I/O addresses are decoded in 16
bits. All memory addresses are decoded in 32 bits.
The idle timers are 16-bit countdown timers with a 1 second time base, providing a time-out range of 1 to 65536
seconds (1092 minutes) (18 hours).
When the idle timer count registers are loaded with a nonzero value and enabled, the timers decrement until one of
two possibilities happens: a bus cycle occurs at that I/O or
memory range, or the timer decrements to zero.
If a bus cycle occurs, the timer is reloaded and begins
decrementing again. If the timer decrements to zero, and
power management is enabled (F0 Index 80h[0] = 1), the
timer generates an SMI.
3.4.3.1 Device Idle Timers and Traps
Idle timers are used to power manage a peripheral by
determining when the peripheral has been inactive for a
specified period of time, and removing power from the
peripheral at the end of that time period.
When an idle timer generates an SMI, the SMI handler
manages the peripheral power, disables the timer, and
enables the trap. The next time an event occurs, the trap
generates an SMI. This time, the SMI handler applies
power to the peripheral, resets the timer, and disables the
trap.
Idle timers are provided for the commonly-used peripherals (FDC, IDE, parallel/serial ports, and mouse/keyboard).
In addition, there are three user-defined timers that can
be configured for either I/O or memory ranges.
Tables 3-16 through 3-24 show the device associated idle
timers and traps programming bits.
Table 3-16. Power Management Global Enabling Bits
Bit
Description
F0 Index 80h
2
Power Management Enable Register 1 (R/W)
Reset Value = 00h
Traps: Globally enable all power management device I/O traps: 0 = Disable; 1 = Enable.
This excludes the audio I/O traps. They are enabled at F3BAR+Memory Offset 18h.
1
Idle Timers: Globally enable all power management device idle timers: 0 = Disable; 1 = Enable.
Note, disable at this level does not reload the timers on the enable. The timers are disabled at their current counts.
This bit has no affect on the Suspend Modulation OFF/ON Timers (F0 Index 94h/95h).
0
Power Management: Global power management: 0 = Disable; 1 = Enabled.
This bit must be set (1) immediately after POST for power management resources to function.
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Table 3-17. Keyboard/Mouse Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
3
Power Management Enable Register 2 (R/W)
Reset Value = 00h
Keyboard/Mouse Idle Timer Enable: Turn on Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) and generate
an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[3].
F0 Index 82h
3
Power Management Enable Register 3 (R/W)
Reset Value = 00h
Keyboard/Mouse Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[3].
F0 Index 93h
Miscellaneous Device Control Register (R/W)
Reset Value = 00h
1
Mouse on Serial Enable: Mouse is present on a Serial Port: 0 = No; 1 = Yes. (Note)
0
Mouse Port Select: Selects which serial port the mouse is attached to: 0 = COM1; 1 = COM2. (Note)
Note: Bits 1 and 0 - If a mouse is attached to a serial port (bit 1 = 1), that port is removed from the serial device list being used to
monitor serial port access for power management purposes and added to the keyboard/mouse decode. This is done because
a mouse, along with the keyboard, is considered an input device and is used only to determine when to blank the screen.
These bits determine the decode used for the Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) as well as the Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch).
F0 Index 9Eh-9Fh
15:0
Keyboard / Mouse Idle Timer Count Register (R/W)
Reset Value = 0000h
Keyboard / Mouse Idle Timer Count: This idle timer determines when the keyboard and mouse are not in use so that
the LCD screen can be blanked. The 16-bit value programmed here represents the period of inactivity for these ports
after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to either the keyboard or mouse I/O address spaces, including the mouse serial port address space when
a mouse is enabled on a serial port. The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[3] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[3].
Revision 4.1
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-18. Parallel/Serial Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
2
Power Management Enable Register 2 (R/W)
Reset Value = 00h
Parallel/Serial Idle Timer Enable: Turn on Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch) and generate
an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[2].
F0 Index 82h
2
Power Management Enable Register 3 (R/W)
Reset Value = 00h
Parallel/Serial Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[2].
F0 Index 93h
Miscellaneous Device Control Register (R/W)
Reset Value = 00h
1
Mouse on Serial Enable: Mouse is present on a Serial Port: 0 = No; 1 = Yes. (Note)
0
Mouse Port Select: Selects which serial port the mouse is attached to: 0 = COM1; 1 = COM2. (Note)
Note: Bits 1 and 0 - If a mouse is attached to a serial port (bit 1 = 1), that port is removed from the serial device list being used to
monitor serial port access for power management purposes and added to the keyboard/mouse decode. This is done because
a mouse, along with the keyboard, is considered an input device and is used only to determine when to blank the screen.
These bits determine the decode used for the Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) as well as the Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch).
F0 Index 9Ch-9Dh
15:0
Parallel / Serial Idle Timer Count Register (R/W)
Reset Value = 0000h
Parallel / Serial Idle Timer Count: This idle timer is used to determine when the parallel and serial ports are not in use
so that the ports can be power managed. The 16-bit value programmed here represents the period of inactivity for these
ports after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to the parallel (LPT) or serial (COM) I/O address spaces. If the mouse is enabled on a serial port, that port
is not considered here. The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[2] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[2].
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Table 3-19. Floppy Disk Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
1
Power Management Enable Register 2 (R/W)
Reset Value = 00h
Floppy Disk Idle Timer Enable: Turn on Floppy Disk Idle Timer Count Register (F0 Index 9Ah) and generate an SMI
when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h,
Secondary floppy disk: I/O Port 372h-375h, 377h
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[1].
F0 Index 82h
1
Power Management Enable Register 3 (R/W)
Reset Value = 00h
Floppy Disk Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h,
Secondary floppy disk: I/O Port 372h-375h, 377h
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[1].
F0 Index 93h
7
Reset Value = 00h
Floppy Drive Port Select: All system resources used to power manage the floppy drive use the primary or secondary
FDC addresses for decode: 0 = Secondary; 1 = Primary.
F0 Index 9Ah-9Bh
15:0
Miscellaneous Device Control Register (R/W)
Floppy Disk Idle Timer Count Register (R/W)
Reset Value = 0000h
Floppy Disk Idle Timer Count: This idle timer is used to determine when the floppy disk drive is not in use so that it can
be powered down. The 16-bit value programmed here represents the period of floppy disk drive inactivity after which the
system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access occurs to the
configured floppy drive’s data port (I/O Port 3F5h or 375h). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[1] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[1].
Revision 4.1
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-20. Primary Hard Disk Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
0
Power Management Enable Register 2 (R/W)
Reset Value = 00h
Primary Hard Disk Idle Timer Enable: Turn on Primary Hard Disk Idle Timer Count Register (F0 Index 98h) and generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges selected in F0 Index 93h[5], the timer is reloaded with the programmed count.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[0].
F0 Index 82h
0
Power Management Enable Register 3 (R/W)
Reset Value = 00h
Primary Hard Disk Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges selected in F0 Index 93h[5], an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[0].
F0 Index 93h
5
Miscellaneous Device Control Register (R/W)
Reset Value = 00h
Partial Primary Hard Drive Decode: This bit is used to restrict the addresses which are decoded as primary hard drive
accesses.
0 = Power management monitors all reads and writes I/O Port 1F0h-1F7h, 3F6h-3F7h (excludes writes to 3F7h)
1 = Power management monitors only writes to I/O Port 1F6h and 1F7h
F0 Index 98h-99h
15:0
Primary Hard Disk Idle Timer Count Register (R/W)
Reset Value = 0000h
Primary Hard Disk Idle Timer Count: This idle timer is used to determine when the primary hard disk is not in use so
that it can be powered down. The 16-bit value programmed here represents the period of primary hard disk inactivity after
which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access
occurs to the configured primary hard disk’s data port (configured in F0 Index 93h[5]). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[0] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[0].
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Table 3-21. Secondary Hard Disk Idle Timer and Trap Related Registers
Bit
Description
F0 Index 83h
7
Power Management Enable Register 4 (R/W)
Reset Value = 00h
Secondary Hard Disk Idle Timer Enable: Turn on Secondary Hard Disk Idle Timer Count Register (F0 Index ACh) and
generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges selected in F0 Index 93h[4], the timer is reloaded with the programmed count.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[4].
6
Secondary Hard Disk Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges selected in F0 Index 93h[4], an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[5].
F0 Index 93h
4
Miscellaneous Device Control Register (R/W)
Reset Value = 00h
Partial Secondary Hard Drive Decode: This bit is used to restrict the addresses which are decoded as secondary hard
drive accesses.
0 = Power management monitors all reads and writes I/O Port 170h-177h, 376h-377h (excludes writes to 377h)
1 = Power management monitors only writes to I/O Port 176h and 177h
F0 Index ACh-ADh
15:0
Secondary Hard Disk Idle Timer Count Register (R/W)
Reset Value = 0000h
Secondary Hard Disk Idle Timer Count: This idle timer is used to determine when the secondary hard disk is not in use
so that it can be powered down. The 16-bit value programmed here represents the period of secondary hard disk inactivity after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to the configured secondary hard disk’s data port (configured in F0 Index 93h[4]). The counter uses a 1
second timebase.
To enable this timer set F0 Index 83h[7] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[4].
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-22. User Defined Device 1 (UDEF1) Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
4
Power Management Enable Register 4 (R/W)
Reset Value = 00h
User Defined Device 1 (UDEF1) Idle Timer Enable: Turn on UDEF1 Idle Timer Count Register (F0 Index A0h) and generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the programmed address range the timer is reloaded with the programmed count.
UDEF1 address programming is at F0 Index C0h (base address register) and CCh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[4].
F0 Index 82h
4
Power Management Enable Register 3 (R/W)
Reset Value = 00h
User Defined Device 1 (UDEF1) Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the programmed address range an SMI is generated. UDEF1 address programming is at F0 Index C0h (base address register), and CCh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[2].
F0 Index A0h-A1h
15:0
User Defined Device 1 Idle Timer Count Register (R/W)
Reset Value = 0000h
User Defined Device 1 (UDEF1) Idle Timer Count: This idle timer determines when the device configured as UDEF1 is
not in use so that it can be power managed. The 16-bit value programmed here represents the period of inactivity for this
device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to memory or I/O address space configured in F0 Index C0h (base address register) and F0 Index CCh
(control register). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[4] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[4].
F0 Index C0h-C3h
31:0
User Defined Device 1 Base Address Register (R/W)
User Defined Device 1 (UDEF1) Base Address [31:0]: This 32-bit register supports power management (trap and idle
timer resources) for a PCMCIA slot or some other device in the system. The value written is used as the address comparator for the device trap/timer logic. The device can be memory or I/O mapped (configured in F0 Index CCh).
F0 Index CCh
7
6:0
Reset Value = 00000000h
User Defined Device 1 Control Register (R/W)
Reset Value = 00h
Memory or I/O Mapped: User Defined Device 1 is: 0 = I/O; 1 = Memory.
Mask:
If bit 7 = 0 (I/O):
Bit 6
0 = Disable write cycle tracking
1 = Enable write cycle tracking
Bit 5
0 = Disable read cycle tracking
1 = Enable read cycle tracking
Bits 4:0
Mask for address bits A[4:0]
If bit 7 = 1 (M/IO):
Bits 6:0
Mask for address memory bits A[15:9] (512 bytes min. and 64 KB max.) and A[8:0] are ignored.
Note: A "1" in a mask bit means that the address bit is ignored for comparison.
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Table 3-23. User Defined Device 2 (UDEF2) Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
5
Power Management Enable Register 4 (R/W)
Reset Value = 00h
User Defined Device 2 (UDEF2) Idle Timer Enable: Turn on UDEF2 Idle Timer Count Register (F0 Index A2h) and generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the programmed address range the timer is reloaded with the programmed count.
UDEF2 address programming is at F0 Index C4h (base address register) and CDh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[5].
F0 Index 82h
5
Power Management Enable Register 3 (R/W)
Reset Value = 00h
User Defined Device 2 (UDEF2) Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the programmed address range an SMI is generated. UDEF2 address programming is at F0 Index C4h (base address register) and CDh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[3].
F0 Index A2h-A3h
15:0
User Defined Device 2 Idle Timer Count Register (R/W)
Reset Value = 0000h
User Defined Device 2 (UDEF2) Idle Timer Count: This idle timer determines when the device configured as UDEF2 is
not in use so that it can be power managed. The 16-bit value programmed here represents the period of inactivity for this
device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to memory or I/O address space configured in the F0 Index C4h (base address register) and F0 Index CDh
(control register). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[5] = 1.
Top level SMI status reporting is at F1BAR+Memory Offset 00h/02h[0] and secondary level SMI status reporting is at F0
Index 85h/F5h[5].
F0 Index C4h-C7h
31:0
User Defined Device 2 Base Address Register (R/W)
User Defined Device 2 (UDEF2) Base Address [31:0]: This 32-bit register supports power management (trap and idle
timer resources) for a PCMCIA slot or some other device in the system. The value written is used as the address comparator for the device trap/timer logic. The device can be memory or I/O mapped (configured in F0 Index CDh).
F0 Index CDh
7
6:0
Reset Value = 00000000h
User Defined Device 2 Control Register (R/W)
Reset Value = 00h
Memory or I/O Mapped: User Defined Device 2 is: 0 = I/O; 1 = Memory.
Mask:
If bit 7 = 0 (I/O):
Bit 6
0 = Disable write cycle tracking
1 = Enable write cycle tracking
Bit 5
0 = Disable read cycle tracking
1 = Enable read cycle tracking
Bits 4:0
Mask for address bits A[4:0]
If bit 7 = 1 (M/IO):
Bits 6:0
Mask for address memory bits A[15:9] (512 bytes min. and 64 KB max.) and A[8:0] are ignored.
Note: A "1" in a mask bit means that the address bit is ignored for comparison.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-24. User Defined Device 3 (UDEF3) Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
6
Power Management Enable Register 4 (R/W)
Reset Value = 00h
User Defined Device 3 (UDEF3) Idle Timer Enable: Turn on UDEF3 Idle Timer Count Register (F0 Index A4h) and generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the programmed address range the timer is reloaded with the programmed count.
UDEF3 address programming is at F0 Index C8h (base address register) and CEh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[6].
F0 Index 82h
6
Power Management Enable Register 3 (R/W)
Reset Value = 00h
User Defined Device 3 (UDEF3) Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the programmed address range an SMI is generated. UDEF3 address programming is at F0 Index C8h (base address register) and CEh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[4].
F0 Index A4h-A5h
15:0
User Defined Device 3 Idle Timer Count Register (R/W)
Reset Value = 0000h
User Defined Device 3 (UDEF3) Idle Timer Count: This idle timer determines when the device configured as UDEF3 is
not in use so that it can be power managed. The 16-bit value programmed here represents the period of inactivity for this
device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to memory or I/O address space configured in the UDEF3 Base Address Register (F0 Index C8h) and
UDEF3 Control Register (F0 Index CEh). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[6] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[6].
F0 Index C8h-CBh
31:0
User Defined Device 3 Base Address Register (R/W)
User Defined Device 3 (UDEF3) Base Address [31:0]: This 32-bit register supports power management (trap and idle
timer resources) for a PCMCIA slot or some other device in the system. The value written is used as the address comparator for the device trap/timer logic. The device can be memory or I/O mapped (configured in F0 Index CEh).
F0 Index CEh
7
6:0
Reset Value = 00000000h
User Defined Device 3 Control Register (R/W)
Reset Value = 00h
Memory or I/O Mapped: User Defined Device 3 is: 0 = I/O; 1 = Memory.
Mask:
If bit 7 = 0 (I/O):
Bit 6
0 = Disable write cycle tracking
1 = Enable write cycle tracking
Bit 5
0 = Disable read cycle tracking
1 = Enable read cycle tracking
Bits 4:0
Mask for address bits A[4:0]
If bit 7 = 1 (M/IO):
Bits 6:0
Mask for address memory bits A[15:9] (512 bytes min. and 64 KB max.) and A[8:0] are ignored.
Note: A "1" in a mask bit means that the address bit is ignored for comparison.
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Although not considered as device idle timers, two additional timers are provided by the CS5530. The Video Idle
Timer used for Suspend-determination and the VGA
Timer used for SoftVGA.
These timers and their associated programming bits are
listed in Tables 3-25 and 3-26.
Table 3-25. Video Idle Timer and Trap Related Registers
Bit
Description
F0 Index 81h
7
Power Management Enable Register 2 (R/W)
Reset Value = 00h
Video Access Idle Timer Enable: Turn on Video Idle Timer Count Register (F0 Index A6h) and generate an SMI when
the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the video address range (sets bit 0 of the GXLV processor’s PSERIAL Register) the timer is
reloaded with the programmed count.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[7].
F0 Index 82h
7
Power Management Enable Register 3 (R/W)
Reset Value = 00h
Video Access Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the video address range (sets bit 0 of the GXLV processor’s PSERIAL Register) an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[7].
F0 Index A6h-A7h
15:0
Video Idle Timer Count Register (R/W)
Reset Value = 0000h
Video Idle Timer Count: This idle timer determines when the graphics subsystem has been idle as part of the
Suspend-determination algorithm. The 16-bit value programmed here represents the period of video inactivity after which
the system is alerted via an SMI. The count in this timer is automatically reset whenever an access occurs to the graphics
controller space. The counter uses a 1 second timebase.
In a GXLV processor based system the graphics controller is embedded in the CPU, so video activity is communicated to
the CS5530 via the serial connection (PSERIAL register, bit 0) from the processor. The CS5530 also detects accesses to
standard VGA space on PCI (3Bxh, 3h, 3Dxh and A000h-B7FFh) in the event an external VGA controller is being used.
To enable this timer set F0 Index 81h[7] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[7].
Table 3-26. VGA Timer Related Registers
Bit
Index 83h
3
Description
Power Management Enable Register 4 (R/W)
Reset Value = 00h
VGA Timer Enable: Turn on VGA Timer and generate an SMI when the timer reaches 0: 0 = Disable; 1 = Enable
If an access occurs in the programmed address range the timer is reloaded with the programmed count. VGA Timer programming is at F0 Index 8Eh and F0 Index 8Bh[6]
SMI Status reporting is at F1BAR+Memory Offset 00h/02h[6] (only).
Index 8Bh
6
General Purpose Timer 2 Control Register (R/W)
Index 8Eh
7:0
Reset Value = 00h
VGA Timer Base: Selects timebase for VGA Timer Register (F0 Index 8Eh): 0 = 1 ms; 1 = 32 µs.
VGA Timer Count Register (R/W)
Reset Value = 00h
VGA Timer Load Value: This field represents the load value for VGA Timer. It is loaded into the counter when the timer
is enabled (F0 Index 83h[3] = 1). The counter is decremented with each clock of the configured timebase (F0 Index
8Bh[6]). Upon expiration of the counter, an SMI is generated and the status is reported in F1BAR+Memory Offset
00h/02h[6] (only). Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new
count value here.
This counter’s timebase is 1 ms.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.4.3.2 General Purpose Timers
The CS5530 contains two general purpose idle timers,
General Purpose Timer 1 (F0 Index 88h) and General
Purpose Timer 2 (F0 Index 8Ah). These two timers are
similar to the Device Idle Timers in that they count down
to zero unless re-triggered, and generate an SMI when
they reach zero. However, these are 8-bit timers instead
of 16 bits, they have a programmable timebase, and the
events which reload these timers are configurable. These
timers are typically used for an indication of system inactivity for Suspend determination.
General Purpose Timer 2 can be re-triggered by a transition on the GPIO7 pin (if GPIO7 is properly configured).
Configuration of the GPIO7 is explained in Section 3.4.3.4
“General Purpose I/O Pins” on page 73.
When a General Purpose Timer is enabled or when an
event reloads the timer, the timer is loaded with the configured count value. Upon expiration of the timer an SMI is
generated and a status flag is set. Once expired, this
counter must be re-initialized by disabling and enabling it.
The timebase for both General Purpose Timers can be
configured as either 1 second (default) or 1 millisecond.
The registers at F0 Index 89h and 8Bh are the control registers for the General Purpose Timers. Table 3-27 show
the bit formats for these registers.
General Purpose Timer 1 can be re-triggered by activity to
any of the configured user defined devices, keyboard and
mouse, parallel and serial, floppy disk, or hard disk.
Table 3-27. General Purpose Timers and Control Registers
Bit
Description
F0 Index 88h
7:0
General Purpose Timer 1 Count Register (R/W)
Reset Value = 00h
General Purpose Timer 1 Count: This field represents the load value for GP Timer 1. This value can represent either an
8-bit or 16-bit counter (selected in F0 Index 8Bh[4]). It is loaded into the counter when the timer is enabled (F0 Index
83h[0] =1). Once enabled, an enabled event (configured in F0 Index 89h[6:0]) reloads the timer.
The counter is decremented with each clock of the configured timebase. Upon expiration of the counter, an SMI is generated and the top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9]. The second level SMI status is
reported at F1BAR+Memory Offset 04h/06h[0]).
Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new count value here.
This counter’s timebase can be configured as 1 msec or 1 sec at F0 Index 89h[7].
F0 Index 89h
7
6
General Purpose Timer 1 Control Register (R/W)
Reset Value = 00h
Timebase for General Purpose Timer 1: Selects timebase for GP Timer 1 (F0 Index 88h): 0 = 1 sec; 1 = 1 msec.
Re-trigger General Purpose Timer 1 on User Defined Device 3 (UDEF3) Activity: 0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF3 reloads GP Timer 1. UDEF3 address
programming is at F0 Index C8h (base address register) and CEh (control register).
5
Re-trigger General Purpose Timer 1 on User Defined Device 2 (UDEF2) Activity: 0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF2 reloads GP Timer 1. UDEF2 address
programming is at F0 Index C4h (base address register) and CDh (control register).
4
Re-trigger General Purpose Timer 1 on User Defined Device 1 (UDEF1) Activity: 0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF1 reloads GP Timer 1. UDEF1 address
programming is at F0 Index C0h (base address register) and CCh (control register)
3
Re-trigger General Purpose Timer 1 on Keyboard or Mouse Activity: 0 = Disable; 1 = Enable
Any access to the keyboard or mouse I/O address range (listed below) reloads GP Timer 1.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
2
Re-trigger General Purpose Timer 1 on Parallel/Serial Port Activity: 0 = Disable; 1 = Enable.
Any access to the parallel or serial port I/O address range (listed below) reloads the GP Timer 1.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
1
Re-trigger General Purpose Timer 1 on Floppy Disk Activity: 0 = Disable; 1 = Enable.
Any access to the floppy disk drive address ranges (listed below) reloads GP Timer 1.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h
Secondary floppy disk: I/O Port 372h-375h, 377h
The active floppy drive is configured via F0 Index 93h[7].
0
Re-trigger General Purpose Timer 1 on Primary Hard Disk Activity: 0 = Disable; 1 = Enable.
Any access to the primary hard disk drive address range selected in F0 Index 93h[5] reloads GP Timer 1.
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Table 3-27. General Purpose Timers and Control Registers (Continued)
Bit
Description
F0 Index 8Ah
7:0
General Purpose Timer 2 Count Register (R/W)
Reset Value = 00h
General Purpose Timer 2 Count: This field represents the load value for GP Timer 2. This value can represent either an
8-bit or 16-bit counter (configured in F0 Index 8Bh[5]). It is loaded into the counter when the timer is enabled (F0 Index
83h[1] = 1). Once the timer is enabled and a transition occurs on GPIO7, the timer is re-loaded.
The counter is decremented with each clock of the configured timebase. Upon expiration of the counter, an SMI is generated and the top level of status is F1BAR+Memory Offset 00h/02h[9] and the second level of status is reported in
F1BAR+Memory Offset 04h/06h[1]).
Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new count value here.
For GPIO7 to act as the reload for this counter, it must be enabled as such (F0 Index 8Bh[2]) and be configured as an
input (F0 Index 90h[7]).
This counter’s timebase can be configured as 1 msec or 1 sec in F0 Index 8Bh[3].
F0 Index 8Bh
7
General Purpose Timer 2 Control Register (R/W)
Reset Value = 00h
Re-trigger General Purpose Timer 1 on Secondary Hard Disk Activity: 0 = Disable; 1 = Enable.
Any access to the secondary hard disk drive address range selected in F0 Index 93h[4] reloads GP Timer 1.
6
VGA Timer Base: Selects timebase for VGA Timer Register (F0 Index 8Eh): 0 = 1 ms; 1 = 32 µs.
5
General Purpose Timer 2 Shift: GP Timer 2 is treated as an 8-bit or 16-bit timer: 0 = 8-bit; 1 = 16-bit.
As an 8-bit timer, the count value is loaded into GP Timer 2 Count Register (F0 Index 8Ah).
As a 16-bit timer, the value loaded into GP Timer 2 Count Register is shifted left by eight bits, the lower eight bits become
zero, and this 16-bit value is used as the count for GP Timer 2.
4
General Purpose Timer 1 Shift: GP Timer 1 is treated as an 8-bit or 16-bit timer: 0 = 8-bit; 1 = 16-bit.
As an 8-bit timer, the count value is that loaded into GP Timer 1 Count Register (F0 Index 88h).
As a 16-bit timer, the value loaded into GP Timer 1 Count Register is shifted left by eight bit, the lower eight bits become
zero, and this 16-bit value is used as the count for GP Timer 1.
3
Time Basis for General Purpose Timer 2: Selects timebase for GP Timer 2 (F0 Index 8Ah): 0 = 1 sec; 1 = 1 msec.
2
Re-trigger General Purpose Timer 2 on GPIO7 Pin Transition: A configured transition on the GPIO7 pin reloads GP
Timer 2 (F0 Index 8Ah): 0 = Disable; 1 = Enable.
F0 Index 92h[7] selects whether a rising- or a falling-edge transition acts as a reload. For GPIO7 to work here, it must first
be configured as an input (F0 Index 90h[7] = 0).
1:0
Revision 4.1
Reserved: Set to 0.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.4.3.3 ACPI Timer Register
The ACPI Timer Register (F1BAR+Memory Offset 1Ch or
at I/O Port 121Ch in Silicon Revision 1.3 and above provides the ACPI counter. The counter counts at 14.31818/4
MHz (3.579545 MHz). If SMI generation is enabled (F0
Index 83h[5] = 1), an SMI is generated when bit 23 toggles. Table 3-28 shows the ACPI Timer Count register and
the ACPI Timer SMI enable bit.
Fixed Feature space registers are required to be implemented by all ACPI-compatible hardware. The Fixed Feature registers in the V-ACPI solution are mapped to
normal I/O space starting at offset AC00h. However, the
designer can relocate this register space at compile time,
hereafter referred to as ACPI_BASE. Registers within the
V-ACPI I/O space must only be accessed on their defined
boundaries. For example, BYTE aligned registers must
not be accessed via WORD I/O instructions, WORD
aligned registers must not be accessed as DWORD I/O
instructions, etc.
V-ACPI I/O Register Space
The register space designated as V-ACPI (Virtualized
ACPI) I/O does not physically exist in the CS5530. ACPI
is supported in the CS5530 by virtualizing this register
space. In order for ACPI to be supported, the V-ACPI
module must be included in the BIOS. The register
descriptions that follow, are supplied here for reference
only.
Table 3-29 summarizes the registers available in the VACPI I/O Register Space. The “Reference” column gives a
table and page number where the bit formats for the registers are located.
Table 3-28. ACPI Timer Related Registers/Bits
Bit
Description
F1BAR+Memory Offset 1Ch-1Fh (Note)
ACPI Timer Count Register (RO)
Reset Value = 00FFFFFCh
ACPI_COUNT (Read Only): This read-only register provides the ACPI counter. The counter counts at 14.31818/4 MHz (3.579545
MHz). If SMI generation is enabled via F0 Index 83h[5], an SMI is generated when the MSB toggles. The MSB toggles every 2.343
seconds.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[0].
31:24
Reserved: Always returns 0.
23:0
Counter
Note: The ACPI Timer Count Register is accessible through I/O Port 121Ch in Silicon Revision 1.3 and above.
F0 Index 83h
5
Power Management Enable Register 4 (R/W)
Reset Value = 00h
ACPI Timer SMI: Allow SMI generation for MSB toggles on the ACPI Timer (F1BAR+Memory Offset 1Ch or I/O Port
121Ch in Silicon Revision 1.3 and above): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[0].
Table 3-29. V-ACPI I/O Register Space Summary
Type
00h-03h
R/W
4
4
P_CNT: Processor Control Register
00h
Page 217
04h
RO
1
1
P_LVL2: Enter C2 Power State Register
00h
Page 217
Align
Length
Reset
Value
Reference
(Table 432)
ACPI_
BASE
Name
05h
--
1
1
Reserved
00h
Page 217
06h
R/W
1
1
SMI_CMD: OS/BIOS Requests Register (ACPI enable/disable port)
00h
Page 217
07h
08h-09h
--
1
1
Reserved
00h
Page 218
R/W
2
2
PM1A_STS: PM1A Status Register
00h
Page 218
0Ah-0Bh
R/W
2
2
PM1A_EN: PM1A Enable Register
00h
Page 218
0Ch-0Dh
R/W
4
2
PM1A_CNT: PM1A Control Register
00h
Page 218
0Eh-0Fh
R/W
2
2
SETUP_IDX: Setup Index Register (V-ACPI internal index register)
00h
Page 219
10h-11h
R/W
2
2
GPE0_STS: General Purpose Event 0 Status Register
00h
Page 219
12h-13h
R/W
2
2
GPE0_EN: General Purpose Event 0 Enable Register
00h
Page 220
14h-17h
R/W
4
4
SETUP_DATA: Setup Data Register (V-ACPI internal data register)
00h
Page 220
18h-1Fh
--
8
Reserved -- For Future V-ACPI Implementations
00h
Page 220
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3.4.3.4 General Purpose I/O Pins
The CS5530 provides up to eight GPIO (general purpose
I/O) pins. Five of the pins (GPIO[7:4] and GPIO1) have
alternate functions. Table 3-30 shows the bits used for
GPIO pin function selection.
Data Register 1 (F0 Index 91h) contains the direct values
of the GPIO pins. Write operations are valid only for bits
defined as output. Reads from this register will read the
last written value if the pin is an output.
GPIO Control Register 1 (F0 Index 92h) configures the
operation of the GPIO pins for their various alternate functions. Bits [5:3] set the edge sensitivity for generating an
SMI on the GPIO[2:0] (input) pins respectively. Bits [2:0]
enable the generation of an SMI. Bit 6 enables GPIO6 to
act as the lid switch input. Bit 7 determines which edge
transition will cause the General Purpose Timer 2 (F0
Index 8Ah) to reload.
Each GPIO pin can be configured as an input or output.
GPIO[7:0] can be independently configured to act as
edge-sensitive SMI events. Each pin can be enabled and
configured to be either positive-edge sensitive or negative-edge sensitive. These pins then cause an SMI to be
generated when an appropriate edge condition is
detected. The power management status registers indicate that a GPIO external SMI event has occurred.
Table 3-31 shows the bit formats for the GPIO pin configuration and control registers.
The GPIO Pin Direction Register 1 (F0 Index 90h) selects
whether the GPIO pin is an input or output. The GPIO Pin
Table 3-30. GPIO Pin Function Selection
Bit
Description
F0 Index 43h
USB Shadow Register (R/W)
Reset Value = 03h
6
Enable SA20: Pin AD22 configuration: 0 = GPIO4; 1 = SA20. If F0 Index 43h bit 6 or bit 2 is set to 1, then pin AD22 =
SA20.
2
Enable SA[23:20]: Pins AF23, AE23, AC21, and AD22 configuration: 0 = GPIO[7:4]; 1 = SA[23:20]. If F0 Index 43h bit 6
or bit 2 is set to 1, then pin AD22 = SA20.
F3BAR+Memory Offset 08h-0Bh
21
Codec Status Register (R/W)
Reset Value = 00000000h
Enable SDATA_IN2: Pin AE24 functions as: 0 = GPIO1; 1 = SDATA_IN2.
For this pin to function as SDATA_IN2, it must first be configured as an input (F0 Index 90h[1] = 0).
Table 3-31. GPIO Pin Configuration/Control Registers
Bit
Description
F0 Index 90h
7
GPIO Pin Direction Register 1 (R/W)
Reset Value = 00h
GPIO7 Direction: Selects if GPIO7 is an input or output: 0 = Input; 1 = Output.
6
GPIO6 Direction: Selects if GPIO6 is an input or output: 0 = Input; 1 = Output.
5
GPIO5 Direction: Selects if GPIO5 is an input or output: 0 = Input; 1 = Output.
4
GPIO4 Direction: Selects if GPIO4 is an input or output: 0 = Input; 1 = Output.
3
GPIO3 Direction: Selects if GPIO3 is an input or output: 0 = Input; 1 = Output.
2
GPIO2 Direction: Selects if GPIO2 is an input or output: 0 = Input; 1 = Output.
1
GPIO1 Direction: Selects if GPIO1 is an input or output: 0 = Input; 1 = Output.
0
GPIO0 Direction: Selects if GPIO0 is an input or output: 0 = Input; 1 = Output.
Note: Several of these pins have specific alternate functions. The direction configured here must be consistent with the pins’ use as
the alternate function.
F0 Index 91h
7
GPIO Pin Data Register 1 (R/W)
Reset Value = 00h
GPIO7 Data: Reflects the level of GPIO7: 0 = Low; 1 = High.
6
GPIO6 Data: Reflects the level of GPIO6: 0 = Low; 1 = High.
5
GPIO5 Data: Reflects the level of GPIO5: 0 = Low; 1 = High.
4
GPIO4 Data: Reflects the level of GPIO4: 0 = Low; 1 = High.
3
GPIO3 Data: Reflects the level of GPIO3: 0 = Low; 1 = High.
2
GPIO2 Data: Reflects the level of GPIO2: 0 = Low; 1 = High.
1
GPIO1 Data: Reflects the level of GPIO1: 0 = Low; 1 = High.
0
GPIO0 Data: Reflects the level of GPIO0: 0 = Low; 1 = High.
Note: This register contains the direct values of GPIO[7:0] pins. Write operations are valid only for bits defined as output. Reads from
this register will read the last written value if the pin is an output. The pins are configured as inputs or outputs in F0 Index 90h.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-31. GPIO Pin Configuration/Control Registers (Continued)
Bit
Description
F0 Index 92h
GPIO Control Register 1 (R/W)
Reset Value = 00h
7
GPIO7 Edge Sense for Reload of General Purpose Timer 2: Selects which edge transition of GPIO7 causes
GP Timer 2 to reload: 0 = Rising; 1 = Falling, (Note 2)
6
GPIO6 Enabled as Lid Switch: Allows GPIO6 to act as the lid switch input: 0 = GPIO6; 1 = Lid switch.
When enabled, every transition of the GPIO6 pin causes the lid switch status to toggle and generate an SMI.
The top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[3].
If GPIO6 is enabled as the lid switch, F0 Index 87h/F7h[4] reports the current status of the lid’s position.
5
GPIO2 Edge Sense for SMI: Selects which edge transition of the GPIO2 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 2 must be set to enable this bit.
4
GPIO1 Edge Sense for SMI: Selects which edge transition of the GPIO1 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 1 must be set to enable this bit.
3
GPIO0 Edge Sense for SMI: Selects which edge transition of the GPIO0 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 0 must be set to enable this bit.
2
Enable GPIO2 as an External SMI Source: Allow GPIO2 to be an external SMI source and generate an SMI on either a
rising or falling edge transition (depends upon setting of bit 5): 0 = Disable; 1 = Enable (Note 3).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 87h/F7h[7].
1
Enable GPIO1 as an External SMI Source: Allow GPIO1 to be an external SMI source and generate an SMI on either a
rising- or falling-edge transition (depends upon setting of bit 4): 0 = Disable; 1 = Enable (Note 3).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 87h/F7h[6].
0
Enable GPIO0 as an External SMI Source: Allow GPIO0 to be an external SMI source and generate an SMI on either a
rising or falling edge transition (depends upon setting of bit 3): 0 = Disable; 1 = Enable (Note 3)
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 87h/F7h[5].
Notes: 1) For any of the above bits to function properly, the respective GPIO pin must be configured as an input (F0 Index 90h).
2) GPIO7 can generate an SMI (F0 Index 97h[3]) or re-trigger General Purpose Timer 2 (F0 Index 8Bh[2]) or both.
3) If GPIO[2:0] are enabled as external SMI sources, they are the only GPIOs that can be used as SMI sources to wake-up the
system from Suspend when the clocks are stopped.
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Table 3-31. GPIO Pin Configuration/Control Registers (Continued)
Bit
Description
Index 97h
7
GPIO Control Register 2 (R/W)
Reset Value = 00h
GPIO7 Edge Sense for SMI: Selects which edge transition of the GPIO7 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 3 must be set to enable this bit.
6
GPIO5 Edge Sense for SMI: Selects which edge transition of the GPIO5 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 2 must be set to enable this bit.
5
GPIO4 Edge Sense for SMI: Selects which edge transition of the GPIO4 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 1 must be set to enable this bit.
4
GPIO3 Edge Sense for SMI: Selects which edge transition of the GPIO3 pin will cause an external SMI:
0 = Rising; 1 = Falling.
Bit 0 must be set to enable this bit.
3
Enable GPIO7 as an External SMI Source: Allow GPIO7 to be an external SMI source and to generate an SMI on either
a rising or falling edge transition (depends upon setting of bit 7): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[3].
2
Enable GPIO5 as an External SMI Source: Allow GPIO5 to be an external SMI source and to generate an SMI on either
a rising or falling edge transition (depends upon setting of bit 6): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[2].
1
Enable GPIO4 as an External SMI Source: Allow GPIO4 to be an external SMI source and to generate an SMI on either
a rising- or falling-edge transition (depends upon setting of bit 5): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[1].
0
Enable GPIO3 as an External SMI Source: Allow GPIO3 to be an external SMI source and to generate an SMI on either
a rising or falling edge transition (depends upon setting of bit 4) 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[0].
Note: For any of the above bits to function properly, the respective GPIO pin must be configured as an input (F0 Index 90h).
3.4.3.5
Power Management SMI Status Reporting
Registers
The CS5530 updates status registers to reflect the SMI
sources. Power management SMI sources are the device
idle timers, address traps, and general purpose I/O pins.
isters, one “read only” (mirror) and one “read to clear”.
The data returned by reading either offset is the same, the
difference between the two being that the SMI can not be
cleared by reading the mirror register.
Figure 3-7 shows an example SMI tree for checking and
clearing the source of General Purpose Timers and the
User Defined Trap generated SMI.
Power management events are reported to the processor
through the SMI# pin. It is active low. When an SMI is initiated, the SMI# pin is asserted low and is held low until all
SMI sources are cleared. At that time, SMI# is deasserted.
Table 3-32 shows the bit formats of the read to clear Top
Level SMI Status Register (F1BAR+Memory Offset 02h).
Table 3-33 shows the bit formats of the read to clear second level SMI status registers. For information regarding
the location of the corresponding mirror register, refer to
the note in the footer of the register description.
All SMI sources report to the Top Level SMI Status Register (F1BAR+Memory Offset 02h) and the Top Level SMI
Status Mirror Register (F1BAR+Memory Offset 00h). The
Top SMI Status and Status Mirror Registers are the top
level of hierarchy for the SMI Handler in determining the
source of an SMI. These two registers are identical except
that reading the register at F1BAR+Memory Offset 02h
clears the status.
Keep in mind, all SMI sources in the CS5530 are reported
into the Top Level SMI Status Registers (F1BAR+Memory
Offset 00h/02h); however, this discussion is regarding
power management SMIs. For details regarding audio
SMI events/reporting, refer to Section 3.7.2.2 “Audio SMI
Related Registers” on page 120.
Since all SMI sources report to the Top Level SMI Status
Register, many of its bits combine a large number of
events requiring a second level of SMI status reporting.
The second level of SMI status reporting is set up very
much like the top level. There are two status reporting reg-
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
SMI# Asserted
SMM software reads SMI Header
If Bit X = 0
(Internal SMI)
If Bit X = 1
(External SMI)
Geode™
GXLV
Processor
Call internal SMI handler
to take appropriate action
Geode™ CS5530
F1BAR+Memory
Offset 02h
Read to Clear
to determine
top-level source
of SMI
SMI Deasserted after all SMI Sources are Cleared
(i.e., Top and Second Levels - note some sources may have a Third Level)
F1BAR+Memory
Offset 06h
Read to Clear
to determine
second-level
source of SMI
Bits [15:10]
Other_SMI
Bit 9
GTMR_TRP_SMI
If bit 9 = 1,
Source of SMI
is GP Timer or UDEF Trap
Bits 15:6
RSVD
Bit 5
PCI_TRP_SMI
Bit 4
UDEF3_TRP_SMI
Bit 3
UDEF2_TRP_SMI
Bits [8:0]
Other_SMI
Bit 2
UDEF1_TRP_SMI
Take
Appropriate
Action
Bit 1
GPT2_SMI
Bit 0
GPT1_SMI
Top Level
Second Level
Figure 3-7. General Purpose Timer and UDEF Trap SMI Tree Example
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Table 3-32. Top Level SMI Status Register (Read to Clear)
Bit
Description
F1BAR+Memory Offset 02h-03h
Top Level SMI Status Register (RC)
Reset Value = 0000h
15
Suspend Modulation Enable Mirror (Read to Clear): This bit mirrors the Suspend Modulation Feature Enable bit (F0
Index 96h[0]). It is used by the SMI handler to determine if the SMI Speedup Disable Register (F1BAR+Memory Offset
08h) must be cleared on exit.
14
SMI Source is USB (Read to Clear): SMI was caused by USB activity? 0 = No; 1 = Yes.
SMI generation is configured in F0 Index 42h[7:6].
13
SMI Source is Warm Reset Command (Read to Clear): SMI was caused by Warm Reset command?
0 = No; 1 = Yes.
12
SMI Source is NMI (Read to Clear): SMI was caused by NMI activity? 0 = No; 1 = Yes.
11:10
9
Reserved (Read to Clear): Always reads 0.
SMI Source is General Purpose Timers/User Defined Device Traps/Register Space Trap (Read to Clear): SMI was
caused by expiration of GP Timer 1/2; trapped access to UDEF3/2/1; trapped access to F1-F4 or ISA Legacy Register
Space? 0 = No; 1 = Yes.
The next level of status is found at F1BAR+Memory Offset 04h/06h.
8
SMI Source is Software Generated (Read to Clear): SMI was caused by software? 0 = No; 1 = Yes.
7
SMI on an A20M# Toggle (Read to Clear): SMI was caused by an access to either Port 092h or the keyboard command
which initiates an A20M# SMI? 0 = No; 1 = Yes.
This method of controlling the internal A20M# in the GXLV processor is used instead of a pin.
SMI generation enabling is at F0 Index 53h[0].
6
SMI Source is a VGA Timer Event (Read to Clear): SMI was caused by the expiration of the VGA Timer
(F0 Index 8Eh)? 0 = No; 1 = Yes.
SMI generation enabling is at F0 Index 83h[3].
5
SMI Source is Video Retrace (IRQ2) (Read to Clear): SMI was caused by a video retrace event as decoded from the
serial connection (PSERIAL register, bit 7) from the GXLV processor? 0 = No; 1 = Yes.
SMI generation enabling is at F0 Index 83h[2].
4:2
Reserved (Read to Clear): Always reads 0.
1
SMI Source is Audio Interface (Read to Clear): SMI was caused by the audio interface? 0 = No; 1 = Yes.
The next level SMI status registers is found in F3BAR+Memory Offset 10h/12h.
0
SMI Source is Power Management Event (Read to Clear): SMI was caused by one of the power management
resources? 0 = No; 1 = Yes.
The next level of status is found at F0 Index 84h-87h/F4h-F7h.
Note: The status for the General Purpose Timers and the User Device Defined Traps are checked separately in bit 9.
Note: Reading this register clears all the SMI status bits. Note that bits 9, 1, and 0 have another level (second) of status reporting.
A read-only “Mirror” version of this register exists at F1BAR+Memory Offset 00h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), the Mirror register may be read instead.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-33. Second Level Pwr Mgmnt SMI Status Reporting Registers (Read to Clear)
Bit
Description
F1BAR+Memory Offset 06h-07h
15:6
5
Second Level General Traps/Timers
SMI Status Register (RC)
Reset Value = 0000h
Reserved (Read to Clear)
PCI Function Trap (Read to Clear): SMI was caused by a trapped configuration cycle (listed below)?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
Trapped Access to F1 Register Space; SMI generation enabling is at F0 Index 41h[3].
Trapped Access to F2 Register Space; SMI generation enabling is at F0 Index 41h[6].
Trapped Access to F3 Register Space; SMI generation enabling is at F0 Index 42h[0].
Trapped Access to F4 Register Space; SMI generation enabling is at F0 Index 42h[1].
Trapped Access to ISA Legacy I/O Register Space; SMI generation enabling is at F0 Index 41h[0].
4
SMI Source is Trapped Access to User Defined Device 3 (Read to Clear): SMI was caused by a trapped I/O or memory access to the User Defined Device 3 (F0 Index C8h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[6].
3
SMI Source is Trapped Access to User Defined Device 2 (Read to Clear): SMI was caused by a trapped I/O or memory access to the User Defined Device 2 (F0 Index C4h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[5].
2
SMI Source is Trapped Access to User Defined Device 1 (Read to Clear): SMI was caused by a trapped I/O or memory access to the User Defined Device 1 (F0 Index C0h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[4].
1
SMI Source is Expired General Purpose Timer 2 (Read to Clear): SMI was caused by the expiration of General
Purpose Timer 2 (F0 Index 8Ah)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 83h[1].
0
SMI Source is Expired General Purpose Timer 1 (Read to Clear): SMI was caused by the expiration of General
Purpose Timer 1 (F0 Index 88h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 83h[0].
Note: Reading this register clears all the SMI status bits.
A read-only “Mirror” version of this register exists at F1BAR+Memory Offset 04h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), the Mirror register may be read instead.
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Table 3-33. Second Level Pwr Mgmnt SMI Status Reporting Registers (Read to Clear) (Continued)
Bit
Description
F0 Index F4h
7:5
Second Level Power Management Status Register 1 (RC)
Reset Value = 00h
Reserved
4
Game Port SMI Status (Read to Clear): SMI was caused by a R/W access to game port (I/O Port 200h and 201h)?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
Game Port Read SMI generation enabling is at F0 Index 83h[4].
Game Port Write SMI generation enabling is at F0 Index 53h[3].
3
GPIO7 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO7 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[3].
2
GPIO5 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO5 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[2].
1
GPIO4 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO4 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[1].
0
GPIO3 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO3 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[0].
Note: Properly-configured means that the GPIO pin must be enabled as a GPIO, an input, and to cause an SMI.
This register provides status on various power-management SMI events. Reading this register clears the SMI status bits. A
read-only (mirror) version of this register exists at F0 Index 84h.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-33. Second Level Pwr Mgmnt SMI Status Reporting Registers (Read to Clear) (Continued)
Bit
Description
F0 Index F5h
7
Second Level Power Management Status Register 2 (RC)
Reset Value = 00h
Video Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Video Idle Timer Count Register (F0
Index A6h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[7].
6
User Defined Device 3 (UDEF3) Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the UDEF3
Idle Timer Count Register (F0 Index A4h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[6].
5
User Defined Device 2 (UDEF2) Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the UDEF2
Idle Timer Count Register (F0 Index A2h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[5].
4
User Defined Device 1 (UDEF1) Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the UDEF1
Idle Timer Count Register (F0 Index A0h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[4].
3
Keyboard/Mouse Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Keyboard/Mouse Idle
Timer Count Register (F0 Index 9Eh)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[3].
2
Parallel/Serial Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Parallel/Serial Port Idle
Timer Count Register (F0 Index 9Ch)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[2].
1
Floppy Disk Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Floppy Disk Idle Timer Count
Register (F0 Index 9Ah)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[1].
0
Primary Hard Disk Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Primary Hard Disk Idle
Timer Count Register (F0 Index 98h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[0].
Note: This register provides status on the Device Idle Timers to the SMI handler. A bit set here indicates that the device was idle for
the duration configured in the Idle Timer Count register for that device, causing an SMI. Reading this register clears the SMI
status bits. A read-only (mirror) version of this register exists at F0 Index 85h. If the value of the register must be read without
clearing the SMI source (and consequently deasserting SMI), F0 Index 85h may be read instead.
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Table 3-33. Second Level Pwr Mgmnt SMI Status Reporting Registers (Read to Clear) (Continued)
Bit
Description
F0 Index F6h
7
Second Level Power Management Status Register 3 (RC)
Reset Value = 00h
Video Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the Video I/O Trap? 0 =
No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[7].
6
Reserved (Read Only)
5
Secondary Hard Disk Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the
secondary hard disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 83h[6].
4
Secondary Hard Disk Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Hard Disk Idle
Timer Count Register (F0 Index ACh)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 83h[7].
3
Keyboard/Mouse Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the keyboard
or mouse? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[3].
2
Parallel/Serial Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to either the serial or
parallel ports? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[2].
1
Floppy Disk Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the
floppy disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[1].
0
Primary Hard Disk Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the
primary hard disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[0].
Note: This register provides status on the Device Traps to the SMI handler. A bit set here indicates that an access occurred to the
device while the trap was enabled, causing an SMI. Reading this register clears the SMI status bits. A read-only (mirror) version of this register exists at F0 Index 86h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), F0 Index 86h may be read instead.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-33. Second Level Pwr Mgmnt SMI Status Reporting Registers (Read to Clear) (Continued)
Bit
Description
F0 Index F7h
7
Second Level Power Management Status Register 4 (RO/RC)
Reset Value = 00h
GPIO2 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO2 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[2].
6
GPIO1 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO1 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[1].
5
GPIO0 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO0 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[0].
4
Lid Position (Read Only): This bit maintains the current status of the lid position. If the GPIO6 pin is configured as the lid
switch indicator, this bit reflects the state of the pin.
3
Lid Switch SMI Status (Read to Clear): SMI was caused by a transition on the GPIO6 (lid switch) pin?
0 = No; 1 = Yes.
For this to happen, the GPIO6 pin must be configured both as an input (F0 Index 90h[6] = 0) and as the lid switch (F0
Index 92h[6] =1).
2
Codec SDATA_IN SMI Status (Read to Clear): SMI was caused by an AC97 codec producing a positive edge on
SDATA_IN? 0 = No; 1 = Yes.
This is the second level of status is reporting. The top level status is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 80h[5].
1
RTC Alarm (IRQ8) SMI Status (Read to Clear): SMI was caused by an RTC interrupt? 0 = No; 1 = Yes.
This SMI event can only occur while in 3V Suspend and RTC interrupt occurs.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
0
ACPI Timer SMI Status (Read to Clear): SMI was caused by an ACPI Timer MSB toggle? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation configuration is at F0 Index 83h[5].
Note: Properly-configured means that the GPIO pin must be enabled as a GPIO, an input, and to cause an SMI.
This register provides status on several miscellaneous power management events that generate SMIs, as well as the status of
the Lid Switch. Reading this register clears the SMI status bits. A read-only (mirror) version of this register exists at F0 Index
87h.
3.4.3.6 Device Power Management Register Programming Summary
Table 3-34 provides a programming register summary of
Configuration Registers - Function 0” on page 149 and
the device idle timers, address traps, and general purpose
Section 4.3.2 “SMI Status and ACPI Timer Registers I/O pins. For complete bit information regarding the regisFunction 1” on page 179.
ters listed in Table 3-34, refer to Section 4.3.1 “Bridge
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Table 3-34. Device Power Management Programming Summary
Located at F0 Index xxh Unless Otherwise Noted
Device Power
Management Resource
Enable
Configuration
Second Level
SMI Status/No Clear
Second Level SMI
Status/With Clear
Global Timer Enable
80h[1]
N/A
N/A
Keyboard / Mouse Idle Timer
81h[3]
93h[1:0]
85h[3]
N/A
F5h[3]
Parallel / Serial Idle Timer
81h[2]
93h[1:0]
85h[2]
F5h[2]
Floppy Disk Idle Timer
81h[1]
9Ah[15:0], 93h[7]
85h[1]
F5h[1]
Video Idle Timer (Note 1)
81h[7]
A6h[15:0]
85h[7]
F5h[7]
VGA Timer (Note 2)
83h[3]
8Eh[7:0]
F1BAR+Memory
Offset 00h[6]
F1BAR+Memory
Offset 02h[6]
Primary Hard Disk Idle Timer
81h[0]
98h[15:0], 93h[5]
85h[0]
F5h[0]
Secondary Hard Disk Idle Timer
83h[7]
ACh[15:0], 93h[4]
86h[4]
F6h[4]
User Defined Device 1 Idle Timer
81h[4]
A0h[15:0], C0h[31:0],
CCh[7:0]
85h[4]
F5h[4]
User Defined Device 2 Idle Timer
81h[5]
A2h[15:0], C4h[31:0],
CDh[7:0]
85h[5]
F5h[5]
User Defined Device 3 Idle Timer
81h[6]
A4h[15:0], C8h[31:0],
CEh[7:0]
85h[6]
F5h[6]
Global Trap Enable
80h[2]
N/A
N/A
N/A
Keyboard / Mouse Trap
82h[3]
9Eh[15:0] 93h[1:0]
86h[3]
F6h[3]
Parallel / Serial Trap
82h[2]
9Ch[15:0], 93h[1:0]
86h[2]
F6h[2]
Floppy Disk Trap
82h[1]
93h[7]
86h[1]
F6h[1]
Video Access Trap
82h[7]
N/A
86h[7]
F6h[7]
Primary Hard Disk Trap
82h[0]
93h[5]
86h[0]
F6h[0]
Secondary Hard Disk Trap
83h[6]
93h[4]
86h[5]
F6h[5]
User Defined Device 1 Trap
82h[4]
C0h[31:0], CCh[7:0]
F1BAR+Memory
Offset 04h[2]
F1BAR+Memory
Offset 06h[2]
User Defined Device 2 Trap
82h[5]
C4h[31:0], CDh[7:0]
F1BAR+Memory
Offset 04h[3]
F1BAR+Memory
Offset 06h[3]
User Defined Device 3 Trap
82h[6]
C8h[31:0], CEh[7:0]
F1BAR+Memory
Offset 04h[4]
F1BAR+Memory
Offset 06h[4]
General Purpose Timer 1
83h[0]
88h[7:0], 89h[7:0], 8Bh[4]
F1BAR+Memory
Offset 04h[0]
F1BAR+Memory
Offset 06h[0]
General Purpose Timer 2
83h[1]
8Ah[7:0], 8Bh[5,3,2]
F1BAR+Memory
Offset 04h[1]
F1BAR+Memory
Offset 06h[1]
GPIO7 Pin
N/A
90h[7], 91h[7], 92h[7],
97h[7,3]
91h[7]
N/A
GPIO6 Pin
N/A
90h[6], 91h[6], 92h[6]
87h[4,3], 91h[6]
F7h[4,3]
GPIO5 Pin
N/A
90h[5], 91h[5], 97h[6,2]
91h[5]
N/A
GPIO4 Pin
N/A
90h[4], 91h[4], 97h[5,1]
91h[4]
N/A
GPIO3 Pin
N/A
90h[3], 91h[3], 97h[4,0]
91h[3]
N/A
GPIO2 Pin
N/A
90h[2], 91h[2], 92h[5,2]
87h[7], 91h[2]
F7h[7]
GPIO1 Pin
N/A
90h[1], 91h[1] 92h[4,1]
87h[6], 91h[1]
F7h[6]
GPIO0 Pin
N/A
90h[0], 91h[0], 92h[3,0]
87h[5], 91h[0]
F7h[5]
Suspend Modulation OFF/ON
Video Speedup
IRQ Speedup
96h[0]
80h[4]
80h[3]
94h[7:0]/95h[7:0]
8Dh[7:0]
8Ch[7:0]
N/A
A8h[15:0]
N/A
N/A
N/A
N/A
Note: 1. This function is used for Suspend determination.
2. This function is used for SoftVGA.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5
PC/AT COMPATIBILITY LOGIC
The CS5530’s PC/AT compatibility logic provides support
for the standard PC architecture. This subsystem also
provides legacy support for existing hardware and software. Support functions for the GXLV processor provided
by these subsystems include:
-
PCI Compatible Interrupts
System Control I/O Port 092h and 061h
Keyboard Interface Function
External Real-Time Clock Interface
The following subsections give a detailed description for
each of these functions.
• ISA Subtractive Decode
• ISA Bus Interface
- Delayed PCI Transactions
- Limited ISA and ISA Master Modes
3.5.1 ISA Subtractive Decode
The CS5530 provides an ISA bus controller. The CS5530
is the default subtractive-decoding agent, and forwards all
unclaimed memory and I/O cycles to the ISA interface.
However, the CS5530 can be configured using F0 Index
04h[1:0] to ignore either I/O, memory, or all unclaimed
cycles (subtractive decode disabled, F0 Index 41h[2:1] =
1x (Table 3-35).
• ROM Interface
• Megacells
- Direct Memory Access (DMA)
- Programmable Interval Timer
- Programmable Interrupt Controller
Table 3-35. Cycle Configuration Bits
Bit
Description
F0 Index 04h-05h
PCI Command Register (R/W)
Reset Value = 0000h
1
Memory Space: Allow the CS5530 to respond to memory cycles from the PCI bus:
0 = Disable; 1 = Enable (Default).
0
I/O Space: Allow the CS5530 to respond to I/O cycles from the PCI bus: 0 = Disable; 1 = Enable (Default).
F0 Index 41h
2:1
PCI Function Control Register 2 (R/W)
Reset Value = 10h
Subtractive Decode: These bits determine the point at which the CS5530 accepts cycles that are not claimed by another
device. The CS5530 defaults to taking subtractive decode cycles in the default cycle clock, but can be moved up to the
Slow Decode cycle point if all other PCI devices decode in the fast or medium clocks. Disabling subtractive decode must
be done with care, as all ISA and ROM cycles are decoded subtractively.
00 = Default sample (4th clock from FRAME# active)
01 = Slow sample (3rd clock from FRAME# active)
1x = No subtractive decode
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3.5.2 ISA Bus Interface
The ISA bus controller issues multiple ISA cycles to satisfy PCI transactions that are larger than 16 bits. A full 32bit read or write results in two 16-bit ISA transactions or
four 8-bit ISA transactions. The ISA controller gathers the
data from multiple ISA read cycles and returns TRDY#
only after all of the data can be presented to the PCI bus
at the same time.
SA[23:0] are a concatenation of ISA LA[23:17] and
SA[19:0] and perform equivalent functionality at a reduced
pin count.
Figure 3-8 shows the relationship between a PCI cycle
and the corresponding ISA cycle generated.
PCI_CLK
ISACLK
FRAME#
IRDY#
TRDY#
STOP#
AD[31:0] (Read)
AD[31:0] (Write)
BALE
IOR#/IOW#
MEMR#/MEMW#
Figure 3-8. Non-Posted PCI-to-ISA Access
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.2.1 Delayed PCI Transactions
If PCI delayed transactions are enabled (F0 Index 42h[5]
= 1) multiple PCI cycles occur for every slower ISA cycle.
Figure 3-9 shows the relationship of PCI cycles to an ISA
cycle with PCI delayed transactions enabled.
See Section 3.2.6 “Delayed Transactions” on page 48 for
additional information.
REQ#
GNT#
FRAME#
2
1
1
PCI
IRDY#
1
TRDY#
STOP#
1
BALE
ISA
IOR#
3
1 - Delay
2 - IDE bus master - starts and completes
3 - End of ISA cycle
Figure 3-9. PCI to ISA Cycles with Delayed Transaction Enabled
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Table 3-36. Signal Assignments
3.5.2.2 Limited ISA and ISA Master Modes
The CS5530 supports two modes on the ISA interface.
The default mode of the ISA bus is a fully functional ISA
mode, but it does not support ISA masters, as shown in
Figure 3-10 “Limited ISA Mode”. When in this mode, the
address and data buses are multiplexed together, requiring an external latch to latch the lower 16 bits of address
of the ISA cycle. The signal SA_LATCH is generated
when the data on the SA/SD bus is a valid address. Additionally, the upper four address bits, SA[23:20], are multiplexed on GPIO[7:4].
Pin No.
Limited ISA Mode
ISA Master
Mode
AD15
SA_LATCH
SA_DIR
AE25, AD24,
AE22, AE21,
AF21, AC20,
AD19, AF19,
AF4, AF5,
AD5, AF6,
AC6, AD9,
AE6, AE9
SA[15:0]/SD[15:0]
SD[15:0]
H2, K1, K2,
L1, D1, E2,
F1, G1, G3,
G4, G2, H1,
J1, J3, J2, K3
FP_DATA[15:0]
SA[15:0]
H3
FP_DATA[16]
SA_OE#
F3
FP_DATA[17]
MASTER#
E1
FP_HSYNC_OUT
SMEMW#
E3
FP_VSYNC_OUT
SMEMR#
The mode of operation is selected by the strapping of pin
P26 (INTR):
AF3 (Note)
SMEMW#
RTCCS#
AD4 (Note)
SMEMR#
RTCALE
• ISA Limited Mode — Strap pin P26 (INTR) low through
a 10-kohm resistor.
AF23, AE23,
AC21, AD22
GPIO[7:4]
SA[23:20]
SA[23:20]
The second mode of the ISA interface supports ISA bus
masters, as shown in Figure 3-11. When the CS5530 is
placed in the ISA Master mode, a large number of pins
are redefined as shown in Table 3-36.
In this mode of operation, the CS5530 cannot support
TFT flat panels or TV controllers, since most of the signals
used to support these functions have been redefined. This
mode is required if ISA slots or ISA masters are used. ISA
master cycles are only passed to the PCI bus if they
access memory. I/O accesses are left to complete on the
ISA bus. SA[15:0] and MASTER# are not 5.0V tolerant;
therefore, the SA lines require a buffer and MASTER#
should be pulled up to 3.3V (not 5.0V).
• ISA Master Mode — Strap pin P26 (INTR) high through
a 10-kohm resistor.
Note:
Bit 7 of F0 Index 44h[7] (bit details on page 152) reports
the strap value of the INTR pin (pin P26) during POR: 0 =
ISA Limited; 1 = ISA Master.
If Limited ISA Mode of operation has been
selected, SMEMW# and SMEMR# can be output
on these pins by programming F0 Index 53[2] = 0
(bit details on page 154).
This bit can be written after POR# deassertion to change
the ISA mode selected. Writing to this bit is not recommended due to the actual strapping done on the board.
ISA memory and ISA refresh cycles are not supported by
the CS5530. Although, the refresh toggle bit in I/O Port
061h still exists for software compatibility reasons.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
ISA Control2
Geode™
CS5530
ISA Device
SD[15:0]
1GPIO[7:4]/SA[23:20]
SA[23:20]
SA[19:16]
SA[19:16]
SA[15:0]/SD[15:0]
D
INTR
10K3
SA_LATCH/SA_DIR
Q
SA[15:0]
74F373x2
G
OC
Notes:
1. F0 Index 43h[2] controls GPIO[7:4]/SA[23:20].
2. These signals are: MEMW#, MEMR#, IOR#, IOW#, TC, AEN, DREQ[7:5, 3:0], DACK[7:5, 3:0]#, MEMCS16#, ZEROWS#,
SBHE#, IOCS16#, IOCHRDY, ISACLK.
3. This resistor is used at boot time to determine the mode of the ISA bus.
Figure 3-10. Limited ISA Mode
ISA Control2
FP_VSYNC_OUT/SMEMR#
SMEMR#
SMEMW#
FP_HSYNC_OUT/SMEMW#
3.3V
330Ω
MASTER#
FP_DATA17/MASTER#
1GPIO[7:4]/SA[23:20]
SA[23:20]
SA[19:16]
SA[19:16]
A
FP_DATA[15:0]/SA[15:0]
SA_OE#
FP_DATA16/SA_OE#
SA_LATCH/SA_DIR
SA_DIR
B
SA[15:0]
74L245x2
OE#
T/R
5.0V
Geode™
CS5530
INTR
ISA Master
10K3
SA[15:0]_SD[15:0]/SD[15:0]
SD[15:0]
Notes:
1. When strapped for ISA Master mode, GPIO[7:4]/SA[23:20] are set to SA[23:20] and the settings in F0 Index 43h[2] are invalid.
2. These signals are: MEMW#, MEMR#, IOR#, IOW#, TC, AEN, DREQ[7:5, 3:0], DACK[7:5, 3:0]#, MEMCS16#, ZEROWS#,
SBHE#, IOCS16#, IOCHRDY, ISACLK.
3. This resistor is used at boot time to determine the mode of the ISA bus.
Figure 3-11. ISA Master Mode
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3.5.2.3 ISA Bus Data Steering
The CS5530 performs all of the required data steering
from SD[7:0] to SD[15:0] during normal 8-bit ISA cycles,
as well as during DMA and ISA master cycles. It handles
data transfers between the 32-bit PCI data bus and the
ISA bus. 8/16-bit devices can reside on the ISA bus. Various PC-compatible I/O registers, DMA controller registers,
interrupt controller registers, and counter/timer registers
lie on the on-chip I/O data bus. Either the PCI bus master
or the DMA controllers can become the bus owner.
When the DMA requestor is the bus owner, the CS5530
allows 8/16-bit data transfer between the ISA bus and the
PCI data bus.
3.5.2.4 I/O Recovery Delays
In normal operation, the CS5530 inserts a delay between
back-to-back ISA I/O cycles that originate on the PCI bus.
The default delay is four ISACLK cycles. Thus, the second
of consecutive I/O cycles is held in the ISA bus controller
until this delay count has expired. The delay is measured
between the rising edge of IOR#/IOW# and the falling
edge of BALE. This delay can be adjusted to a greater
delay through the ISA I/O Recovery Control Register (F0
Index 51h, see Table 3-37).
When the PCI bus master is the bus owner, the CS5530
data steering logic provides data conversion necessary
for 8/16/32-bit transfers to and from 8/16-bit devices on
either the ISA bus or the 8-bit registers on the on-chip I/O
data bus. When PCI data bus drivers of the CS5530 are
tristated, data transfers between the PCI bus master and
PCI bus devices are handled directly via the PCI data bus.
Note:
This delay is not inserted for a 16-bit ISA I/O
access that is split into two 8-bit I/O accesses.
Table 3-37. I/O Recovery Programming Register
Bit
Description
F0 Index 51h
7:4
0000 = 1 PCI clock
0001 = 2 PCI clocks
0010 = 3 PCI clocks
0011 = 4 PCI clocks
3:0
Reset Value = 44h
0100 = 5 PCI clocks
0101 = 6 PCI clocks
0110 = 7 PCI clocks
0111 = 8 PCI clocks
1000 = 9 PCI clocks
1001 = 10 PCI clocks
1010 = 11 PCI clocks
1011 = 12 PCI clocks
1100 = 13 PCI clocks
1101 = 14 PCI clocks
1110 = 15 PCI clocks
1111 = 16 PCI clocks
16-Bit I/O Recovery: These bits determine the number of ISA bus clocks between back-to-back 16-bit I/O cycles. This
count is in addition to a preset one-clock delay built into the controller.
0000 = 1 PCI clock
0001 = 2 PCI clocks
0010 = 3 PCI clocks
0011 = 4 PCI clocks
Revision 4.1
ISA I/O Recovery Control Register (R/W)
8-Bit I/O Recovery: These bits determine the number of ISA bus clocks between back-to-back 8-bit I/O read cycles. This
count is in addition to a preset one-clock delay built into the controller.
0100 = 5 PCI clocks
0101 = 6 PCI clocks
0110 = 7 PCI clocks
0111 = 8 PCI clocks
1000 = 9 PCI clocks
1001 = 10 PCI clocks
1010 = 11 PCI clocks
1011 = 12 PCI clocks
89
1100 = 13 PCI clocks
1101 = 14 PCI clocks
1110 = 15 PCI clocks
1111 = 16 PCI clocks
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.2.5 ISA DMA
DMA transfers occur between ISA I/O peripherals and
system memory. The data width can be either 8 or 16 bits.
Out of the seven DMA channels available, four are used
for 8-bit transfers while the remaining three are used for
16-bit transfers. One BYTE or WORD is transferred in
each DMA cycle.
Note:
PCI arbiter. After the PCI bus has been granted, the
respective DACK# is driven active.
The CS5530 generates PCI memory read or write cycles
in response to a DMA cycle. Figures 3-12 and 3-13 are
examples of DMA memory read and memory write cycles.
Upon detection of the DMA controller’s MEMR# or
MEMW# active, the CS5530 starts the PCI cycle, asserts
FRAME#, and negates an internal IOCHRDY. This
assures the DMA cycle does not complete before the PCI
cycle has provided or accepted the data. IOCHRDY is
internally asserted when IRDY# and TRDY# are sampled
active.
The CS5530 does not support DMA transfers to
ISA memory.
The ISA DMA device initiates a DMA request by asserting
one of the DRQ[7:5, 3:0] signals. When the CS5530
receives this request, it sends a bus grant request to the
PCICLK
ISACLK
MEMR#
IOW#
SD[15:0]
IOCHRDY
FRAME#
AD[31:0]
IRDY#
TRDY#
Figure 3-12. ISA DMA Read from PCI Memory
PCICLK
ISACLK
MEMW#
IOR#
SD[15:0]
IOCHRDY
FRAME#
AD[31:0]
IRDY#
TRDY#
Figure 3-13. ISA DMA Write To PCI Memory
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3.5.3 ROM Interface
The CS5530 positively decodes memory addresses
000F0000h-000FFFFFh (64 KB) and FFFC0000hFFFFFFFFh (256 KB) at reset. These memory cycles
cause the CS5530 to claim the cycle, and generate an
ISA bus memory cycle with KBROMCS# asserted. The
CS5530 can also be configured to respond to memory
addresses FF000000h-FFFFFFFFh (16 MB) and
000E0000h-000FFFFFh (128 KB).
3.5.4 Megacells
The CS5530 core logic integrates:
• Two 8237-equivalent DMA controllers (DMAC) with full
32-bit addressing for DMA transfers.
• Two 8259-equivalent interrupt controllers providing 13
individually programmable external interrupts.
• An 8254-equivalent timer for refresh, timer, and
speaker logic.
Flash ROM is supported in the CS5530 by enabling the
KBROMCS# signal on write accesses to the ROM region.
Normally only read cycles are passed to the ISA bus, and
the KBROMCS# signal is suppressed. When the ROM
Write Enable bit (F0 Index 52h[1]) is set, a write access to
the ROM address region causes an 8-bit write cycle to
occur with MEMW# and KBROMCS# asserted.
• NMI control and generation for PCI system errors and
all parity errors.
• Support for standard AT keyboard controllers, reset
control, and VSA technology audio.
Table 3-38 shows the ROM interface related programming
bits.
Table 3-38. ROM Interface Related Bits
Bit
Description
F0 Index 52h
2
ROM/AT Logic Control Register (R/W)
Reset Value = F8h
Upper ROM Address Range: KBROMCS# is asserted for ISA memory read accesses:
0 = FFFC0000h-FFFFFFFFh (256 KB, Default); 1 = FF000000h-FFFFFFFFh (16 MB)
Note: PCI Positive decoding for the ROM space is enabled at F0 Index 5Bh[5]).
1
ROM Write Enable: Assert KBROMCS# during writes to configured ROM space (configured in bits 2 and 0),
allowing Flash programming: 0 = Disable; 1 = Enable.
0
Lower ROM Address Range: KBROMCS# is asserted for ISA memory read accesses:
0 = 000F0000h-000FFFFFh (64 KB, Default); 1 = 000E0000h-000FFFFFh (128 KB).
Note: PCI Positive decoding for the ROM space is enabled at F0 Index 5Bh[5]).
F0 Index 5Bh
5
Decode Control Register 2 (R/W)
Reset Value = 20h
BIOS ROM Positive Decode: Selects PCI positive or subtractive decoding for accesses to the configured ROM space: 0
= Subtractive; 1 = Positive.
ROM configuration is at F0 Index 52h[2:0].
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.4.1 Direct Memory Access (DMA)
The 8237-compatible DMA controllers on the CS5530
control transfers between ISA I/O devices and PCI or ISA
memory. They generate a bus request to the PCI bus
when an I/O device requests a DMA operation. Once they
are granted the bus, the DMA transfer cycle occurs. DMA
transfers can occur over the entire 32-bit address range of
the PCI bus.
HOLD output of the slave is tied to the DRQ0 input of the
master (Channel 4), and the master’s DACK0# output is
tied to the slave’s HLDA input.
In each of these modes, the DMA controller can be programmed for read, write, or verify transfers.
Both DMA controllers are reset at Power On Reset (POR)
to fixed priority. Since master Channel 0 is actually connected to the slave DMA controller, the slave’s four DMA
channels have the highest priority, with Channel 0 as
highest and Channel 3 as the lowest. Immediately following slave Channel 3, master Channel 1 (Channel 5) is the
next highest, followed by Channels 6 and 7.
The CS5530 contains registers for driving the high
address bits (high page) and registers for generating the
middle address bits (low page) output by the 8237 controller.
DMA Controllers
The CS5530 supports seven DMA channels using two
standard 8237-equivalent controllers. DMA Controller 1
contains Channels 0 through 3 and supports 8-bit I/O
adapters. These channels are used to transfer data
between 8-bit peripherals and PCI memory or 8/16-bit ISA
memory. Using the high and low page address registers, a
full 32-bit PCI address is output for each channel so they
can all transfer data throughout the entire 4 GB system
address space. Each channel can transfer data in 64 KB
pages.
DMA Controller Registers
The DMA controller can be programmed with standard I/O
cycles to the standard register space for DMA. The I/O
addresses of all registers for the DMA controller are listed
in Table 4-25 "DMA Channel Control Registers" on page
208.
Addresses under Master are for the 16-bit DMA channels,
and Slave corresponds to the 8-bit channels. When writing to a channel's address or word-count register, the data
is written into both the base register and the current register simultaneously. When reading a channel address or
word count register, only the current address or word
count can be read. The base address and base word
count are not accessible for reading.
DMA Controller 2 contains Channels 4 through 7. Channel 4 is used to cascade DMA Controller 1, so it is not
available externally. Channels 5 through 7 support 16-bit
I/O adapters to transfer data between 16-bit I/O adapters
and 16-bit system memory. Using the high and low page
address registers, a full 32-bit PCI address is output for
each channel so they can all transfer data throughout the
entire 4 GB system address space. Each channel can
transfer data in 128 KB pages. Channels 5, 6, and 7 transfer 16-bit words on even byte boundaries only.
DMA Transfer Types
Each of the seven DMA channels may be programmed to
perform one of three types of transfers: read, write, or verify. The transfer type selected defines the method used to
transfer a BYTE or WORD during one DMA bus cycle.
For read transfer types, the CS5530 reads data from
memory and writes it to the I/O device associated with the
DMA channel.
DMA Transfer Modes
Each DMA channel can be programmed for single, block,
demand or cascade transfer modes. In the most commonly used mode, single transfer mode, one DMA cycle
occurs per DRQ and the PCI bus is released after every
cycle. This allows the CS5530 to timeshare the PCI bus
with the CPU. This is imperative, especially in cases
involving large data transfers, because the CPU gets
locked out for too long.
For write transfer types, the CS5530 reads data from the
I/O device associated with the DMA channel and writes to
the memory.
The verify transfer type causes the CS5530 to execute
DMA transfer bus cycles, including generation of memory
addresses, but neither the Read nor Write command lines
are activated. This transfer type was used by DMA Channel 0 to implement DRAM refresh in the original IBM
PC/XT™.
In block transfer mode, the DMA controller executes all of
its transfers consecutively without releasing the PCI bus.
In demand transfer mode, DMA transfer cycles continue to
occur as long as DRQ is high or terminal count is not
reached. In this mode, the DMA controller continues to
execute transfer cycles until the I/O device drops DRQ to
indicate its inability to continue providing data. For this
case, the PCI bus is held by the CS5530 until a break in
the transfers occurs.
DMA Priority
The DMA controller may be programmed for two types of
priority schemes: fixed and rotate (I/O Ports 008h[4] and
0D0h[4], as shown in Table 4-25 "DMA Channel Control
Registers" on page 208.
In fixed priority, the channels are fixed in priority order
based on the descending values of their numbers. Thus,
Channel 0 has the highest priority. In rotate priority, the
last channel to get service becomes the lowest-priority
In cascade mode, the channel is connected to another
DMA controller or to an ISA bus master, rather than to an
I/O device. In the CS5530, one of the 8237 controllers is
designated as the master and the other as the slave. The
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channel with the priority of the others rotating accordingly.
This prevents a channel from dominating the system.
standard. The starting address for the DMA transfer must
be programmed into the DMA controller registers and the
channel’s respective Low and High Page registers prior to
beginning the DMA transfer.
The address and word count registers for each channel
are 16-bit registers. The value on the data bus is written
into the upper byte or lower byte, depending on the state
of the internal addressing byte pointer. This pointer can be
cleared by the Clear Byte Pointer command. After this
command, the first read/write to an address or word count
register will read/write to the low byte of the 16-bit register
and the byte pointer will point to the high byte. The next
read/write to an address or word-count register will read
or write to the high byte of the 16-bit register and the byte
pointer will point back to the low byte.
DMA Page Registers and Extended Addressing
The DMA Page registers provide the upper address bits
during DMA cycles. DMA addresses do not increment or
decrement across page boundaries. Page boundaries for
the 8-bit channels (Channels 0 through 3) are every 64
KB and page boundaries for the 16-bit channels (Channels 5, 6, and 7) are every 128 KB.
Before any DMA operations are performed, the Page
Registers must be written at the I/O Port addresses
shown in Table 4-26 "DMA Page Registers" on page 211
to select the correct page for each DMA channel. The
other address locations between 080h and 08Fh and
480h and 48Fh are not used by the DMA channels, but
can be read or written by a PCI bus master. These registers are reset to zero at POR. A write to the Low Page
register clears the High Page register, for backward compatibility with the PC/AT standard.
When programming the 16-bit channels (Channels 5, 6,
and 7), the address which is written to the base address
register must be the real address divided by two. Also, the
base word count for the 16-bit channels is the number of
16-bit words to be transferred, not the number of bytes as
is the case for the 8-bit channels.
The DMA controller allows the user to program the active
level (low or high) of the DRQ and DACK# signals. Since
the two controllers are cascaded together internally on the
chip, these signals should always be programmed with the
DRQ signal active high and the DACK# signal active low.
For most DMA transfers, the High Page register is set to
zeros and is driven onto PCI address bits AD[31:24] during DMA cycles. This mode is backward compatible with
the PC/AT standard. For DMA extended transfers, the
High Page register is programmed and the values are
driven onto the PCI addresses AD[31:24] during DMA
cycles to allow access to the full 4 GB PCI address space.
DMA Shadow Registers
The CS5530 contains a shadow register located at F0
Index B8h (Table 3-39) for reading the configuration of the
DMA controllers. This read-only register can sequence to
read through all of the DMA registers.
DMA Address Generation
The DMA addresses are formed such that there is an
upper address, a middle address, and a lower address
portion.
DMA Addressing Capability
DMA transfers occur over the entire 32-bit address range
of the PCI bus. This is accomplished by using the DMA
controller’s 16-bit memory address registers in conjunction with an 8-bit DMA Low Page register and an 8-bit
DMA High Page register. These registers, associated with
each channel, provide the 32-bit memory address capability. A write to the Low Page register clears the High
Page register, for backward compatibility with the PC/AT
The upper address portion, which selects a specific page,
is generated by the Page registers. The Page registers for
each channel must be set up by the system before a DMA
operation. The DMA Page register values are driven on
PCI address bits AD[31:16] for 8-bit channels and
AD[31:17] for 16-bit channels.
Table 3-39. DMA Shadow Register
Bit
Description
F0 Index B8h
7:0
DMA Shadow Register (RO)
Reset Value = xxh
DMA Shadow (Read Only): This 8-bit port sequences through the following list of shadowed DMA Controller registers.
At power on, a pointer starts at the first register in the list and consecutively reads incrementally through it. A write to this
register resets the read sequence to the first register. Each shadow register in the sequence contains the last data written
to that location.
The read sequence for this register is:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
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DMA Channel 0 Mode Register
DMA Channel 1 Mode Register
DMA Channel 2 Mode Register
DMA Channel 3 Mode Register
DMA Channel 4 Mode Register
DMA Channel 5 Mode Register
DMA Channel 6 Mode Register
DMA Channel 7 Mode Register
DMA Channel Mask Register (bit 0 is channel 0 mask, etc.)
DMA Busy Register (bit 0 or 1 means a DMA occurred within last 1 msec, all other bits are 0)
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
The middle address portion, which selects a block within
the page, is generated by the DMA controller at the beginning of a DMA operation and any time the DMA address
increments or decrements through a block boundary.
Block sizes are 256 bytes for 8-bit channels (Channels 0
through 3) and 512 bytes for 16-bit channels (Channels 5,
6, and 7). The middle address bits are driven on PCI
address bits AD[15:8] for 8-bit channels and AD[16:9] for
16-bit channels.
3.5.4.2 Programmable Interval Timer
The CS5530 contains an 8254-equivalent Programmable
Interval Timer (PIT) configured as shown in Figure 3-14.
The PIT has three timers/counters, each with an input frequency of 1.19318 MHz (OSC divided by 12), and individually programmable to different modes.
The gates of Counter 0 and 1 are usually enabled, however, they can be controlled via F0 Index 50h (see Table 340). The gate of Counter 2 is connected to I/O Port
061h[0]. The output of Counter 0 is connected internally to
IRQ0. This timer is typically configured in Mode 3 (square
wave output), and used to generate IRQ0 at a periodic
rate to be used as a system timer function. The output of
Counter 1 is connected to I/O Port 061h[4]. The reset
state of I/O Port 061h[4] is 0 and every falling edge of
Counter 1 output causes I/O Port 061h[4] to flip states.
The output of Counter 2 is brought out to the PC_BEEP
output. This output is gated with I/O Port 061h[1].
The lower address portion is generated directly by the
DMA controller during DMA operations. The lower
address bits are output on PCI address bits AD[7:0] for 8bit channels and AD[8:1] for 16-bit channels.
SBHE# is configured as an output during all DMA operations. It is driven as the inversion of AD0 during 8-bit DMA
cycles and forced low for all 16-bit DMA cycles.
Table 3-40. PIT Control and I/O Port 061h Associated Register Bits
Bit
Description
F0 Index 50h
PIT Control/ISA CLK Divider (R/W)
Reset Value = 7Bh
7
PIT Software Reset: 0 = Disable; 1 = Enable.
6
PIT Counter 1: 0 = Forces Counter 1 output (OUT1) to zero;
1 = Allows Counter 1 output (OUT1) to pass to I/O Port 061h[4].
5
PIT Counter 1 Enable: 0 = Sets GATE1 input low; 1 = Sets GATE1 input high.
4
PIT Counter 0: 0 = Forces Counter 0 output (OUT0) to zero; 1 = Allows Counter 0 output (OUT0) to pass to IRQ0.
3
PIT Counter 0 Enable: 0 = Sets GATE0 input low; 1 = Sets GATE0 input high.
I/O Port 061h
Port B Control Register (R/W)
Reset Value = 00x01100b
5
PIT OUT2 State (Read Only): This bit reflects the current status of the PIT Counter 2 (OUT2).
4
Toggle (Read Only): This bit toggles on every falling edge of Counter 1 (OUT1).
1
PIT Counter 2 (SPKR): 0 = Forces Counter 2 output (OUT2) to zero. 1 = Allows Counter 2 output (OUT2) to pass to the
speaker
0
PIT Counter 2 Enable: 0 = Sets GATE2 input low. 1 = Sets GATE2 input high.
OUT0
CLK0
1.19318 MHz
CLK1
F0 Index 50h[4]
CLK2
F0 Index 50h[3]
GATE0
F0 Index 50h[5]
GATE1
I/O Port 061h[0]
GATE2
IRQ0
OUT1
I/O Port 061h[4]
F0 Index 50h[6]
OUT2
A[1:0]
PC_BEEP
I/O Port 061h[1]
XD[7:0]
IOW#
WR#
IOR#
RD#
Figure 3-14. PIT Timer
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PIT Registers
The PIT registers are summarized and bit formats are in
Table 4-27 "Programmable Interval Timer Registers" on
page 212.
8254 Timer 0
PIT Shadow Register
The PIT registers are shadowed to allow for Zero Volt
Suspend to save/restore the PIT state by reading the PITs
counter and write-only registers. The read sequence for
the shadow register is listed in F0 Index BAh, Table 3-41.
3.5.4.3 Programmable Interrupt Controller
The CS5530 includes an AT-compatible Programmable
Interrupt Controller (PIC) configuration with two 8259equivalent interrupt controllers in a master/slave configuration (Figure 3-15).
RTC_IRQ#
Processor
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IR0
IR1
IR2
IR3
IR4
IR5
IR6
IR7
IR0
IR1
IR2
IR3
IR4
IR5
IR6
IR7
INTR
INTR
Figure 3-15. PIC Interrupt Controllers
Table 3-41. PIT Shadow Register
Bit
Description
F0 Index BAh
7:0
PIT Shadow Register (RO)
Reset Value = xxh
PIT Shadow (Read Only): This 8-bit port sequences through the following list of shadowed Programmable Interval Timer
registers. At power on, a pointer starts at the first register in the list and consecutively reads to increment through it. A
write to this register resets the read sequence to the first register. Each shadow register in the sequence contains the last
data written to that location.
The read sequence for this register is:
1. Counter 0 LSB (least significant byte)
2. Counter 0 MSB
3. Counter 1 LSB
4. Counter 1 MSB
5. Counter 2 LSB
6. Counter 2 MSB
7. Counter 0 Command Word
8. Counter 1 Command Word
9. Counter 2 Command Word
Note: The LSB/MSB of the count is the Counter base value, not the current value.
Bits [7:6] of the command words are not used.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Since the two controllers are cascaded and three of the
interrupt request inputs are connected to the internal 8254
PIT, the coprocessor interface, and the real-time clock
interface, a total of 13 external interrupt requests are
available. See Table 3-42.
rupt acknowledge (INTA) cycles from the CPU. On the first
INTA cycle the cascading priority is resolved to determine
which of the two 8259 controllers output the interrupt vector onto the data bus. On the second INTA cycle the
appropriate 8259 controller drives the data bus with the
correct interrupt vector for the highest priority interrupt.
Table 3-42. PIC Interrupt Mapping
By default, the CS5530 responds to PCI INTA cycles
because the system interrupt controller is located within
the CS5530. This may be disabled with F0 Index 40h[7]
(see Table 3-43). When the CS5530 responds to a PCI
INTA cycle, it holds the PCI bus and internally generate
the two INTA cycles to obtain the correct interrupt vector.
It then asserts TRDY# and returns the interrupt vector.
Master IRQ#
Mapping
IRQ0
Connected to the OUT0 (system timer) of
the internal 8254 PIT.
IRQ2
Connected to the slave’s INTR for a cascaded configuration.
IRQ8#
Connected to external real-time clock.
IRQ13
Connected to the coprocessor interface.
IRQ[15:14, 12:9,
7:3, 1]
External interrupts.
PIC I/O Registers
Each PIC contains registers located in the standard I/O
address locations, as shown in Table 4-28 "Programmable
Interrupt Controller Registers" on page 213.
An initialization sequence must be followed to program
the interrupt controllers. The sequence is started by writing Initialization Command Word 1 (ICW1). After ICW1
has been written, the controller expects the next writes to
follow in the sequence ICW2, ICW3, and ICW4 if it is
needed. The Operation Control Words (OCW) can be
written after initialization. The PIC must be programmed
before operation begins.
The CS5530 allows the PCI interrupt signals INTA#INTD# (also known in industry terms as PIRQx#) to be
routed internally to any IRQ signal. The routing can be
modified through CS5530’s configuration registers. If this
is done, the IRQ input must be configured to be levelrather than edge-sensitive. IRQ inputs may be individually
programmed to be active low, level-sensitive with the
Interrupt Sensitivity configuration registers at I/O address
space 4D0h and 4D1h. PCI interrupt configuration is discussed in further detail in Section 3.5.4.4 “PCI Compatible
Interrupts” on page 98.
Since the controllers are operating in cascade mode,
ICW3 of the master controller should be programmed with
a value indicating that IRQ2 input of the master interrupt
controller is connected to the slave interrupt controller
rather than an I/O device as part of the system initialization code. In addition, ICW3 of the slave interrupt controller should be programmed with the value 02h (slave ID)
and corresponds to the input on the master controller.
PIC Interrupt Sequence
A typical AT-compatible interrupt sequence is as follows.
Any unmasked interrupt generates the INTR signal to the
CPU. The interrupt controller then responds to the inter-
Table 3-43. PCI INTA Cycle Disable/Enable Bit
Bit
Description
F0 Index 40h
7
PCI Function Control Register 1 (R/W)
Reset Value = 89h
PCI Interrupt Acknowledge Cycle Response: The CS5530 responds to PCI interrupt acknowledge cycles:
0 = Disable; 1 = Enable.
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PIC Shadow Register
The PIC registers are shadowed to allow for Zero Volt
Suspend to save/restore the PIC state by reading the
PICs write-only registers. A write to this register resets the
read sequence to the first register. The read sequence for
the shadow register is listed in F0 Index B9h (Table 3-44).
Table 3-44. PIC Shadow Register
Bit
Description
F0 Index B9h
7:0
PIC Shadow Register (RO)
Reset Value = xxh
PIC Shadow (Read Only): This 8-bit port sequences through the following list of shadowed Interrupt Controller registers.
At power on, a pointer starts at the first register in the list and consecutively reads incrementally through it. A write to this
register resets the read sequence to the first register. Each shadow register in the sequence contains the last data written
to that location.
The read sequence for this register is:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
PIC1 ICW1
PIC1 ICW2
PIC1 ICW3
PIC1 ICW4 - Bits [7:5] of ICW4 are always 0
PIC1 OCW2 - Bits [6:3] of OCW2 are always 0 (Note)
PIC1 OCW3 - Bits [7, 4] are 0 and bit [6, 3] are 1
PIC2 ICW1
PIC2 ICW2
PIC2 ICW3
PIC2 ICW4 - Bits [7:5] of ICW4 are always 0
PIC2 OCW2 - Bits [6:3] of OCW2 are always 0 (Note)
PIC2 OCW3 - Bits [7, 4] are 0 and bit [6, 3] are 1
Note: To restore OCW2 to shadow register value, write the appropriate address twice. First with the shadow register
value, then with the shadow register value ORed with C0h.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.4.4 PCI Compatible Interrupts
The CS5530 allows the PCI interrupt signals INTA#,
INTB#, INTC#, and INTD# (also known in industry terms
as PIRQx#) to be mapped internally to any IRQ signal
with the PCI Interrupt Steering Registers 1 and 2, F0
Index 5Ch and 5Dh (Table 3-45).
IRQ[15:14,12:9,7:3,1]
PCI INTA#-INTD#
Steering Registers
F0 Index 5Ch,5Dh
12
PCI interrupts are low-level sensitive, whereas PC/AT
interrupts are positive-edge sensitive; therefore, the PCI
interrupts are inverted before being connected to the
8259.
Although the controllers default to the PC/AT-compatible
mode (positive-edge sensitive), each IRQ may be individually programmed to be edge or level sensitive using the
Interrupt Edge/Level Sensitivity registers in I/O Port 4D0h
and 4D1h, as shown in Table 3-46. However, if the controllers are programmed to be level-sensitive via ICW1, all
interrupts must be level-sensitive. Figure 3-16 shows the
PCI interrupt mapping for the master/slave 8259 interrupt
controller.
IRQ[13,8,0]
4
Level/Edge
Sensitivity
3
12
4D0h/4D1h
ICW1
16
IRQ3
IRQ4
MASTER/SLAVE
8259 PIC
1
IRQ15
INTR
Figure 3-16. PCI and IRQ Interrupt Mapping
Table 3-45. PCI Interrupt Steering Registers
Bit
Description
F0 Index 5Ch
7:4
Reset Value = 00h
INTB# Target Interrupt:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
3:0
PCI Interrupt Steering Register 1 (R/W)
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
INTA# Target Interrupt:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
‘
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
Note: The target interrupt must first be configured as level sensitive via I/O Port 4D0h and 4D1h in order to maintain PCI interrupt
compatibility
F0 Index 5Dh
7:4
Reset Value = 00h
INTD# Target Interrupt:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
3:0
PCI Interrupt Steering Register 2 (R/W)
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
INTC# Target Interrupt:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
Note: The target interrupt must first be configured as level sensitive via I/O Port 4D0h and 4D1h in order to maintain PCI interrupt
compatibility
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Table 3-46. Interrupt Edge/Level Select Registers
Bit
Description
I/O Port 4D0h
Interrupt Edge/Level Select Register 1 (R/W)
Reset Value = 00h
7
IRQ7 Edge or Level Select: Selects PIC IRQ7 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
6
IRQ6 Edge or Level Select: Selects PIC IRQ6 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
5
IRQ5 Edge or Level Select: Selects PIC IRQ5 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
4
IRQ4 Edge or Level Select: Selects PIC IRQ4 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
3
IRQ3 Edge or Level Select: Selects PIC IRQ3 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
2
Reserved: Set to 0.
1
IRQ1 Edge or Level Select: Selects PIC IRQ1 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
0
Reserved: Set to 0.
Notes: 1. If ICW1 - bit 3 in the PIC is set as level, it overrides this setting.
2. This bit is provided to configure a PCI interrupt mapped to IRQ[x] on the PIC as level-sensitive (shared).
I/O Port 4D1h
Interrupt Edge/Level Select Register 2 (R/W)
Reset Value = 00h
7
IRQ15 Edge or Level Select: Selects PIC IRQ15 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
6
IRQ14 Edge or Level Select: Selects PIC IRQ14 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
5
Reserved: Set to 0.
4
IRQ12 Edge or Level Select: Selects PIC IRQ12 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
3
IRQ11 Edge or Level Select: Selects PIC IRQ11 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
2
IRQ10 Edge or Level Select: Selects PIC IRQ10 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
1
IRQ9 Edge or Level Select: Selects PIC IRQ9 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
0
Reserved: Set to 0.
Notes: 1. If ICW1 - bit 3 in the PIC is set as level, it overrides this setting.
2. This bit is provided to configure a PCI interrupt mapped to IRQ[x] on the PIC as level-sensitive (shared).
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.5 I/O Ports 092h and 061h System Control
The CS5530 supports control functions of I/O Ports 092h
(Port A) and 061h (Port B) for PS/2 compatibility. I/O Port
092h allows a fast assertion of the A20M# or CPU_RST.
I/O Port 061h controls NMI generation and reports system
status. Table 3-47 shows these register bit formats.
The CS5530 does not use a pin to control A20 Mask
when used together with a GXLV processor. Instead, it
generates an SMI for every internal change of the A20M#
state and the SMI handler sets the A20M# state inside the
CPU. This method is used for both the Port 092h (PS/2)
and Port 061h (keyboard) methods of controlling A20M#.
Table 3-47. I/O Ports 061h and 092h
Bit
Description
I/O Port 061h
7
Port B Control Register (R/W)
Reset Value = 00x01100b
PERR#/SERR# Status (Read Only): Was a PCI bus error (PERR#/ SERR#) asserted by a PCI device or by CS5530?
0 = No; 1 = Yes.
This bit can only be set if ERR_EN is set 0. This bit is set 0 after a write to ERR_EN with a 1 or after reset.
6
IOCHK# Status (Read Only): Is an I/O device reporting an error to the CS5530? 0 = No; 1 = Yes.
This bit can only be set if IOCHK_EN is set 0. This bit is set 0 after a write to IOCHK_EN with a 1 or after reset.
5
PIT OUT2 State (Read Only): This bit reflects the current status of the PIT Timer2-OUT2.
4
Toggle (Read Only): This bit toggles on every falling edge of Counter 1 (OUT1).
3
IOCHK Enable:
0 = Generates an NMI if IOCHK# is driven low by an I/O device to report an error. Note that NMI is under SMI control.
1 = Ignores the IOCHK# input signal and does not generate NMI.
2
PERR#/ SERR# Enable: Generate an NMI if PERR#/ SERR# is driven active to report an error:
0 = Enable; 1 = Disable
1
PIT Counter2 (SPKR): 0 = Forces Counter 2 output (OUT2) to zero. 1 = Allows Counter 2 output (OUT2) to pass to the
speaker
0
PIT Counter2 Enable: 0 = Sets GATE2 input low. 1 = Sets GATE2 input high.
I/O Port 092h
7:2
Port A Control Register (R/W)
Reset Value = 02h
Reserved: Set to 0.
1
A20M# SMI Assertion: Assert A20# SMI: 0 = Enable; 1 = Disable.
0
Fast CPU Reset: WM_RST SMI is asserted to the BIOS: 0 = Disable; 1 = Enable.
This bit must be cleared before the generation of another reset.
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3.5.5.1 I/O Port 092h System Control
I/O Port 092h allows for a fast keyboard assertion of an
A20# SMI and a fast keyboard CPU reset. Decoding for
this register may be disabled via F0 Index 52h[3] (Table 348).
occurs, the BIOS jumps to the Warm Reset vector. This bit
remains set until the CS5530 is externally reset, or this bit
is cleared by program control. Note that Warm Reset is
not a pin, it is under SMI control.
3.5.5.2 I/O Port 061h System Control
Through I/O Port 061h, the speaker output can be
enabled, NMI from IOCHK# or SERR# can be enabled,
the status of IOCHK# and SERR# can be read, and the
state of the speaker data (Timer2 output) and refresh toggle (Timer1 output) can be read back. Note that NMI is
under SMI control.
The assertion of a fast keyboard A20# SMI is controlled
by either I/O Port 092h or by monitoring for the keyboard
command sequence (see Section 3.5.6.1 “Fast Keyboard
Gate Address 20 and CPU Reset” on page 103). If bit 1 of
I/O Port 092h is cleared, the CS5530 internally asserts an
A20M# SMI, which in turn causes an SMI to the processor. If bit 1 is set, A20M# SMI is internally deasserted
again causing an SMI.
3.5.5.3 SMI Generation for NMI
Figure 3-17 shows how the CS5530 can generate an SMI
for an NMI. Note that NMI is not a pin.
The assertion of a fast keyboard reset (WM_RST SMI) is
controlled by bit 0 in I/O Port 092h or by monitoring for the
keyboard command sequence. If bit 0 is changed from a 0
to a 1, the CS5530 generates a reset to the processor by
generating a WM_RST SMI. When the WM_RST SMI
Table 3-48. I/O Port 092h Decode Enable Bit
Bit
Description
F0 Index 52h
3
ROM/AT Logic Control Register (R/W)
Reset Value = F8h
Enable Port 092h Decode (Port A): I/O Port 092h decode and the logical functions: 0 = Disable; 1 = Enable.
Parity Errors
AND
System Errors
F0 Index 04h[6]
F0 Index 04h[8]
AND
F0 Index 41h[5]
I/O Port 061h[3]
AND
NMI
SERR#
OR
AND
IOCHK#
PERR#
I/O Port 061h[2]
F0 Index 04h: PCI Command Register
Bit 6 = PE (Parity Error Enable)
Bit 8 = SERR# (SERR# Enable)
AND
NMI
F0 Index 41h: PCI Function Control Register 2
Bit 5 = PES (PERR# Signals SERR#)
OR
I/O Port 061h: Port B
Bit 2 = ERR_EN (PERR#/SERR# enable)
Bit 3 = IOCHK_EN (IOCHK Enable)
AND
I/O Port 070h[7]
SMI
I/O Port 070h: RTC Index Register (WO)
Bit 7 = NMI (NMI Enable)
Figure 3-17. SMI Generation for NMI
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.6 Keyboard Interface Function
The CS5530 actively decodes the keyboard controller I/O
Ports 060h and 064h, and generate an ISA I/O cycle with
KBROMCS# asserted. Access to I/O Ports 062h and
066h must be enabled for KBROMCS# to be asserted.
The CS5530 also actively decodes the keyboard controller I/O Ports 062h and 066h if F0 Index 5Bh[7] is set. Key-
board positive decoding can be disabled if F0 Index
5Ah[1] is cleared. Table 3-49 shows these two decoding
bits.
Table 3-50 lists the standard keyboard control I/O registers and their bit formats.
.
Table 3-49. Decode Control Registers
Bit
Description
F0 Index 5Ah
1
Decode Control Register 1 (R/W)
Reset Value = 03h
Keyboard Controller Positive Decode: Selects positive or subtractive decoding for accesses to I/O Port 060h and 064h
(and 062h/066h if enabled): 0 = Subtractive; 1 = Positive.
Note: Positive decoding by the CS5530 speeds up the I/O cycle time. These I/O Ports do not exist in the CS5530. It is assumed that
if positive decode is enabled, the port exists on the ISA bus.
F0 Index 5Bh
7
Decode Control Register 2 (R/W)
Reset Value = 20h
Keyboard I/O Port 062h/066h Decode: This alternate port to the keyboard controller is provided in support of the
8051SL notebook keyboard controller mailbox: 0 = Disable; 1 = Enable.
Note: Positive decoding by the CS5530 speeds up the I/O cycle time. The Keyboard, LPT3, LPT2, and LPT1 I/O Ports do not exist in
the CS5530. It is assumed that if positive decode is enabled, the port exists on the ISA bus.
Table 3-50. External Keyboard Controller Registers
Bit
Description
I/O Port 060h (R/W)
External Keyboard Controller Data Register
Keyboard Controller Data Register: All accesses to this port are passed to the ISA bus. If the fast keyboard gate A20 and reset features are enabled through bit 7 of the ROM/AT Logic Control Register (F0 Index 52h[7]), the respective sequences of writes to this
port assert the A20M# pin or cause a warm CPU reset.
I/O Port 062h (R/W)
External Keyboard Controller Mailbox Register
Keyboard Controller Mailbox Register: Accesses to this port asserts KBROMCS# if the I/O Port 062h/066h decode is enabled
through bit 7 of the Decode Control Register 2 (F0 Index 5Bh[7]).
I/O Port 064h (R/W)
External Keyboard Controller Command Register
Keyboard Controller Command Register: All accesses to this port are passed to the ISA bus. If the fast keyboard gate A20 and
reset features are enabled through bit 7 of the ROM/AT Logic Control Register (F0 Index 52h[7]), the respective sequences of writes
to this port assert the A20M# pin or cause a warm CPU reset.
I/O Port 066h (R/W)
External Keyboard Controller Mailbox Register
Keyboard Controller Mailbox Register: Accesses to this port assert KBROMCS# if the I/O Port 062h/066h decode is enabled
through bit 7 of the Decode Control Register 2 (F0 Index 5Bh[7]).
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3.5.6.1
Fast Keyboard Gate Address 20 and CPU
Reset
The CS5530 monitors the keyboard I/O Ports 064h and
060h for the fast keyboard A20M# and CPU reset control
sequences. If a write to I/O Port 060h[1] = 1 after a write
takes place to I/O Port 064h with data of D1h, then the
CS5530 asserts the A20M# signal. A20M# remains
asserted until cleared by:
The CS5530 also monitors the keyboard ports for the
CPU reset control sequence. If a write to I/O Port 060h
with data bit 0 set occurs after a write to I/O Port 064h
with data of D1h, the CS5530 asserts a WM_RST SMI.
The fast keyboard A20M# and CPU reset can be disabled
through F0 Index 52h[7]. By default, bit 7 is cleared, and
the fast keyboard A20M# and CPU reset monitor logic is
active. If bit 7 is clear, the CS5530 forwards the commands to the keyboard controller.
(1) a write to bit 1 of I/O Port 092h,
By default, the CS5530 forces the deassertion of A20M#
during a warm reset. This action may be disabled if F0
Index 52h[4] is cleared.
(2) a CPU reset of some kind, or
(3) write to I/O Port 060h[1] = 0 after a write takes place
to I/O Port 064h with data of D1h,
Table 3-51. A20 Associated Programming Bits
Bit
Description
F0 Index 52h
7
ROM/AT Logic Control Register (R/W)
Reset Value = F8h
Snoop Fast Keyboard Gate A20 and Fast Reset: Enables the snoop logic associated with keyboard commands for
A20 Mask and Reset: 0 = Disable; 1 = Enable (snooping).
If disabled, the keyboard controller handles the commands.
4
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Enable A20M# Deassertion on Warm Reset: Force A20M# high during a Warm Reset (guarantees that A20M# is deasserted regardless of the state of A20): 0 = Disable; 1 = Enable.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.5.7 External Real-Time Clock Interface
I/O Ports 070h and 071h decodes are provided to interface to an external real-time clock controller. I/O Port
070h, a write only port, is used to set up the address of
the desired data in the controller. This causes the address
to be placed on the ISA data bus, and the RTCALE signal
to be triggered. A read of I/O Port 071h causes an ISA I/O
read cycle to be performed while asserting the RTCCS#
signal. A write to I/O Port 071h causes an ISA I/O write
cycle to be performed with the desired data being placed
on the ISA bus and the RTCCS# signal to be asserted.
RTCCS#/SMEMW# and RTCALE/SMEMR# are multiplexed pins. The function selection is made through F0
Index 53h[2].
The CS5530 also provides the RTC Index Shadow Register (F0 Index BBh) to store the last write to I/O Port 070h.
Table 3-52 shows the bit formats for the associated registers for interfacing with an external real-time clock.
SD[7:0]
IOW#
IOR#
IRQ8#
RTC
RTCCS#/SMEMW#
RTCALE/SMEMR#
The connection between the CS5530 and an external
real-time clock is shown in Figure 3-18.
Figure 3-18. External RTC interface
Table 3-52. Real-Time Clock Registers
Bit
Description
I/O Port 070h
7
6:0
RTC Address Register (WO)
NMI Mask: 0 = Enable; 1 = Mask.
RTC Register Index: A write of this register sends the data out on the ISA bus and also causes RTCALE to be
triggered.
Note: This register is shadowed within the CS5530 and is read through the RTC Shadow Register (F0 Index BBh).
I/O Port 071h
RTC Data Register (R/W)
A read of this register returns the value of the register indexed by the RTC Address Register plus initiates a RTCCS#.
A write of this register sets the value into the register indexed by the RTC Address Register plus initiates a RTCCS#.
F0 Index BBh
7:0
Reset Value = xxh
RTC Index Shadow (Read Only): The RTC Shadow register contains the last written value of the RTC Index
register (I/O Port 070h).
F0 Index 53h
2
RTC Index Shadow Register (RO)
Alternate CPU Support Register (R/W)
Reset Value = 00h
RTC Enable and RTC Pin Configuration: 0 = SMEMW# (Pin AF3) and SMEMR# (Pin AD4), RTC decode disabled
1 = RTCCS# (Pin AF3) and RTCALE (Pin AD4), RTC decode enabled.
Note: Shadow register is independent of the enable register.
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3.6
IDE CONTROLLER
The CS5530 integrates a fully-buffered, 32-bit, ANSI ATA4-compliant (Ultra DMA/33) IDE interface. The IDE interface supports two channels, primary and secondary, each
supporting two devices that can operate in PIO Modes 1,
2, 3, 4, Multiword DMA, or Ultra DMA/33.
can be independently programmed allowing high-speed
IDE peripherals to coexist on the same channel as older,
compatible devices.
The CS5530 also provides a software-accessible buffered
reset signal to the IDE drive, F0 Index 44h[3:2] (Table 353). The IDE_RST# signal is driven low during reset to the
CS5530 and can be driven low or high as needed for
device-power-off conditions.
The IDE interface provides a variety of features to optimize system performance, including 32-bit disk access,
post write buffers, bus master, Multiword DMA, lookahead read buffer, and prefetch mechanism for each
channel respectively.
3.6.1 IDE Interface Signals
The CS5530 has two completely separate IDE control signals, however, the IDE_RST#, IDE_ADDR[2:0] and
IDE_DATA[15:0] are shared. The connections between
the CS5530 and IDE devices are shown as Figure 3-19.
The IDE interface timing is completely programmable.
Timing control covers the command active and recover
pulse widths, and command block register accesses. The
IDE data-transfer speed for each device on each channel
Table 3-53. IDE Reset Bits
Bit
Description
F0 Index 44h
3
Reset Control Register (R/W)
Reset Value = xx000000b
IDE Controller Reset: Reset the IDE Controller: 0 = Disable; 1 = Enable.
Write 0 to clear. This bit is level-sensitive and must be cleared after the reset is enabled.
2
IDE Reset: Reset IDE bus: 0 = Disable; 1 = Enable.
Write 0 to clear. This bit is level-sensitive and must be cleared after the reset is enabled.
IDE_DATA[15:0]
IDE_ADDR[2:0]
Primary
Channel
IRQ14
Secondary
Channel
IRQ15
IDE_CS0#, IDE_DREQ0,
IDE_DACK0#, IDE_IORDY0,
IDE_IOR0#, IDE_IOW0#
IDE_RST#
IDE_CS1#, IDE_DREQ1,
IDE_DACK1#, IDE_IORDY1,
IDE_IOR1#, IDE_IOW1#
Figure 3-19. CS5530 and IDE Channel Connections
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
The PIO portion of the IDE registers is enabled through:
3.6.2 IDE Configuration Registers
Registers for configuring the IDE interface are accessed
through F2 Index 20h, the Base Address Register
(F2BAR) in Function 2. F2BAR sets the base address for
the IDE Controllers Configuration Registers as shown in
Table 3-54. For complete bit information, refer to Section
4.3.3 “IDE Controller Registers - Function 2” on page 184.
• Channel 0 Drive 0 Programmed I/O Register
(F2BAR+I/O Offset 20h)
• Channel 0 Drive 1 Programmed I/O Register
(F2BAR+I/O Offset 28h)
• Channel 1 Drive 0 Programmed I/O Register
(F2BAR+I/O Offset 30h)
The following subsections discuss CS5530 operational/programming details concerning PIO, Bus Master,
and Ultra DMA/33 modes.
• Channel 1 Drive 1 Programmed I/O Register
(F2BAR+I/O Offset 38h)
3.6.2.1 PIO Mode
The IDE data port transaction latency consists of address
latency, asserted latency and recovery latency. Address
latency occurs when a PCI master cycle targeting the IDE
data port is decoded, and the IDE_ADDR[2:0] and
IDE_CS# lines are not set up. Address latency provides
the setup time for the IDE_ADDR[2:0] and IDE_CS# lines
prior to IDE_IOR# and IDE_IOW#.
The IDE channels and devices can be individually programmed to select the proper address setup time,
asserted time, and recovery time.
Asserted latency consists of the I/O command strobe
assertion length and recovery time. Recovery time is provided so that transactions may occur back-to-back on the
IDE interface without violating minimum cycle periods for
the IDE interface.
F2BAR+I/O Offset 24h[31] (Channel 0 Drive 0 — DMA
Control Register) sets the format of the PIO register. If bit
31 = 0, Format 0 is used and it selects the slowest PIOMODE (bits [19:16]) per channel for commands. If bit 31 =
1, Format 1 is used and it allows independent control of
command and data.
If IDE_IORDY is asserted when the initial sample point is
reached, no wait states are added to the command strobe
assertion length. If IDE_IORDY is negated when the initial
sample point is reached, additional wait states are added.
Also listed in the bit formats are recommended values for
the different PIO modes.
The bit formats for these registers are shown in Table 355. Note that there are different bit formats for each of the
PIO programming registers depending on the operating
format selected: Format 0 or Format 1.
Note:
Recovery latency occurs after the IDE data port transactions have completed. It provides hold time on the
IDE_ADDR[2:0] and IDE_CS# lines with respect to the
read and write strobes (IDE_IOR# and IDE_IOW#).
These are only recommended settings and are
not 100% tested.
Table 3-54. Base Address Register (F2BAR) for IDE Support Registers
Bit
Description
F2 Index 20h-23h
Base Address Register — F2BAR (R/W)
Reset Value = 00000001h
This register sets the base address of the I/O mapped bus mastering IDE and controller registers. Bits [6:0] are read only (0000 001),
indicating a 128 byte I/O address range. Refer to Table 4-18 for the IDE configuration registers bit formats and reset values.
31:7
Bus Mastering IDE Base Address
6:0
Address Range (Read Only)
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Table 3-55. PIO Programming Registers
Bit
Description
F2BAR+I/O Offset 20h-23h
Channel 0 Drive 0 PIO Register (R/W)
Reset Value = 0000E132h (Note)
If Offset 24h[31] = 0, Format 0: Selects slowest PIOMODE per channel for commands.
Format 0 settings for: PIO Mode 0 = 00009172h
PIO Mode 1 = 00012171h
PIO Mode 2 = 00020080h
PIO Mode 3 = 00032010h
PIO Mode 4 = 00040010h
31:20
Reserved: Set to 0.
19:16
PIOMODE: PIO mode
15:12
t2I: Recovery time (value + 1 cycle)
11:8
t3: IDE_IOW# data setup time (value + 1 cycle)
7:4
t2W: IDE_IOW# width minus t3 (value + 1 cycle)
3:0
t1: Address Setup Time (value + 1 cycle)
If Offset 24h[31] = 1, Format 1: Allows independent control of command and data.
Format 1 settings for: PIO Mode 0 = 9172D132h
PIO Mode 1 = 21717121h
PIO Mode 2 = 00803020h
PIO Mode 3 = 20102010h
PIO Mode 4 = 00100010h
31:28
t2IC: Command cycle recovery time (value + 1 cycle)
27:24
t3C: Command cycle IDE_IOW# data setup (value + 1 cycle)
23:20
t2WC: Command cycle IDE_IOW# pulse width minus t3 (value + 1 cycle)
19:16
t1C: Command cycle address setup time (value + 1 cycle)
15:12
t2ID: Data cycle recovery time (value + 1 cycle)
11:8
t3D: Data cycle IDE_IOW# data setup (value + 1 cycle)
7:4
t2WD: Data cycle IDE_IOW# pulse width minus t3 (value + 1 cycle)
3:0
t1D: Data cycle address Setup Time (value + 1 cycle)
Note: The reset value of this register is not a valid PIO Mode.
F2BAR+I/O Offset 28h-2Bh
Channel 0 Drive 1 PIO Register (R/W)
Reset Value = 0000E132h
Channel 0 Drive 1 Programmed I/O Control Register: Refer to F2BAR+I/O Offset 20h for bit descriptions.
F2BAR+I/O Offset 30h-33h
Channel 1 Drive 0 PIO Register (R/W)
Reset Value = 0000E132h
Channel 1 Drive 0 Programmed I/O Control Register: Refer to F2BAR+I/O Offset 20h for bit descriptions.
F2BAR+I/O Offset 38h-3Bh
Channel 1 Drive 1 PIO Register (R/W)
Reset Value = 0000E132h
Channel 1 Drive 1 Programmed I/O Control Register: Refer to F2BAR+I/O Offset 20h for bit descriptions.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.6.2.2 Bus Master Mode
Two IDE bus masters are provided to perform the data
transfers for the primary and secondary channels. The
CS5530 off-loads the CPU and improves system performance in multitasking environments.
Physical Region Descriptor Table Address
Before the controller starts a master transfer it is given a
pointer (shown in Table 3-56) to a Physical Region
Descriptor Table. This pointer sets the starting memory
location of the Physical Region Descriptors (PRDs). The
PRDs describe the areas of memory that are used in the
data transfer. The PRDs must be aligned on a 4-byte
boundary and the table cannot cross a 64 KB boundary in
memory.
The bus master mode programming interface is an extension of the standard IDE programming model. This means
that devices can always be dealt with using the standard
IDE programming model, with the master mode functionality used when the appropriate driver and devices are
present. Master operation is designed to work with any
IDE device that supports DMA transfers on the IDE bus.
Devices that work in PIO mode can only use the standard
IDE programming model.
Primary and Secondary IDE Bus Master Registers
The IDE Bus Master Registers for each channel (primary
and secondary) have an IDE Bus Master Command Register and Bus Master Status Register. These registers
must be accessed only individually; a 32-bit DWORD
access attempting to include both the Command and Status registers may not operate correctly. Bit formats of
these registers are given in Table 3-57.
The IDE bus masters use a simple scatter/gather mechanism allowing large transfer blocks to be scattered to or
gathered from memory. This cuts down on the number of
interrupts to and interactions with the CPU.
Table 3-56. IDE Bus Master PRD Table Address Registers
Bit
Description
F2BAR+I/O Offset 04h-07h
31:2
IDE Bus Master 0 PRD Table Address — Primary (R/W)
Reset Value = 00000000h
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for IDE Bus Master 0.
When written, this register points to the first entry in a PRD table. Once IDE Bus Master 0 is enabled (Command Register
bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
F2BAR+I/O Offset 0Ch-0Fh
31:2
IDE Bus Master 1 PRD Table Address — Secondary (R/W)
Reset Value = 00000000h
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for IDE Bus Master 1.
When written, this register points to the first entry in a PRD table. Once IDE Bus Master 1 is enabled (Command Register
bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
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Table 3-57. IDE Bus Master Command and Status Registers
Bit
Description
F2BAR+I/O Offset 00h
7:4
3
IDE Bus Master 0 Command Register — Primary (R/W)
Reset Value = 00h
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Sets the direction of bus master transfers: 0 = PCI reads performed;
1 = PCI writes performed.
This bit should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the bus master: 0 = Disable master; 1 = Enable master.
Bus master operations can be halted by setting bit 0 to 0. Once an operation has been halted, it can not be resumed. If bit
0 is set to 0 while a bus master operation is active, the command is aborted and the data transferred from the drive is discarded. This bit should be reset after completion of data transfer.
F2BAR+I/O Offset 02h
7
IDE Bus Master 0 Status Register — Primary (R/W)
Simplex Mode (Read Only): Can both the primary and secondary channel operate independently? 0 = Yes;
1 = No (simplex mode)
6
Drive 1 DMA Capable: Allow Drive 1 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
5
Drive 0 DMA Capable: Allow Drive 0 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
4:3
2
Reset Value = 00h
Reserved: Set to 0. Must return 0 on reads.
Bus Master Interrupt: Has the bus master detected an interrupt? 0 = No; 1 = Yes. Write 1 to clear.
1
Bus Master Error: Has the bus master detected an error during data transfer? 0 = No; 1 = Yes. Write 1 to clear.
0
Bus Master Active (Read Only): Is the bus master active? 0 = No; 1 = Yes.
F2BAR+I/O Offset 08h
7:4
3
IDE Bus Master 1 Command Register — Secondary (R/W)
Reset Value = 00h
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Sets the direction of bus master transfers: 0 = PCI reads performed;
1 = PCI writes performed.
This bit should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the bus master: 0 = Disable master; 1 = Enable master.
Bus master operations can be halted by setting bit 0 = 0. Once an operation has been halted, it can not be resumed. If bit
0 is set to 0 while a bus master operation is active, the command is aborted and the data transferred from the drive is discarded. This bit should be reset after completion of data transfer.
F2BAR+I/O Offset 0Ah
7
Bus Master 1 Status Register — Secondary (R/W)
Simplex Mode (Read Only): Can both the primary and secondary channel operate independently? 0 = Yes;
1 = No (simplex mode)
6
Drive 1 DMA Capable: Allow Drive 1 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
5
Drive 0 DMA Capable: Allow Drive 0 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
4:3
2
Reset Value = 00h
Reserved: Set to 0. Must return 0 on reads.
Bus Master Interrupt: Has the bus master detected an interrupt? 0 = No; 1 = Yes. Write 1 to clear.
1
Bus Master Error: Has the bus master detected an error during data transfer? 0 = No; 1 = Yes. Write 1 to clear.
0
Bus Master Active (Read Only): Is the bus master active? 0 = No; 1 = Yes.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Physical Region Descriptor Format
Each physical memory region to be transferred is
described by a Physical Region Descriptor (PRD) as illustrated in Table 3-58. When the bus master is enabled
(Command Register bit 0 = 1), data transfer proceeds until
each PRD in the PRD table has been transferred. The bus
master does not cache PRDs.
3)
Software must fill the buffers pointed to by the PRDs
with IDE data.
4)
Write 1 to the Bus Master Interrupt bit and Bus
Master Error (Status Register bits 2 and 1) to clear
the bits.
5)
Set the correct direction to the Read or Write Control
bit (Command Register bit 3).
The PRD table consists of two DWORDs. The first
DWORD contains a 32-bit pointer to a buffer to be transferred. This pointer must be 16-byte aligned. The second
DWORD contains the size (16 bits) of the buffer and the
EOT flag. The size must be in multiples of 16 bytes. The
EOT bit (bit 31) must be set to indicate the last PRD in the
PRD table.
Engage the bus master by writing a “1” to the Bus
Master Control bit (Command Register bit 0).
The bus master reads the PRD entry pointed to by
the PRD Table Address Register and increments the
address by 08h to point to the next PRD. The transfer
begins.
Programming Model
The following steps explain how to initiate and maintain a
bus master transfer between memory and an IDE device.
1)
Software creates a PRD table in system memory.
Each PRD entry is 8 bytes long, consisting of a base
address pointer and buffer size. The maximum data
that can be transferred from a PRD entry is 64 KB. A
PRD table must be aligned on a 4-byte boundary.
The last PRD in a PRD table must have the EOT bit
set.
2)
Software loads the starting address of the PRD table
by programming the PRD Table Address Register.
6)
The bus master transfers data to/from memory
responding to bus master requests from the IDE
device. At the completion of each PRD, the bus
master’s next response depends on the settings of
the EOT flag in the PRD. If the EOT bit is set, then the
IDE bus master clears the Bus Master Active bit
(Status Register bit 0) and stops. If any errors
occurred during the transfer, the bus master sets the
Bus Master Error bit Status Register bit 1).
Table 3-58. Physical Region Descriptor Format
Byte 3
Byte 2
Byte 1
DWORD 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
0
1
Byte 0
8
Memory Region Physical Base Address [31:4] (IDE Data Buffer)
E
O
T
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Reserved
Size [15:4]
110
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Revision 4.1
3.6.2.3 Ultra DMA/33 Mode
The CS5530 supports Ultra DMA/33. It utilizes the standard IDE Bus Master functionality to interface, initiate and
control the transfer. Ultra DMA/33 definition also incorporates a Cyclic Redundancy Checking (CRC) error checking protocol to detect errors.
The data transfer phase continues the burst transfers with
the CS5530 and the IDE via providing data, toggling
STROBE and DMARDY#. The IDE_DATA[15:0] is latched
by receiver on each rising and falling edge of STROBE.
The transmitter can pause the burst cycle by holding
STROBE high or low, and resume the burst cycle by again
toggling STROBE. The receiver can pause the burst cycle
by negating DMARDY# and resumes the burst cycle by
asserting DMARDY#.
The Ultra DMA/33 protocol requires no extra signal pins
on the IDE connector. The CS5530 redefines three standard IDE control signals when in Ultra DMA/33 mode.
These definitions are shown in Table 3-59.
The current burst cycle can be terminated by either the
transmitter or the receiver. A burst cycle must first be
paused as described above before it can be terminated.
The CS5530 can then stop the burst cycle by asserting
STOP, with the IDE device acknowledging by negating
IDE_DREQ. The IDE device then stops the burst cycle by
negating IDE_DREQ and the CS5530 acknowledges by
asserting STOP. The transmitter then drives the STROBE
signal to a high level. The CS5530 then puts the result of
the CRC calculation onto the IDE_DATA[15:0] while deasserting IDE_DACK#. The IDE device latches the CRC
value on the rising edge of IDE_DACK#.
Table 3-59. Ultra DMA/33 Signal Definitions
CS5530 IDE
Channel Signal
Ultra DMA/33
Read Cycle
Ultra DMA/33
Write Cycle
IDE_IOW#
STOP
STOP
IDE_IOR#
DMARDY#
STROBE
IDE_IORDY
STROBE
DMARDY#
All other signals on the IDE connector retain their functional definitions during the Ultra DMA/33 operation.
The CRC value is used for error checking on Ultra
DMA/33 transfers. The CRC value is calculated for all
data by both the CS5530 and the IDE device during the
Ultra DMA/33 burst transfer cycles. This result of the CRC
calculation is defined as all data transferred with a valid
STROBE edge while IDE_DACK# is asserted. At the end
of the burst transfer, the CS5530 drives the result of the
CRC calculation onto IDE_DATA[15:0] which is then
strobed by the deassertion of IDE_DACK#. The IDE
device compares the CRC result of the CS5530 to its own
and reports an error if there is a mismatch.
IDE_IOW# is defined as STOP for both read and write
transfers to request to stop a transaction.
IDE_IOR# is redefined as DMARDY# for transferring data
from the IDE device to the CS5530. It is used by the
CS5530 to signal when it is ready to transfer data and to
add wait states to the current transaction. IDE_IOR# signal is defined as STROBE for transferring data from the
CS5530 to the IDE device. It is the data strobe signal
driven by the CS5530 on which data is transferred during
each rising and falling edge transition.
The timings for Ultra DMA/33 are programmed into the
DMA control registers:
IDE_IORDY is redefined as STROBE for transferring data
from the IDE device to the CS5530 during a read cycle. It
is the data strobe signal driven by the IDE device on which
data is transferred during each rising and falling edge
transition. IDE_IORDY is defined as DMARDY# during a
write cycle for transferring data from the CS5530 to the
IDE device. It is used by the IDE device to signal when it is
ready to transfer data and to add wait states to the current
transaction.
• Channel 0 Drive 0 DMA Control Register (F2BAR+I/O
Offset 24h)
• Channel 0 Drive 1 DMA Control Register (F2BAR+I/O
Offset 2Ch)
• Channel 1 Drive 0 DMA Control Register (F2BAR+I/O
Offset 34h)
• Channel 1 Drive 1 DMA Control Register (F2BAR+I/O
Offset 3Ch)
Ultra DMA/33 data transfer consists of three phases, a
startup phase, a data transfer phase and a burst termination phase.
The bit formats for these registers are given in Table 3-60.
Note that F2BAR+I/O Offset 24h[20] is used to select
either Multiword or Ultra DMA mode. Bit 20 = 0 selects
Multiword DMA mode. If bit 20 = 1, then Ultra DMA/33
mode is selected. Once mode selection is made using this
bit, the remaining DMA Control Registers also operate in
the selected mode.
The IDE device begins the startup phase by asserting
IDE_DREQ. When ready to begin the transfer, the
CS5530 asserts IDE_DACK#. When IDE_DACK# is
asserted, the CS5530 drives IDE_CS0# and IDE_CS1#
asserted, and IDE_ADDR[2:0] low. For write cycles, the
CS5530 negates STOP, waits for the IDE device to assert
DMARDY#, and then drives the first data word and
STROBE signal. For read cycles, the CS5530 negates
STOP, and asserts DMARDY#. The IDE device then
sends the first data word and asserts STROBE.
Revision 4.1
Also listed in the bit formats are recommended values for
both Multiword DMA Modes 0-2 and Ultra DMA/33 Modes
0-2.
Note:
111
These are only recommended settings and are
not 100% tested.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-60. MDMA/UDMA Control Registers
Bit
Description
F2BAR+I/O Offset 24h-27h
Channel 0 Drive 0 DMA Control Register (R/W)
Reset Value = 00077771h
If bit 20 = 0, Multiword DMA
Settings for: Multiword DMA Mode 0 = 00077771h
Multiword DMA Mode 1 = 00012121h
Multiword DMA Mode 2 = 00002020h
31
30:21
20
PIO Mode Format: 0 = Format 0; 1 = Format 1
Reserved: Set to 0.
DMA Select: DMA operation: 0 = Multiword DMA; 1 = Ultra DMA/33.
19:16
tKR: IDE_IOR# recovery time (4-bit) (value + 1 cycle)
15:12
tDR: IDE_IOR# pulse width (value + 1 cycle)
11:8
tKW: IDE_IOW# recovery time (4-bit) (value + 1 cycle)
7:4
tDW: IDE_IOW# pulse width (value + 1 cycle)
3:0
tM: IDE_CS0#/CS1# to IDE_IOR#/IOW# setup; IDE_CS0#/CS1# setup to IDE_DACK0#/DACK1#
If bit 20 = 1, Ultra DMA/33
Settings for: Ultra DMA/33 Mode 0 = 00921250h
Ultra DMA/33 Mode 1 = 00911140h
Ultra DMA/33 Mode 2 = 00911030h
31
30:21
20
19:16
PIO Mode Format: 0 = Format 0; 1 = Format 1
Reserved: Set to 0.
DMA Select: DMA operation: 0 = Multiword DMA, 1 = Ultra DMA/33.
tCRC: CRC setup UDMA in IDE_DACK# (value + 1 cycle) (for host terminate CRC setup = tMLI + tSS)
15:12
tSS: UDMA out (value + 1 cycle)
11:8
tCYC: Data setup and cycle time UDMA out (value + 2 cycles)
7:4
tRP: Ready to pause time (value + 1 cycle). Note: tRFS + 1 tRP on next clock.
3:0
tACK: IDE_CS0#/CS1# setup to IDE_DACK0#/DACK1# (value + 1 cycle)
F2BAR+I/O Offset 2Ch-2Fh
Channel 0 Drive 1 DMA Control Register (R/W)
Reset Value = 00017771h
Channel 0 Drive 1 MDMA/UDMA Control Register: Refer to F2BAR+I/O Offset 24h for bit descriptions.
Note: Once the PIO Mode Format is selected in F2BAR+I/O Offset 24h[31], bit 31 of this register is defined as reserved, read only.
F2BAR+I/O Offset 34h-37h
Channel 1 Drive 0 DMA Control Register (R/W)
Reset Value = 00017771h
Channel 1 Drive 0 MDMA/UDMA Control Register: Refer to F2BAR+I/O Offset 24h for bit descriptions.
Note: Once the PIO Mode Format is selected in F2BAR+I/O Offset 24h[31], bit 31 of this register is defined as reserved, read only.
F2BAR+I/O Offset 3Ch-3Fh
Channel 1 Drive 1 DMA Control Register (R/W)
Reset Value = 00017771h
Channel 1 Drive 1 MDMA/UDMA Control Register: Refer to F2BAR+I/O Offset 24h for bit descriptions.
Note: Once the PIO Mode Format is selected in F2BAR+I/O Offset 24h[31], bit 31 of this register is defined as reserved, read only.
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3.7
XPRESSAUDIO
Through XpressAUDIO, the CS5530 offers a combined
hardware/software support solution to meet industry standard audio requirements. XpressAUDIO uses Virtual System Architecture (VSA) technology along with additional
hardware features to provide the necessary support for
industry standard 16-bit stereo synthesis and OPL3 emulation.
• Trap accesses for serial input and output at COM2 (I/O
Port 2F8h-2FFh) or COM4 (I/O Port 2E8h-2EFh).
The hardware portion of XpressAUDIO is for transporting
streaming audio data to/from the system memory and an
AC97 codec. This hardware includes:
• Support is provided for software-generated IRQs on
IRQ 2, 3, 5, 7, 10, 11, 12, 13, 14, and 15.
• Support trapping for low (I/O Port 00h-0Fh) and/or high
(I/O Port C0h-DFh) DMA accesses.
• Support hardware status register reads in CS5530,
minimizing SMI overhead.
Included in the following subsections are details regarding
the registers used for configuring the audio interface. The
registers are accessed through F3 Index 10h, the Base
Address Register (F3BAR) in Function 3. F3BAR sets the
base address for XpressAUDIO support registers as
shown in Table 3-61.
• Six (three inbound/three outbound) buffered PCI bus
mastering engines that drive specific AC97 interface
slots.
• Interfaces to AC97 codecs (e.g., LM4548) for audio
input/output.
3.7.1 Subsystem Data Transport Hardware
The data transport hardware can be broadly divided into
two sections: bus mastering and the codec interface.
Additional hardware provides the necessary functionality
for VSA technology. This hardware includes the ability to:
• Generate an SMI to alert software to update required
data. An SMI is generated when either audio buffer is
half empty or full. If the buffers become completely
empty or full, the Empty bit is asserted.
3.7.1.1 Audio Bus Masters
The CS5530 audio hardware includes six PCI bus masters (three for input and three for output) for transferring
digitized audio between memory and the external codec.
With these bus master engines, the CS5530 off-loads the
CPU and improves system performance.
• Generate an SMI on I/O traps.
• Trap accesses for sound card compatibility at either I/O
Port 220h-22Fh, 240h-24Fh, 260h-26Fh, or 280h28Fh.
The programming interface defines a simple scatter/gather mechanism allowing large transfer blocks to be
scattered to or gathered from memory. This cuts down on
the number of interrupts to and interactions with the CPU.
• Trap accesses for FM compatibility at I/O Port 388h38Bh.
• Trap accesses for MIDI UART interface at I/O Port
300h-301h or 330h-331h.
Table 3-61. Base Address Register (F3BAR) for XpressAUDIO Registers
Bit
Description
F3 Index 10h-13h
Base Address Register — F3BAR (R/W)
Reset Value = 00000000h
This register sets the base address of the memory mapped audio interface control register block. This is a 4 KB block of registers
used to control the audio FIFO and codec interface, as well as to support SMIs produced by VSA technology. Bits [11:0] are read only
(0000 0000 0000), indicating a 4 KB memory address range. Refer to Table 4-20 for the bit formats and reset values of XpressAUDIO
registers.
31:12
Audio Interface Base Address
11:0
Address Range (Read Only)
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
The six bus masters that directly drive specific slots on the
AC97 interface:
• Audio Bus Master 4
- Output to codec
- PCI read
- 16-Bit
- Slot 6 or 11 (F3BAR+Memory Offset 08h[19] selects
slot)
• Audio Bus Master 0
- Output to codec
- PCI read
- 32-Bit
- Left and right channels
- Slots 3 and 4
• Audio Bus Master 5
- Input from codec
- PCI write
- 16-Bit
- Slot 6 or 11 (F3BAR+Memory Offset 08h[20] selects
slot)
• Audio Bus Master 1
- Input from codec
- PCI write
- 32-Bit
- Left and right channels
- Slots 3 and 4
Bus Master Audio Configuration Registers
The format for the bus master audio configuration registers is similar in that each bus master has a Command
Register, an SMI Status Register and a PRD Table
Address Register. Programming of the bus masters is
generic in many ways, although specific programming is
required of bit 3 in the Command Register. This bit selects
read or write control and is dependent upon which Audio
Bus Master is being programmed.
• Audio Bus Master 2
- Output to codec
- PCI read
- 16-Bit
- Slot 5
• Audio Bus Master 3
- Input from codec
- PCI write
- 16-Bit
- Slot 5
Table 3-62. Generic Bit Formats for Audio Bus Master Configuration Registers
Bit
Description
Command Register (R/W)
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master X: 0 = PCI reads performed;
1 = PCI writes performed.
This bit should not be changed when the bus master is active. The setting of this bit is dependent upon the assigned bus
master.
Note: Must be R/W as a byte.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master X: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must either
be paused or have reached EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior
including the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
SMI Status Register (RC)
7:2
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP (end of page) before software has cleared the
first? 0 = No; 1 = Yes.
If hardware encounters a second EOP before software has cleared the first, it causes the bus master to pause until this
register is read to clear the error.
Note: Must be R/W as a byte.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
PRD Table Address (R/W)
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master X.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master X is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
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For example, Audio Bus Master 0 is defined as an output
only, so bit 3 of Audio Bus Master 0 Command Register
(F3BAR+Memory Offset 20h[3]) must always be set to 1.
Table 3-62 explains the generic format for the six audio
bus masters. Table 3-63 gives the register locations, reset
values and specific programming information of bit 3,
Read or Write Control, in the Command Register for the
Audio Bus Masters.
Table 3-63. Audio Bus Master Configuration Register Summary
Bit
Description
Audio Bus Master 0: Output to Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
F3BAR+Memory Offset 20h
F3BAR+Memory Offset 21h
F3BAR+Memory Offset 22h-23h
F3BAR+Memory Offset 24h-27h
Command Register (R/W)
SMI Status Register (RC)
Not Used
PRD Table Address (R/W)
Reset Value = 00h
Reset Value = 00h
Reset Value = 00000000h
Refer to Table 3-62 for bit descriptions.
Note: Bit 3 of the Command Register must be set to 0 (read) and should not be changed when the bus master is active.
Audio Bus Master 1: Input from Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
F3BAR+Memory Offset 28h
F3BAR+Memory Offset 29h
F3BAR+Memory Offset 2Ah-2Bh
F3BAR+Memory Offset 2Ch-2Fh
Command Register (R/W)
SMI Status Register (RC)
Not Used
PRD Table Address (R/W)
Reset Value = 00h
Reset Value = 00h
Reset Value = 00000000h
Refer to Table 3-62 for bit descriptions.
Note: Bit 3 of the Command Register must be set to 1 (write) and should not be changed when the bus master is active.
Audio Bus Master 2: Output to Codec; 16-Bit; Slot 5
F3BAR+Memory Offset 30h
F3BAR+Memory Offset 31h
F3BAR+Memory Offset 32h-33h
F3BAR+Memory Offset 34h-37h
Command Register (R/W)
SMI Status Register (RC)
Not Used
PRD Table Address (R/W)
Reset Value = 00h
Reset Value = 00h
Reset Value = 00000000h
Refer to Table 3-62 for bit descriptions.
Note: Bit 3 of the Command Register must be set to 0 (read) and should not be changed when the bus master is active.
Audio Bus Master 3: Input from Codec; 16-Bit; Slot 5.
F3BAR+Memory Offset 38h
F3BAR+Memory Offset 39h
F3BAR+Memory Offset 3Ah-3Bh
F3BAR+Memory Offset 3Ch-3Fh
Command Register (R/W)
SMI Status Register (RC)
Not Used
PRD Table Address (R/W)
Reset Value = 00h
Reset Value = 00h
Reset Value = 00000000h
Refer to Table 3-62 for bit descriptions.
Note: Bit 3 of the Command Register must be set to 1 (write) and should not be changed when the bus master is active.
Audio Bus Master 4: Output to Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[19] selects slot).
F3BAR+Memory Offset 40h
F3BAR+Memory Offset 41h
F3BAR+Memory Offset 42h-43h
F3BAR+Memory Offset 44h-47h
Command Register (R/W)
SMI Status Register (RC)
Not Used
PRD Table Address (R/W)
Reset Value = 00h
Reset Value = 00h
Reset Value = 00000000h
Refer to Table 3-62 for bit descriptions.
Note: Bit 3 of the Command Register must be set to 0 (read) and should not be changed when the bus master is active.
Audio Bus Master 5: Input from Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[20] selects slot).
F3BAR+Memory Offset 48h
F3BAR+Memory Offset 49h
F3BAR+Memory Offset 4Ah-4Bh
F3BAR+Memory Offset 4Ch-4Fh
Command Register (R/W)
SMI Status Register (RC)
Not Used
PRD Table Address (R/W)
Reset Value = 00h
Reset Value = 00h
Reset Value = 00000000h
Refer to Table 3-62 for bit descriptions.
Note: Bit 3 of the Command Register must be set to 1 (write) and should not be changed when the bus master is active.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.7.1.2 Physical Region Descriptor Table Address
Before the bus master starts a master transfer it must be
programmed with a pointer (PRD Table Address Register)
to a Physical Region Descriptor Table. This pointer sets
the starting memory location of the Physical Region
Descriptors (PRDs). The PRDs describe the areas of
memory that are used in the data transfer. The descriptor
table entries must be aligned on a 4-byte boundary and
the table cannot cross a 64 KB boundary in memory.
• EOT bit - If set in a PRD, this bit indicates the last entry
in the PRD table (bit 31). The last entry in a PRD table
must have either the EOT bit or the JMP bit set. A PRD
can not have both the JMP and EOT bits set.
• EOP bit - If set in a PRD and the bus master has
completed the PRD’s transfer, the End of Page bit is
set (Status Register bit 0 = 1) and an SMI is generated.
If a second EOP is reached due to the completion of
another PRD before the End of Page bit is cleared, the
Bus Master Error bit is set (Status Register bit 1 = 1)
and the bus master pauses. In this paused condition,
reading the Status Register clears both the Bus Master
Error and the End of Page bits and the bus master
continues.
3.7.1.3 Physical Region Descriptor Format
Each physical memory region to be transferred is
described by a Physical Region Descriptor (PRD) as illustrated in Table 3-64. When the bus master is enabled
(Command Register bit 0 = 1), data transfer proceeds until
each PRD in the PRD table has been transferred. The bus
master does not cache PRDs.
• JMP bit - This PRD is special. If set, the Memory
Region Physical Base Address is now the target
address of the JMP. There is no data transfer with this
PRD. This PRD allows the creation of a looping mechanism. If a PRD table is created with the JMP bit set in
the last PRD, the PRD table does not need a PRD with
the EOT bit set. A PRD can not have both the JMP and
EOT bits set.
The PRD table consists of two DWORDs. The first
DWORD contains a 32-bit pointer to a buffer to be transferred. The second DWORD contains the size (16 bits) of
the buffer and flags (EOT, EOP, JMP). The description of
the flags are as follows:
Table 3-64. Physical Region Descriptor Format
Byte 3
Byte 2
Byte 1
Byte 0
DWORD 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
0
1
E E J
O O M
T P P
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8
7
6
5
4
3
2
1
0
Memory Region Base Address [31:1] (Audio Data Buffer)
0
Reserved
0
Size [15:1]
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to do this is by using the EOP flags to generate an
SMI when a PRD is empty.
3.7.1.4 Programming Model
The following discussion explains, in steps, how to initiate
and maintain a bus master transfer between memory and
an audio slave device.
Example - Fill Audio Buffer_1 and Audio Buffer_2.
The SMI generated by the EOP from the first PRD
allows the software to refill Audio Buffer_1. The
second SMI will refill Audio Buffer_2. The third SMI
will refill Audio Buffer_1 and so on.
In the steps listed below, the reference to “Example”
refers to Figure 3-20, PRD Table Example.
1)
Software creates a PRD table in system memory.
Each PRD entry is 8 bytes long; consisting of a base
address pointer and buffer size. The maximum data
that can be transferred from a PRD entry is 64 KB. A
PRD table must be aligned on a 4-byte boundary.
The last PRD in a PRD table must have the EOT or
JMP bit set.
4)
Set the correct direction to the Read or Write Control
bit (Command Register bit 3). Note that the direction
of the data transfer of a particular bus master is fixed
and therefore the direction bit must be programmed
accordingly. It is assumed that the codec has been
properly programmed to receive the audio data.
Example - Assume the data is outbound. There are
three PRDs in the example PRD table. The first two
PRDs (PRD_1, PRD_2) have only the EOP bit set.
The last PRD (PRD_3) has only the JMP bit set. This
example creates a PRD loop.
2)
Engage the bus master by writing a “1” to the Bus
Master Control bit (Command Register bit 0).
The bus master reads the PRD entry pointed to by
the PRD Table Address Register and increments the
address by 08h to point to the next PRD. The transfer
begins.
Software loads the starting address of the PRD table
by programming the PRD Table Address Register.
Example - Program the PRD Table Address Register
with Address_3.
3)
Read the SMI Status Register to clear the Bus
Master Error and End of Page bits (bits 1 and 0).
Example - The bus master is now properly
programmed to transfer Audio Buffer_1 to a specific
slot(s) in the AC97 interface.
Software must fill the buffers pointed to by the PRDs
with audio data. It is not absolutely necessary to fill
the buffers; however, the buffer filling process must
stay ahead of the buffer emptying. The simplest way
Address_1
Address_3
Address_1
PRD_1
EOT = 0
EOP = 1
JMP = 0
Audio
Buffer_1
Size_1
Audio
Buffer_2
Size_2
Size_1
Address_2
PRD_2
EOT = 0
EOP = 1
JMP = 0
Size_2
Address_2
Address_3
EOT = 0
EOP = 0
JMP = 1
PRD_3
Don’t Care
Figure 3-20. PRD Table Example
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
5)
The bus master transfers data to/from memory
responding to bus master requests from the AC97
interface. At the completion of each PRD, the bus
master’s next response depends on the settings of
the flags in the PRD.
The AC97 codec (e.g., LM4548) is the master of the serial
interface and generates the clocks to CS5530, Figure 321 shows the codec and CS5530 signal connections. For
specifications on the serial interface, refer to the appropriate codec manufacturer’s data sheet.
Example - At the completion of PRD_1 an SMI is
generated because the EOP bit is set while the bus
master continues on to PRD_2. The address in the
PRD Table Address Register is incremented by 08h
and is now pointing to PRD_3. The SMI Status
Register is read to clear the End of Page status flag.
Since Audio Buffer_1 is now empty, the software can
refill it.
For PC speaker synthesis, the CS5530 outputs the PC
speaker signal on the PC_BEEP pin which is connected
to the PC_BEEP input of the AC97 codec.
External Source
BITCLK
Geode™
CS5530 I/O
Companion SYNC
At the completion of PRD_2 an SMI is generated
because the EOP bit is set. The bus master then
continues on to PRD_3. The address in the PRD
Table Address Register is incremented by 08h. The
DMA SMI Status Register is read to clear the End of
Page status flag. Since Audio Buffer_2 is now empty,
the software can refill it. Audio Buffer_1 has been
refilled from the previous SMI.
PC_BEEP
SDAT_I
SDATA_IN
SDATA_OUT
Figure 3-21. AC97 Signal Connections
Codec Configuration/Control Registers
The codec related registers consist of four 32-bit registers:
Stopping the bus master can be accomplished by not
reading the SMI Status Register End of Page status
flag. This will lead to a second EOP which causes a
Bus Master Error and pauses the bus master. In
effect, once a bus master has been enabled it never
has to be disabled, just paused. The bus master
cannot be disabled unless the bus master has been
paused or has reached an EOT.
•
•
•
•
Codec GPIO Status Register
Codec GPIO Control Register
Codec Status Register
Codec Command Register
Codec GPIO Status and Control Registers (F3BAR+
Memory Offset 00h and 04h)
The Codec GPIO Status and Control Registers are used
for codec GPIO related tasks such as enabling a codec
GPIO interrupt to cause an SMI.
3.7.1.5 AC97 Codec Interface
The CS5530 provides an AC97 Specification Revision
1.3, 2.0, and 2.1 compatible interface. Any AC97 codec
which supports sample rate conversion (SRC) can be
used with the CS5530. This type of codec allows for a
design which meets the requirements for PC97 and
PC98-compliant audio as defined by Microsoft Corporation.
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AC97
24.576MHz Codec
SYNC
PC_BEEP
SDAT_O
PRD_3 has the JMP bit set. This means the bus
master uses the address stored in PRD_3
(Address_3) to locate the next PRD. It does not use
the address in the PRD Table Address Register to
get the next PRD. Since Address_3 is the location of
PRD_1, the bus master has looped the PRD table.
BIT_CLK
Codec Status Register (F3BAR+Memory Offset 08h)
The Codec Status Register stores the codec status word.
It updates every valid Status Word slot.
Codec Control Register (F3BAR+Memory Offset 0Ch)
The Codec Control Register writes the control word to the
codec. By writing the appropriate control words to this
port, the features of the codec can be controlled. The contents of this register are written to the codec during the
Control Word slot.
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Table 3-65. Codec Configuration/Control Registers
Bit
Description
F3BAR+Memory Offset 00h-03h
Codec GPIO Status Register (R/W)
31
Codec GPIO Interface: 0 = Disable; 1 = Enable.
30
Codec GPIO SMI: Allow codec GPIO interrupt to generate an SMI: 0 = Disable; 1= Enable.
Reset Value = 00000000h
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset10h/12h[1].
29:21
20
19:0
Reserved: Set to 0.
Codec GPIO Status Valid (Read Only): Is the status read valid? 0 = Yes; 1 = No.
Codec GPIO Pin Status (Read Only): This is the GPIO pin status that is received from the codec in slot 12 on
SDATA_IN signal.
F3BAR+Memory Offset 04h-07h
Codec GPIO Control Register (R/W)
Reset Value = 00000000h
31:20
Reserved: Set to 0.
19:0
Codec GPIO Pin Data: This is the GPIO pin data that is sent to the codec in slot 12 on the SDATA_OUT signal.
F3BAR+Memory Offset 08h-0Bh
31:24
23
Codec Status Register (R/W)
Reset Value = 00000000h
Codec Status Address (Read Only): Address of the register for which status is being returned. This address comes
from slot 1 bits [19:12].
Codec Serial INT SMI: Allow codec serial interrupt to generate an SMI: 0 = Disable; 1= Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset10h/12h[1].
22
SYNC Pin: Selects SYNC pin level: 0 = Low; 1 = High.
21
Enable SDATA_IN2: Pin AE24 functions as: 0 = GPIO1; 1 = SDATA_IN2.
For this pin to function as SDATA_IN2, it must first be configured as an input (F0 Index 90h[1] = 0).
20
Audio Bus Master 5 AC97 Slot Select: Selects slot for Audio Bus Master 5 to receive data:
0 = Slot 6; 1 = Slot 11.
19
Audio Bus Master 4 AC97 Slot Select: Selects slot for Audio Bus Master 4 to transmit data:
0 = Slot 6; 1 = Slot 11.
18
Reserved: Set to 0.
17
Status Tag (Read Only): Determines if the status in bits [15:0] is new or not: 0 = Not new; 1 = New.
16
Codec Status Valid (Read Only): Is the status in bits [15:0] valid? 0 = No; 1 = Yes.
15:0
Codec Status (Read Only): This is the codec status data that is received from the codec in slot 2 on SDATA_IN. Only
bits [19:4] are used from slot 2.
F3BAR+Memory Offset 0Ch-0Fh
Codec Command Register (R/W)
Reset Value = 00000000h
31:24
Codec Command Address: Address of the codec control register for which the command is being sent. This address
goes in slot 1 bits [19:12] on SDATA_OUT.
23:22
CS5530 Codec Communication: Selects which codec to communicate with:
00 = Primary codec
10 = Third codec
01 = Secondary codec
11 = Fourth codec
Note: 00 and 01 are the only valid settings for these bits.
21:17
16
Reserved: Set to 0.
Codec Command Valid: Is the command in bits [15:0] valid? 0 = No; 1 = Yes.
This bit is set by hardware when a command is loaded. It remains set until the command has been sent to the codec.
15:0
Revision 4.1
Codec Command: This is the command being sent to the codec in bits [19:12] of slot 2 on SDATA_OUT.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.7.2 VSA Technology Support Hardware
The CS5530 I/O companion incorporates the required
hardware in order to support the Virtual System Architecture (VSA) technology for capture and playback of audio
using an external codec. This eliminates much of the
hardware traditionally associated with industry standard
audio functions.
The Top SMI Status Mirror and Status Registers are the
top level of hierarchy for the SMI Handler in determining
the source of an SMI. These two registers are at
F1BAR+Memory Offset 00h (Status Mirror) and
F1BAR+Memory Offset 02h (Status). The registers are
identical except that reading the register at F1BAR+Memory Offset 02h clears the status.
XpressAUDIO software provides 16-bit compatible sound.
This software is available to OEMs for incorporation into
the system BIOS ROM.
Second Level Audio SMI Status Registers - The second level of audio SMI status reporting is set up very
much like the top level. There are two status reporting
registers, one “read only” (mirror) and one “read to clear”.
The data returned by reading either offset is the same
(i.e., SMI was caused by an audio related event). The difference between F3BAR+Memory Offset 12h (mirror) and
10h is in the ability to clear the SMI source at 10h.
3.7.2.1 VSA Technology
VSA technology provides a framework to enable software
implementation of traditionally hardware-only components. VSA technology software executes in System Management Mode (SMM), enabling it to execute
transparently to the operating system, drivers and applications.
Figure 3-22 shows an SMI tree for checking and clearing
the source of an audio SMI. Only the audio SMI bit is
detailed here. For details regarding the remaining bits in
the Top SMI Status Mirror and Status Registers refer to
Table 4-16 "F1BAR+Memory Offset xxh: SMI Status and
ACPI Timer Registers" on page 180.
The VSA technology design is based upon a simple
model for replacing hardware components with software.
Hardware to be virtualized is merely replaced with simple
access detection circuitry which asserts the SMI# (System
Management Interrupt) pin when hardware accesses are
detected. The current execution stream is immediately
preempted, and the processor enters SMM. The SMM
system software then saves the processor state, initializes the VSA technology execution environment, decodes
the SMI source and dispatches handler routines which
have registered requests to service the decoded SMI
source. Once all handler routines have completed, the
processor state is restored and normal execution
resumes. In this manner, hardware accesses are transparently replaced with the execution of SMM handler software.
I/O Trap SMI and Fast Write Status Register - This 32bit read-only register (F3BAR+Memory Offset 14h) not
only indicates if the enabled I/O trap generated an SMI,
but also contains Fast Path Write related bits.
I/O Trap SMI Enable Register - The I/O Trap SMI Enable
Register (F3BAR+Memory Offset 18h) allows traps for
specified I/O addresses and configures generation for I/O
events. It also contains the enabling bit for Fast Path
Write/Read features.
Status Fast Path Read - If enabled, the CS5530 intercepts and responds to reads to several status registers.
This speeds up operations, and prevents SMI generation
for reads to these registers. This process is called Status
Fast Path Read. Status Fast Path Read is enabled via
F3BAR+Memory Offset 18h[4].
Historically, SMM software was used primarily for the single purpose of facilitating active power management for
notebook designs. That software’s only function was to
manage the power up and down of devices to save
power. With high performance processors now available,
it is feasible to implement, primarily in SMM software, PC
capabilities traditionally provided by hardware. In contrast
to power management code, this virtualization software
generally has strict performance requirements to prevent
application performance from being significantly
impacted.
In Status Fast Path Read the CS5530 responds to reads
of the following addresses:
388h-38Bh
2x0h, 2x1, 2x2h, 2x3, 2x8 and 2x9h
Note that if neither sound card nor FM I/O mapping is
enabled, then status read trapping is not possible.
Fast Path Write - If enabled, the CS5530 captures certain writes to several I/O locations. This feature prevents
two SMIs from being asserted for write operations that are
known to take two accesses (the first access is an index
and the second is data). This process is called Fast Path
Write. Fast Path Write is enabled in via F3BAR+Memory
Offset 18h[11].
3.7.2.2 Audio SMI Related Registers
The SMI related registers consist of:
• Second Level Audio SMI Status Registers
• I/O Trap SMI and Fast Write Status Register
• I/O Trap SMI Enable Register
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Fast Path Write captures the data and address bit 1 (A1)
of the first access, but does not generate an SMI. A1 is
stored in F3BAR+Memory Offset 14h[15]. The second
access causes an SMI, and the data and address are
captured as in a normal trapped I/O.
SMI# Asserted
In Fast Path Write, the CS5530 responds to writes to the
following addresses:
388h, 38Ah and 38B
2x0h, 2x2h, and 2x8h
Table 3-66 and Table 3-67 show the bit formats of the second and third level SMI status reporting registers, respectively. Table 3-68 shows the sound card I/O trap and Fast
Path Read/Write programming bits.
SMM software reads SMI Header
If Bit X = 0
(Internal SMI)
If Bit X = 1
(External SMI)
Geode™ GXLV
Processor
Call internal SMI handler
to take appropriate action
Geode™ CS5530
I/O Companion
F1BAR+Memory
Offset 02h
Read to Clear
to determine
top-level source
of SMI
SMI Deasserted after all SMI Sources are Cleared
(i.e., Top, Second, and Third Levels)
F3BAR+Memory
Offset 10h
Read to Clear
to determine
second-level
source of SMI
Bits [15:8]
RSVD
Bit 7
ABM5_SMI
Bits [15:2]
Other_SMI
F3BAR+Memory
Offset 14h
Read to Clear
to determine
third-level
source of SMI
Bit 6
ABM4_SMI
Bit 5
ABM3_SMI
Bit 1
AUDIO_SMI
Bit 0
Other_SMI
Top Level
If bit 1 = 1,
Source of
SMI is
Audio Event
Take
Appropriate
Action
Bit 4
ABM2_SMI
Bit 3
ABM1_SMI
Bits [31:14]
Other_RO
Bit 13
SMI_SC/FM_TRAP
Bit 2
ABM0_SMI
Bit 1
SER_INTR_SMI
Bit 0
I/O_TRAP_SMI
Bit 12
SMI_DMA_TRAP
If bit 0 = 1,
Source of
SMI is
I/O Trap
Bit 11
SMI_MPU_TRAP
Take
Appropriate
Action
Bit 10
SMI_SC/FM_TRAP
Second Level
Bit [9:0]
Other_RO
Third Level
Figure 3-22. Audio SMI Tree Example
Revision 4.1
121
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-66. Second Level SMI Status Reporting Registers
Bit
Description
F3BAR+Memory Offset 10h-11h
15:8
7
Second Level Audio SMI Status Mirror Register (RC)
Reset Value = 0000h
Reserved: Set to 0.
Audio Bus Master 5 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 5?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 5 is enabled (F3BAR+Memory Offset 48h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 49h[0] = 1).
6
Audio Bus Master 4 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 4?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 4 is enabled (F3BAR+Memory Offset 40h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 41h[0] = 1).
5
Audio Bus Master 3 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 3?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 3 is enabled (F3BAR+Memory Offset 38h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 39h[0] = 1).
4
Audio Bus Master 2 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 2?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 2 is enabled (F3BAR+Memory Offset 30h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 31h[0] = 1).
3
Audio Bus Master 1 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 1?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 1 is enabled (F3BAR+Memory Offset 28h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 29h[0] = 1).
2
Audio Bus Master 0 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 0?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 0 is enabled (F3BAR+Memory Offset 20h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 21h[0] = 1).
1
Codec Serial or GPIO Interrupt SMI Status (Read to Clear): SMI was caused by a serial or GPIO interrupt from codec?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling for codec serial interrupt: F3BAR+Memory Offset 08h[23] = 1.
SMI generation enabling for codec GPIO interrupt: F3BAR+Memory Offset 00h[30] = 1.
0
I/O Trap SMI Status (Read to Clear): SMI was caused by an I/O trap? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The next level (third level) of SMI status reporting is at F3BAR+Memory
Offset 14h. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
Note: Reading this register clears the status bits. Note that bit 0 has another level (third) of SMI status reporting.
A read-only “Mirror” version of this register exists at F3BAR+Memory Offset 00h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), the Mirror register may be read instead.
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Table 3-66. Second Level SMI Status Reporting Registers (Continued)
Bit
Description
F3BAR+Memory Offset 12h-13h
15:8
7
Second Level Audio SMI Status Register (RO)
Reset Value = 0000h
Reserved: Set to 0.
Audio Bus Master 5 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 5?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 5 is enabled (F3BAR+Memory Offset 48h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 49h[0] = 1).
6
Audio Bus Master 4 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 4?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 4 is enabled (F3BAR+Memory Offset 40h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 41h[0] = 1).
5
Audio Bus Master 3 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 3?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 3 is enabled (F3BAR+Memory Offset 38h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 39h[0] = 1).
4
Audio Bus Master 2 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 2?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 2 is enabled (F3BAR+Memory Offset 30h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 31h[0] = 1).
3
Audio Bus Master 1 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 1?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 1 is enabled (F3BAR+Memory Offset 28h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 29h[0] = 1).
2
Audio Bus Master 0 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 0?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 0 is enabled (F3BAR+Memory Offset 20h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 21h[0] = 1).
1
Codec Serial or GPIO Interrupt SMI Status (Read Only): SMI was caused by a serial or GPIO interrupt from codec?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling for codec serial interrupt: F3BAR+Memory Offset 08h[23] = 1.
SMI generation enabling for codec GPIO interrupt: F3BAR+Memory Offset 00h[30] = 1.
0
I/O Trap SMI Status (Read Only): SMI was caused by an I/O trap? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The next level (third level) of SMI status reporting is at F3BAR+Memory
Offset 14h. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
Note: Reading this register does not clear the status bits. See F3BAR+Memory Offset 10h.
Revision 4.1
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-67. Third Level SMI Status Reporting Registers
Bit
Description
F3BAR+Memory Offset 14h-17h
I/O Trap SMI and Fast Write Status Register (RO/RC)
Reset Value = 00000000h
31:24
Fast Path Write Even Access Data (Read Only): These bits contain the data from the last Fast Path Write Even
access. These bits change only on a fast write to an even address.
23:16
Fast Path Write Odd Access Data (Read Only): These bits contain the data from the last Fast Path Write Odd access.
These bits change on a fast write to an odd address, and also on any non-fast write.
15
Fast Write A1 (Read Only): This bit contains the A1 value for the last Fast Write access.
14
Read or Write I/O Access (Read Only): Last trapped I/O access was a read or a write? 0 = Read; 1 = Write.
13
Sound Card or FM Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the Sound Card or
FM I/O Trap? 0 = No; 1 = Yes. (Note)
Fast Path Write must be enabled, F3BAR+Memory Offset 18h[11] = 1, for the SMI to be reported here. If Fast Path Write
is disabled, the SMI is reported in bit 10 of this register.
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[2].
12
DMA Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the DMA I/O Trap?
0 = No; 1 = Yes. (Note)
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[8:7].
11
MPU Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the MPU I/O Trap?
0 = No; 1 = Yes. (Note)
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[6:5].
10
Sound Card or FM Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the Sound Card or
FM I/O Trap? 0 = No; 1 = Yes. (Note)
Fast Path Write must be disabled, F3BAR+Memory Offset 18h[11] = 0, for the SMI to be reported here. If Fast Path Write
is enabled, the SMI is reported in bit 13 of this register.
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[2].
9:0
X-Bus Address (Read Only): Bits [9:0] contain the captured ten bits of X-Bus address.
Note: For the four SMI status bits (bits [13:10]), if the activity was a fast write to an even address, no SMI is generated regardless of
the DMA, MPU, or sound status. If the activity was a fast write to an odd address, an SMI is generated but bit 13 is set to 1.
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Table 3-68. Sound Card I/O Trap and Fast Path Enable Registers
Bit
Description
F3BAR+Memory Offset 18h-19h
15:12
11
I/O Trap SMI Enable Register (R/W)
Reset Value = 0000h
Reserved: Set to 0.
Fast Path Write Enable: Fast Path Write (an SMI is not generated on certain writes to specified addresses):
0 = Disable; 1 = Enable.
In Fast Path Write, the CS5530 responds to writes to the following addresses: 388h, 38Ah and 38B;
2x0h, 2x2h, and 2x8h.
10:9
8
Fast Read: These two bits hold part of the response that the CS5530 returns for reads to several I/O locations.
High DMA I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port C0h-DFh, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[12].
7
Low DMA I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 00h-0Fh, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[12].
6
High MPU I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 330h and 331h, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[11].
5
Low MPU I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 300h and 301h, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[11].
4
Fast Path Read Enable/SMI Disable: Read Fast Path (an SMI is not generated on reads from specified addresses):
0 = Disable; 1 = Enable.
In Fast Path Read the CS5530 responds to reads of the following addresses: 388h-38Bh; 2x0h, 2x1, 2x2h, 2x3, 2x8 and
2x9h.
Note that if neither sound card nor FM I/O mapping is enabled, then status read trapping is not possible.
3
FM I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 388h to 38Bh, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
2
Sound Card I/O Trap: 0 = Disable; 1 = Enable
If this bit is enabled and an access occurs in the address ranges selected in by bits [1:0], an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[10].
1:0
Sound Card Address Range Select: These bits select the address range for the sound card I/O trap.
00 = I/O Port 220h-22Fh
01 = I/O Port 240h-24Fh
Revision 4.1
10 = I/O Port 260h-26Fh
11 = I/O Port 280h-28Fh
125
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.7.2.3 IRQ Configuration Registers
The CS5530 provides the ability to set and clear IRQs
internally through software control. If the IRQs are configured for software control, they will not respond to external
hardware. There are three registers provided for this feature:
(hardware) interrupts. Any IRQ used as an internal software driven source must be configured as internal.
Internal IRQ Mask Register - Each bit in the Mask register individually disables the corresponding bit in the Control Register.
Internal IRQ Control Register - This register allows individual software assertion/deassertion of the IRQs that are
enabled as internal and unmasked.
• Internal IRQ Enable Register
• Internal IRQ Mask Register
• Internal IRQ Control Register
The bit formats for these registers are given in Table 3-69.
Internal IRQ Enable Register - This register configures
the IRQs as internal (software) interrupts or external
Table 3-69. IRQ Configuration Registers
Bit
Description
F3BAR+Memory Offset 1Ah-1Bh
Internal IRQ Enable Register (R/W)
Reset Value = 0000h
Note: Must be R/W as a WORD.
15
IRQ15 Internal: Configure IRQ15 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
14
IRQ14 Internal: Configure IRQ14 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
13
Reserved: Set to 0.
12
IRQ12 Internal: Configure IRQ12 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
11
IRQ11 Internal: Configure IRQ11 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
10
IRQ10 Internal: Configure IRQ10 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
9
IRQ9 Internal: Configure IRQ9 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
8
Reserved: Set to 0.
7
IRQ7 Internal: Configure IRQ7 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
6
Reserved: Set to 0.
5
IRQ5 Internal: Configure IRQ5 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
4
IRQ4 Internal: Configure IRQ4 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
3
IRQ3 Internal: Configure IRQ3 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
2:0
Reserved: Set to 0.
Note: This register must be read and written as a WORD.
F3BAR+Memory Offset 1Ch-1Dh
Internal IRQ Control Register (R/W)
15
Assert Masked Internal IRQ15: 0 = Disable; 1 = Enable.
14
Assert Masked Internal IRQ14: 0 = Disable; 1 = Enable.
13
Reserved: Set to 0.
12
Assert Masked Internal IRQ12: 0 = Disable; 1 = Enable.
11
Assert masked internal IRQ11: 0 = Disable; 1 = Enable.
10
Assert Masked Internal IRQ10: 0 = Disable; 1 = Enable.
9
Assert Masked Internal IRQ9: 0 = Disable; 1 = Enable.
8
Reserved: Set to 0.
7
Assert Masked Internal IRQ7: 0 = Disable; 1 = Enable.
6
Reserved: Set to 0.
5
Assert Masked Internal IRQ5: 0 = Disable; 1 = Enable.
4
Assert Masked Internal IRQ4: 0 = Disable; 1 = Enable.
3
Assert Masked Internal IRQ3: 0 = Disable; 1 = Enable.
2:0
Reset Value = 00000000h
Reserved: Set to 0.
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Table 3-69. IRQ Configuration Registers (Continued)
Bit
Description
F3BAR+Memory Offset 1Eh-1Fh
15
Internal IRQ Mask Register (Write Only)
14
Mask Internal IRQ14: 0 = Disable; 1 = Enable.
13
Reserved: Set to 0.
12
Mask Internal IRQ12: 0 = Disable; 1 = Enable.
11
Mask Internal IRQ11: 0 = Disable; 1 = Enable.
10
Mask Internal IRQ10: 0 = Disable; 1 = Enable.
9
Mask Internal IRQ9: 0 = Disable; 1 = Enable.
8
Reserved: Set to 0.
7
Mask Internal IRQ7: 0 = Disable; 1 = Enable.
6
Reserved: Set to 0.
5
Mask Internal IRQ5: 0 = Disable; 1 = Enable.
4
Mask Internal IRQ4: 0 = Disable; 1 = Enable.
3
Mask Internal IRQ3: 0 = Disable; 1 = Enable.
2:0
Revision 4.1
Reset Value = 00000000h
Mask Internal IRQ15: 0 = Disable; 1 = Enable.
Reserved: Set to 0.
127
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.8
DISPLAY SUBSYSTEM EXTENSIONS
The CS5530 incorporates extensions to the GXLV processor’s display subsystem. These include:
Figure 3-23 shows the data path of the display subsystem
extensions.
• Video Accelerator
- Buffers and formats input YUV video data from
GXLV processor
- Supports 8-bit interface to GXLV processor
- X & Y scaler with bilinear filter
- Color space converter (YUV to RGB)
3.8.1 Video Interface Configuration Registers
Registers for configuring the video interface are accessed
through F4 Index 10h, the Base Address Register
(F4BAR) in Function 4. F4BAR sets the base address for
the Video Interface Configuration Registers as shown in
Table 3-70.
• Video Overlay Logic
- Color key
- Data switch for graphics and video data
Note:
All Video Interface Configuration Registers have a
32-bit access granularity (only).
The following subsections describe the video interface
and the registers used for programming purposes. However, for complete bit information refer to Section 4.3.5
“Video Controller Registers - Function 4” on page 199.
• Gamma RAM
- Brightness and contrast control
• Display Interface
- Integrated RGB video DACs
- VESA DDC2B/DPMS support
- Flat Panel interface
Table 3-70. Base Address Register (F4BAR) for Video Controller Support Registers
Bit
Description
F4 Index 10h-13h
Base Address Register — F4BAR (R/W)
Reset Value = 00000000h
This register sets the base address of the memory mapped video controller registers. Bits [11:0] are read only (0000 0000 0000), indicating a 4 KB memory address range. Refer to Table 4-22 for the video controller register bit formats and reset values.
31:12
Video Controller and Clock Control Base I/O Address
11:0
Address Range (Read Only)
Input
Formatter
Buffer 0
24
Formatter
/
Scaler
Buffer 1
VID_DATA[7:0]
Vertical
Filter
Color
Space
Converter
Horizontal
Filter
8
Buffer 2
(3x360x32 bit)
Video
24
Color Key
Register
24
24
PIXEL[23:0]
Enable Gamma
Correction Register
24
Color
Compare
Bypass
24
24
Gamma
RAM
24
Dither
18
FP_DATA
8 each
DAC
RGB to CRT
Figure 3-23. 8-Bit Display Subsystem Extensions
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3.8.2 Video Accelerator
The CS5530 off-loads the processor from several computing-intensive tasks related to the playback of full motion
video. By incorporating this level of hardware-assist, a
CS5530/GXLV processor based system can sustain 30
frames-per-second of MPEG quality video.
width allows the processor and graphics accelerator an
increased opportunity to access the memory subsystem
and improves overall system performance during video
playback.
3.8.2.2 Video Port Protocol
The video port operates at one-half the processor’s core
clock rate and utilizes a two-wire handshake protocol. The
VID_VAL input signal indicates that valid data has been
placed on the VID_DATA[7:0] bus. When the CS5530 is
ready to accept data, it asserts VID_RDY to indicate that a
line buffer is free to accept the next line. When both
VID_VAL and VID_RDY are asserted, VID_DATA
advances.
3.8.2.1 Line Buffers
The CS5530 accepts an 8-bit video stream from the processor and provides three full MPEG resolution line buffers (3x360x32-bit). MPEG source horizontal resolutions
up to 720 pixels are supported. By having three line buffers, the display pipeline can read from two lines while the
next line of data is being loaded from the processor. This
minimizes memory bandwidth utilization by requiring that
a source line be transferred only once per frame. Peak
bandwidth is also reduced by requiring that the video
source line be transferred within the horizontal line time
rather than forcing the transfer to occur during the active
video window. This efficient utilization of memory band-
The VID_RDY signal is driven by the CS5530 one clock
early to the processor while the VID_VAL signal is driven
by the processor coincident with valid data on VID_DATA.
A sample timing diagram is shown in Figure 3-24.
VID_CLK
VID_VAL
8 + 2CLKs
8 CLKs
2 CLKs
VID_RDY
VID_DATA[7:0]
3 CLKs
8 CLKs
Note: VID_CLK = CORE_CLK/2
Figure 3-24. Video Port Protocol
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.8.2.3 Video Format
The video input data can be in interleaved YUV 4:2:2 or
RGB 5:6:5 format. The sequence of the individual YUV
components is selectable to one of four formats via bits
[3:2] in the Video Configuration Register (F4BAR+Memory Offset 00h[3:2]). The decode for these bits is shown in
Table 3-71.
Table 3-71. Video Input Format Bits
Bit
Description
F4BAR+Memory Offset 00h-03h
Video Configuration Register (R/W)
Reset Value = 00000000h
31
Reserved: Set to 0
30
High Speed Timing for Video Interface: High speed timings for the video interface: 0 = Disable; 1= Enable.
If bit 30 is enabled, bit 25 should be set to 0.
29
16-bit Video Interface: Allow video interface to be 16 bits: 0 = Disable; 1= Enable.
If bit 29 is enabled, 8 bits of pixel data is used for video. The 24-bit pixel data is then dithered to 16 bits.
Note: F4BAR+Memory Offset 04h[25] should be set to the same value as this bit (bit 29).
28
YUV 4:2:2 or 4:2:0 Mode: 0 = 4:2:2 Mode; 1= 4:2:0 Mode.
If 4:2:0 mode is selected, bits [3:2] should be set to 01 if in 8-bit video mode and 10 if in 16-bit video mode.
Note: The GXLV processor does not support 4:2:0 mode.
27
Video Line Size (DWORDs): This is the MSB of the Video Line Size (DWORDs). See bits [15:8] for description.
26
Reserved: Set to 0
25
Early Video Ready: Generate VID_RDY output signal one-half VID_CLK period early to improve the speed of the video
port operation: 0 = Disable; 1 = Enable.
Bit 25 should be set to 0 if bit 30 is enabled.
24
Initial Buffer Read Address: This is the MSB of the Initial Buffer Read Address. See bits [23:16] for description.
23:16
Initial Buffer Read Address: This field is used to preload the starting read address for the line buffers at the beginning of
each display line. It is used for hardware clipping of the video window at the left edge of the active display. It represents
the DWORD address of the source pixel which is to be displayed first. For an unclipped window, this value should be 0.
15:8
Video Line Size (DWORDs): This field represents the horizontal size of the source video data in DWORDs.
7
Y Filter Enable: Vertical filter: 0 = Disable; 1= Enable.
6
X Filter Enable: Horizontal filter: 0 = Disable; 1 = Enable.
5
CSC Bypass: Allow color-space-converter to be bypassed. Primarily used for displaying an RGB graphics overlay rather
than a YUV video overlay. 0 = Overlay data passes through CSC; 1 = Overlay data bypasses CSC.
4
GV Select: Selects whether graphics or video data will be passed through the scaler hardware:
0 = Video data; 1 = Graphics data.
3:2
Video Input Format: This field defines the byte ordering of the video data on the VID_DATA bus.
8-Bit Mode (Value Byte Order [0:3])
16-Bit Mode (Value Byte Order [0:3])
00 = U Y0 V Y1 (also used for RGB 5:6:5 input)
01 = Y1 V Y0 U or 4:2:0
10 = Y0 U Y1 V
11 = Y0 V Y1 U
00 = U Y0 V Y1 (also used for RGB 5:6:5 input)
01 = Y0 U Y1 V
10 = Y1 V Y0 U or 4:2:0
11 = Reserved
If bit 28 is enabled, bits [3:2] should be set to 01 if in 8-bit video mode and 10 if in 16-bit video mode.
Note: U = Cb, V = Cr
1
Video Register Update: Allow video position and scale registers to be updated simultaneously on next occurrence of
vertical sync: 0 = Disable; 1 = Enable.
0
Video Enable: Video acceleration hardware: 0 = Disable; 1 = Enable.
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3.8.2.4 X and Y Scaler / Filter
The CS5530 supports horizontal and vertical scaling of
the video stream up to eight times the source resolution.
The scaler uses a Digital-Differential-Analyzer (DDA)
based upon the values programmed in the Video Scale
Register (F4BAR+Memory Offset 10h, see Table 3-72)
the native source resolution. This saves both processor
overhead and memory bandwidth.
3.8.2.5 Color-Space-Converter
After scaling and filtering have been applied, the YUV
video data is passed through the color-space converter to
obtain 24-bit RGB video data. The color-space conversion
equations are based on the CCIR Recommendation 6011 as follows:
The scaled video stream is then passed through horizontal and vertical filters which perform a 2-tap, 8-phase bilinear filter on the resulting stream. The filtering function
removes the "blockiness" of the scaled video thereby significantly improving the quality of the displayed image.
R = 1.164(Y–16) + 1.596(V–128)
G = 1.164(Y–16) – 0.813(V–128) – 0.391(U–128)
B = 1.164(Y–16) + 2.018(U–128)
By performing the scaling and filtering function in hardware, video performance is substantially improved over
pure software implementations by requiring that the
decompression software only output the video stream at
The color-space converter clamps inputs to acceptable
limits if the data is not well behaved. The color-space converter is bypassed for overlaying 16 bpp RGB graphics
data.
Table 3-72. Video Scale Register
Bit
Description
F4BAR+Memory Offset 10h-13h
Video Scale Register (R/W)
Reset Value = xxxxxxxxh
31:30
Reserved: Set to 0.
29:16
Video Y Scale Factor: This field represents the video window vertical scale factor according to the following
formula:
VID_Y_SCL = 8192 * (Ys - 1) / (Yd - 1)
Where:
Ys = Video Source vertical size in lines
Yd = Video Destination vertical size in lines
15:14
Reserved: Set to 0.
13:0
Video X Scale Factor: This field represents the video window horizontal scale factor according to the following
formula:
VID_X_SCL = 8192 * (Xs - 1) / (Xd - 1)
Where:
Xs = Video Source horizontal size in pixels
Xd = Video Destination horizontal size in pixels
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
3.8.3 Video Overlay
The video data from the color-space converter is then
mixed with the graphics data based upon the video window position. The video window position is programmable
via the Video X and Y Position Registers (F4BAR+Memory Offset 08h and 0Ch). A color-keying mechanism is
employed to compare either the source (video) or destination (graphics) color to the color key programmed via the
Video Color Key Register (FBAR+Offset 14h) and to
select the appropriate pixel for display within the video
window. The range of the color key is programmable by
setting the appropriate bits in the Video Color Mask Register (F4BAR+Memory Offset 18h). This mechanism
greatly reduces the software overhead for computing visible pixels, and ensures that the video display window may
be partially occluded by overlapping graphics data.
Tables 3-73 and 3-74 show the bit formats for these registers
The CS5530 accepts graphics data over the PIXEL[23:0]
interface from the GXLV processor at the screen DOT
clock rate. The CS5530 is capable of displaying graphics
resolutions up to 1600x1200 at color depths up to 24 bits
per pixel (bpp) while simultaneously overlaying a video
window.
Table 3-73. Video X and Y Position Registers
Bit
Description
F4BAR+Memory Offset 08h-0Bh
Video X Register (R/W)
Reset Value = xxxxxxxxh
31:27
Reserved: Set to 0.
26:16
Video X End Position: This field represents the horizontal end position of the video window according to the following
formula: Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13.
15:11
Reserved: Set to 0.
10:0
Video X Start Position: This field represents the horizontal start position of the video window according to the following
formula: Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13.
F4BAR+Memory Offset 0Ch-0Fh
Video Y Register (R/W)
Reset Value = xxxxxxxxh
31:27
Reserved: Set to 0.
26:16
Video Y End Position: This field represents the vertical end position of the video window according to the following formula: Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1.
15:11
Reserved: Set to 0.
10:0
Video Y Start Position: This field represents the vertical start position of the video window according to the following formula: Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1.
Table 3-74. Video Color Registers
Bit
Description
F4BAR+Memory Offset 14h-17h
Video Color Key Register (R/W)
Reset Value = xxxxxxxxh
31:24
Reserved: Set to 0.
23:0
Video Color Key: This field represents the video color key. It is a 24-bit RGB value. The graphics or video data being
compared may be masked prior to the compare by programming the Video Color Mask register appropriately.
F4BAR+Memory Offset 18h-1Bh
Video Color Mask Register (R/W)
Reset Value = xxxxxxxxh
31:24
Reserved: Set to 0.
23:0
Video Color Mask: This field represents the video color mask. It is a 24-bit RGB value. Zeroes in the mask cause the
corresponding bits in the graphics or video stream being compared to be ignored.
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RAM). The two streams are merged based on the results
of the color key compare.
3.8.4 Gamma RAM
Either the graphics or video stream may be routed
through an on-chip gamma RAM (3x256x8-bit) which can
be used for gamma-correction of either data stream, or
contrast/brightness adjustments in the case of video data.
Configuration for this feature and the display interface are
through the Video Configuration Register (F4BAR+Memory Offset 04h). Table 3-75 shows the bit formats for this
register.
A bypass path is provided for either the graphics or video
stream (depending on which is sent through the gamma
Table 3-75. Display Configuration Register
Bit
Description
F4BAR+Memory Offset 04h-07h
Display Configuration Register (R/W)
31
DDC Input Data (Read Only): This is the DDC input data bit for reads.
30
Red Comparator (Read Only): This is the value of the red video DAC comparator.
29
Green Comparator (Read Only): This is the value of the green video DAC comparator.
Reset Value = 00h
28
Blue Comparator (Read Only): This is the value of the blue video DAC comparator.
27
Flat Panel On (Read Only): This bit indicates whether the attached flat panel display is powered on or off. The bit transitions at the end of the power-up or power-down sequence. 0 = Off; 1 = On.
26
DAC External Voltage Reference Enable: This bit enables the use of an external voltage reference for the video DAC.
When enabled, an external voltage reference should be connected to the EXTVREFIN pin. When disabled, the DAC internal voltage reference will be used. 0 = Disable; 1 = Enable.
25
16-Bit Graphics Enable: This bit works in conjunction with the 16-bit Video Interface bit at F4BAR+Memory Offset
00h[29]. This bit should be set to the same value as the 16-bit Video Interface bit.
24
DDC Output Enable: This bit enables the DDC_SDA line to be driven for write data.
0 = DDC_SDA pin is input; 1 = DDC_SDA pin is output.
23
DDC Output Data: This is the DDC data bit.
22
DDC Clock: This is the DDC clock bit. It is used to clock the DDC_SDA bit.
21
Palette Bypass: Selects whether graphics or video data should bypass the Gamma RAM:
0 = Video data; 1 = Graphics data.
20
Video/Graphics Color Key Select: Selects whether the video or graphics data stream will be used for color/chroma keying. 0 = Graphics data is compared to color key; 1 = Video data is compared to color key.
19:17
Power Sequence Delay: This field selects the number of frame periods that will transpire between successive transitions
of the power sequence control lines. Valid values are 001h to 111h.
16:14
CRT Sync Skew: This 3-bit field represents the number of pixel clocks to skew the horizontal and vertical syncs that are
sent to the CRT. This field should be programmed to 100 as the baseline. The syncs may be moved forward or backward
relative to the pixel data via this register. It is used to compensate for the pipeline delay through the graphics pipeline.
13
Flat Panel Dither Enable: This bit will enable the flat panel dithering. It enables 24 bpp display data to be approximated
with an 18-bit flat panel display. 0 = Disable; 1 = Enable.
12
XGA Flat Panel: This bit enables the FP_CLK_ EVEN output signal which can be used to demultiplex the FP_DATA bus
into even and odd pixels. 0 = Standard flat panel; 1 = XGA flat panel.
11
Flat Panel Vertical Synchronization Polarity: Selects the flat panel vertical sync polarity:
0 = FP vertical sync is normally low, transitioning high during sync interval.
1 = FP vertical sync is normally high, transitioning low during sync interval.
10
Flat Panel Horizontal Synchronization Polarity: Selects the flat panel horizontal sync polarity:
0 = FP horizontal sync is normally low, transitioning high during sync interval.
1 = FP horizontal sync is normally high, transitioning low during sync interval.
9
CRT Vertical Synchronization Polarity: Selects the CRT vertical sync polarity:
0 = CRT vertical sync is normally low, transitioning high during sync interval.
1 = CRT vertical sync is normally high, transitioning low during sync interval.
8
CRT Horizontal Synchronization Polarity: Selects the CRT horizontal sync polarity:
0 = CRT horizontal sync is normally low, transitioning high during sync interval.
1 = CRT horizontal sync is normally high, transitioning low during sync interval.
7
Flat Panel Data Enable: Enables the flat panel data bus:
0 = FP_DATA [17:0] is forced low;
1 = FP_DATA [17:0] is driven based upon power sequence control.
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-75. Display Configuration Register (Continued)
Bit
Description
6
Flat Panel Power Enable: The transition of this bit initiates a flat panel power-up or power-down sequence:
0 -> 1 = Power-up flat panel;
1 -> 0 = Power-down flat panel.
5
DAC Power-down (active low): This bit must be set to power-up the video DACs. It can be cleared to power-down the
video DACs when not in use. 0 = DACs are powered down; 1 = DACs are powered up.
4
Reserved: Set to 0.
3
DAC Blank Enable: This bit enables the blank to the video DACs.
0 = DACs are constantly blanked; 1 = DACs are blanked normally.
2
CRT Vertical Sync Enable: Enables the CRT vertical sync. Used for VESA DPMS support. 0 = Disable; 1 = Enable.
1
CRT Horizontal Sync Enable: Enables the CRT horizontal sync. Used for VESA DPMS support.
0 = Disable; 1 = Enable.
0
Display Enable: Enables the graphics display pipeline. It is used as a reset for the display control logic.
0 = Reset display control logic; 1 = Enable display control logic
3.8.5 Display Interface
The CS5530 interfaces directly to a variety of display
devices including conventional analog CRT displays, TFT
flat panels, the National Semiconductor CS9210 DSTN
Controller, or optionally to digital NTSC/PAL encoder
devices.
3.8.5.3 Flat Panel Support
The CS5530 also interfaces directly to industry standard
18-bit Active Matrix Thin-Film-Transistor (TFT) flat panels.
The CS5530 includes 24-bit to 18-bit dithering logic to
increase the apparent number of colors displayed on 18bit flat panels.
3.8.5.1 Video DACs
The CS5530 incorporates triple 8-bit video Digital-to-Analog Converters (DACs) for interfacing directly to CRT displays. The video DACs are capable of operation up to 170
MHz for supporting up to 1600x1200 display at a 75 Hz
refresh rate.
In addition, the CS5530 incorporates power sequencing
logic to simplify the design of a portable system.
The flat panel port of the CS5530 may optionally drive the
CS9210 DSTN Controller device for color dual-scan display (DSTN) support. If flat panel support is not required,
the flat panel output port may be used to supply digital
video data to one of several types of NTSC/PAL encoder
devices on the market.
3.8.5.2 VESA DDC2B / DPMS
The CS5530 supports the VESA DDC2B and DPMS standards for enhanced monitor communications and power
management support.
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3.9
UNIVERSAL SERIAL BUS SUPPORT
The CS5530 integrates a Universal Serial Bus (USB) controller which supports two ports. The USB controller is
OpenHCI compliant, a standard developed by Compaq,
Microsoft, and National Semiconductor.
Table 3-76. USB PCI Header Registers
PCIUSB
The USB core consists of three main interface blocks: the
USB PCI interface controller, the USB host controller, and
the USB interface controller. Legacy keyboard and mouse
controllers are also supported for DOS compatibility with
those USB devices.
This document must be used along with the following public domain reference documents for a complete functional
description of the USB controller:
• USB Specification Revision 1.0
• OpenHCI Specification, Revision 1.0
• PCI Specification, Version 2.1
3.9.1 USB PCI Controller
The PCI controller interfaces the host controller to the PCI
bus. As a master, the PCI controller is responsible for running cycles on the PCI bus on behalf of the host controller.
As a target, the PCI controller monitors the cycles on the
PCI bus and determines when to respond to these cycles.
The USB core is a PCI target when it decodes cycles to its
internal PCI configuration registers or to its internal PCI
memory mapped I/O registers.
The USB core is implemented as a unique PCI device in
the CS5530. It has its own PCI Header and Configuration
space and is mapped through PCI Configuration Mechanism #1 as: Bus #0, Device #0 (AD28 = 1 or AD26 = 1),
Function #0 (referred to as PCIUSB). The USB core can
be enabled/disabled through F0 Index 43h[0].
Name
Access
00h-01h
Vendor ID
RO
02h-03h
Device ID
RO
04h-05h
Command
R/W
06h-07h
Status
R/W
08h
Revision ID
RO
09h-0Bh
Class Code
RO
0Ch
Cache Line Size Register
R/W
0Dh
Latency Timer Register
R/W
0Eh
Header Type
RO
0Fh
BIST Register
RO
10h-13h
Base Address Register 0
R/W
14h-3Bh
Reserved
--
3Ch
Interrupt Line
R/W
3Dh
Interrupt Pin
R/W
3Eh
Minimum Grant
R/W
3Fh
Maximum Latency
R/W
40h-43h
Test Mode Enable
R/W
44h
Operational Mode Enable
R/W
45h-FFh
Reserved
--
All registers can be accessed via 8-, 16-, or 32-bit cycles
(i.e., each byte is individually selected by the byte
enables.) Registers marked as reserved, and reserved
bits within a register are not implemented and should
return 0s when read. Writes have no effect for reserved
registers. These registers are summarized in Table 3-76.
For complete bit information, see Section 4.4 “USB Controller Registers - PCIUSB” on page 206.
Revision 4.1
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Geode™ CS5530
Functional Description (Continued)
Geode™ CS5530
Functional Description (Continued)
Table 3-77. USB Host Controller Registers
3.9.2 USB Host Controller
In the USB core is the operational control block. It is
responsible for the host controllers operational states
(Suspend, Disable, Enable), special USB signals (Reset,
Resume), status, interrupt control, and host controller
configuration.
Offset
Name
00h-03h
HcRevision
04h-07h
HcControl
The host controller interface registers are PCI memory
mapped I/O. They are summarized in Table 3-77.
08h-0Bh
HcCommandStatus
0Ch-0Fh
HcInterruptStatus
3.9.3 USB Power Management
At this time, USB supports minimal system level power
management features. The only power management feature implemented is the disabling of the USB clock generator in USB Suspend state. Additional power
management features will require slight modifications.
10h-13h
HcInterruptEnable
14h-17h
HcInterruptDisable
18h-1Bh
HcHCCA
1Ch-1Fh
HcPeriodCurrentED
20h-23h
HcControlHeadED
The design supports PCICLK frequencies from 0 to 33
MHz. Synchronization between the PCI and USB clock
domains is frequency independent.
24h-27h
HcControlCurrentED
28h-2Bh
HcBulkHeadED
Remote wakeup of USB is asynchronously implemented
from the USB Ports to PCI INTA#.
2Ch-2Fh
HcBulkCurrentED
30h-33h
HcDoneHead
The design needs USBCLK to be operational at all times.
If it is necessary to stop the 48 MHz clock, the system
design requires that the signal used to enable/disable the
USB clock generators is also used to wake the 48 MHz
clock source. Currently, the RemoteWakeupConnected
and RemoteWakeupEnable bits in the HcControl register
are not implemented.
34h-37h
HcFmInterval
38h-3Bh
HcFrameRemaining
3Ch-3Fh
HcFmNumber
40h-43h
HcPeriodicStart
44h-47h
HcLSThreshold
48h-4Bh
HcRhDescriptorA
4Ch-4Fh
HcRhDescriptorB
50h-53h
HcRhStatus
54h-57h
HcRhPortStatus[1]
58h-5Ch
HcRhPortStatus[2]
100h-103h
HceControl
104h-107h
HceInput
108h-10Bh
HceOutput
10C-10Fh
HceStatus
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136
Revision 4.1
Register Descriptions
The Geode CS5530 is a multi-function device. Its register
space can be broadly divided into four categories in which
specific types of registers are located:
The USB Controller Register Space consists of the
standard PCI header registers. The USB controller supports two ports and is OpenHCI- compliant.
1)
2)
3)
4)
The ISA Legacy I/O Register Space contains all the legacy compatibility I/O ports that are internal, trapped, shadowed, or snooped.
Chipset Register Space (F0-F4)
USB Controller Register Space (PCIUSB)
ISA Legacy I/O Register Space (I/O Port)
V-ACPI I/O Register Space (I/O Port)
The V-ACPI I/O Register Space contains two types of
registers: Fixed Feature and General Purpose. These registers are emulated by the SMI handling code rather than
existing in physical hardware. To the ACPI-compliant
operating system, the SMI-base virtualization is transparent. An ACPI compliant system is one whose underlying
BIOS, device drivers, chipset and peripherals conform to
revision 1.0 or newer of the Advanced Control and Power
Interface specification.
The Chipset and the USB Controller Register Spaces are
accessed through the PCI interface using the PCI Type
One Configuration Mechanism.
The Chipset Register Space of the CS5530 is comprised
of five separate functions (F0-F4). Each with its own register space consisting of PCI header registers and memory
or I/O mapped registers.
F0: Bridge Configuration Registers
F1: SMI Status and ACPI Timer Registers
F2: IDE Controller Registers
F3: XpressAUDIO Subsystem Registers
F4: Video Controller Registers
The CS5530 V-ACPI (Virtual ACPI) solution provides the
following support:
• CPU States — C1, C2
• Sleep States — S1, S2, S4, S4BIOS, S5
• Embedded Controller (Optional) — SCI and SWI event
inputs
• General Purpose Events — Fully programmable GPE0
Event Block registers
The PCI header is a 256-byte region used for configuring
a PCI device or function. The first 64 bytes are the same
for all PCI devices and are predefined by the PCI specification. These registers are used to configure the PCI for
the device. The rest of the 256-byte region is used to configure the device or function itself.
Revision 4.1
The remaining subsections of this chapter is as follows:
• A brief discussion on how to access the registers
located in the PCI Configuration Space
• Register summary
• Detailed bit formats of all registers
137
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Geode™ CS5530
4.0
Geode™ CS5530
Register Descriptions (Continued)
4.1
PCI CONFIGURATION SPACE AND ACCESS METHODS
Configuration cycles are generated in the processor. All
configuration registers in the CS5530 are accessed
through the PCI interface using the PCI Type One Configuration Mechanism. This mechanism uses two DWORD
I/O locations at 0CF8h and 0CFCh. The first location
(0CF8h) references the Configuration Address Register.
The second location (0CFCh) references the Configuration Data Register.
read or write to the Configuration Data Register (CDR)
causes a PCI configuration cycle to the CS5530. BYTE,
WORD, or DWORD accesses are allowed to the CDR at
0CFCh, 0CFDh, 0CFEh, or 0CFFh.
The CS5530 has six configuration register sets, one for
each function (F0-F4) and USB (PCIUSB). Base Address
Registers (BARs) in the PCI header registers are pointers
for additional I/O or memory mapped configuration registers.
To access PCI configuration space, write the Configuration Address (0CF8h) Register with data that specifies the
CS5530 as the device on PCI being accessed, along with
the configuration register offset. On the following cycle, a
Table 4-1 shows the PCI Configuration Address Register
(0CF8h) and how to access the PCI header registers.
Table 4-1. PCI Configuration Address Register (0CF8h)
30
31
24
23
16
15
11
10
8
7
2
1
0
Configuration
Space Mapping
RSVD
Bus Number
Device Number
Function
Index
DWORD
00
1 (Enable)
000 0000
0000 0000
xxxx x (Note)
xxx
xxxx xx
00 (Always)
1001 0 or 1000 0
000
Index
1001 0 or 1000 0
001
Index
1001 0 or 1000 0
010
Index
1001 0 or 1000 0
011
Index
1001 0 or 1000 0
100
Index
1001 1 or 1000 1
000
Index
Function 0 (F0): Bridge Configuration Register Space
80h
0000 0000
Function 1 (F1): SMI Status and ACPI Timer Register Space
80h
0000 0000
Function 2 (F2): IDE Controller Register Space
80h
0000 0000
Function 3 (F3): XpressAUDIO Subsystem Register Space
80h
0000 0000
Function 4 (F4): Video Controller Register Space
80h
0000 0000
PCIUSB: USB Controller Register Space
80h
0000 0000
Note: The device number depends upon the strapping of pin H26 (HOLD_REQ#) during POR.
Strap pin H26 low: IDSEL = AD28 (Chipset Register Space) and AD29 (USB Register Space)
Strap pin H26 high: IDSEL = AD26 (Chipset Register Space) and AD27 (USB Register Space)
The strapping of pin H26 can be read back in F0 Index 44h[6].
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138
Revision 4.1
4.2
REGISTER SUMMARY
The tables in this subsection summarize all the registers
of the CS5530. Included in the tables are the register’s
reset values and page references where the bit formats
are found.
Table 4-2. Function 0: PCI Header and Bridge Configuration Registers Summary
F0 Index
Width
(Bits)
Type
Name
Reset
Value
Reference
(Table 4-14)
00h-01h
16
RO
Vendor Identification Register
1078h
Page 149
02h-03h
16
RO
Device Identification Register
0100h
Page 149
04h-05h
16
R/W
PCI Command Register
0000h
Page 149
06h-07h
16
R/W
PCI Status Register
0280h
Page 149
08h
8
RO
Device Revision ID Register
xxh
Page 150
09h-0Bh
24
RO
PCI Class Code Register
060100h
Page 150
0Ch
8
R/W
PCI Cache Line Size Register
00h
Page 150
0Dh
8
R/W
PCI Latency Timer Register
00h
Page 150
0Eh
8
RO
PCI Header Type Register
00h
Page 150
0Fh
8
RO
PCI BIST Register
00h
Page 150
10h-3Fh
--
--
--
Page 150
40h
8
R/W
PCI Function Control Register 1
89h
Page 150
41h
8
R/W
PCI Function Control Register 2
10h
Page 151
42h
8
R/W
PCI Function Control Register 3
0Fh
Page 151
43h
8
R/W
USB Shadow Register
03h
Page 152
44h
8
R/W
Reset Control Register
xx000000b
Page 152
45h-4Fh
--
--
50h
8
R/W
51h
8
52h
53h
54h-59h
--
--
5Ah
8
R/W
Reserved
Reserved
--
Page 153
PIT Control/ISA CLK Divider
7Bh
Page 153
R/W
ISA I/O Recovery Control Register
40h
Page 153
8
R/W
ROM/AT Logic Control Register
F8h
Page 153
8
R/W
Alternate CPU Support Register
00h
Page 154
Reserved
Decode Control Register 1
--
Page 154
03h
Page 154
5Bh
8
R/W
Decode Control Register 2
20h
Page 155
5Ch
8
R/W
PCI Interrupt Steering Register 1
00h
Page 155
5Dh
8
R/W
PCI Interrupt Steering Register 2
00h
Page 155
5Eh-6Fh
--
--
--
Page 156
70h-71h
16
R/W
General Purpose Chip Select Base Address Register
0000h
Page 156
72h
8
R/W
General Purpose Chip Select Control Register
73h-7Fh
--
--
80h
8
R/W
81h
8
82h
8
83h
Reserved
00h
Page 156
--
Page 156
Power Management Enable Register 1
00h
Page 156
R/W
Power Management Enable Register 2
00h
Page 157
R/W
Power Management Enable Register 3
00h
Page 158
8
R/W
Power Management Enable Register 4
00h
Page 159
84h
8
RO
Second Level Power Management Status Mirror Register 1
40h
Page 160
85h
8
RO
Second Level Power Management Status Mirror Register 2
00h
Page 161
86h
8
RO
Second Level Power Management Status Mirror Register 3
00h
Page 162
87h
8
RO
Second Level Power Management Status Mirror Register 4
00h
Page 163
88h
8
R/W
General Purpose Timer 1 Count Register
00h
Page 164
89h
8
R/W
General Purpose Timer 1 Control Register
00h
Page 164
8Ah
8
R/W
General Purpose Timer 2 Count Register
00h
Page 165
Reserved
8Bh
8
R/W
General Purpose Timer 2 Control Register
00h
Page 165
8Ch
8
R/W
IRQ Speedup Timer Count Register
00h
Page 165
8Dh
8
R/W
Video Speedup Timer Count Register
00h
Page 165
Revision 4.1
139
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-2. Function 0: PCI Header and Bridge Configuration Registers Summary (Continued)
Width
(Bits)
Type
Name
8Eh
8
R/W
VGA Timer Count Register
8Fh
--
--
90h
8
R/W
91h
8
92h
93h
F0 Index
Reserved
Reset
Value
Reference
(Table 4-14)
00h
Page 165
--
Page 166
GPIO Pin Direction Register 1
00h
Page 166
R/W
GPIO Pin Data Register 1
00h
Page 166
8
R/W
GPIO Control Register 1
00h
Page 167
8
R/W
Miscellaneous Device Control Register
00h
Page 167
94h
8
R/W
Suspend Modulation OFF Count Register
00h
Page 168
95h
8
R/W
Suspend Modulation ON Count Register
00h
Page 168
96h
8
R/W
Suspend Configuration Register
00h
Page 168
97h
8
R/W
GPIO Control Register 2
00h
Page 169
98h-99h
16
R/W
Primary Hard Disk Idle Timer Count Register
0000h
Page 169
9Ah-9Bh
16
R/W
Floppy Disk Idle Timer Count Register
0000h
Page 169
Page 170
9Ch-9Dh
16
R/W
Parallel / Serial Idle Timer Count Register
0000h
9Eh-9Fh
16
R/W
Keyboard / Mouse Idle Timer Count Register
0000h
Page 170
A0h-A1h
16
R/W
User Defined Device 1 Idle Timer Count Register
0000h
Page 170
A2h-A3h
16
R/W
User Defined Device 2 Idle Timer Count Register
0000h
Page 170
A4h-A5h
16
R/W
User Defined Device 3 Idle Timer Count Register
0000h
Page 170
A6h-A7h
16
R/W
Video Idle Timer Count Register
0000h
Page 171
A8h-A9h
16
R/W
Video Overflow Count Register
0000h
Page 171
AAh-ABh
--
--
--
Page 171
ACh-ADh
16
R/W
Secondary Hard Disk Idle Timer Count Register
0000h
Page 171
AEh
8
WO
CPU Suspend Command Register
00h
Page 171
AFh
8
WO
Suspend Notebook Command Register
00h
Page 171
B0h-B3h
--
--
--
Page 171
B4h
8
RO
Floppy Port 3F2h Shadow Register
xxh
Page 172
B5h
8
RO
Floppy Port 3F7h Shadow Register
xxh
Page 172
B6h
8
RO
Floppy Port 1F2h Shadow Register
xxh
Page 172
B7h
8
RO
Floppy Port 1F7h Shadow Register
xxh
Page 172
B8h
8
RO
DMA Shadow Register
xxh
Page 172
B9h
8
RO
PIC Shadow Register
xxh
Page 172
BAh
8
RO
PIT Shadow Register
xxh
Page 173
BBh
8
RO
RTC Index Shadow Register
xxh
Page 173
BCh
8
R/W
Clock Stop Control Register
00h
Page 173
BDh-BFh
--
--
C0h-C3h
32
R/W
C4h-C7h
32
R/W
C8h-CBh
32
CCh
8
CDh
8
CEh
8
CFh
--
--
D0h
8
WO
D1h-EBh
--
--
ECh
8
R/W
EDh-F3h
--
--
--
Page 174
F4h
8
RC
Second Level Power Management Status Register 1
84h
Page 175
F5h
8
RC
Second Level Power Management Status Register 2
00h
Page 176
F6h
8
RC
Second Level Power Management Status Register 3
00h
Page 177
www.national.com
Reserved
Reserved
Reserved
--
Page 173
User Defined Device 1 Base Address Register
00000000h
Page 173
User Defined Device 2 Base Address Register
00000000h
Page 173
R/W
User Defined Device 3 Base Address Register
00000000h
Page 173
R/W
User Defined Device 1 Control Register
00h
Page 174
R/W
User Defined Device 2 Control Register
00h
Page 174
R/W
User Defined Device 3 Control Register
00h
Page 174
Reserved
Software SMI Register
Reserved
Timer Test Register
Reserved
140
--
Page 174
00h
Page 174
--
Page 174
00h
Page 174
Revision 4.1
Table 4-2. Function 0: PCI Header and Bridge Configuration Registers Summary (Continued)
Width
(Bits)
Type
F7h
8
RO/RC
F8h-FFh
--
--
F0 Index
Name
Second Level Power Management Status Register 4
Reserved
Reset
Value
Reference
(Table 4-14)
00h
Page 178
--
Page 178
Table 4-3. Function 1: PCI Header Registers for SMI Status and ACPI Timer Summary
F1 Index
Width
(Bits)
Type
Name
Reset Value
Reference
(Table 4-15)
00h-01h
16
RO
Vendor Identification Register
1078h
Page 179
02h-03h
16
RO
Device Identification Register
0101h
Page 179
04h-05h
16
R/W
PCI Command Register
0000h
Page 179
06h-07h
16
RO
PCI Status Register
0280h
Page 179
08h
8
RO
Device Revision ID Register
09h-0Bh
24
RO
PCI Class Code Register
0Ch
8
RO
PCI Cache Line Size Register
00h
Page 179
0Dh
8
RO
PCI Latency Timer Register
00h
Page 179
0Eh
8
RO
PCI Header Type Register
00h
Page 179
0Fh
8
RO
PCI BIST Register
00h
Page 179
10h-13h
32
R/W
Base Address Register (F1BAR): Sets base address for
memory mapped SMI status and ACPI timer support registers (summarized in Table 4-4).
00000000h
Page 179
14h-FFh
--
--
--
Page 179
Reserved
00h
Page 179
068000h
Page 179
Table 4-4. F1BAR: SMI Status and ACPI Timer Registers Summary
F1BAR+
Memory
Offset
Width
(Bits)
Type
Name
Reset
Value
Reference
(Table 4-16)
00h-01h
16
02h-03h
16
RO
Top SMI Status Mirror Register
0000h
Page 180
RC
Top SMI Status Register
0000h
04h-05h
Page 181
16
RO
Second Level General Traps & Timers Status Mirror
0000h
Page 182
06h-07h
16
RC
Second Level General Traps & Timers Status Register
0000h
Page 183
08h-09h
16
Read to
Enable
SMI Speedup Disable Register
0000h
Page 183
0Ah-1Bh
--
--
--
Page 183
1Ch-1Fh
32
RO
00FFFFFCh
Page 183
--
Page 183
Reserved
ACPI Timer Count
Note: The ACPI Timer Count Register is accessible through
I/O Port 121Ch in Silicon Revision 1.3 and above.
20h-4Fh
50h-FFh
Revision 4.1
--
--
Not Used
Note: The registers located at F1BAR+Memory Offset 50h-FFh can also be accessed at F0 Index 50h-FFh. The preferred method is to program these registers through the F0 Register Space. Refer to Table 4-2 "Function 0: PCI
Header and Bridge Configuration Registers Summary" on page 139 for summary information.
141
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-5. Function 2: PCI Header Registers for IDE Controller Summary
Width
(Bits)
Type
Name
Reset
Value
Reference
(Table 4-17)
00h-01h
16
RO
Vendor Identification Register
1078h
Page 184
02h-03h
04h-05h
16
RO
Device Identification Register
0102h
Page 184
16
R/W
PCI Command Register
0000h
Page 184
06h-07h
16
RO
PCI Status Register
0280h
Page 184
08h
8
RO
Device Revision ID Register
00h
Page 184
09h-0Bh
24
RO
PCI Class Code Register
010180h
Page 184
0Ch
8
RO
PCI Cache Line Size Register
00h
Page 184
0Dh
8
RO
PCI Latency Timer Register
00h
Page 184
0Eh
8
RO
PCI Header Type Register
00h
Page 184
0Fh
8
RO
PCI BIST Register
00h
Page 184
10h-1Fh
--
--
--
Page 184
20h-23h
32
R/W
00000001h
Page 184
24h-FFh
--
--
--
Page 184
F2 Index
Reserved
Base Address Register (F2BAR): Sets base address for I/O
mapped IDE controller configuration registers (summarized
in Table 4-6).
Reserved
Table 4-6. F2BAR: IDE Controller Configuration Registers Summary
F2BAR+
I/O Offset
Width
(Bits)
Type
Name
00h
8
R/W
IDE Bus Master 0 Command Register: Primary
01h
--
--
02h
8
R/W
03h
--
--
04h-07h
32
R/W
IDE Bus Master 0 PRD Table Address: Primary
08h
8
R/W
IDE Bus Master 1 Command Register: Secondary
09h
--
--
0Ah
8
R/W
0Bh
--
--
0Ch-0Fh
32
R/W
10h-1Fh
--
--
20h-23h
32
R/W
Not Used
IDE Bus Master 0 Status Register: Primary
Not Used
Not Used
IDE Bus Master 1 Status Register: Secondary
Not Used
IDE Bus Master 1 PRD Table Address: Secondary
Not Used
Channel 0 Drive 0: PIO Register
Reset
Value
Reference
(Table 4-18)
00h
Page 185
--
Page 185
00h
Page 185
--
Page 185
00000000h
Page 185
00h
Page 185
--
Page 185
00h
Page 186
--
Page 186
00000000h
Page 186
--
Page 186
0000E132h
Page 186
24h-27h
32
R/W
Channel 0 Drive 0: DMA Control Register
00017771h
Page 187
28h-2Bh
32
R/W
Channel 0 Drive 1: PIO Register
0000E132h
Page 187
2Ch-2Fh
32
R/W
Channel 0 Drive 1: DMA Control Register
00017771h
Page 187
30h-33h
32
R/W
Channel 1 Drive 0: PIO Register
0000E132h
Page 187
34h-37h
32
R/W
Channel 1 Drive 0: DMA Control Register
00017771h
Page 187
38h-3Bh
32
R/W
Channel 1 Drive 1: PIO Register
0000E132h
Page 187
3Ch-3Fh
32
R/W
Channel 1 Drive 1: DMA Control Register
00017771h
Page 187
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142
Revision 4.1
Table 4-7. Function 3: PCI Header Registers for XpressAUDIO Subsystem Summary
Width
(Bits)
Type
Name
Reset
Value
Reference
(Table 4-19)
00h-01h
16
RO
Vendor Identification Register
1078h
Page 188
02h-03h
04h-05h
16
RO
Device Identification Register
0103h
Page 188
16
R/W
PCI Command Register
0000h
Page 188
06h-07h
16
RO
PCI Status Register
0280h
Page 188
08h
8
RO
Device Revision ID Register
00h
Page 188
09h-0Bh
24
RO
PCI Class Code Register
040100h
Page 188
0Ch
8
RO
PCI Cache Line Size Register
00h
Page 188
0Dh
8
RO
PCI Latency Timer Register
00h
Page 188
0Eh
8
RO
PCI Header Type Register
00h
Page 188
F3 Index
0Fh
8
RO
PCI BIST Register
10h-13h
32
R/W
Base Address Register (F3BAR): Sets base address for
memory mapped XpressAUDIO subsystem configuration
registers (summarized in Table 4-8).
14h-FFh
--
--
Reserved
00h
Page 188
00000000h
Page 188
--
Page 188
Table 4-8. F3BAR: XpressAUDIO Subsystem Configuration Registers Summary
F3BAR+
Memory
Offset
Width
(Bits)
Type
Name
00h-03h
32
R/W
Codec GPIO Status Register
04h-07h
32
R/W
Codec GPIO Control Register
00000000h
Page 189
08h-0Bh
32
R/W
Codec Status Register
00000000h
Page 189
0Ch-0Fh
32
R/W
Codec Command Register
00000000h
Page 189
10h-11h
16
RO
Second Level Audio SMI Source Mirror Register
0000h
Page 190
12h-13h
16
RC
14h-17h
32
RO/RC
18h-19h
16
R/W
1Ah-1Bh
16
R/W
1Ch-1Dh
16
1Eh-1Fh
16
20h
21h
Second Level Audio SMI Source Register
Reset Value
Reference
(Table 4-20)
00000000h
Page 189
0000h
Page 191
00000000h
Page 192
I/O Trap SMI Enable Register
0000h
Page 193
Internal IRQ Enable Register
0000h
Page 194
R/W
Internal IRQ Control Register
0000h
Page 194
WO
Internal IRQ Mask Register
0000h
Page 194
8
R/W
Audio Bus Master 0 Command Register
00h
Page 195
8
RC
Audio Bus Master 0 SMI Status Register
00h
Page 195
I/O Trap SMI and Fast Write Status Register
22h-23h
--
--
24h-27h
32
R/W
Not Used
28h
8
R/W
Audio Bus Master 1 Command Register
00h
Page 195
29h
8
RC
Audio Bus Master 1 SMI Status Register
00h
Page 196
Audio Bus Master 0 PRD Table Address
Not Used
--
Page 195
00000000h
Page 195
2Ah-2Bh
--
--
2Ch-2Fh
32
R/W
30h
8
R/W
Audio Bus Master 2 Command Register
00h
Page 196
31h
8
RC
Audio Bus Master 2 SMI Status Register
00h
Page 196
Audio Bus Master 1 PRD Table Address
Page 196
Page 196
32h-33h
--
--
34h-37h
32
R/W
38h
8
R/W
Audio Bus Master 3 Command Register
00h
Page 197
39h
8
RC
Audio Bus Master 3 SMI Status Register
00h
Page 197
3Ah-3Bh
--
--
3Ch-3Fh
32
R/W
Revision 4.1
Not Used
-00000000h
Audio Bus Master 2 PRD Table Address
Not Used
Audio Bus Master 3 PRD Table Address
143
--
Page 196
00000000h
Page 196
--
Page 197
00000000h
Page 197
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-8. F3BAR: XpressAUDIO Subsystem Configuration Registers Summary (Continued)
F3BAR+
Memory
Offset
Width
(Bits)
Type
40h
8
R/W
Audio Bus Master 4 Command Register
00h
Page 197
41h
8
RC
Audio Bus Master 4 SMI Status Register
00h
Page 198
Name
Reset Value
42h-43h
--
--
44h-47h
32
R/W
48h
8
R/W
Audio Bus Master 5 Command Register
00h
Page 198
49h
8
RC
Audio Bus Master 5 SMI Status Register
00h
Page 198
4Ah-4Bh
--
--
4Ch-4Fh
32
R/W
Not Used
Reference
(Table 4-20)
Audio Bus Master 4 PRD Table Address
Not Used
Audio Bus Master 5 PRD Table Address
--
Page 198
00000000h
Page 198
--
Page 198
00000000h
Page 198
Table 4-9. Function 4: PCI Header Registers for Video Controller Summary
Width
(Bits)
Type
Name
Reset
Value
Reference
(Table 4-21)
00h-01h
16
02h-03h
16
RO
Vendor Identification
1078h
Page 199
RO
Device Identification
0104h
04h-05h
Page 199
16
R/W
PCI Command
0000h
Page 199
06h-07h
16
RO
PCI Status
0280h
Page 199
08h
8
RO
Device Revision ID
00h
Page 199
09h-0Bh
24
RO
PCI Class Code
0Ch
8
RO
0Dh
8
0Eh
0Fh
F4 Index
030000h
Page 199
PCI Cache Line Size
00h
Page 199
RO
PCI Latency Timer
00h
Page 199
8
RO
PCI Header Type
00h
Page 199
8
RO
PCI BIST Register
00h
Page 199
10h-13h
32
R/W
Base Address Register (F4BAR): Sets base address for
memory mapped video controller configuration registers
(summarized in Table 4-10).
00000000h
Page 199
14h-FFh
--
--
Reserved
Page 199
x
Table 4-10. F4BAR: Video Controller Configuration Registers Summary
F4BAR+
Memory
Offset
00h-03h
Width
(Bits)
Type
Register Name
Reset
Value
Reference
(Table 4-22)
32
R/W
Video Configuration Register
00000000h
Page 200
Page 200
04h-07h
32
R/W
Display Configuration Register
00000000h
08h-0Bh
32
R/W
Video X Register
xxxxxxxxh
Page 201
0Ch-0Fh
32
R/W
Video Y Register
xxxxxxxxh
Page 202
10h-13h
32
R/W
Video Scale Register
xxxxxxxxh
Page 202
14h-17h
32
R/W
Video Color Key Register
xxxxxxxxh
Page 202
18h-1Bh
32
R/W
Video Color Mask Register
xxxxxxxxh
Page 202
1Ch-1Fh
32
R/W
Palette Address Register
xxxxxxxxh
Page 202
20h-23h
32
R/W
Palette Data Register
xxxxxxxxh
Page 202
24h-27h
32
R/W
Dot Clock Configuration Register
00000000h
Page 202
28h-2Bh
32
R/W
CRC Signature and TFT/TV Configuration Register
00000100h
Page 204
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144
Revision 4.1
Table 4-11. PCIUSB 00h-FFh Register Summary
PCIUSB
Index
00h-01h
Width
(Bits)
Type
16
RO
Reset Value
Reference
(Table 4-24)
Vendor Identification
0E11h
Page 206
Name
02h-03h
16
RO
Device Identification
A0F8h
Page 206
04h-05h
16
R/W
Command Register
0000h
Page 206
06h-07h
16
R/W
Status Register
0280h
Page 206
08h
8
RO
Device Revision ID
00h
Page 206
09h-0Bh
24
RO
Class Code
0C0310h
Page 207
0Ch
8
R/W
Cache Line Size
00h
Page 207
0Dh
8
R/W
Latency Timer
00h
Page 207
0Eh
8
RO
Header Type
00h
Page 207
00h
Page 207
00000000h
Page 207
0Fh
8
RO
BIST Register
10h-13h
32
R/W
Base Address Register
14h-3Bh
--
--
3Ch
8
R/W
Interrupt Line Register
3Dh
8
RO
Interrupt Pin Register
01h
Page 207
3Eh
8
RO
Min. Grant Register
00h
Page 207
Reserved
3Fh
8
RO
Max. Latency Register
40h-43h
32
R/W
ASIC Test Mode Enable Register
44h
8
R/W
ASIC Operational Mode Enable
45h-FFh
--
--
Revision 4.1
Reserved
145
--
Page 207
00h
Page 207
00h
Page 207
00000000h
Page 207
00h
Page 207
--
Page 207
www.national.com
Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-12. ISA Legacy I/O Register Summary
I/O Port
Type
Name
Reference
DMA Channel Control Registers (Table 4-25)
000h
R/W
DMA Channel 0 Address Register
001h
R/W
DMA Channel 0 Transfer Count Register
Page 208
002h
R/W
DMA Channel 1 Address Register
Page 208
003h
R/W
DMA Channel 1 Transfer Count Register
Page 208
004h
R/W
DMA Channel 2 Address Register
Page 208
005h
R/W
DMA Channel 2 Transfer Count Register
Page 208
006h
R/W
DMA Channel 3 Address Register
Page 208
007h
R/W
DMA Channel 3 Transfer Count Register
Page 208
008h
Read
DMA Status Register, Channels 3:0
Page 208
Write
Page 208
DMA Command Register, Channels 3:0
Page 208
009h
WO
Software DMA Request Register, Channels 3:0
Page 209
00Ah
R/W
DMA Channel Mask Register, Channels 3:0
Page 209
00Bh
WO
DMA Channel Mode Register, Channels 3:0
Page 209
00Ch
WO
DMA Clear Byte Pointer Command, Channels 3:0
Page 209
00Dh
WO
DMA Master Clear Command, Channels 3:0
Page 209
00Eh
WO
DMA Clear Mask Register Command, Channels 3:0
Page 209
00Fh
WO
DMA Write Mask Register Command, Channels 3:0
Page 209
0C0h
R/W
DMA Channel 4 Address Register (Not used)
Page 209
0C2h
R/W
DMA Channel 4 Transfer Count Register (Not Used)
Page 209
0C4h
R/W
DMA Channel 5 Address Register
Page 209
0C6h
R/W
DMA Channel 5 Transfer Count Register
Page 209
0C8h
R/W
DMA Channel 6 Address Register
Page 209
0CAh
R/W
DMA Channel 6 Transfer Count Register
Page 209
0CCh
R/W
DMA Channel 7 Address Register
Page 209
0CEh
R/W
DMA Channel 7 Transfer Count Register
Page 209
0D0h
Read
DMA Status Register, Channels 7:4
Page 210
Write
DMA Command Register, Channels 7:4
Page 210
0D2h
WO
Software DMA Request Register, Channels 7:4
Page 210
0D4h
R/W
DMA Channel Mask Register, Channels 7:0
Page 210
0D6h
WO
DMA Channel Mode Register, Channels 7:4
Page 210
0D8h
WO
DMA Clear Byte Pointer Command, Channels 7:4
Page 210
0DAh
WO
DMA Master Clear Command, Channels 7:4
Page 210
0DCh
WO
DMA Clear Mask Register Command, Channels 7:4
Page 210
0DEh
WO
DMA Write Mask Register Command, Channels 7:4
Page 210
DMA Page Registers (Table 4-26)
081h
R/W
DMA Channel 2 Low Page Register
Page 211
082h
R/W
DMA Channel 3 Low Page Register
Page 211
083h
R/W
DMA Channel 1 Low Page Register
Page 211
087h
R/W
DMA Channel 0 Low Page Register
Page 211
089h
R/W
DMA Channel 6 Low Page Register
Page 211
08Ah
R/W
DMA Channel 7 Low Page Register
Page 211
08Bh
R/W
DMA Channel 5 Low Page Register
Page 211
08Fh
R/W
ISA Refresh Low Page Register
Page 211
481h
R/W
DMA Channel 2 High Page Register
Page 211
482h
R/W
DMA Channel 3 High Page Register
Page 211
483h
R/W
DMA Channel 1 High Page Register
Page 211
487h
R/W
DMA Channel 0 High Page Register
Page 211
www.national.com
146
Revision 4.1
Table 4-12. ISA Legacy I/O Register Summary (Continued)
I/O Port
Type
Name
Reference
489h
R/W
DMA Channel 6 High Page Register
Page 211
48Ah
R/W
DMA Channel 7 High Page Register
Page 211
48Bh
R/W
DMA Channel 5 High Page Register
Page 211
Programmable Interval Timer Registers (Table 4-27)
040h
041h
042h
Write
PIT Timer 0 Counter
Page 212
Read
PIT Timer 0 Status
Page 212
Write
PIT Timer 1 Counter (Refresh)
Page 212
Read
PIT Timer 1 Status (Refresh)
Page 212
Write
PIT Timer 2 Counter (Speaker)
Page 212
Read
PIT Timer 2 Status (Speaker)
Page 212
Page 212
043h
Write
PIT Mode Control Word Register
043h
R/W
PIT Read-Back Command
Read Status Command
Counter Latch Command
Programmable Interrupt Controller Registers (Table 4-28)
020h / 0A0h
WO
Master / Slave PCI IWC1
Page 213
021h / 0A1h
WO
Master / Slave PIC ICW2
Page 213
021h / 0A1h
WO
Master / Slave PIC ICW3
Page 213
021h / 0A1h
WO
Master / Slave PIC ICW4
Page 213
021h / 0A1h
R/W
Master / Slave PIC OCW1
Page 213
020h / 0A0h
WO
Master / Slave PIC OCW2
Page 213
020h / 0A0h
WO
Master / Slave PIC OCW3
Page 214
020h / 0A0h
RO
Master / Slave PIC Interrupt Request and Service Registers for OCW3
Commands
Page 214
Keyboard Controller Registers (Table 4-29)
060h
R/W
External Keyboard Controller Data Register
061h
R/W
Port B Control Register
Page 215
Page 215
062h
R/W
External Keyboard Controller Mailbox Register
Page 215
064h
R/W
External Keyboard Controller Command Register
Page 215
066h
R/W
External Keyboard Controller Mailbox Register
Page 215
092h
R/W
Port A Control Register
Page 215
Real Time Clock Registers (Table 4-30)
070h
WO
RTC Address Register
Page 215
071h
R/W
RTC Data Register
Page 215
Miscellaneous Registers (Table 4-31)
170h-177h/
376h-377h
R/W
Secondary IDE Registers
Page 216
1F0h-1F7h/
3F6h-3F7h
R/W
Primary IDE Registers
Page 216
4D0h
R/W
Interrupt Edge/Level Select Register 1
Page 216
4D1h
R/W
Interrupt Edge/Level Select Register 2
Page 216
121Ch-121Fh
RO
ACPI Timer Count Register
Page 216
Note: The ACPI Timer Count Register is accessible through I/O Port 121Ch
in Silicon Revision 1.3 and above. Otherwise use F1BAR+Offset 1Ch.
Revision 4.1
147
www.national.com
Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-13. V-ACPI I/O Register Space Summary
ACPI_
BASE
Type
Align
Length
00h-03h
R/W
4
4
P_CNT: Processor Control Register
04h
RO
1
1
05h
--
1
1
06h
R/W
1
1
07h
Reset
Value
Reference
(Table 4-32)
00000000h
Page 217
P_LVL2: Enter C2 Power State Register
00h
Page 217
Reserved
00h
Page 217
SMI_CMD: OS/BIOS Requests Register (ACPI
Enable/Disable Port)
00h
Page 217
00h
Page 218
Name
--
1
1
Reserved
08h-09h
R/W
2
2
PM1A_STS: PM1A Status Register
0000h
Page 218
0Ah-0Bh
R/W
2
2
PM1A_EN: PM1A Enable Register
0000h
Page 218
0Ch-0Dh
R/W
4
2
PM1A_CNT: PM1A Control Register
0000h
Page 218
0Eh-0Fh
R/W
2
2
SETUP_IDX: Setup Index Register (V-ACPI internal
index register)
0000h
Page 219
10h-11h
R/W
2
2
GPE0_STS: General Purpose Event 0 Status Register
0000h
Page 219
12h-13h
R/W
2
2
GPE0_EN: General Purpose Event 0 Enable Register
0000h
Page 220
14h-17h
R/W
4
4
SETUP_DATA: Setup Data Register (V-ACPI internal
data register)
00000000h
Page 220
18h-1Fh
--
8
Reserved: For Future V-ACPI Implementations
--
Page 220
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148
Revision 4.1
4.3
CHIPSET REGISTER SPACE
The Chipset Register Space of the CS5530 is comprised
of five separate functions (Function 0 through 4, F0-F4),
each with its own register space and PCI header registers. F1-F4 have memory or I/O mapped registers from a
Base Address Register (BAR). The PCI header registers
in all functions are very similar.
F0:
F1:
F2:
F3:
F4:
4.3.1 Bridge Configuration Registers - Function 0
The register space designated as Function 0 (F0) contains registers used to configure features (e.g., power
management) and functionality unique to the CS5530. All
registers in Function 0 are directly accessed (i.e., there
are no memory or I/O mapped registers in F0). Table 4-14
gives the bit formats for these registers.
Bridge Configuration Register Space
SMI Status and ACPI Timer Register Space
IDE Controller Register Space
XpressAUDIO Subsystem Register Space
Video Controller Register Space
Note:
The registers at F0 Index 50h-FFh can also be
accessed at F1BAR+Memory Offset 50h-FFh.
However, the preferred method is to program
these registers through the F0 register space.
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers
Bit
Description
Index 00h-01h
15:0
9
Device Identification Register (RO)
Reset Value = 0100h
Device Identification Register (Read Only)
Index 04h-05h
15:10
Reset Value = 1078h
Vendor Identification Register (Read Only)
Index 02h-03h
15:0
Vendor Identification Register (RO)
PCI Command Register (R/W)
Reset Value = 0000h
Reserved: Set to 0.
Fast Back-to-Back Enable (Read Only): This function is not supported when the CS5530 is a master. It is always disabled (always reads 0).
8
SERR#: Allow SERR# assertion on detection of special errors: 0 = Disable (Default); 1 = Enable.
7
Wait Cycle Control (Read Only): This function is not supported in the CS5530. It is always disabled
(always reads 0).
6
Parity Error: Allow the CS5530 to check for parity errors on PCI cycles for which it is a target, and to assert PERR# when
a parity error is detected: 0 = Disable (Default); 1 = Enable.
5
VGA Palette Snoop Enable (Read Only): This function is not supported in the CS5530. It is always disabled (always
reads 0).
4
Memory Write and Invalidate: Allow the CS5530 to do memory write and invalidate cycles, if the PCI Cache Line Register (F0 Index 0Ch) is set to 16 bytes (04h). 0 = Disable (Default); 1 = Enable.
3
Special Cycles: Allow the CS5530 to respond to special cycles: 0 = Disable; 1 = Enable (Default).
This bit must be enabled to allow the CPU Warm Reset internal signal to be triggered from a CPU Shutdown cycle.
2
Bus Master: Allow the CS5530 bus mastering capabilities: 0 = Disable; 1 = Enable (Default).
This bit must be set to 1.
1
Memory Space: Allow the CS5530 to respond to memory cycles from the PCI bus:
0 = Disable; 1 = Enable (Default).
0
I/O Space: Allow the CS5530 to respond to I/O cycles from the PCI bus: 0 = Disable; 1 = Enable (Default).
Index 06h-07h
15
PCI Status Register (R/W)
Reset Value = 0280h
Detected Parity Error: This bit is set whenever a parity error is detected.
Write 1 to clear.
14
Signaled System Error: This bit is set whenever the CS5530 asserts SERR# active.
Write 1 to clear.
13
Received Master Abort: This bit is set whenever a master abort cycle occurs while the CS5530 is the master. A master
abort will occur when a PCI cycle is not claimed, except for special cycles.
Write 1 to clear.
12
Received Target Abort: This bit is set whenever a target abort is received while the CS5530 is the master for the PCI
cycle.
Write 1 to clear.
11
Signaled Target Abort: This bit is set whenever the CS5530 signals a target abort. This occurs when an address parity
error occurs for an address that hits in the active address decode space of the CS5530.
Write 1 to clear.
Revision 4.1
149
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
10:9
8
Description
DEVSEL# Timing: These bits are always 01, as the CS5530 always responds to cycles for which it is an active target
with medium DEVSEL# timing: 00 = Fast; 01 = Medium; 10 = Slow; 11 = Reserved
Data Parity Detected: This bit is set when:
1) The CS5530 asserted PERR# or observed PERR# asserted.
2) The CS5530 is the master for the cycle in which a parity error occurred and the Parity Error bit is set (F0 Index 04h[6]
= 1).
Write 1 to clear.
7
Fast Back-to-Back Capable: As a target, the CS5530 is capable of accepting fast back-to-back transactions:
0 = Disable; 1 = Enable.
This bit is always set to 1.
6:0
Reserved: Set to 0.
Index 08h
7:0
Device Revision ID Register (RO)
Index 09h-0Bh
Index 0Ch
7:0
Reset Value = xxh
Device Revision ID (Read Only): 00h = Silicon Rev 1.2 or below; 13h = Silicon Rev 1.3.
PCI Class Code Register (RO)
Reset Value = 060100h
PCI Cache Line Size Register (R/W)
Reset Value = 00h
PCI Cache Line Size Register: This register sets the size of the PCI cache line, in increments of four bytes. For memory
write and invalidate cycles, the PCI cache line size must be set to 16 bytes (04h), and the Memory Write and Invalidate bit
must be set (F0 Index 04h[4] = 1).
Index 0Dh
PCI Latency Timer Register (R/W)
Reset Value = 00h
7:4
Reserved: Set to 0.
3:0
PCI Latency Timer Value: The PCI Latency Timer Register prevents system lockup when a slave does not respond to a
cycle that the CS5530 masters. If the value is set to 00h (default), the timer is disabled. If the timer is written with any
other value, bits [3:0] become the four most significant bytes in a timer that counts PCI clocks for slave response. The
timer is reset on each valid data transfer. If the counter expires before the next assertion of TRDY# is received, the
CS5530 stops the transaction with a master abort and asserts SERR#, if enabled to do so (F0 Index 04h[8] = 1).
Index 0Eh
7:0
PCI Header Type (RO)
Reset Value = 00h
PCI Header Type Register (Read Only): This register defines the format of this header. This header is of type format 0.
Additionally, bit 7 defines whether this PCI device is a multifunction device (bit 7 = 1) or not (bit 7 = 0).
Index 0Fh
PCI BIST Register (RO)
Reset Value = 00h
7
BIST Capable (Read Only): Is device capable of running a built-in self-test (BIST)? 0 = No; 1 = Yes,
6
Start BIST: Setting this bit to a one starts up a BIST on the device. The device resets this bit when the BIST has been
completed. (Not supported.)
5:4
Reserved (Read Only)
3:0
BIST Completion Code (Read Only): Upon completion of the BIST, the completion code is stored in these bits. A completion code of zero indicates the BIST has successfully been completed. All other values indicate some type of BIST failure.
Index 10h-3Fh
Reserved
Index 40h
PCI Function Control Register 1 (R/W)
7
PCI Interrupt Acknowledge Cycle Response: The CS5530 responds to PCI interrupt acknowledge cycles:
0 = Disable; 1 = Enable.
6
Single Write Mode: The CS5530 accepts only single cycle write transfers as a slave on the PCI bus and performs a target disconnect with the first data transferred: 0 = Disable (accepts burst write cycles); 1 = Enable.
5
Single Read Mode: The CS5530 accepts only single cycle read transfers as a slave on the PCI bus and performs a target disconnect with the first data transferred. 0 = Disable (accepts burst read cycles); 1 = Enable.
4
Retry PCI Cycles: Retry inbound PCI cycles if data is buffered and waiting to go outbound on PCI:
0 = No Retry; 1 = Retry.
3
Write Buffer: PCI slave write buffer: 0 = Disable; 1 = Enable.
2:1
0
Reset Value = 89h
Reserved: Set to 0.
BS8/16: This bit can not be written. Always = 1.
Note: Bits 6 and 5 emulate the behavior of first generation SIO devices developed for PCI. They should normally remain cleared.
www.national.com
150
Revision 4.1
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 41h
PCI Function Control Register 2 (R/W)
Reset Value = 10h
7
Burst to Beat: Bursts are converted to single beats for X-Bus to PCI bus reads: 0 = Disable; 1 = Enable.
6
IDE Configuration Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs to one of the configuration registers in the F2 Register Space, an SMI is
generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[5].
5
PERR# Signals SERR#: Assert SERR# any time that PERR# is asserted or detected active by the CS5530 (allows
PERR# assertion to be cascaded to NMI (SMI) generation in the system): 0 = Disable; 1 = Enable.
4
Write Buffer Enable: Allow 16-byte buffering for X-Bus to PCI bus writes: 0 = Disable; 1 = Enable.
3
Power Management Configuration Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs to one of the configuration registers in the F1 Register Space, an SMI is
generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[5].
2:1
Subtractive Decode: These bits determine the point at which the CS5530 accepts cycles that are not claimed by another
device. The CS5530 defaults to taking subtractive decode cycles in the default cycle clock, but can be moved up to the
Slow Decode cycle point if all other PCI devices decode in the fast or medium clocks. Disabling subtractive decode must
be done with care, as all ISA and ROM cycles are decoded subtractively.
00 = Default sample (4th clock from FRAME# active)
01 = Slow sample (3rd clock from FRAME# active)
1x = No subtractive decode
0
Legacy Configuration SMI: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs to one of the configuration registers in the ISA Legacy I/O Register Space, an
SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[5].
Index 42h
PCI Function Control Register 3 (R/W)
Reset Value = 0Fh
7
USB SMI I/O Configuration: Route USB-generated SMI to SMI# pin: 0 = Disable;
1 = Enable, USB-generated SMI pulls SMI# pin active (low).
6
USB SMI Power Mgmnt Configuration: Route USB-generated SMI to Top Level SMI Status Register, F1BAR+Memory
Offset 00h/02h[14]: 0 = Disable; 1 = Enable.
5
Delayed Transactions: Allow delayed transactions on the PCI bus: 0 = Disable; 1 = Enable.
Also see F0 Index 43h[1].
4
DMA Priority: Allow USB DMA to have priority over other DMA requests: 0 = Disable; 1 = Enable.
3
No X-Bus ARB, Buffer Enable: When the CS5530 is a PCI target, allow buffer PCI transactions without X-Bus
arbitration: 0 = Disable; 1 = Enable.
2
HOLD_REQ# (Pin H26): HOLD_REQ# signal (pin H26): 0 = Disable; 1 = Enable.
Note: Although the HOLD_REQ# signal function is no longer applicable, this bit must remain at its reset value (i.e.,
enabled, set to 1) for non-preemptive arbitration to operate correctly.
1
Video Configuration Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs to one of the configuration registers in the F4 Register Space, an SMI is
generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[5].
0
Audio Configuration SMI: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs to one of the configuration registers in the F3 Register Space, an SMI is
generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[5].
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 43h
USB Shadow Register (R/W)
Reset Value = 03h
7
Reserved: Set to 0.
6
Enable SA20: Pin AD22 configuration: 0 = GPIO4; 1 = SA20. If F0 Index 43h bit 6 or bit 2 is set to 1, then pin AD22 =
SA20.
5
Legacy Cycles Assert HOLD_REQ#: Allow legacy cycles to cause HOLD_REQ# to be asserted:
0 = Disable; 1 = Enable.
Note: The HOLD_REQ# signal function is no longer applicable, this bit must remain at its reset value (i.e., disabled, set
to 0).
4
Read Cycles Assert HOLD_REQ#: Allow read cycles to cause HOLD_REQ# to be asserted:
0 = Disable; 1 = Enable.
Note: The HOLD_REQ# signal function is no longer applicable, this bit must remain at its reset value (i.e., disabled, set
to 0).
3
Any Cycle Asserts HOLD_REQ#: Allow any cycle to cause HOLD_REQ# to be asserted: 0 = Disable; 1 = Enable.
Note: The HOLD_REQ# signal function is no longer applicable, this bit must remain at its reset value (i.e., disabled, set
to 0).
2
Enable SA[23:20]: Pins AF23, AE23, AC21, and AD22 configuration: 0 = GPIO[7:4]; 1 = SA[23:20].
If F0 Index 43h bit 6 or bit 2 is set to 1, then pin AD22 = SA20.
1
PCI Retry Cycles: When the CS5530 is a PCI target and the PCI buffer is not empty, allow PCI bus to retry cycles:
0 = Disable; 1 = Enable.
This bit works in conjunction with PCI bus delayed transactions bit. F0 Index 42h[5] must = 1 for this bit to be valid.
0
USB: USB core: 0 = Disable; 1 = Enable.
Index 44h
7
Reset Control Register (R/W)
Reset Value = xx000000b
ISA Mode: This bit is set to read back the strap value of the INTR pin (pin P26) during POR:
0 = ISA Limited; 1 = ISA Master.
This bit can be written after POR# deasserts to change the ISA mode selected. However, writing to this bit is not recommended due to the actual strapping done on the board.
6
IDSEL Mode: This bit is set to read back the strap value of the HOLD_REQ# pin (pin H26) during POR:
0 = AD28 is IDSEL for Chipset Register Space and AD29 is IDSEL for USB Register Space;
1 = AD26 is IDSEL for Chipset Register Space and AD27 is IDSEL for USB Register Space.
This bit can be written after POR# deasserts to change the IDSEL settings. However, writing to this bit is not recommended due to the actual strapping done on the board.
5:4
3
Clock 32K Control: Controls the source of the CLK_32K pin (AE3):
00 = CLK_32K is internally derived from CLK_14MHZ (pin P24) and is not output on pin AE3 (Default)
01 = CLK_32K is internally derived from CLK_14MHZ (pin P24) and is output on pin AE3
10 = CLK_32K is an input
11 = Invalid
IDE Controller Reset: Reset the IDE Controller: 0 = Disable; 1 = Enable.
Write 0 to clear. This bit is level-sensitive and must be cleared after the reset is enabled.
2
IDE Reset: Reset IDE bus: 0 = Disable; 1 = Enable.
Write 0 to clear. This bit is level-sensitive and must be cleared after the reset is enabled.
1
PCI Reset: Reset PCI bus: 0 = Disable; 1 = Enable.
When set, the CS5530 PCI_RST# output signal (pin C14) is asserted and all devices on the PCI bus including PCIUSB
are reset. No other function within the CS5530 is affected by this bit.
Write 0 to clear. This bit is level-sensitive and must be cleared after the reset is enabled.
0
X-Bus Warm Start: Reading and writing this bit has two different meanings/functions:
Reading this bit: Has a warm start occurred since power-up? 0 = Yes; 1 = No
Writing this bit: 0 = NOP; 1 = Execute system wide reset (used only for clock configuration at power-up)
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 45h-4Fh
Index 50h
Reserved
PIT Control/ISA CLK Divider (R/W)
Reset Value = 7Bh
7
PIT Software Reset: 0 = Disable; 1 = Enable.
6
PIT Counter 1: 0 = Forces Counter 1 output (OUT1) to zero; 1 = Allows Counter 1 output (OUT1) to pass to I/O
Port 061h[4].
5
PIT Counter 1 Enable: 0 = Sets GATE1 input low; 1 = Sets GATE1 input high.
4
PIT Counter 0: 0 = Forces Counter 0 output (OUT0) to zero; 1 = Allows Counter 0 output (OUT0) to pass to IRQ0.
3
PIT Counter 0 Enable: 0 = Sets GATE0 input low; 1 = Sets GATE0 input high.
2:0
ISA Clock Divisor: Determines the divisor of the PCI clock used to make the ISA clock, which is typically
programmed for approximately 8 MHz:
000 = Divide by one
001 = Divide by two
010 = Divide by three
011 = Divide by four
100 = Divide by five
101 = Divide by six
110 = Divide by seven
111 = Divide by eight
If PCI clock = 25 MHz, use setting of 010 (divide by 3). If PCI clock = 30 or 33 MHz, use a setting of 011 (divide by 4).
Index 51h
7:4
ISA I/O Recovery Control Register (R/W)
8-Bit I/O Recovery: These bits determine the number of ISA bus clocks between back-to-back 8-bit I/O read cycles. This
count is in addition to a preset one-clock delay built into the controller.
0000 = 1 PCI clock
0001 = 2 PCI clocks
0010 = 3 PCI clocks
0011 = 4 PCI clocks
3:0
7
0100 = 5 PCI clocks
0101 = 6 PCI clocks
0110 = 7 PCI clocks
0111 = 8 PCI clocks
1000 = 9 PCI clocks
1001 = 10 PCI clocks
1010 = 11 PCI clocks
1011 = 12 PCI clocks
1100 = 13 PCI clocks
1101 = 14 PCI clocks
1110 = 15 PCI clocks
1111 = 16 PCI clocks
16-Bit I/O Recovery: These bits determine the number of ISA bus clocks between back-to-back 16-bit I/O cycles. This
count is in addition to a preset one-clock delay built into the controller.
0000 = 1 PCI clock
0001 = 2 PCI clocks
0010 = 3 PCI clocks
0011 = 4 PCI clocks
Index 52h
Reset Value = 40h
0100 = 5 PCI clocks
0101 = 6 PCI clocks
0110 = 7 PCI clocks
0111 = 8 PCI clocks
1000 = 9 PCI clocks
1001 = 10 PCI clocks
1010 = 11 PCI clocks
1011 = 12 PCI clocks
ROM/AT Logic Control Register (R/W)
1100 = 13 PCI clocks
1101 = 14 PCI clocks
1110 = 15 PCI clocks
1111 = 16 PCI clocks
Reset Value = F8h
Snoop Fast Keyboard Gate A20 and Fast Reset: Enables the snoop logic associated with keyboard commands for
A20 Mask and Reset: 0 = Disable; 1 = Enable (snooping).
If disabled, the keyboard controller handles the commands.
6
Game Port GPORT_CS# on Writes: Allow GPORT_CS# to be asserted for writes to the game port (I/O Port 200h and
201h): 0 = Disable; 1 = Enable.
5
Game Port GPORT_CS# on Reads: Allow GPORT_CS# to be asserted for reads to the game port (I/O Port 200h and
201h): 0 = Disable; 1 = Enable.
4
Enable A20M# Deassertion on Warm Reset: Force A20M# high during a Warm Reset (guarantees that A20M# is deasserted regardless of the state of A20): 0 = Disable; 1 = Enable.
3
Enable I/O Port 092h Decode (Port A): I/O Port 092h decode and the logical functions: 0 = Disable; 1 = Enable.
2
Upper ROM Address Range: KBROMCS# is asserted for ISA memory read accesses:
0 = FFFC0000h-FFFFFFFFh (256 KB, Default); 1 = FF000000h-FFFFFFFFh (16 MB)
Note: PCI Positive decoding for the ROM space is enabled at F0 Index 5Bh[5]).
1
ROM Write Enable: Assert KBROMCS# during writes to configured ROM space (configured in bits 2 and 0),
allowing Flash programming: 0 = Disable; 1 = Enable.
0
Lower ROM Address Range: KBROMCS# is asserted for ISA memory read accesses:
0 = 000F0000h-000FFFFFh (64 KB, Default); 1 = 000E0000h-000FFFFFh (128 KB).
Note: PCI Positive decoding for the ROM space is enabled at F0 Index 5Bh[5]).
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 53h
Alternate CPU Support Register (R/W)
7
Reserved: Set to 0.
6
Game Port Write Blocks ISA: Block ISA cycle on game port (I/O Port 200h and 201h) write:
0 = Disable; 1 = Enable.
5
Bidirectional SMI Enable: 0 = Disable; 1 = Enable.
Reset Value = 00h
This bit must be set to 0.
4
Game Port Read Block ISA: Block ISA cycle on game port (I/O Port 200h and 201h) read: 0 = Disable; 1 = Enable.
3
Game Port Write SMI: Allow SMI generation on writes to game port (I/O Port 200h and 201h):
0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 84h/F4h[4].
For “Game Port Read SMI”, see F0 Index 83h[4].
2
RTC Enable/RTC Pin Configuration: 0 = SMEMW# (Pin AF3) and SMEMR# (Pin AD4), RTC decode disabled;
1 = RTCCS# (Pin AF3) and RTCALE (Pin AD4), RTC decode enabled.
Note: The RTC Index Shadow Register (F0 Index BBh) is independent of the setting of this bit.
1
Reserved: Set to 1.
0
Generate SMI on A20M# toggle: 0 = Disable; 1 = Enable. This bit must be set to 1.
SMI status is reported in F1BAR+Memory Offset 00h/02h[7] (only).
Index 54h-59h
Reserved
Index 5Ah
Decode Control Register 1 (R/W)
Reset Value = 03h
7
Secondary Floppy Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port
372h-375h and 377h: 0 = Subtractive; 1 = Positive.
6
Primary Floppy Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 3F2h-3F5h and
3F7h: 0 = Subtractive; 1 = Positive.
5
COM4 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 2E8h-2EFh:
0 = Subtractive; 1 = Positive.
4
COM3 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 3E8h-3EFh:
0 = Subtractive; 1 = Positive.
3
COM2 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 2F8h-2FFh:
0 = Subtractive; 1 = Positive.
2
COM1 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 3F8h-3FFh:
0 = Subtractive; 1 = Positive.
1
Keyboard Controller Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port
060h and 064h (and 062h/066h if enabled): 0 = Subtractive; 1 = Positive.
0
Real Time Clock Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port
070h and 071h: 0 = Subtractive; 1 = Positive.
Note: Positive decoding by the CS5530 speeds up the I/O cycle time. These I/O Ports do not exist in the CS5530. It is assumed that
if positive decode is enabled, the port exists on the ISA bus.
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 5Bh
Decode Control Register 2 (R/W)
Reset Value = 20h
7
Keyboard I/O Port 062h/066h Decode: This alternate port to the keyboard controller is provided in support of the
8051SL notebook keyboard controller mailbox: 0 = Disable; 1 = Enable.
6
Reserved: Set to 0.
5
BIOS ROM Positive Decode: Selects PCI positive or subtractive decoding for accesses to the configured ROM space:
0 = Subtractive; 1 = Positive.
ROM configuration is at F0 Index 52h[2:0].
4
Secondary IDE Controller Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 170h177h and 376h-377h (excluding writes to 377h): 0 = Subtractive; 1 = Positive.
Note: Subtractive Decode mode disables this IDE controller entirely and routes any register references to the ISA Bus.
3
Primary IDE Controller Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 1F0h1F7h and 3F6h-3F7h (excluding writes to 3F7h): 0 = Subtractive; 1 = Positive.
Note: Subtractive Decode mode disables this IDE controller entirely and routes any register references to the ISA Bus.
2
LPT3 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 3BCh-3BEh and 7BCh7BEh: 0 = Subtractive; 1 = Positive.
1
LPT2 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 278h-27Fh and
678h-67Ah: 0 = Subtractive; 1 = Positive.
0
LPT1 Positive Decode: Selects PCI positive or subtractive decoding for accesses to I/O Port 378h-37Fh and
778h-77Ah: 0 = Subtractive; 1 = Positive.
Note: Positive decoding by the CS5530 speeds up the I/O cycle time. The keyboard, LPT3, LPT2, and LPT1 I/O Ports do not exist in
the CS5530. It is assumed that if positive decode is enabled, the port exists on the ISA bus.
Index 5Ch
7:4
PCI Interrupt Steering Register 1 (R/W)
INTB# Target Interrupt: Selects target interrupt for INTB#:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
3:0
Reset Value = 00h
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
INTA# Target Interrupt: Selects target interrupt for INTA#:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
‘
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
Note: The target interrupt must first be configured as level sensitive via I/O Port 4D0h and 4D1h in order to maintain PCI
interrupt compatibility.
Index 5Dh
7:4
PCI Interrupt Steering Register 2 (R/W)
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
3:0
Reset Value = 00h
INTD# Target Interrupt: Selects target interrupt for INTD#:
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
1000 = RSVD
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = RSVD
1110 = IRQ14
1111 = IRQ15
INTC# Target Interrupt: Selects target interrupt for INTC#:
0000 = Disable
0001 = IRQ1
0010 = RSVD
0011 = IRQ3
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
Note: The target interrupt must first be configured as level sensitive via I/O Port 4D0h and 4D1h in order to maintain PCI
interrupt compatibility.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 5Eh-6Fh
Reserved
Index 70h-71h
General Purpose Chip Select Base Address Register (R/W)
15:0
Reset Value = 0000h
General Purpose Chip Select I/O Base Address: This 16-bit value represents the I/O base address used to enable the
assertion of the GPCS# signal.
This register, together with General Purpose Chip Select Control Register (F0 Index 72h) is used to configure the
operation of the GPCS# pin.
Index 72h
General Purpose Chip Select Control Register (R/W)
Reset Value = 00h
7
General Purpose Chip Select: GPCS# (pin AF26): 0 = Disable; 1 = Enable.
6
Writes Result in Chip Select: Writes to configured I/O address (base address configured in F0 Index 70h and range
configured in bits [4:0]) causes GPCS# signal to be asserted: 0 = Disable; 1 = Enable.
5
Reads Result in Chip Select: Reads from configured I/O address (base address configured in F0 Index 70h and range
configured in bits [4:0]) causes GPCS# signal to be asserted: 0 = Disable; 1 = Enable.
4:0
General Purpose Chip Select I/O Address Range: This 5-bit field selects the range of GPCS# signal:
00000 = 1byte
01111 = 16 bytes
00001 = 2 bytes
11111 = 32 bytes
00011 = 4 bytes
All other combinations are reserved.
00111 = 8 bytes
Note: This register, together with General Purpose Chip Select Base Address Register (F0 Index 70h) is used to configure the operation of the GPCS# pin.
Index 73h-7Fh
Index 80h
7:6
5
Reserved
Power Management Enable Register 1 (R/W)
Reset Value = 00h
Reserved: Set to 0.
Codec SDATA_IN SMI: Allow AC97 codec to generate an SMI due to codec producing a positive edge on SDATA_IN:
0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[2].
4
Video Speedup: Any video activity, as decoded from the serial connection (PSERIAL register, bit 0) from the GXLV
processor disables clock throttling (via SUSP#/SUSPA# handshake) for a configurable duration when the system is power
managed using CPU Suspend modulation. 0 = Disable; 1 = Enable.
The duration of the speedup is configured in the Video Speedup Timer Count Register (F0 Index 8Dh). Detection of an
external VGA access (3Bx, 3, 3Dx and A000h-B7FFh) on the PCI bus is also supported. This configuration is non-standard, but it does allow the power management routines to support an external VGA chip.
3
IRQ Speedup: Any unmasked IRQ (per I/O Port 021h/0A1h) or SMI disables clock throttling (via SUSP#/SUSPA# handshake) for a configurable duration when the system is power managed using CPU Suspend modulation:
0 = Disable; 1 = Enable.
The duration of the speedup is configured in the IRQ Speedup Timer Count Register (F0 Index 8Ch).
2
Traps: Globally enable all power management device I/O traps: 0 = Disable; 1 = Enable.
This excludes the audio I/O traps. They are enabled at F3BAR+Memory Offset 18h.
1
Idle Timers: Globally enable all power management device idle timers: 0 = Disable; 1 = Enable.
Note, disable at this level does not reload the timers on the enable. The timers are disabled at their current counts.
This bit has no effect on the Suspend Modulation OFF/ON Timers (F0 Index 94h/95h).
0
Power Management: Global power management: 0 = Disable; 1 = Enabled.
This bit must be set (1) immediately after POST for power management resources to function.
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Index 81h
7
Description
Power Management Enable Register 2 (R/W)
Reset Value = 00h
Video Access Idle Timer Enable: Turn on Video Idle Timer Count Register (F0 Index A6h) and generate an SMI when
the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the video address range (sets bit 0 of the GXLV processor’s PSERIAL Register) the timer is
reloaded with the programmed count.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[7].
6
User Defined Device 3 (UDEF3) Idle Timer Enable: Turn on UDEF3 Idle Timer Count Register (F0 Index A4h) and
generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the programmed address range the timer is reloaded with the programmed count.
UDEF3 address programming is at F0 Index C8h (base address register) and CEh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[6].
5
User Defined Device 2 (UDEF2) Idle Timer Enable: Turn on UDEF2 Idle Timer Count Register (F0 Index A2h) and
generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the programmed address range the timer is reloaded with the programmed count.
UDEF2 address programming is at F0 Index C4h (base address register) and CDh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[5].
4
User Defined Device 1 (UDEF1) Idle Timer Enable: Turn on UDEF1 Idle Timer Count Register (F0 Index A0h) and
generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the programmed address range the timer is reloaded with the programmed count.
UDEF1 address programming is at F0 Index C0h (base address register) and CCh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[4].
3
Keyboard/Mouse Idle Timer Enable: Turn on Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) and generate
an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[3].
2
Parallel/Serial Idle Timer Enable: Turn on Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch) and generate an
SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[2].
1
Floppy Disk Idle Timer Enable: Turn on Floppy Disk Idle Timer Count Register (F0 Index 9Ah) and generate an SMI
when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges (listed below) the timer is reloaded with the programmed count.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h,
Secondary floppy disk: I/O Port 372h-375h, 377h
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[1].
0
Primary Hard Disk Idle Timer Enable: Turn on Primary Hard Disk Idle Timer Count Register (F0 Index 98h) and
generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges selected in F0 Index 93h[5], the timer is reloaded with the programmed count.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[0].
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 82h
7
Power Management Enable Register 3 (R/W)
Reset Value = 00h
Video Access Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the video address range (sets bit 0 of the GXLV processor’s PSERIAL
Register) an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[7].
6
User Defined Device 3 (UDEF3) Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the programmed address range an SMI is generated. UDEF3 address
programming is at F0 Index C8h (base address register) and CEh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[4].
5
User Defined Device 2 (UDEF2) Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the programmed address range an SMI is generated. UDEF2 address
programming is at F0 Index C4h (base address register) and CDh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[3].
4
User Defined Device 1 (UDEF1) Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the programmed address range an SMI is generated. UDEF1 address
programming is at F0 Index C0h (base address register), and CCh (control register).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[2].
3
Keyboard/Mouse Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[3].
2
Parallel/Serial Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[2].
1
Floppy Disk Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges (listed below) an SMI is generated.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h,
Secondary floppy disk: I/O Port 372h-375h, 377h
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[1].
0
Primary Hard Disk Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges selected in F0 Index 93h[5], an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[0].
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Bit
Index 83h
7
Description
Power Management Enable Register 4 (R/W)
Reset Value = 00h
Secondary Hard Disk Idle Timer Enable: Turn on Secondary Hard Disk Idle Timer Count Register (F0 Index ACh) and
generate an SMI when the timer expires: 0 = Disable; 1 = Enable.
If an access occurs in the address ranges selected in F0 Index 93h[4], the timer is reloaded with the programmed count.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[4].
6
Secondary Hard Disk Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs in the address ranges selected in F0 Index 93h[4], an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[5].
5
ACPI Timer SMI: Allow SMI generation for MSB toggles on the ACPI Timer (F1BAR+Memory Offset 1Ch or I/O Port
121Ch in Silicon Revision 1.3 and above): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[0].
4
Game Port Read SMI: Allow SMI generation on reads to game port (I/O Port 200h and 201h):
0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 84h/8Fh[4].
For “Game Port Write SMI” see F0 Index 53h[3].
3
VGA Timer Enable: Turn on VGA Timer and generate an SMI when the timer reaches 0: 0 = Disable; 1 = Enable
If an access occurs in the programmed address range the timer is reloaded with the programmed count. VGA Timer
programming is at F0 Index 8Eh and F0 Index 8Bh[6]
SMI Status reporting is at F1BAR+Memory Offset 00h/02h[6] (only).
2
Video Retrace Interrupt SMI: Allow SMI generation whenever video retrace occurs: 0 = Disable; 1 = Enable.
This information is decoded from the serial connection (PSERIAL register, bit 7) from the GXLV processor. This function
is normally not used for power management but for softVGA routines.
SMI status reporting is at F1BAR+Memory Offset 00h/02h[5] (only).
1
General Purpose Timer 2 (GP Timer 2) Enable: Turn on GP Timer 2 and generate an SMI when the timer expires:
0 = Disable; 1 = Enable.
This idle timer is reloaded from the assertion of GPIO7 (if programmed to do so). GP Timer 2 programming is at F0 Index
8Ah and 8Bh[5,3,2].
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[1].
0
General Purpose Timer 1 (GP Timer 1) Enable: Turn on GP Timer 1 and generate an SMI when the timer expires:
0 = Disable; 1 = Enable.
This idle timer’s load is multi-sourced and is reloaded any time an enabled event (F0 Index 89h[6:0]) occurs.
GP Timer 1 programming is at F0 Index 88h and 8Bh[4].
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9].
Second level SMI status is reported at F1BAR+Memory Offset 04h/06h[0]
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 84h
7:5
4
Second Level Power Management Status Mirror Register 1 (RO)
Reset Value = 40h
Reserved
Game Port SMI Status (Read Only): SMI was caused by R/W access to game port (I/O Port 200h and 201h)?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
Game Port Read SMI generation enabling is at F0 Index 83h[4].
Game Port Write SMI generation enabling is at F0 Index 53h[3].
3
GPIO7 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO7 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[3].
2
GPIO5 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO5 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[2].
1
GPIO4 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO4 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[1].
0
GPIO3 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO3 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[0].
Notes:
Properly-configured means that the GPIO pin must be enabled: as a GPIO (if multiplexed pin), as an input, and to cause
an SMI.
This register provides status on various power management SMI events to the SMI handler. It is called a Mirror register
since an identical register exists at F0 Index F4h. Reading this register does not clear the status, while reading its counterpart at F0 Index F4h does clear the status.
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Bit
Index 85h
7
Description
Second Level Power Management Status Mirror Register 2 (RO)
Reset Value = 00h
Video Idle Timer SMI Status (Read Only): SMI was caused by expiration of the Video Idle Timer Count Register
(F0 Index A6h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[7].
6
User Defined Device 3 (UDEF3) Idle Timer SMI Status (Read Only): SMI was caused by expiration of the UDEF3 Idle
Timer Count Register (F0 Index A4h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[6].
5
User Defined Device 2 (UDEF2) Idle Timer SMI Status (Read Only): SMI was caused by expiration of the UDEF2 Idle
Timer Count Register (F0 Index A2h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[5].
4
User Defined Device 1 (UDEF1) Idle Timer SMI Status (Read Only): SMI was caused by expiration of the UDEF1 Idle
Timer Count Register (F0 Index A0h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[4].
3
Keyboard/Mouse Idle Timer SMI Status (Read Only): SMI was caused by expiration of the Keyboard/Mouse Idle Timer
Count Register (F0 Index 9Eh)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[3].
2
Parallel/Serial Idle Timer SMI Status (Read Only): SMI was caused by expiration of the Parallel/Serial Port Idle Timer
Count Register (F0 Index 9Ch)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[2].
1
Floppy Disk Idle Timer SMI Status (Read Only): SMI was caused by expiration of the Floppy Disk Idle Timer Count
Register (F0 Index 9Ah)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[1].
0
Primary Hard Disk Idle Timer SMI Status (Read Only): SMI was caused by expiration of the Primary Hard Disk Idle
Timer Count Register (F0 Index 98h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[0].
Note: This register provides status on the Device Idle Timers to the SMI handler. A bit set here indicates that the device was idle for
the duration configured in the Idle Timer Count register for that device, causing an SMI. It is called a Mirror register since an
identical register exists at F0 Index F5h. Reading this register does not clear the status, while reading its counterpart at F0
Index F5h does clear the status.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 86h
7
Second Level Power Management Status Mirror Register 3 (RO)
Reset Value = 00h
Video Access Trap SMI Status (Read Only): SMI was caused by a trapped I/O access to the Video I/O Trap?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[7].
6
Reserved (Read Only)
5
Secondary Hard Disk Access Trap SMI Status (Read Only): SMI was caused by a trapped I/O access to the
secondary hard disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 83h[6].
4
Secondary Hard Disk Idle Timer SMI Status (Read Only): SMI was caused by expiration of Hard Disk Idle Timer Count
Register (F0 Index ACh)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 83h[7].
3
Keyboard/Mouse Access Trap SMI Status (Read Only): SMI was caused by a trapped I/O access to the keyboard or
mouse? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[3].
2
Parallel/Serial Access Trap SMI Status (Read Only): SMI was caused by a trapped I/O access to either the serial or
parallel ports? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[2].
1
Floppy Disk Access Trap SMI Status (Read Only): SMI was caused by a trapped I/O access to the floppy disk?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[1].
0
Primary Hard Disk Access Trap SMI Status (Read Only): SMI was caused by a trapped I/O access to the primary hard
disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[0].
Note: This register provides status on the Device Traps to the SMI handler. A bit set here indicates that an access occurred to the
device while the trap was enabled, causing an SMI. It is called a Mirror register since an identical register exists at F0 Index
F6h of this register. Reading this register does not clear the status, while reading its counterpart at F0 Index F6h does clear the
status.
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Bit
Description
Index 87h
7
Second Level Power Management Status Mirror Register 4 (RO)
Reset Value = 00h
GPIO2 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO2 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[2].
6
GPIO1 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO1 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[1].
5
GPIO0 SMI Status (Read Only): SMI was caused by transition on (properly-configured) GPIO0 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[0].
4
Lid Position (Read Only): This bit maintains the current status of the lid position. If the GPIO6 pin is configured as the lid
switch indicator, this bit reflects the state of the pin.
3
Lid Switch SMI Status (Read Only): SMI was caused by a transition on the GPIO6 (lid switch) pin?
0 = No; 1 = Yes.
For this to happen, the GPIO6 pin must be configured both as an input (F0 Index 90h[6] = 0) and
as the lid switch (F0 Index 92h[6] =1).
2
Codec SDATA_IN SMI Status (Read Only): SMI was caused by AC97 codec producing a positive edge on SDATA_IN?
0 = No; 1 = Yes.
This is the second level of status is reporting. The top level status is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 80h[5].
1
RTC Alarm (IRQ8) SMI Status (Read Only): SMI was caused by an RTC interrupt? 0 = No; 1 = Yes.
This SMI event can only occur while in 3V Suspend and RTC interrupt occurs.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
0
ACPI Timer SMI Status (Read Only): SMI was caused by an ACPI Timer MSB toggle? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[0].
SMI generation configuration is at F0 Index 83h[5].
Notes:
Properly-configured means that the GPIO pin must be enabled as a GPIO (if multiplexed pin), an input, and to cause an
SMI.
This register provides status on several miscellaneous power management events that generate SMIs, as well as the status of the Lid Switch. It is called a Mirror register since an identical register exists at F0 Index F7h. Reading this register
does not clear the status, while reading its counterpart at F0 Index F7h does clear the status.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 88h
7:0
General Purpose Timer 1 Count Register (R/W)
Reset Value = 00h
General Purpose Timer 1 Count: This field represents the load value for GP Timer 1. This value can represent either an
8-bit or 16-bit counter (selected in F0 Index 8Bh[4]). It is loaded into the counter when the timer is enabled (F0 Index
83h[0] =1). Once enabled, an enabled event (configured in F0 Index 89h[6:0]) reloads the timer.
The counter is decremented with each clock of the configured timebase. Upon expiration of the counter, an SMI is generated and the top level SMI status is reported at F1BAR+Memory Offset 00h/02h[9]. The second level SMI status is
reported at F1BAR+Memory Offset 04h/06h[0]).
Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new count value here.
This counter’s timebase can be configured as 1 msec or 1 sec at F0 Index 89h[7].
Index 89h
General Purpose Timer 1 Control Register (R/W)
Reset Value = 00h
7
Timebase for General Purpose Timer 1: Selects timebase for GP Timer 1 (F0 Index 88h): 0 = 1 sec; 1 = 1 msec.
6
Re-trigger General Purpose Timer 1 on User Defined Device 3 (UDEF3) Activity: 0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF3 reloads GP Timer 1. UDEF3 address
programming is at F0 Index C8h (base address register) and CEh (control register).
5
Re-trigger General Purpose Timer 1 on User Defined Device 2 (UDEF2) Activity: 0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF2 reloads GP Timer 1. UDEF2 address
programming is at F0 Index C4h (base address register) and CDh (control register).
4
Re-trigger General Purpose Timer 1 on User Defined Device 1 (UDEF1) Activity: 0 = Disable; 1 = Enable.
Any access to the configured (memory or I/O) address range for UDEF1 reloads GP Timer 1. UDEF1 address
programming is at F0 Index C0h (base address register) and CCh (control register)
3
Re-trigger General Purpose Timer 1 on Keyboard or Mouse Activity: 0 = Disable; 1 = Enable
Any access to the keyboard or mouse I/O address range (listed below) reloads GP Timer 1.
Keyboard Controller: I/O Ports 060h/064h
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)
2
Re-trigger General Purpose Timer 1 on Parallel/Serial Port Activity: 0 = Disable; 1 = Enable.
Any access to the parallel or serial port I/O address range (listed below) reloads the GP Timer 1.
LPT1: I/O Port 378h-37Fh, 778h-77Ah
LPT2: I/O Port 278h-27Fh, 678h-67Ah
COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)
COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)
COM3: I/O Port 3E8h-3EFh
COM4: I/O Port 2E8h-2EFh
1
Re-trigger General Purpose Timer 1 on Floppy Disk Activity: 0 = Disable; 1 = Enable.
Any access to the floppy disk drive address ranges (listed below) reloads GP Timer 1.
Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h
Secondary floppy disk: I/O Port 372h-375h, 377h
The active floppy drive is configured via F0 Index 93h[7].
0
Re-trigger General Purpose Timer 1 on Primary Hard Disk Activity: 0 = Disable; 1 = Enable.
Any access to the primary hard disk drive address range selected in F0 Index 93h[5] reloads GP Timer 1.
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Bit
Description
Index 8Ah
7:0
General Purpose Timer 2 Count Register (R/W)
Reset Value = 00h
General Purpose Timer 2 Count: This field represents the load value for GP Timer 2. This value can represent either an
8-bit or 16-bit counter (configured in F0 Index 8Bh[5]). It is loaded into the counter when the timer is enabled (F0 Index
83h[1] = 1). Once the timer is enabled and a transition occurs on GPIO7, the timer is re-loaded.
The counter is decremented with each clock of the configured timebase. Upon expiration of the counter, an SMI is generated and the top level of status is F1BAR+Memory Offset 00h/02h[9] and the second level of status is reported in
F1BAR+Memory Offset 04h/06h[1]).
Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new count value here.
For GPIO7 to act as the reload for this counter, it must be enabled as such (F0 Index 8Bh[2]) and be configured as an
input (F0 Index 90h[7]).
This counter’s timebase can be configured as 1 msec or 1 sec in F0 Index 8Bh[3].
Index 8Bh
7
General Purpose Timer 2 Control Register (R/W)
Reset Value = 00h
Re-trigger General Purpose Timer 1 on Secondary Hard Disk Activity: 0 = Disable; 1 = Enable.
Any access to the secondary hard disk drive address range selected in F0 Index 93h[4] reloads GP Timer 1.
6
VGA Timer Base: Selects timebase for VGA Timer Register (F0 Index 8Eh): 0 = 1 ms; 1 = 32 µs.
5
General Purpose Timer 2 Shift: GP Timer 2 is treated as an 8-bit or 16-bit timer: 0 = 8-bit; 1 = 16-bit.
As an 8-bit timer, the count value is loaded into GP Timer 2 Count Register (F0 Index 8Ah).
As a 16-bit timer, the value loaded into GP Timer 2 Count Register is shifted left by eight bits, the lower eight bits become
zero, and this 16-bit value is used as the count for GP Timer 2.
4
General Purpose Timer 1 Shift: GP Timer 1 is treated as an 8-bit or 16-bit timer: 0 = 8-bit; 1 = 16-bit.
As an 8-bit timer, the count value is that loaded into GP Timer 1 Count Register (F0 Index 88h).
As a 16-bit timer, the value loaded into GP Timer 1 Count Register is shifted left by eight bit, the lower eight bits become
zero, and this 16-bit value is used as the count for GP Timer 1.
3
Time Basis for General Purpose Timer 2: Selects timebase for GP Timer 2 (F0 Index 8Ah): 0 = 1 sec; 1 = 1 msec.
2
Re-trigger General Purpose Timer 2 on GPIO7 Pin Transition: A configured transition on the GPIO7 pin reloads GP
Timer 2 (F0 Index 8Ah): 0 = Disable; 1 = Enable.
F0 Index 92h[7] selects whether a rising- or a falling-edge transition acts as a reload. For GPIO7 to work here, it must first
be configured as an input (F0 Index 90h[7] = 0).
1:0
Index 8Ch
7:0
Reserved: Set to 0.
IRQ Speedup Timer Count Register (R/W)
Reset Value = 00h
IRQ Speedup Timer Count: This field represents the load value for the IRQ speedup timer. It is loaded into the counter
when Suspend Modulation is enabled (F0 Index 96h[0] = 1) and an INTR or an access to I/O Port 061h occurs. When the
event occurs, the Suspend Modulation logic is inhibited, permitting full performance operation of the CPU. Upon expiration, no SMI is generated; the Suspend Modulation begins again. The IRQ speedup timer’s timebase is 1 ms.
This speedup mechanism allows instantaneous response to system interrupts for full-speed interrupt processing. A typical value here would be 2 to 4 ms.
Index 8Dh
7:0
Video Speedup Timer Count Register (R/W)
Reset Value = 00h
Video Speedup Timer Count: This field represents the load value for the Video speedup timer. It is loaded into the
counter when Suspend Modulation is enabled (F0 Index 96h[0] = 1) and any access to the graphics controller occurs.
When a video access occurs, the Suspend Modulation logic is inhibited, permitting full-performance operation of the
CPU. Upon expiration, no SMI is generated; the Suspend Modulation begins again. The video speedup timer’s timebase
is 1 ms.
This speedup mechanism allows instantaneous response to video activity for full speed during video processing calculations. A typical value here would be 50 to 100 ms.
Index 8Eh
7:0
VGA Timer Count Register (R/W)
Reset Value = 00h
VGA Timer Load Value: This field represents the load value for VGA Timer. It is loaded into the counter when the timer is
enabled (F0 Index 83h[3] = 1). The counter is decremented with each clock of the configured timebase (F0 Index 8Bh[6]).
Upon expiration of the counter, an SMI is generated and the status is reported in F1BAR+Memory Offset 00h/02h[6]
(only). Once expired, this counter must be re-initialized by either disabling and enabling it, or writing a new count value
here.
This counter’s timebase is 1 ms.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 8Fh
Reserved
Index 90h
GPIO Pin Direction Register 1 (R/W)
7
GPIO7 Direction: Selects if GPIO7 is an input or output: 0 = Input; 1 = Output.
6
GPIO6 Direction: Selects if GPIO6 is an input or output: 0 = Input; 1 = Output.
5
GPIO5 Direction: Selects if GPIO5 is an input or output: 0 = Input; 1 = Output.
4
GPIO4 Direction: Selects if GPIO4 is an input or output: 0 = Input; 1 = Output.
3
GPIO3 Direction: Selects if GPIO3 is an input or output: 0 = Input; 1 = Output.
2
GPIO2 Direction: Selects if GPIO2 is an input or output: 0 = Input; 1 = Output.
1
GPIO1 Direction: Selects if GPIO1 is an input or output: 0 = Input; 1 = Output.
0
GPIO0 Direction: Selects if GPIO0 is an input or output: 0 = Input; 1 = Output.
Reset Value = 00h
Note: Several of these pins have specific alternate functions. The direction configured here must be consistent with the pins’ use as
the alternate function.
Index 91h
GPIO Pin Data Register 1 (R/W)
7
GPIO7 Data: Reflects the level of GPIO7: 0 = Low; 1 = High.
6
GPIO6 Data: Reflects the level of GPIO6: 0 = Low; 1 = High.
5
GPIO5 Data: Reflects the level of GPIO5: 0 = Low; 1 = High.
4
GPIO4 Data: Reflects the level of GPIO4: 0 = Low; 1 = High.
3
GPIO3 Data: Reflects the level of GPIO3: 0 = Low; 1 = High.
2
GPIO2 Data: Reflects the level of GPIO2: 0 = Low; 1 = High.
1
GPIO1 Data: Reflects the level of GPIO1: 0 = Low; 1 = High.
0
GPIO0 Data: Reflects the level of GPIO0: 0 = Low; 1 = High.
Reset Value = 00h
Note: This register contains the direct values of GPIO[7:0] pins. Write operations are valid only for bits defined as output. Reads from
this register read the last written value if the pin is an output. The pins are configured as inputs or outputs in F0 Index 90h.
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Bit
Description
Index 92h
GPIO Control Register 1 (R/W)
Reset Value = 00h
7
GPIO7 Edge Sense for Reload of General Purpose Timer 2: Selects which edge transition of GPIO7 causes
GP Timer 2 to reload: 0 = Rising; 1 = Falling, (Note 2)
6
GPIO6 Enabled as Lid Switch: Allow GPIO6 to act as the lid switch input: 0 = GPIO6; 1 = Lid switch.
When enabled, every transition of the GPIO6 pin causes the lid switch status to toggle and generate an SMI.
The top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[3].
If GPIO6 is enabled as the lid switch, F0 Index 87h/F7h[4] reports the current status of the lid’s position.
5
GPIO2 Edge Sense for SMI: Selects which edge transition of the GPIO2 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 2 must be set to enable this bit.
4
GPIO1 Edge Sense for SMI: Selects which edge transition of the GPIO1 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 1 must be set to enable this bit.
3
GPIO0 Edge Sense for SMI: Selects which edge transition of the GPIO0 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 1 must be set to enable this bit.
2
Enable GPIO2 as an External SMI Source: Allow GPIO2 to be an external SMI source and generate an SMI on either a
rising or falling edge transition (depends upon setting of bit 5): 0 = Disable; 1 = Enable (Note 3).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 87h/F7h[7].
1
Enable GPIO1 as an External SMI Source: Allow GPIO1 to be an external SMI source and generate an SMI on either a
rising- or falling-edge transition (depends upon setting of bit 4): 0 = Disable; 1 = Enable (Note 3).
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 87h/F7h[6].
0
Enable GPIO0 as an External SMI Source: Allow GPIO0 to be an external SMI source and generate an SMI on either a
rising or falling edge transition (depends upon setting of bit 3): 0 = Disable; 1 = Enable (Note 3)
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 87h/F7h[5].
Notes: 1) For any of the above bits to function properly, the respective GPIO pin must be configured as an input (F0 Index 90h).
2) GPIO7 can generate an SMI (F0 Index 97h[3]) or re-trigger General Purpose Timer 2 (F0 Index 8Bh[2]) or both.
3) If GPIO[2:0] are enabled as external SMI sources, they are the only GPIOs that can be used as SMI sources to wake-up the
system from Suspend when the clocks are stopped.
Index 93h
7
Miscellaneous Device Control Register (R/W)
Reset Value = 00h
Floppy Drive Port Select: All system resources used to power manage the floppy drive use the primary or secondary
FDC addresses for decode: 0 = Secondary; 1 = Primary.
6
Reserved: This bit must always be set to 1.
5
Partial Primary Hard Disk Decode: This bit is used to restrict the addresses which are decoded as primary hard disk
accesses.
0 = Power management monitors all reads and writes I/O Port 1F0h-1F7h, 3F6h-3F7h (excludes writes to 3F7h)
1 = Power management monitors only writes to I/O Port 1F6h and 1F7h
4
Partial Secondary Hard Disk Decode: This bit is used to restrict the addresses which are decoded as secondary hard
Disk accesses.
0 = Power management monitors all reads and writes I/O Port 170h-177h, 376h-377h (excludes writes to 377h)
1 = Power management monitors only writes to I/O Port 176h and 177h
3:2
Reserved: Set to 0.
1
Mouse on Serial Enable: Mouse is present on a Serial Port: 0 = No; 1 = Yes. (Note)
0
Mouse Port Select: Selects which serial port the mouse is attached to: 0 = COM1; 1 = COM2. (Note)
Note: Bits 1 and 0 - If a mouse is attached to a serial port (bit 1 = 1), that port is removed from the serial device list being used to
monitor serial port access for power management purposes and added to the keyboard/mouse decode. This is done because
a mouse, along with the keyboard, is considered an input device and is used only to determine when to blank the screen.
These bits determine the decode used for the Keyboard/Mouse Idle Timer Count Register (F0 Index 9Eh) as well as the Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch).
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 94h
7:0
Suspend Modulation OFF Count Register (R/W)
Reset Value = 00h
Suspend Signal Deasserted Count: This 8-bit counter represents the number of 32 µs intervals that the SUSP#
pin will be deasserted to the GXLV processor. This counter, together with the Suspend Modulation ON Count Register (F0
Index 95h), perform the Suspend Modulation function for CPU power management. The ratio of the on-to-off count sets
up an effective (emulated) clock frequency, allowing the power manager to reduce CPU power consumption.
This counter is prematurely reset if an enabled speedup event occurs. The speedup events are IRQ speedups and video
speedups.
Index 95h
7:0
Suspend Modulation ON Count Register (R/W)
Reset Value = 00h
Suspend Signal Asserted Count: This 8-bit counter represents the number of 32 µs intervals that the SUSP# pin will be
asserted. This counter, together with the Suspend Modulation OFF Count Register (F0 Index 94h), perform the Suspend
Modulation function for CPU power management. The ratio of the on-to-off count sets up an effective (emulated) clock
frequency, allowing the power manager to reduce CPU power consumption.
This counter is prematurely reset if an enabled speedup event occurs. The speedup events are IRQ speedups and video
speedups.
Index 96h
7:3
Suspend Configuration Register (R/W)
Reset Value = 00h
Reserved: Set to 0.
2
Suspend Mode Configuration: “Special 3 Volt Suspend” mode to support powering down a GXLV processor during
Suspend: 0 = Disable; 1 = Enable.
1
SMI Speedup Configuration: Selects how Suspend Modulation function reacts when an SMI occurs:
0 = Use the IRQ Speedup Timer Count Register (F0 Index 8Ch) to temporarily disable Suspend Modulation when an SMI
occurs.
1 = Disable Suspend Modulation when an SMI occurs until a read to the SMI Speedup Disable Register (F1BAR+Memory
Offset 08h).
The purpose of this bit is to disable Suspend Modulation while the CPU is in the System Management Mode so that VSA
technology and Power Management operations occur at full speed. Two methods for accomplishing this are either to map
the SMI into the IRQ Speedup Timer Count Register (F0 Index 8Ch), or to have the SMI disable Suspend Modulation until
the SMI handler reads the SMI Speedup Disable Register (F1BAR+Memory Offset 08h). The latter is the preferred
method. The IRQ speedup method is provided for software compatibility with earlier revisions of the CS5530. This bit has
no effect if the Suspend Modulation feature is disabled (bit 0 = 0).
0
Suspend Modulation Feature Enable: Suspend Modulation feature: 0 = Disable; 1 = Enable.
When enabled, the SUSP# pin will be asserted and deasserted for the durations programmed in the
Suspend Modulation OFF/ON Count Registers (F0 Index 94h/95h).
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 97h
7
GPIO Control Register 2 (R/W)
Reset Value = 00h
GPIO7 Edge Sense for SMI: Selects which edge transition of the GPIO7 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 3 must be set to enable this bit.
6
GPIO5 Edge Sense for SMI: Selects which edge transition of the GPIO5 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 2 must be set to enable this bit.
5
GPIO4 Edge Sense for SMI: Selects which edge transition of the GPIO4 pin generates an SMI:
0 = Rising; 1 = Falling.
Bit 1 must be set to enable this bit.
4
GPIO3 Edge Sense for SMI: Selects which edge transition of the GPIO3 pin will cause an external SMI:
0 = Rising; 1 = Falling.
Bit 0 must be set to enable this bit.
3
Enable GPIO7 as an External SMI Source: Allow GPIO7 to be an external SMI source and to generate an SMI on either
a rising or falling edge transition (depends upon setting of bit 7): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[3].
2
Enable GPIO5 as an External SMI Source: Allow GPIO5 to be an external SMI source and to generate an SMI on either
a rising or falling edge transition (depends upon setting of bit 6): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[2].
1
Enable GPIO4 as an External SMI Source: Allow GPIO4 to be an external SMI source and to generate an SMI on either
a rising- or falling-edge transition (depends upon setting of bit 5): 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[1].
0
Enable GPIO3 as an External SMI Source: Allow GPIO3 to be an external SMI source and to generate an SMI on either
a rising or falling edge transition (depends upon setting of bit 4) 0 = Disable; 1 = Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status reporting is at F0 Index 84h/F4h[0].
Note: For any of the above bits to function properly, the respective GPIO pin must be configured as an input (F0 Index 90h).
Index 98h-99h
15:0
Primary Hard Disk Idle Timer Count Register (R/W)
Reset Value = 0000h
Primary Hard Disk Idle Timer Count: This idle timer is used to determine when the primary hard disk is not in use so
that it can be powered down. The 16-bit value programmed here represents the period of primary hard disk inactivity after
which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access
occurs to the configured primary hard disk’s data port (configured in F0 Index 93h[5]). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[0] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[0].
Index 9Ah-9Bh
15:0
Floppy Disk Idle Timer Count Register (R/W)
Reset Value = 0000h
Floppy Disk Idle Timer Count: This idle timer is used to determine when the floppy disk drive is not in use so that it can
be powered down. The 16-bit value programmed here represents the period of floppy disk drive inactivity after which the
system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an access occurs to the
configured floppy drive’s data port (I/O Port 3F5h or 375h). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[1] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[1].
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index 9Ch-9Dh
15:0
Parallel / Serial Idle Timer Count Register (R/W)
Reset Value = 0000h
Parallel / Serial Idle Timer Count: This idle timer is used to determine when the parallel and serial ports are not in use
so that the ports can be power managed. The 16-bit value programmed here represents the period of inactivity for these
ports after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to the parallel (LPT) or serial (COM) I/O address spaces. If the mouse is enabled on a serial port, that port
is not considered here. The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[2] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[2].
Index 9Eh-9Fh
15:0
Keyboard / Mouse Idle Timer Count Register (R/W)
Reset Value = 0000h
Keyboard / Mouse Idle Timer Count: This idle timer determines when the keyboard and mouse are not in use so that
the LCD screen can be blanked. The 16-bit value programmed here represents the period of inactivity for these ports
after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to either the keyboard or mouse I/O address spaces, including the mouse serial port address space when
a mouse is enabled on a serial port. The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[3] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[3].
Index A0h-A1h
15:0
User Defined Device 1 Idle Timer Count Register (R/W)
Reset Value = 0000h
User Defined Device 1 (UDEF1) Idle Timer Count: This idle timer determines when the device configured as UDEF1 is
not in use so that it can be power managed. The 16-bit value programmed here represents the period of inactivity for this
device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to memory or I/O address space configured in F0 Index C0h (base address register) and F0 Index CCh
(control register). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[4] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[4].
Index A2h-A3h
15:0
User Defined Device 2 Idle Timer Count Register (R/W)
Reset Value = 0000h
User Defined Device 2 (UDEF2) Idle Timer Count: This idle timer determines when the device configured as UDEF2 is
not in use so that it can be power managed. The 16-bit value programmed here represents the period of inactivity for this
device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to memory or I/O address space configured in the F0 Index C4h (base address register) and F0 Index CDh
(control register). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[5] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[5].
Index A4h-A5h
15:0
User Defined Device 3 Idle Timer Count Register (R/W)
Reset Value = 0000h
User Defined Device 3 (UDEF3) Idle Timer Count: This idle timer determines when the device configured as UDEF3 is
not in use so that it can be power managed. The 16-bit value programmed here represents the period of inactivity for this
device after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to memory or I/O address space configured in the UDEF3 Base Address Register (F0 Index C8h) and
UDEF3 Control Register (F0 Index CEh). The counter uses a 1 second timebase.
To enable this timer set F0 Index 81h[6] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[6].
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index A6h-A7h
15:0
Video Idle Timer Count Register (R/W)
Reset Value = 0000h
Video Idle Timer Count: This idle timer determines when the graphics subsystem has been idle as part of the
Suspend-determination algorithm. The 16-bit value programmed here represents the period of video inactivity after which
the system is alerted via an SMI. The count in this timer is automatically reset whenever an access occurs to the graphics
controller space. The counter uses a 1 second timebase.
In a GXLV processor based system the graphics controller is embedded in the CPU, so video activity is communicated to
the CS5530 via the serial connection (PSERIAL register, bit 0) from the processor. The CS5530 also detects accesses to
standard VGA space on PCI (3Bxh, 3h, 3Dxh and A000h-B7FFh) in the event an external VGA controller is being used.
To enable this timer set F0 Index 81h[7] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 85h/F5h[7].
Index A8h-A9h
15:0
Video Overflow Count Register (R/W)
Video Overflow Count: Each time the Video Speedup Counter (F0 Index 8Dh) is triggered, a 100 ms timer is started. If
the 100 ms timer expires before the Video Speedup Counter lapses, the Video Overflow Count Register increments and
the 100 ms timer re-triggers. Software clears the overflow register when new evaluations are to begin. The count contained in this register may be combined with other data to determine the type of video accesses present in the system.
Index AAh-ABh
Reserved
Index ACh-ADh
Secondary Hard Disk Idle Timer Count Register (R/W)
15:0
Reset Value = 0000h
Reset Value = 0000h
Secondary Hard Disk Idle Timer Count: This idle timer is used to determine when the secondary hard disk is not in use
so that it can be powered down. The 16-bit value programmed here represents the period of secondary hard disk inactivity after which the system is alerted via an SMI. The timer is automatically reloaded with the count value whenever an
access occurs to the configured secondary hard disk’s data port (configured in F0 Index 93h[4]). The counter uses a 1
second timebase.
To enable this timer set F0 Index 83h[7] = 1.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 86h/F6h[4].
Index AEh
7:0
CPU Suspend Command Register (WO)
Reset Value = 00h
Software CPU Suspend Command (Write Only): If bit 0 in the Clock Stop Control Register is set low (F0 Index BCh[0]
= 0), a write to this register causes a SUSP#/SUSPA# handshake with the CPU, placing the CPU in a low-power state.
The data written is irrelevant. Once in this state, any unmasked IRQ or SMI releases the CPU halt
condition.
If F0 Index BCh[0] = 1, writing to this register invokes a full system Suspend. In this case, the SUSP_3V pin is asserted
after the SUSP#/SUSPA# halt. Upon a Resume event (see Note), the PLL delay programmed in the F0 Index BCh[7:4] is
invoked, allowing the clock chip and CPU PLL to stabilize before deasserting the SUSP# pin.
Note: If the clocks are stopped the external IRQ4 and IRQ3 pins, when enabled (F3BAR+Memory Offset 1Ah[4:3]), are
the only IRQ pins that can be used as a Resume event. If GPIO2, GPIO1, and GPIO0 are enabled as an external
SMI source (F0 Index 92h[2:0]), they too can be used as a Resume event. No other CS5530 pins can be used to
wake-up the system from Suspend when the clocks are stopped. As long as the 32 KHz clock remains active,
internal SMI events are also Resume events.
Index AFh
7:0
Suspend Notebook Command Register (WO)
Reset Value = 00h
Software CPU Stop Clock Suspend (Write Only): A write to this register causes a SUSP#/SUSPA# handshake with the
CPU, placing the CPU in a low-power state. Following this handshake, the SUSP_3V pin is asserted. The SUSP_3V pin
is intended to be used to stop all system clocks.
Upon a Resume event (see note), the SUSP_3V pin is deasserted. After a slight delay, the CS5530 deasserts the SUSP#
signal. Once the clocks are stable, the processor deasserts SUSPA# and system operation resumes.
Note: If the clocks are stopped the external IRQ4 and IRQ3 pins, when enabled (F3BAR+Memory Offset 1Ah[4:3]), are
the only IRQ pins that can be used as a Resume event. If GPIO2, GPIO1, and GPIO0 are enabled as an external
SMI source (F0 Index 92h[2:0]), they too can be used as a Resume event. No other CS5530 pins can be used to
wake-up the system from Suspend when the clocks are stopped.
Index B0h-B3h
Revision 4.1
Reserved
171
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index B4h
7:0
Floppy Port 3F2h Shadow Register (RO)
Reset Value = xxh
Floppy Port 3F2h Shadow (Read Only): Last written value of I/O Port 3F2h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
Index B5h
7:0
Floppy Port 3F7h Shadow Register (RO)
Reset Value = xxh
Floppy Port 3F7h Shadow (Read Only): Last written value of I/O Port 3F7h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
Index B6h
7:0
Floppy Port 1F2h Shadow Register (RO)
Reset Value = xxh
Floppy Port 1F2h Shadow (Read Only): Last written value of I/O Port 1F2h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
Index B7h
7:0
Floppy Port 1F7h Shadow Register (RO)
Reset Value = xxh
Floppy Port 1F7h Shadow (Read Only): Last written value of I/O Port 1F7h. Required for support of FDC power
ON/OFF and Zero Volt Suspend/Resume coherency.
This register is a copy of an I/O register which cannot safely be directly read. Value in register is not deterministic of when
the register is being read. It is provided here to assist in a Save-to-Disk operation.
Index B8h
7:0
DMA Shadow Register (RO)
Reset Value = xxh
DMA Shadow (Read Only): This 8-bit port sequences through the following list of shadowed DMA Controller registers. At
power on, a pointer starts at the first register in the list and consecutively reads incrementally through it. A write to this
register resets the read sequence to the first register. Each shadow register in the sequence contains the last data written
to that location.
The read sequence for this register is:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
DMA Channel 0 Mode Register
DMA Channel 1 Mode Register
DMA Channel 2 Mode Register
DMA Channel 3 Mode Register
DMA Channel 4 Mode Register
DMA Channel 5 Mode Register
DMA Channel 6 Mode Register
DMA Channel 7 Mode Register
DMA Channel Mask Register (bit 0 is channel 0 mask, etc.)
DMA Busy Register (bit 0 or 1 means a DMA occurred within last 1ms, all other bits are 0)
Index B9h
7:0
PIC Shadow Register (RO)
Reset Value = xxh
PIC Shadow (Read Only): This 8-bit port sequences through the following list of shadowed Programmable Interrupt Controller registers. At power on, a pointer starts at the first register in the list and consecutively reads incrementally through
it. A write to this register resets the read sequence to the first register. Each shadow register in the sequence contains the
last data written to that location.
The read sequence for this register is:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
PIC1 ICW1
PIC1 ICW2
PIC1 ICW3
PIC1 ICW4 - Bits [7:5] of ICW4 are always 0
PIC1 OCW2 - Bits [6:3] of OCW2 are always 0 (Note)
PIC1 OCW3 - Bits [7, 4] are 0 and bit [6, 3] are 1
PIC2 ICW1
PIC2 ICW2
PIC2 ICW3
PIC2 ICW4 - Bits [7:5] of ICW4 are always 0
PIC2 OCW2 - Bits [6:3] of OCW2 are always 0 (Note)
PIC2 OCW3 - Bits [7, 4] are 0 and bit [6, 3] are 1
Note: To restore OCW2 to shadow register value, write the appropriate address twice. First with the shadow register
value, then with the shadow register value ORed with C0h.
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index BAh
7:0
PIT Shadow Register (RO)
Reset Value = xxh
PIT Shadow (Read Only): This 8-bit port sequences through the following list of shadowed Programmable Interval Timer
registers. At power on, a pointer starts at the first register in the list and consecutively reads to increment through it. A
write to this register resets the read sequence to the first register. Each shadow register in the sequence contains the last
data written to that location.
The read sequence for this register is:
1. Counter 0 LSB (least significant byte)
2. Counter 0 MSB
3. Counter 1 LSB
4. Counter 1 MSB
5. Counter 2 LSB
6. Counter 2 MSB
7. Counter 0 Command Word
8. Counter 1 Command Word
9. Counter 2 Command Word
Note: The LSB/MSB of the count is the Counter base value, not the current value.
Bits [7:6] of the command words are not used.
Index BBh
RTC Index Shadow Register (RO)
7:0
RTC Index Shadow (Read Only): The RTC Shadow register contains the last written value of the RTC Index
register (I/O Port 070h).
Index BCh
Clock Stop Control Register (R/W)
7:4
Reset Value = xxh
Reset Value = 00h
PLL Delay: The programmed value in this field sets the delay (in milliseconds) after a break event occurs before the
SUSP# pin is deasserted to the CPU. This delay is designed to allow the clock chip and CPU PLL to stabilize before starting execution. This delay is only invoked if the STP_CLK bit (bit 0) was set.
The four-bit field allows values from 0 to 15 ms.
0000 = 0 ms
0001 = 1 ms
0010 = 2 ms
0011 = 3 ms
3:1
0100 = 4 ms
0101 = 5 ms
0110 = 6 ms
0111 = 7 ms
1000 = 8 ms
1001 = 9 ms
1010 = 10 ms
1011 = 11 ms
1100 = 12 ms
1101 = 13 ms
1110 = 14 ms
1111 = 15 ms
Reserved: Set to 0.
0
CPU Clock Stop: 0 = Normal SUSP#/ SUSPA# handshake; 1 = Full system Suspend.
Note: This register configures the CS5530 to support a 3 Volt Suspend. Setting bit 0 causes the SUSP_3V pin to assert after the
appropriate conditions, stopping the system clocks. A delay of 0 to 15 ms is programmable (bits 7:4) to allow for a delay for the
clock chip and CPU PLL to stabilize when an event Resumes the system.
A write to the CPU Suspend Command Register (F0 Index AEh) with bit 0 written as:
0 = SUSP#/SUSPA# handshake occurs. The CPU is put into a low-power state, and the system clocks are not stopped.
When a break/resume event occurs, it releases the CPU halt condition.
1 = SUSP#/SUSPA# handshake occurs and the SUSP_3V pin is asserted, thus invoking a full system Suspend (both CPU
and system clocks are stopped). When a break event occurs, the SUSP_3V pin will deassert, the PLL delay programmed in
bits [7:4] will be invoked which allows the clock chip and CPU PLL to stabilize before deasserting the SUSP# pin.
Index BDh-BFh
Reserved
Index C0h-C3h
User Defined Device 1 Base Address Register (R/W)
31:0
User Defined Device 1 (UDEF1) Base Address [31:0]: This 32-bit register supports power management (trap and idle
timer resources) for a PCMCIA slot or some other device in the system. The value written is used as the address comparator for the device trap/timer logic. The device can be memory or I/O mapped (configured in F0 Index CCh).
Index C4h-C7h
31:0
Revision 4.1
User Defined Device 2 Base Address Register (R/W)
Reset Value = 00000000h
User Defined Device 2 (UDEF2) Base Address [31:0]: This 32-bit register supports power management (trap and idle
timer resources) for a PCMCIA slot or some other device in the system. The value written is used as the address comparator for the device trap/timer logic. The device can be memory or I/O mapped (configured in F0 Index CDh).
Index C8h-CBh
31:0
Reset Value = 00000000h
User Defined Device 3 Base Address Register (R/W)
Reset Value = 00000000h
User Defined Device 3 (UDEF3) Base Address [31:0]: This 32-bit register supports power management (trap and idle
timer resources) for a PCMCIA slot or some other device in the system. The value written is used as the address comparator for the device trap/timer logic. The device can be memory or I/O mapped (configured in F0 Index CEh).
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index CCh
7
6:0
User Defined Device 1 Control Register (R/W)
Reset Value = 00h
Memory or I/O Mapped: User Defined Device 1 is: 0 = I/O; 1 = Memory.
Mask:
If bit 7 = 0 (I/O):
Bit 6
0 = Disable write cycle tracking
1 = Enable write cycle tracking
Bit 5
0 = Disable read cycle tracking
1 = Enable read cycle tracking
Bits 4:0
Mask for address bits A[4:0]
If bit 7 = 1 (M/IO):
Bits 6:0
Mask for address memory bits A[15:9] (512 bytes min. and 64 KB max.) and A[8:0] are ignored.
Note: A "1" in a mask bit means that the address bit is ignored for comparison.
Index CDh
7
6:0
User Defined Device 2 Control Register (R/W)
Reset Value = 00h
Memory or I/O Mapped: User Defined Device 2 is: 0 = I/O; 1 = Memory.
Mask:
If bit 7 = 0 (I/O):
Bit 6
0 = Disable write cycle tracking
1 = Enable write cycle tracking
Bit 5
0 = Disable read cycle tracking
1 = Enable read cycle tracking
Bits 4:0
Mask for address bits A[4:0]
If bit 7 = 1 (M/IO):
Bits 6:0
Mask for address memory bits A[15:9] (512 bytes min. and 64 KB max.) and A[8:0] are ignored.
Note: A "1" in a mask bit means that the address bit is ignored for comparison.
Index CEh
7
6:0
User Defined Device 3 Control Register (R/W)
Reset Value = 00h
Memory or I/O Mapped: User Defined Device 3 is: 0 = I/O; 1 = Memory.
Mask:
If bit 7 = 0 (I/O):
Bit 6
0 = Disable write cycle tracking
1 = Enable write cycle tracking
Bit 5
0 = Disable read cycle tracking
1 = Enable read cycle tracking
Bits 4:0
Mask for address bits A[4:0]
If bit 7 = 1 (M/IO):
Bits 6:0
Mask for address memory bits A[15:9] (512 bytes min. and 64 KB max.) and A[8:0] are ignored.
Note: A "1" in a mask bit means that the address bit is ignored for comparison.
Index CFh
Reserved
Index D0h
Software SMI Register (WO)
7:0
Software SMI (Write Only): A write to this location generates an SMI. The data written is irrelevant. This register allows
software entry into SMM via normal bus access instructions.
Index D1h-EBh
Index ECh
7:0
Reset Value = 00h
Reserved
Timer Test Register (R/W)
Reset Value = 00h
Timer Test Value: The Timer Test Register is intended only for test and debug purposes. It is not intended for setting
operational timebases.
Index EDh-F3h
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Reserved
174
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index F4h
7:5
Second Level Power Management Status Register 1 (RC)
Reset Value = 84h
Reserved
4
Game Port SMI Status (Read to Clear): SMI was caused by a R/W access to game port (I/O Port 200h and 201h)?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
Game Port Read SMI generation enabling is at F0 Index 83h[4].
Game Port Write SMI generation enabling is at F0 Index 53h[3].
3
GPIO7 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO7 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[3].
2
GPIO5 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO5 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[2].
1
GPIO4 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO4 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[1].
0
GPIO3 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO3 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 97h[0].
Note: Properly-configured means that the GPIO pin must be enabled as a GPIO, an input, and to cause an SMI.
This register provides status on various power-management SMI events. Reading this register clears the SMI status bits. A
read-only (mirror) version of this register exists at F0 Index 84h.
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index F5h
7
Second Level Power Management Status Register 2 (RC)
Reset Value = 00h
Video Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Video Idle Timer Count Register
(F0 Index A6h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[7].
6
User Defined Device 3 (UDEF3) Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the UDEF3
Idle Timer Count Register (F0 Index A4h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[6].
5
User Defined Device 2 (UDEF2) Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the UDEF2
Idle Timer Count Register (F0 Index A2h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[5].
4
User Defined Device 1 (UDEF1) Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the UDEF1
Idle Timer Count Register (F0 Index A0h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[4].
3
Keyboard/Mouse Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Keyboard/Mouse Idle
Timer Count Register (F0 Index 9Eh)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[3].
2
Parallel/Serial Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Parallel/Serial Port Idle
Timer Count Register (F0 Index 9Ch)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[2].
1
Floppy Disk Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Floppy Disk Idle Timer Count
Register (F0 Index 9Ah)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[1].
0
Primary Hard Disk Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Primary Hard Disk Idle
Timer Count Register (F0 Index 98h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 81h[0].
Note: This register provides status on the Device Idle Timers to the SMI handler. A bit set here indicates that the device was idle for
the duration configured in the Idle Timer Count register for that device, causing an SMI. Reading this register clears the SMI
status bits. A read-only (mirror) version of this register exists at F0 Index 85h. If the value of the register must be read without
clearing the SMI source (and consequently deasserting SMI), F0 Index 85h may be read instead.
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Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index F6h
7
Second Level Power Management Status Register 3 (RC)
Reset Value = 00h
Video Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the Video I/O Trap?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[7].
6
Reserved (Read Only)
5
Secondary Hard Disk Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the
secondary hard disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 83h[6].
4
Secondary Hard Disk Idle Timer SMI Status (Read to Clear): SMI was caused by expiration of the Hard Disk Idle
Timer Count Register (F0 Index ACh)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 83h[7].
3
Keyboard/Mouse Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the keyboard
or mouse? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[3].
2
Parallel/Serial Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to either the serial or
parallel ports? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[2].
1
Floppy Disk Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the
floppy disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[1].
0
Primary Hard Disk Access Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the
primary hard disk? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 82h[0].
Note: This register provides status on the Device Traps to the SMI handler. A bit set here indicates that an access occurred to the
device while the trap was enabled, causing an SMI. Reading this register clears the SMI status bits. A read-only (mirror) version of this register exists at F0 Index 86h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), F0 Index 86h may be read instead.
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-14. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)
Bit
Description
Index F7h
7
Second Level Power Management Status Register 4 (RO/RC)
Reset Value = 00h
GPIO2 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO2 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[2].
6
GPIO1 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO1 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[1].
5
GPIO0 SMI Status (Read to Clear): SMI was caused by transition on (properly-configured) GPIO0 pin?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 92h[0].
4
Lid Position (Read Only): This bit maintains the current status of the lid position. If the GPIO6 pin is configured as the lid
switch indicator, this bit reflects the state of the pin.
3
Lid Switch SMI Status (Read to Clear): SMI was caused by a transition on the GPIO6 (lid switch) pin?
0 = No; 1 = Yes.
For this to happen, the GPIO6 pin must be configured both as an input (F0 Index 90h[6] = 0) and as the lid switch (F0
Index 92h[6] =1).
2
Codec SDATA_IN SMI Status (Read to Clear): SMI was caused by an AC97 codec producing a positive edge on
SDATA_IN? 0 = No; 1 = Yes.
This is the second level of status is reporting. The top level status is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation enabling is at F0 Index 80h[5].
1
RTC Alarm (IRQ8) SMI Status (Read to Clear): SMI was caused by an RTC interrupt? 0 = No; 1 = Yes.
This SMI event can only occur while in 3V Suspend and RTC interrupt occurs.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
0
ACPI Timer SMI Status (Read to Clear): SMI was caused by an ACPI Timer MSB toggle? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[0].
SMI generation configuration is at F0 Index 83h[5].
Note: Properly-configured means that the GPIO pin must be enabled as a GPIO, an input, and to cause an SMI.
This register provides status on several miscellaneous power management events that generate SMIs, as well as the status of
the Lid Switch. Reading this register clears the SMI status bits. A read-only (mirror) version of this register exists at
F0 Index 87h.
Index F8h-FFh
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Reserved
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Revision 4.1
4.3.2 SMI Status and ACPI Timer Registers - Function 1
The register space for the SMI status and ACPI Timer registers is divided into two sections. The first section is used
to configure the PCI portion of this support hardware. A
Base Address Register at F1 Index 10h (F1BAR) points to
the base address of where the second portion of the register space is located. This second section contains the
SMI status and ACPI timer support registers.
Note:
In Silicon Revision 1.3 and above the ACPI Timer
Count Register is accessible through I/O Port
121Ch.
Table 4-15 shows the PCI header registers of F1. The
memory mapped registers accessed through F1BAR are
shown in Table 4-16.
Table 4-15. F1 Index xxh: PCI Header Registers for SMI Status and ACPI Timer
Bit
Description
Index 00h-01h
Vendor Identification Register (RO)
Reset Value = 1078h
Index 02h-03h
Device Identification Register (RO)
Reset Value = 0101h
Index 04h-05h
PCI Command Register (R/W)
Reset Value = 0000h
15:2
1
Reserved (Read Only)
Memory Space: Allow CS5530 to respond to memory cycles from the PCI bus: 0 = Disable; 1 = Enable.
This bit must be enabled to access memory offsets through F1BAR (F1 Index 10h).
0
Reserved (Read Only)
Index 06h-07h
Index 08h
PCI Status Register (RO)
Reset Value = 0280h
Device Revision ID Register (RO)
Index 09h-0Bh
PCI Class Code Register (RO)
Reset Value = 00h
Reset Value = 068000h
Index 0Ch
PCI Cache Line Size Register (RO)
Reset Value = 00h
Index 0Dh
PCI Latency Timer Register (RO)
Reset Value = 00h
Index 0Eh
PCI Header Type (RO)
Reset Value = 00h
Index 0Fh
PCI BIST Register (RO)
Reset Value = 00h
Index 10h-13h
Base Address Register — F1BAR (R/W)
Reset Value = 00000000h
This register sets the base address of the memory mapped SMI status and ACPI timer related registers. Bits [7:0] are read only (00h),
indicating a 256 byte memory address range. Refer to Table 4-16 for the SMI status and ACPI timer registers bit formats and reset values. The upper 16 bytes are always mapped to the ACPI timer, and are always memory mapped.
Note: In Silicon Revision 1.3 and above the ACPI Timer Count Register is accessible through I/O Port 121Ch.
31:8
SMI Status/Power Management Base Address
7:0
Address Range (Read Only)
Index 14h-FFh
Revision 4.1
Reserved
179
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-16. F1BAR+Memory Offset xxh: SMI Status and ACPI Timer Registers
Bit
Description
Offset 00h-01h
15
14
Top Level SMI Status Mirror Register (RO)
Reset Value = 0000h
Suspend Modulation Enable Mirror (Read Only): This bit mirrors the Suspend Mode Configuration bit (F0 Index
96h[0]). It is used by the SMI handler to determine if the SMI Speedup Disable Register (F1BAR+Memory Offset 08h)
must be cleared on exit.
SMI Source is USB (Read Only): SMI was caused by USB activity? 0 = No; 1 = Yes.
SMI generation is configured in F0 Index 42h[7:6].
13
SMI Source is Warm Reset Command (Read Only): SMI was caused by Warm Reset command? 0 = No; 1 = Yes.
12
SMI Source is NMI (Read Only): SMI was caused by NMI activity? 0 = No; 1 = Yes.
11:10
9
Reserved (Read Only): Always reads 0.
SMI Source is General Purpose Timers/User Defined Device Traps/Register Space Trap (Read Only): SMI was
caused by expiration of GP Timer 1/2; trapped access to UDEF3/2/1; trapped access to F1-F4 or ISA Legacy Register
Space? 0 = No; 1 = Yes.
The next level of status is found at F1BAR+Memory Offset 04h/06h.
8
SMI Source is Software Generated (Read Only): SMI was caused by software? 0 = No; 1 = Yes.
7
SMI on an A20M# Toggle (Read Only): SMI was caused by an access to either Port 092h or the keyboard command
which initiates an A20M# SMI? 0 = No; 1 = Yes.
This method of controlling the internal A20M# in the GXLV processor is used instead of a pin.
SMI generation enabling is at F0 Index 53h[0].
6
SMI Source is a VGA Timer Event (Read Only): SMI was caused by the expiration of the VGA Timer
(F0 Index 8Eh)? 0 = No; 1 = Yes.
SMI generation enabling is at F0 Index 83h[3].
5
SMI Source is Video Retrace (IRQ2) (Read Only): SMI was caused by a video retrace event as decoded from the serial
connection (PSERIAL register, bit 7) from the GXLV processor? 0 = No; 1 = Yes.
SMI generation enabling is at F0 Index 83h[2].
4:2
1
Reserved (Read Only): Always reads 0.
SMI Source is Audio Interface (Read Only): SMI was caused by the audio interface? 0 = No; 1 = Yes.
The next level SMI status registers is found in F3BAR+Memory Offset 10h/12h.
0
SMI Source is Power Management Event (Read Only): SMI was caused by one of the power management resources?
0 = No; 1 = Yes.
The next level of status is found at F0 Index 84h-87h/F4h-F7h.
Note: The status for the General Purpose Timers and the User Device Defined Traps are checked separately in bit 9.
Note: Reading this register does not clear the status bits. See F1BAR+Memory Offset 02h.
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Table 4-16. F1BAR+Memory Offset xxh: SMI Status and ACPI Timer Registers (Continued)
Bit
Description
Offset 02h-03h
Top Level SMI Status Register (RC)
Reset Value = 0000h
15
Suspend Modulation Enable Mirror (Read to Clear): This bit mirrors the Suspend Mode Configuration bit (F0 Index
96h[0]). It is used by the SMI handler to determine if the SMI Speedup Disable Register (F1BAR+Memory Offset 08h)
must be cleared on exit.
14
SMI Source is USB (Read to Clear): SMI was caused by USB activity? 0 = No; 1 = Yes.
SMI generation is configured in F0 Index 42h[7:6].
13
SMI Source is Warm Reset Command (Read to Clear): SMI was caused by Warm Reset command?
0 = No; 1 = Yes.
12
SMI Source is NMI (Read to Clear): SMI was caused by NMI activity? 0 = No; 1 = Yes.
11:10
9
Reserved (Read to Clear): Always reads 0.
SMI Source is General Purpose Timers/User Defined Device Traps/Register Space Trap (Read to Clear): SMI was
caused by expiration of GP Timer 1/2; trapped access to UDEF3/2/1; trapped access to F1-F4 or ISA Legacy Register
Space? 0 = No; 1 = Yes.
The next level of status is found at F1BAR+Memory Offset 04h/06h.
8
SMI Source is Software Generated (Read to Clear): SMI was caused by software? 0 = No; 1 = Yes.
7
SMI on an A20M# Toggle (Read to Clear): SMI was caused by an access to either Port 092h or the keyboard command
which initiates an A20M# SMI? 0 = No; 1 = Yes.
This method of controlling the internal A20M# in the GXLV processor is used instead of a pin.
SMI generation enabling is at F0 Index 53h[0].
6
SMI Source is a VGA Timer Event (Read to Clear): SMI was caused by the expiration of the VGA Timer
(F0 Index 8Eh)? 0 = No; 1 = Yes.
SMI generation enabling is at F0 Index 83h[3].
5
SMI Source is Video Retrace (IRQ2) (Read to Clear): SMI was caused by a video retrace event as decoded from the
from the serial connection (PSERIAL register, bit 7) from the GXLV processor? 0 = No; 1 = Yes.
SMI generation enabling is at F0 Index 83h[2].
4:2
Reserved (Read to Clear): Always reads 0.
1
SMI Source is Audio Interface (Read to Clear): SMI was caused by the audio interface? 0 = No; 1 = Yes.
The next level SMI status registers is found in F3BAR+Memory Offset 10h/12h.
0
SMI Source is Power Management Event (Read to Clear): SMI was caused by one of the power management
resources? 0 = No; 1 = Yes.
The next level of status is found at F0 Index 84h-87h/F4h-F7h.
Note: The status for the General Purpose Timers and the User Device Defined Traps are checked separately in bit 9.
Note: Reading this register clears all the SMI status bits. Note that bits 9, 1, and 0 have another level (second) of status reporting.
A read-only “Mirror” version of this register exists at F1BAR+Memory Offset 00h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), the Mirror register may be read instead.
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-16. F1BAR+Memory Offset xxh: SMI Status and ACPI Timer Registers (Continued)
Bit
Description
Offset 04h-05h
15:6
5
Second Level General Traps & Timers SMI Status Mirror Register (RO)
Reset Value = 0000h
Reserved (Read Only)
PCI Function Trap (Read Only): SMI was caused by a trapped configuration cycle (listed below)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
Trapped Access to F1 Register Space; SMI generation enabling is at F0 Index 41h[3].
Trapped Access to F2 Register Space; SMI generation enabling is at F0 Index 41h[6].
Trapped Access to F3 Register Space; SMI generation enabling is at F0 Index 42h[0].
Trapped Access to F4 Register Space; SMI generation enabling is at F0 Index 42h[1].
Trapped Access to ISA Legacy I/O Register Space; SMI generation enabling is at F0 Index 41h[0].
4
SMI Source is Trapped Access to User Defined Device 3 (Read Only): SMI was caused by a trapped I/O or memory
access to the User Defined Device 3 (F0 Index C8h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[6].
3
SMI Source is Trapped Access to User Defined Device 2 (Read Only): SMI was caused by a trapped I/O or memory
access to the User Defined Device 2 (F0 Index C4h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[5].
2
SMI Source is Trapped Access to User Defined Device 1 (Read Only): SMI was caused by a trapped I/O or memory
access to the User Defined Device 1 (F0 Index C0h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[4].
1
SMI Source is Expired General Purpose Timer 2 (Read Only): SMI was caused by the expiration of General
Purpose Timer 2 (F0 Index 8Ah)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 83h[1].
0
SMI Source is Expired General Purpose Timer 1 (Read Only): SMI was caused by the expiration of General
Purpose Timer 1 (F0 Index 88h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 83h[0].
Note: Reading this register does not clear the status bits. See F1BAR+Memory Offset 06h.
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Table 4-16. F1BAR+Memory Offset xxh: SMI Status and ACPI Timer Registers (Continued)
Bit
Description
Offset 06h-07h
15:6
Second Level General Traps & Timers SMI Status Register (RC)
Reset Value = 0000h
Reserved (Read to Clear)
5
PCI Function Trap (Read to Clear): SMI was caused by a trapped configuration cycle (listed below)?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
Trapped Access to F1 Register Space; SMI generation enabling is at F0 Index 41h[3].
Trapped Access to F2 Register Space; SMI generation enabling is at F0 Index 41h[6].
Trapped Access to F3 Register Space; SMI generation enabling is at F0 Index 42h[0].
Trapped Access to F4 Register Space; SMI generation enabling is at F0 Index 42h[1].
Trapped Access to ISA Legacy I/O Register Space; SMI generation enabling is at F0 Index 41h[0].
4
SMI Source is Trapped Access to User Defined Device 3 (Read to Clear): SMI was caused by a trapped I/O or memory access to the User Defined Device 3 (F0 Index C8h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[6].
3
SMI Source is Trapped Access to User Defined Device 2 (Read to Clear): SMI was caused by a trapped I/O or memory access to the User Defined Device 2 (F0 Index C4h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[5].
2
SMI Source is Trapped Access to User Defined Device 1 (Read to Clear): SMI was caused by a trapped I/O or memory access to the User Defined Device 1 (F0 Index C0h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 82h[4].
1
SMI Source is Expired General Purpose Timer 2 (Read to Clear): SMI was caused by the expiration of General
Purpose Timer 2 (F0 Index 8Ah)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 83h[1].
0
SMI Source is Expired General Purpose Timer 1 (Read to Clear): SMI was caused by the expiration of General
Purpose Timer 1 (F0 Index 88h)? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported in F1BAR+Memory Offset 00h/02h[9].
SMI generation enabling is at F0 Index 83h[0].
Note: Reading this register clears all the SMI status bits.
A read-only “Mirror” version of this register exists at F1BAR+Memory Offset 04h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), the Mirror register may be read instead.
Offset 08h-09h
15:0
SMI Speedup Disable Register (Read to Enable)
Reset Value = 0000h
SMI Speedup Disable: If bit 1 in the Suspend Configuration Register is set (F0 Index 96h[1] = 1), a read of this register
invokes the SMI handler to re-enable Suspend Modulation.
The data read from this register can be ignored. If the Suspend Modulation feature is disabled, reading this I/O location
has no effect.
Offset 0Ah-1Bh
Offset 1Ch-1Fh (Note)
Reserved
ACPI Timer Count Register (RO)
Reset Value = 00FFFFFCh
ACPI_COUNT (Read Only): This read-only register provides the ACPI counter. The counter counts at 14.31818/4 MHz (3.579545
MHz). If SMI generation is enabled via F0 Index 83h[5], an SMI is generated when the MSB toggles. The MSB toggles every 2.343
seconds.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported at F0 Index 87h/F7h[0].
31:24
Reserved: Always returns 0.
23:0
Counter
Note: The ACPI Timer Count Register is accessible through I/O Port 121Ch in Silicon Revision 1.3 and above.
Offset 20h-4Fh
Offset
50h-FFh
Revision 4.1
Not Used
The memory mapped registers located here (F1BAR+Memory Offset 50h-FFh) can also be accessed at F0 Index 50hFFh. The preferred method is to program these register through the F0 register space. Refer to Table 4-14 "F0 Index xxh:
PCI Header and Bridge Configuration Registers" on page 149 for bit information regarding these registers.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
4.3.3 IDE Controller Registers - Function 2
The register space for the IDE controllers is divided into
two sections. The first section is used to configure the PCI
portion of the controller. A Base Address Register at F2
Index 20h points to the base address of where the second
portion of the register space is located. This second sec-
tion contains the registers used by the IDE controllers to
carry out operations.
Table 4-17 shows the PCI header registers of F2. The I/O
mapped registers, accessed through F2BAR are shown in
Table 4-18.
Table 4-17. F2 Index xxh: PCI Header Registers for IDE Configuration
Bit
Description
Index 00h-01h
Vendor Identification Register (RO)
Reset Value = 1078h
Index 02h-03h
Device Identification Register (RO)
Reset Value = 0102h
Index 04h-05h
PCI Command Register (R/W)
Reset Value = 0000h
15:3
Reserved (Read Only)
2
Enable Mastering: 0 = Disable, 1 = Enable
1
Reserved (Read Only)
0
I/O Space: Allow CS5530 to respond to I/O cycles from the PCI bus: 0 = Disable; 1 = Enable.
This bit must be enabled to access I/O offsets through F2BAR (F2 Index 20h).
Index 06h-07h
PCI Status Register (RO)
Index 08h
Device Revision ID Register (RO)
Index 09h-0Bh
PCI Class Code Register (RO)
Reset Value = 0280h
Reset Value = 00h
Reset Value = 010180h
Index 0Ch
PCI Cache Line Size Register (RO)
Reset Value = 00h
Index 0Dh
PCI Latency Timer Register (RO)
Reset Value = 00h
Index 0Eh
PCI Header Type (RO)
Reset Value = 00h
Index 0Fh
PCI BIST Register (RO)
Reset Value = 00h
Index 10h-1Fh
Reserved
Index 20h-23h
Base Address Register - F2BAR (R/W)
Reset Value = 00000001h
This register sets the base address of the I/O mapped bus mastering IDE and controller registers. Bits [6:0] are read only (0000 001),
indicating a 128 byte I/O address range. Refer to Table 4-18 for the IDE configuration registers bit formats and reset values.
31:7
Bus Mastering IDE Base Address
6:0
Address Range (Read Only)
Index 24h-FFh
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Reserved
184
Revision 4.1
Table 4-18. F2BAR+I/O Offset xxh: IDE Configuration Registers
Bit
Description
Offset 00h
7:4
3
IDE Bus Master 0 Command Register — Primary (R/W)
Reset Value = 00h
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Sets the direction of bus master transfers: 0 = PCI reads performed;
1 = PCI writes performed.
This bit should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the bus master: 0 = Disable master; 1 = Enable master.
Bus master operations can be halted by setting bit 0 to 0. Once an operation has been halted, it can not be resumed. If bit
0 is set to 0 while a bus master operation is active, the command is aborted and the data transferred from the drive is discarded. This bit should be reset after completion of data transfer.
Offset 01h
Not Used
Offset 02h
IDE Bus Master 0 Status Register — Primary (R/W)
7
Reset Value = 00h
Simplex Mode (Read Only): Can both the primary and secondary channel operate independently?
0 = Yes; 1 = No (simplex mode)
6
Drive 1 DMA Capable: Allow Drive 1 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
5
Drive 0 DMA Capable: Allow Drive 0 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
4:3
2
Reserved: Set to 0. Must return 0 on reads.
Bus Master Interrupt: Has the bus master detected an interrupt? 0 = No; 1 = Yes.
Write 1 to clear.
1
Bus Master Error: Has the bus master detected an error during data transfer? 0 = No; 1 = Yes.
Write 1 to clear.
0
Bus Master Active (Read Only): Is the bus master active? 0 = No; 1 = Yes.
Offset 03h
Not Used
Offset 04h-07h
31:2
IDE Bus Master 0 PRD Table Address — Primary (R/W)
Reset Value = 00000000h
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for IDE Bus Master 0.
When written, this register points to the first entry in a PRD table. Once IDE Bus Master 0 is enabled (Command Register
bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Offset 08h
7:4
3
Reserved: Set to 0.
IDE Bus Master 1 Command Register — Secondary (R/W)
Reset Value = 00h
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Sets the direction of bus master transfers: 0 = PCI reads performed;
1 = PCI writes performed.
This bit should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the bus master: 0 = Disable master; 1 = Enable master.
Bus master operations can be halted by setting bit 0 = 0. Once an operation has been halted, it can not be resumed. If bit
0 is set to 0 while a bus master operation is active, the command is aborted and the data transferred from the drive is discarded. This bit should be reset after completion of data transfer.
Offset 09h
Revision 4.1
Not Used
185
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-18. F2BAR+I/O Offset xxh: IDE Configuration Registers (Continued)
Bit
Description
Offset 0Ah
7
IDE Bus Master 1 Status Register — Secondary (R/W)
Reset Value = 00h
Simplex Mode (Read Only): Can both the primary and secondary channel operate independently? 0 = Yes;
1 = No (simplex mode)
6
Drive 1 DMA Capable: Allow Drive 1 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
5
Drive 0 DMA Capable: Allow Drive 0 to be capable of DMA transfers: 0 = Disable; 1 = Enable.
4:3
2
Reserved: Set to 0. Must return 0 on reads.
Bus Master Interrupt: Has the bus master detected an interrupt? 0 = No; 1 = Yes.
Write 1 to clear.
1
Bus Master Error: Has the bus master detected an error during data transfer? 0 = No; 1 = Yes.
Write 1 to clear.
0
Bus Master Active (Read Only): Is the bus master active? 0 = No; 1 = Yes.
Offset 0Bh
Not Used
Offset 0Ch-0Fh
31:2
IDE Bus Master 1 PRD Table Address — Secondary (R/W)
Reset Value = 00000000h
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for IDE Bus Master 1.
When written, this register points to the first entry in a PRD table. Once IDE Bus Master 1 is enabled (Command Register
bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
Offset 10h-1Fh
Not Used
Offset 20h-23h
Channel 0 Drive 0 PIO Register (R/W)
Reset Value = 0000E132h (Note)
If Offset 24h[31] = 0, Format 0: Selects slowest PIOMODE per channel for commands.
Format 0 settings for: PIO Mode 0 = 00009172h
PIO Mode 1 = 00012171h
PIO Mode 2 = 00020080h
PIO Mode 3 = 00032010h
PIO Mode 4 = 00040010h
31:20
Reserved: Set to 0.
19:16
PIOMODE: PIO mode
15:12
t2I: Recovery time (value + 1 cycle)
11:8
t3: IDE_IOW# data setup time (value + 1 cycle)
7:4
t2W: IDE_IOW# width minus t3 (value + 1 cycle)
3:0
t1: Address Setup Time (value + 1 cycle)
If Offset 24h[31] = 1, Format 1: Allows independent control of command and data.
Format 1 settings for: PIO Mode 0 = 9172D132h
PIO Mode 1 = 21717121h
PIO Mode 2 = 00803020h
PIO Mode 3 = 20102010h
PIO Mode 4 = 00100010h
31:28
t2IC: Command cycle recovery time (value + 1 cycle)
27:24
t3C: Command cycle IDE_IOW# data setup (value + 1 cycle)
23:20
t2WC: Command cycle IDE_IOW# pulse width minus t3 (value + 1 cycle)
19:16
t1C: Command cycle address setup time (value + 1 cycle)
15:12
t2ID: Data cycle recovery time (value + 1 cycle)
11:8
t3D: Data cycle IDE_IOW# data setup (value + 1 cycle)
7:4
t2WD: Data cycle IDE_IOW# pulse width minus t3 (value + 1 cycle)
3:0
t1D: Data cycle address Setup Time (value + 1 cycle)
Note: The reset value of this register is not a valid PIO Mode.
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Table 4-18. F2BAR+I/O Offset xxh: IDE Configuration Registers (Continued)
Bit
Description
Offset 24h-27h
Channel 0 Drive 0 DMA Control Register (R/W)
Reset Value = 00017771h
If bit 20 = 0, Multiword DMA
Settings for: Multiword DMA Mode 0 = 00077771h
Multiword DMA Mode 1 = 00012121h
Multiword DMA Mode 2 = 00002020h
31
30:21
20
PIO Mode Format: 0 = Format 0; 1 = Format 1
Reserved: Set to 0.
DMA Select: DMA operation: 0 = Multiword DMA; 1 = Ultra DMA.
19:16
tKR: IDE_IOR# recovery time (4-bit) (value + 1 cycle)
15:12
tDR: IDE_IOR# pulse width (value + 1 cycle)
11:8
tKW: IDE_IOW# recovery time (4-bit) (value + 1 cycle)
7:4
tDW: IDE_IOW# pulse width (value + 1 cycle)
3:0
tM: IDE_CS0#/CS1# to IDE_IOR#/IOW# setup; IDE_CS0#/CS1# setup to IDE_DACK0#/DACK1#
If bit 20 = 1, Ultra DMA
Settings for: Ultra DMA Mode 0 = 00921250h
Ultra DMA Mode 1 = 00911140h
Ultra DMA Mode 2 = 00911030h
31
30:21
20
19:16
PIO Mode Format: 0 = Format 0; 1 = Format 1
Reserved: Set to 0.
DMA Select: DMA operation: 0 = Multiword DMA, 1 = Ultra DMA.
tCRC: CRC setup UDMA in IDE_DACK# (value + 1 cycle) (for host terminate CRC setup = tMLI + tSS)
15:12
tSS: UDMA out (value + 1 cycle)
11:8
tCYC: Data setup and cycle time UDMA out (value + 2 cycles)
7:4
tRP: Ready to pause time (value + 1 cycle). Note: tRFS + 1 tRP on next clock.
3:0
tACK: IDE_CS0#/CS1# setup to IDE_DACK0#/DACK1# (value + 1 cycle)
Offset 28h-2Bh
Channel 0 Drive 1 PIO Register (R/W)
Reset Value = 0000E132h
Channel 0 Drive 1 Programmed I/O Control Register: Refer to F2BAR+I/O Offset 20h for bit descriptions.
Offset 2Ch-2Fh
Channel 0 Drive 1 DMA Control Register (R/W)
Reset Value = 00017771h
Channel 0 Drive 1 MDMA/UDMA Control Register: Refer to F2BAR+I/O Offset 24h for bit descriptions.
Note: Once the PIO Mode Format is selected in F2BAR+I/O Offset 24h[31], bit 31 of this register is defined as reserved, read only.
Offset 30h-33h
Channel 1 Drive 0 PIO Register (R/W)
Reset Value = 0000E132h
Channel 1 Drive 0 Programmed I/O Control Register: Refer to F2BAR+I/O Offset 20h for bit descriptions.
Offset 34h-37h
Channel 1 Drive 0 DMA Control Register (R/W)
Reset Value = 00017771h
Channel 1 Drive 0 MDMA/UDMA Control Register: Refer to F2BAR+I/O Offset 24h for bit descriptions.
Note: Once the PIO Mode Format is selected in F2BAR+I/O Offset 24h[31], bit 31 of this register is defined as reserved, read only.
Offset 38h-3Bh
Channel 1 Drive 1 PIO Register (R/W)
Reset Value = 0000E132h
Channel 1 Drive 1 Programmed I/O Control Register: Refer to F2BAR+I/O Offset 20h for bit descriptions.
Offset 3Ch-3Fh
Channel 1 Drive 1 DMA Control Register (R/W)
Reset Value = 00017771h
Channel 1 Drive 1 MDMA/UDMA Control Register: Refer to F2BAR+I/O Offset 24h for bit descriptions.
Note: Once the PIO Mode Format is selected in F2BAR+I/O Offset 24h[31], bit 31 of this register is defined as reserved, read only.
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
4.3.4 XpressAUDIO Registers - Function 3
The register space for XpressAUDIO is divided into two
sections. The first section is used to configure the PCI
portion of the audio interface hardware. A Base Address
Register at F3 Index 10h (F3BAR) points to the base
address of where the second portion of the register space
is located. This second section contains the control and
data registers of the audio interface.
Table 4-19 shows the PCI header registers of F3. The
memory mapped registers accessed through F3BAR are
shown in Table 4-20.
Table 4-19. F3 Index xxh: PCI Header Registers for XpressAUDIO
Bit
Description
Index 00h-01h
Vendor Identification Register (RO)
Reset Value = 1078h
Index 02h-03h
Device Identification Register (RO)
Reset Value = 0103h
Index 04h-05h
PCI Command Register (R/W)
Reset Value = 0000h
15:3
Reserved (Read Only)
2
Enable Mastering: 0 = Disable, 1 = Enable
1
Memory Space: Allow CS5530 to respond to memory cycles from the PCI bus: 0 = Disable; 1 = Enable.
This bit must be enabled to access memory offsets through F3BAR (F3 Index 10h).
0
Reserved (Read Only)
Index 06h-07h
Index 08h
PCI Status Register (RO)
Device Revision ID Register (RO)
Index 09h-0Bh
PCI Class Code Register (RO)
Reset Value = 0280h
Reset Value = 00h
Reset Value = 040100h
Index 0Ch
PCI Cache Line Size Register (RO)
Reset Value = 00h
Index 0Dh
PCI Latency Timer Register (RO)
Reset Value = 00h
Index 0Eh
PCI Header Type (RO)
Reset Value =00h
Index 0Fh
PCI BIST Register (RO)
Reset Value = 00h
Index 10h-13h
Base Address Register - F3BAR (R/W)
Reset Value = 00000000h
This register sets the base address of the memory mapped audio interface control register block. This is a 128 byte block of registers
used to control the audio FIFO and codec interface, as well as to support SMIs produced by VSA technology. Bits [6:0] are read only
(0000 0000), indicating a 128 byte memory address range. Refer to Table 4-20 for the bit formats and reset values of the XpressAUDIO registers.
31:7
Audio Interface Base Address
6:0
Address Range (Read Only)
Index 14h-FFh
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Reserved
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Revision 4.1
Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers
Bit
Description
Offset 00h-03h
Codec GPIO Status Register (R/W)
31
Codec GPIO Interface: 0 = Disable; 1 = Enable.
30
Codec GPIO SMI: Allow codec GPIO interrupt to generate an SMI: 0 = Disable; 1= Enable.
Reset Value = 00000000h
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[1].
29:21
20
19:0
Reserved: Set to 0.
Codec GPIO Status Valid (Read Only): Is the status read valid? 0 = Yes; 1 = No.
Codec GPIO Pin Status (Read Only): This is the GPIO pin status that is received from the codec in slot 12 on SDATA_IN
signal.
Offset 04h-07h
Codec GPIO Control Register (R/W)
Reset Value = 00000000h
31:20
Reserved: Set to 0.
19:0
Codec GPIO Pin Data: This is the GPIO pin data that is sent to the codec in slot 12 on the SDATA_OUT signal.
Offset 08h-0Bh
31:24
23
Codec Status Register (R/W)
Reset Value = 00000000h
Codec Status Address (Read Only): Address of the register for which status is being returned. This address comes
from slot 1 bits [19:12].
Codec Serial INT SMI: Allow codec serial interrupt to generate an SMI: 0 = Disable; 1= Enable.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[1].
22
SYNC Pin: Selects SYNC pin level: 0 = Low; 1 = High.
21
Enable SDATA_IN2: Pin AE24 functions as: 0 = GPIO1; 1 = SDATA_IN2.
For this pin to function as SDATA_IN2, it must first be configured as an input (F0 Index 90h[1] = 0).
20
Audio Bus Master 5 AC97 Slot Select: Selects slot for Audio Bus Master 5 to receive data:
0 = Slot 6; 1 = Slot 11.
19
Audio Bus Master 4 AC97 Slot Select: Selects slot for Audio Bus Master 4 to transmit data:
0 = Slot 6; 1 = Slot 11.
18
Reserved: Set to 0.
17
Status Tag (Read Only): Determines if the status in bits [15:0] is new or not: 0 = Not new; 1 = New.
16
Codec Status Valid (Read Only): Is the status in bits [15:0] valid? 0 = No; 1 = Yes.
15:0
Codec Status (Read Only): This is the codec status data that is received from the codec in slot 2 on SDATA_IN. Only
bits [19:4] are used from slot 2.
Offset 0Ch-0Fh
Codec Command Register (R/W)
Reset Value = 00000000h
31:24
Codec Command Address: Address of the codec control register for which the command is being sent. This address
goes in slot 1 bits [19:12] on SDATA_OUT.
23:22
CS5530 Codec Communication: Selects which codec to communicate with:
00 = Primary codec
10 = Third codec
01 = Secondary codec
11 = Fourth codec
Note: 00 and 01 are the only valid settings for these bits.
21:17
16
Reserved: Set to 0.
Codec Command Valid: Is the command in bits [15:0] valid? 0 = No; 1 = Yes.
This bit is set by hardware when a command is loaded. It remains set until the command has been sent to the codec.
15:0
Revision 4.1
Codec Command: This is the command being sent to the codec in bits [19:12] of slot 2 on SDATA_OUT.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 10h-11h
15:8
7
Second Level Audio SMI Status Mirror Register (RC)
Reset Value = 00000000h
Reserved: Set to 0.
Audio Bus Master 5 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 5?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 5 is enabled (F3BAR+Memory Offset 48h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 49h[0] = 1).
6
Audio Bus Master 4 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 4?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 4 is enabled (F3BAR+Memory Offset 40h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 41h[0] = 1).
5
Audio Bus Master 3 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 3?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 3 is enabled (F3BAR+Memory Offset 38h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 39h[0] = 1).
4
Audio Bus Master 2 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 2?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 2 is enabled (F3BAR+Memory Offset 30h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 31h[0] = 1).
3
Audio Bus Master 1 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 1?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 1 is enabled (F3BAR+Memory Offset 28h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 29h[0] = 1).
2
Audio Bus Master 0 SMI Status (Read to Clear): SMI was caused by an event occurring on Audio Bus Master 0?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 0 is enabled (F3BAR+Memory Offset 20h[0] = 1). An SMI is then
generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 21h[0] = 1).
1
Codec Serial or GPIO Interrupt SMI Status (Read to Clear): SMI was caused by a serial or GPIO interrupt from codec?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling for codec serial interrupt: F3BAR+Memory Offset 08h[23] = 1.
SMI generation enabling for codec GPIO interrupt: F3BAR+Memory Offset 00h[30] = 1.
0
I/O Trap SMI Status (Read to Clear): SMI was caused by an I/O trap? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The next level (third level) of SMI status reporting is at F3BAR+Memory
Offset 14h. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
Note: Reading this register clears the status bits. Note that bit 0 has another level (third) of SMI status reporting.
A read-only “Mirror” version of this register exists at F3BAR+Memory Offset 00h. If the value of the register must be read without clearing the SMI source (and consequently deasserting SMI), the Mirror register may be read instead.
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Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 12h-13h
15:8
7
Second Level Audio SMI Status Register (RO)
Reset Value = 0000h
Reserved: Set to 0.
Audio Bus Master 5 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 5?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 5 is enabled (F3BAR+Memory Offset 48h[0] = 1). An SMI is then generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 49h[0] = 1).
6
Audio Bus Master 4 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 4?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 4 is enabled (F3BAR+Memory Offset 40h[0] = 1). An SMI is then generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 41h[0] = 1).
5
Audio Bus Master 3 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 3?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 3 is enabled (F3BAR+Memory Offset 38h[0] = 1). An SMI is then generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 39h[0] = 1).
4
Audio Bus Master 2 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 2?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 2 is enabled (F3BAR+Memory Offset 30h[0] = 1). An SMI is then generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 31h[0] = 1).
3
Audio Bus Master 1 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 1?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 1 is enabled (F3BAR+Memory Offset 28h[0] = 1). An SMI is then generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 29h[0] = 1).
2
Audio Bus Master 0 SMI Status (Read Only): SMI was caused by an event occurring on Audio Bus Master 0?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation is enabled when Audio Bus Master 0 is enabled (F3BAR+Memory Offset 20h[0] = 1). An SMI is then generated when the End of Page bit is set in the SMI Status Register (F3BAR+Memory Offset 21h[0] = 1).
1
Codec Serial or GPIO Interrupt SMI Status (Read Only): SMI was caused by a serial or GPIO interrupt from codec?
0 = No; 1 = Yes.
This is the second level of SMI status reporting. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling for codec serial interrupt: F3BAR+Memory Offset 08h[23] = 1.
SMI generation enabling for codec GPIO interrupt: F3BAR+Memory Offset 00h[30] = 1.
0
I/O Trap SMI Status (Read Only): SMI was caused by an I/O trap? 0 = No; 1 = Yes.
This is the second level of SMI status reporting. The next level (third level) of SMI status reporting is at F3BAR+Memory
Offset 14h. The top level is reported at F1BAR+Memory Offset 00h/02h[1].
Note: Reading this register does not clear the status bits. See F3BAR+Memory Offset 10h.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 14h-17h
I/O Trap SMI and Fast Write Status Register (RO/RC)
Reset Value = 00000000h
31:24
Fast Path Write Even Access Data (Read Only): These bits contain the data from the last Fast Path Write Even access.
These bits change only on a fast write to an even address.
23:16
Fast Path Write Odd Access Data (Read Only): These bits contain the data from the last Fast Path Write Odd access.
These bits change on a fast write to an odd address, and also on any non-fast write.
15
Fast Write A1 (Read Only): This bit contains the A1 value for the last Fast Write access.
14
Read or Write I/O Access (Read Only): Last trapped I/O access was a read or a write? 0 = Read; 1 = Write.
13
Sound Card or FM Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the Sound Card or FM
I/O Trap? 0 = No; 1 = Yes. (Note)
Fast Path Write must be enabled, F3BAR+Memory Offset 18h[11] = 1, for the SMI to be reported here. If Fast Path Write
is disabled, the SMI is reported in bit 10 of this register.
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[2].
12
DMA Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the DMA I/O Trap?
0 = No; 1 = Yes. (Note)
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[8:7].
11
MPU Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the MPU I/O Trap?
0 = No; 1 = Yes. (Note)
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[6:5].
10
Sound Card or FM Trap SMI Status (Read to Clear): SMI was caused by a trapped I/O access to the Sound Card or FM
I/O Trap? 0 = No; 1 = Yes. (Note)
Fast Path Write must be disabled, F3BAR+Memory Offset 18h[11] = 0, for the SMI to be reported here. If Fast Path Write
is enabled, the SMI is reported in bit 13 of this register.
This is the third level of SMI status reporting.
The second level of SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
The top level is reported at F1BAR+Memory Offset 00h/02h[1].
SMI generation enabling is at F3BAR+Memory Offset 18h[2].
9:0
X-Bus Address (Read Only): Bits [9:0] contain the captured ten bits of X-Bus address.
Note: For the four SMI status bits (bits [13:10]), if the activity was a fast write to an even address, no SMI is generated regardless of
the DMA, MPU, or Sound Card status. If the activity was a fast write to an odd address, an SMI is generated but bit 13 is set to
a 1.
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Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 18h-19h
15:12
11
I/O Trap SMI Enable Register (R/W)
Reset Value = 0000h
Reserved: Set to 0.
Fast Path Write Enable: Fast Path Write (an SMI is not generated on certain writes to specified addresses):
0 = Disable; 1 = Enable.
In Fast Path Write, the CS5530 responds to writes to the following addresses: 388h, 38Ah and 38B;
2x0h, 2x2h, and 2x8h.
10:9
8
Fast Read: These two bits hold part of the response that the CS5530 returns for reads to several I/O locations.
High DMA I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port C0h-DFh, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[12].
7
Low DMA I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 00h-0Fh, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[12].
6
High MPU I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 330h and 331h, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[11].
5
Low MPU I/O Trap: I0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 300h and 301h, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[11].
4
Fast Path Read Enable/SMI Disable: Read Fast Path (an SMI is not generated on reads from specified addresses):
0 = Disable; 1 = Enable.
In Fast Path Read the CS5530 responds to reads of the following addresses: 388h-38Bh; 2x0h, 2x1, 2x2h, 2x3, 2x8 and
2x9h.
Note that if neither sound card nor FM I/O mapping is enabled, then status read trapping is not possible.
3
FM I/O Trap: 0 = Disable; 1 = Enable.
If this bit is enabled and an access occurs at I/O Port 388h to 38Bh, an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
2
Sound Card I/O Trap: 0 = Disable; 1 = Enable
If this bit is enabled and an access occurs in the address ranges selected by bits [1:0], an SMI is generated.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[1].
Second level SMI status is reported at F3BAR+Memory Offset 10h/12h[0].
Third level SMI status is reported at F3BAR+Memory Offset 14h[10].
1:0
Sound Card Address Range Select: These bits select the address range for the sound card I/O trap.
00 = I/O Port 220h-22Fh
01 = I/O Port 240h-24Fh
Revision 4.1
10 = I/O Port 260h-26Fh
11 = I/O Port 280h-28Fh
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 1Ah-1Bh
Internal IRQ Enable Register (R/W)
Reset Value = 0000h
Note: Must be R/W as a WORD.
15
IRQ15 Internal: Configure IRQ15 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
14
IRQ14 Internal: Configure IRQ14 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
13
Reserved: Set to 0.
12
IRQ12 Internal: Configure IRQ12 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
11
IRQ11 Internal: Configure IRQ11 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
10
IRQ10 Internal: Configure IRQ10 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
9
IRQ9 Internal: Configure IRQ9 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
8
Reserved: Set to 0.
7
IRQ7 Internal: Configure IRQ7 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
6
Reserved: Set to 0.
5
IRQ5 Internal: Configure IRQ5 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
4
IRQ4 Internal: Configure IRQ4 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
3
IRQ3 Internal: Configure IRQ3 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.
2:0
Reserved: Set to 0.
Note: This register must be read and written as a WORD.
Offset 1Ch-1Dh
Internal IRQ Control Register (R/W)
15
Assert Masked Internal IRQ15: 0 = Disable; 1 = Enable.
14
Assert Masked Internal IRQ14: 0 = Disable; 1 = Enable.
13
Reserved: Set to 0.
12
Assert Masked Internal IRQ12: 0 = Disable; 1 = Enable.
11
Assert masked internal IRQ11: 0 = Disable; 1 = Enable.
10
Assert Masked Internal IRQ10: 0 = Disable; 1 = Enable.
9
Assert Masked Internal IRQ9: 0 = Disable; 1 = Enable.
8
Reserved: Set to 0.
7
Assert Masked Internal IRQ7: 0 = Disable; 1 = Enable.
6
Reserved: Set to 0.
5
Assert Masked Internal IRQ5: 0 = Disable; 1 = Enable.
4
Assert Masked Internal IRQ4: 0 = Disable; 1 = Enable.
3
Assert Masked Internal IRQ3: 0 = Disable; 1 = Enable.
2:0
Reserved: Set to 0.
Offset 1Eh-1Fh
Internal IRQ Mask Register (Write Only)
15
Mask Internal IRQ15: 0 = Disable; 1 = Enable.
14
Mask Internal IRQ14: 0 = Disable; 1 = Enable.
13
Reserved: Set to 0.
12
Mask Internal IRQ12: 0 = Disable; 1 = Enable.
11
Mask Internal IRQ11: 0 = Disable; 1 = Enable.
10
Mask Internal IRQ10: 0 = Disable; 1 = Enable.
9
Mask Internal IRQ9: 0 = Disable; 1 = Enable.
8
Reserved: Set to 0.
7
Mask Internal IRQ7: 0 = Disable; 1 = Enable.
6
Reserved: Set to 0.
5
Mask Internal IRQ5: 0 = Disable; 1 = Enable.
4
Mask Internal IRQ4: 0 = Disable; 1 = Enable.
3
Mask Internal IRQ3: 0 = Disable; 1 = Enable.
2:0
Reset Value = 00000000h
Reset Value = 00000000h
Reserved: Set to 0.
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Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 20h
Audio Bus Master 0 Command Register (R/W)
Reset Value = 00h
Audio Bus Master 0: Output to Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master 0: 0 = PCI reads performed;
1 = PCI writes performed.
This bit must be set to 0 (read) and should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master 0: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must either
be paused or reach EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior; including
the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
Offset 21h
Audio Bus Master 0 SMI Status Register (RC)
Reset Value = 00h
Audio Bus Master 0: Output to Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
7:4
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP before software has cleared the first?
0 = No; 1 = Yes.
If hardware encounters a second EOP (end of page) before software has cleared the first, it causes the bus master to
pause until this register is read to clear the error.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
Offset 22h-23h
Not Used
Offset 24h-27h
Audio Bus Master 0 PRD Table Address (R/W)
Reset Value = 00000000h
Audio Bus Master 0: Output to Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master 0.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 0 is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Offset 28h
Reserved: Set to 0.
Audio Bus Master 1 Command Register (R/W)
Reset Value = 00h
Audio Bus Master 1: Input from Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master 1: 0 = PCI reads performed;
1 = PCI writes performed.
This bit must be set to 1 (write) and should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master 1: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must be
either paused or reached EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior
including the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 29h
Audio Bus Master 1 SMI Status Register (RC)
Reset Value = 00h
Audio Bus Master 1: Input from Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
7:2
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP before software has cleared the first?
0 = No; 1 = Yes.
If hardware encounters a second EOP (end of page) before software has cleared the first, it causes the bus master to
pause until this register is read to clear the error.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
Offset 2Ah-2Bh
Not Used
Offset 2Ch-2Fh
Audio Bus Master 1 PRD Table Address (R/W)
Reset Value = 00000000h
Audio Bus Master 1: Input from Codec; 32-Bit; Left and Right Channels; Slots 3 and 4.
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master 1.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 1 is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
Offset 30h
Audio Bus Master 2 Command Register (R/W)
Reset Value = 00h
Audio Bus Master 2: Output to Codec; 16-Bit; Slot 5.
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master 2: 0 = PCI reads performed;
1 = PCI writes performed.
This bit must be set to 0 (read) and should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master 2: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must be
either paused or reached EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior
including the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
Offset 31h
Audio Bus Master 2 SMI Status Register (RC)
Reset Value = 00h
Audio Bus Master 2: Output to Codec; 16-Bit; Slot 5.
7:4
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP before software has cleared the first?
0 = No; 1 = Yes.
If hardware encounters a second EOP (end of page) before software has cleared the first, it causes the bus master to
pause until this register is read to clear the error.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
Offset 32h-33h
Not Used
Offset 34h-37h
Audio Bus Master 2 PRD Table Address (R/W)
Reset Value = 00000000h
Audio Bus Master 2: Output to Codec; 16-Bit; Slot 5.
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master 2.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 2 is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
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Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 38h
Audio Bus Master 3 Command Register (R/W)
Reset Value = 00h
Audio Bus Master 3: Input from Codec; 16-Bit; Slot 5.
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master 3: 0 = PCI reads performed;
1 = PCI writes performed.
This bit must be set to 1 (write) and should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master 3: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must be
either paused or reached EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior
including the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
Offset 39h
Audio Bus Master 3 SMI Status Register (RC)
Reset Value = 00h
Audio Bus Master 3: Input from Codec; 16-Bit; Slot 5.
7:4
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP before software has cleared the first?
0 = No; 1 = Yes.
If hardware encounters a second EOP (end of page) before software has cleared the first, it causes the bus master to
pause until this register is read to clear the error.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
Offset 3Ah-3Bh
Not Used
Offset 3Ch-3Fh
Audio Bus Master 3 PRD Table Address (R/W)
Reset Value = 00000000h
Audio Bus Master 3: Input from Codec; 16-Bit; Slot 5.
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master 3.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 3 is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Offset 40h
Reserved: Set to 0.
Audio Bus Master 4 Command Register (R/W)
Reset Value = 00h
Audio Bus Master 4: Output to Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[19] selects slot).
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master 4: 0 = PCI reads performed;
1 = PCI writes performed.
This bit must be set to 0 (read) and should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master 4: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must be
either paused or reached EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior
including the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-20. F3BAR+Memory Offset xxh: XpressAUDIO Configuration Registers (Continued)
Bit
Description
Offset 41h
Audio Bus Master 4 SMI Status Register (RC)
Reset Value = 00h
Audio Bus Master 4: Output to Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[19] selects slot).
7:4
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP before software has cleared the first?
0 = No; 1 = Yes.
If hardware encounters a second EOP (end of page) before software has cleared the first, it causes the bus master to
pause until this register is read to clear the error.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
Offset 42h-43h
Not Used
Offset 44h-47h
Audio Bus Master 4 PRD Table Address (R/W)
Reset Value = 00000000h
Audio Bus Master 4: Output to Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[19] selects slot).
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master 4.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 4 is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
Offset 48h
Audio Bus Master 5 Command Register (R/W)
Reset Value = 00h
Audio Bus Master 5: Input from Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[20] selects slot).
7:4
3
Reserved: Set to 0. Must return 0 on reads.
Read or Write Control: Set the transfer direction of Audio Bus Master 5: 0 = PCI reads performed;
1 = PCI writes performed.
This bit must be set to 1 (write) and should not be changed when the bus master is active.
2:1
0
Reserved: Set to 0. Must return 0 on reads.
Bus Master Control: Controls the state of the Audio Bus Master 5: 0 = Disable; 1 = Enable.
Setting this bit to 1 enables the bus master to begin data transfers. When writing this bit to 0, the bus master must be
either paused or reached EOT. Writing this bit to 0 while the bus master is operating results in unpredictable behavior
including the possibility of the bus master state machine crashing. The only recovery from this condition is a PCI reset.
Note: Must be read and written as a BYTE.
Offset 49h
Audio Bus Master 5 SMI Status Register (RC)
Reset Value = 00h
Audio Bus Master 5: Input from Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[20] selects slot).
7:4
1
Reserved (Read to Clear)
Bus Master Error (Read to Clear): Hardware encountered a second EOP before software has cleared the first?
0 = No; 1 = Yes.
If hardware encounters a second EOP (end of page) before software has cleared the first, it causes the bus master to
pause until this register is read to clear the error.
0
End of Page (Read to Clear): Bus master transferred data which is marked by EOP bit in the PRD table (bit 30)?
0 = No; 1 = Yes.
Note: Must be read and written as a BYTE.
Offset 4Ah-4Bh
Not Used
Offset 4Ch-4Fh
Audio Bus Master 5 PRD Table Address (R/W)
Reset Value = 00000000h
Audio Bus Master 5: Input from Codec; 16-Bit; Slot 6 or 11 (F3BAR+Memory Offset 08h[20] selects slot).
31:2
Pointer to the Physical Region Descriptor Table: This register is a PRD table pointer for Audio Bus Master 5.
When written, this register points to the first entry in a PRD table. Once Audio Bus Master 5 is enabled (Command Register bit 0 = 1], it loads the pointer and updates this register to the next PRD by adding 08h.
When read, this register points to the next PRD.
1:0
Reserved: Set to 0.
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Revision 4.1
4.3.5 Video Controller Registers - Function 4
The register space for the video controller is divided into
two sections. The first section is used to configure the PCI
portion of the controller. A Base Address Register at F4
Index 10h (F4BAR) points to the base address of where
the second portion of the register space is located. The
second section contains the registers used by the video
controller to carry out video operations.
Table 4-21 shows the PCI header registers of F4. The
memory mapped registers accessed through F4BAR, and
shown in Table 4-22, must be accessed using DWORD
operations. When writing to one of these 32-bit registers,
all four bytes must be written.
Table 4-21. F4 Index xxh: PCI Header Registers for Video Controller Configuration
Bit
Description
Index 00h-01h
Vendor Identification Register (RO)
Reset Value = 1078h
Index 02h-03h
Device Identification Register (RO)
Reset Value = 0104h
Index 04h-05h
PCI Command Register (R/W)
Reset Value = 0000h
15:2
1
Reserved (Read Only)
Memory Space: Allow CS5530 to respond to memory cycles from the PCI bus: 0 = Disable; 1 = Enable.
This bit must be enabled to access memory offsets through F4BAR (F4 Index 10h).
0
Reserved (Read Only)
Index 06h-07h
Index 08h
PCI Status Register (RO)
Device Revision ID Register (RO)
Index 09h-0Bh
PCI Class Code Register (RO)
Reset Value = 0280h
Reset Value = 00h
Reset Value = 030000h
Index 0Ch
PCI Cache Line Size Register (RO)
Reset Value = 00h
Index 0Dh
PCI Latency Timer Register (RO)
Reset Value = 00h
Index 0Eh
PCI Header Type (RO)
Reset Value = 00h
Index 0Fh
PCI BIST Register (RO)
Reset Value = 00h
Index 10h-13h
Base Address Register - F4BAR (R/W)
Reset Value = 00000000h
This register sets the base address of the memory mapped video controller registers. Bits [11:0] are read only (0000 0000 0000), indicating a 4 KB memory address range. Refer to Table 4-22 for the video controller register bit formats and reset values.
31:12
Video Controller and Clock Control Base I/O Address
11:0
Address Range (Read Only)
Index 14h-FFh
Revision 4.1
Reserved
199
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-22. F4BAR+Memory Offset xxh: Video Controller Configuration Registers
Bit
Description
Offset 00h-03h
Video Configuration Register (R/W)
Reset Value = 00000000h
31
Reserved: Set to 0
30
High Speed Timing for Video Interface: High speed timings for the video interface: 0 = Disable; 1= Enable.
If bit 30 is enabled, bit 25 should be set to 0.
29
16-bit Video Interface: Allow video interface to be 16 bits: 0 = Disable; 1= Enable.
If bit 29 is enabled, 8 bits of pixel data is used for video. The 24-bit pixel data is then dithered to 16 bits.
Note: F4BAR+Memory Offset 04h[25] should be set to the same value as this bit (bit 29).
28
YUV 4:2:2 or 4:2:0 Mode: 0 = 4:2:2 Mode; 1= 4:2:0 Mode.
If 4:2:0 mode is selected, bits [3:2] should be set to 01 if in 8-bit video mode and 10 if in 16-bit video mode.
Note: The GXLV processor does not support 4:2:0 mode.
27
Video Line Size (DWORDs): This is the MSB of the Video Line Size (DWORDs). See bits [15:8] for description.
26
Reserved: Set to 0
25
Early Video Ready: Generate VID_RDY output signal one-half VID_CLK period early to improve the speed of the video
port operation: 0 = Disable; 1 = Enable.
If bit 30 is enabled, this bit (bit 25) should be set to 0.
24
Initial Buffer Read Address: This is the MSB of the Initial Buffer Read Address. See bits [23:16] for description.
23:16
Initial Buffer Read Address: This field is used to preload the starting read address for the line buffers at the beginning of
each display line. It is used for hardware clipping of the video window at the left edge of the active display. It represents
the DWORD address of the source pixel which is to be displayed first. For an unclipped window, this value should be 0.
15:8
Video Line Size (DWORDs): This field represents the horizontal size of the source video data in DWORDs.
7
Y Filter Enable: Vertical filter: 0 = Disable; 1= Enable.
6
X Filter Enable: Horizontal filter: 0 = Disable; 1 = Enable.
5
CSC Bypass: Allows color-space-converter to be bypassed. Primarily used for displaying an RGB graphics overlay rather
than a YUV video overlay. 0 = Overlay data passes through CSC; 1 = Overlay data bypasses CSC.
4
GV Select: Selects whether graphics or video data will be passed through the scaler hardware:
0 = Video data; 1 = Graphics data.
3:2
Video Input Format: This field defines the byte ordering of the video data on the VID_DATA bus.
8-Bit Mode (Value Byte Order [0:3])
16-Bit Mode (Value Byte Order [0:3])
00 = U Y0 V Y1 (also used for RGB 5:6:5 input)
01 = Y1 V Y0 U or 4:2:0
10 = Y0 U Y1 V
11 = Y0 V Y1 U
00 = U Y0 V Y1 (also used for RGB 5:6:5 input)
01 = Y0 U Y1 V
10 = Y1 V Y0 U or 4:2:0
11 = Reserved
If bit 28 is enabled, these bits (bits [3:2]) should be set to 01 if in 8-bit video mode and 10 if in 16-bit video mode.
Note: U = Cb, V = Cr
1
Video Register Update: Allow video position and scale registers to be updated simultaneously on next occurrence of
vertical sync: 0 = Disable; 1 = Enable.
0
Video Enable: Video acceleration hardware: 0 = Disable; 1 = Enable.
Offset 04h-07h
Display Configuration Register (R/W)
31
DDC Input Data (Read Only): This is the DDC input data bit for reads.
30
Red Comparator (Read Only): This is the value of the red video DAC comparator.
29
Green Comparator (Read Only): This is the value of the green video DAC comparator.
Reset Value = 00000000h
28
Blue Comparator (Read Only): This is the value of the blue video DAC comparator.
27
Flat Panel On (Read Only): This bit indicates whether the attached flat panel display is powered on or off. The bit transitions at the end of the power-up or power-down sequence. 0 = Off; 1 = On.
26
DAC External Voltage Reference Enable: This bit enables the use of an external voltage reference for the video DAC.
When enabled, an external voltage reference should be connected to the EXTVREFIN pin. When disabled, the DAC internal voltage reference will be used. 0 = Disable; 1 = Enable.
25
16-Bit Graphics Enable: This bit works in conjunction with the 16-bit Video Interface bit at F4BAR+Memory Offset
00h[29]. This bit should be set to the same value as the 16-bit Video Interface bit.
24
DDC Output Enable: This bit enables the DDC_SDA line to be driven for write data. 0 = DDC_SDA pin is input;
1 = DDC_SDA pin is output.
23
DDC Output Data: This is the DDC data bit.
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Revision 4.1
Table 4-22. F4BAR+Memory Offset xxh: Video Controller Configuration Registers (Continued)
Bit
Description
22
DDC Clock: This is the DDC clock bit. It is used to clock the DDC_SDA bit.
21
Palette Bypass: Selects whether graphics or video data should bypass the gamma RAM:
0 = Video data; 1 = Graphics data.
20
Video/Graphics Color Key Select: Selects whether the video or graphics data stream will be used for color/chroma keying. 0 = Graphics data is compared to color key; 1 = Video data is compared to color key.
19:17
Power Sequence Delay: This field selects the number of frame periods that transpire between successive transitions of
the power sequence control lines. Valid values are 001h to 111h.
16:14
CRT Sync Skew: This 3-bit field represents the number of pixel clocks to skew the horizontal and vertical syncs that are
sent to the CRT. This field should be programmed to 100 as the baseline. The syncs may be moved forward or backward
relative to the pixel data via this register. It is used to compensate for the pipeline delay through the graphics pipeline.
13
Flat Panel Dither Enable: This bit enables flat panel dithering. It enables 24 bpp display data to be approximated with an
18-bit flat panel display. 0 = Disable; 1 = Enable.
12
XGA Flat Panel: This bit enables the FP_CLK_ EVEN output signal which can be used to demultiplex the FP_DATA bus
into even and odd pixels. 0 = Standard flat panel; 1 = XGA flat panel.
11
Flat Panel Vertical Synchronization Polarity: Selects the flat panel vertical sync polarity:
0 = FP vertical sync is normally low, transitioning high during sync interval.
1 = FP vertical sync is normally high, transitioning low during sync interval.
10
Flat Panel Horizontal Synchronization Polarity: Selects the flat panel horizontal sync polarity:
0 = FP horizontal sync is normally low, transitioning high during sync interval.
1 = FP horizontal sync is normally high, transitioning low during sync interval.
9
CRT Vertical Synchronization Polarity: Selects the CRT vertical sync polarity:
0 = CRT vertical sync is normally low, transitioning high during sync interval.
1 = CRT vertical sync is normally high, transitioning low during sync interval.
8
CRT Horizontal Synchronization Polarity: Selects the CRT horizontal sync polarity:
0 = CRT horizontal sync is normally low, transitioning high during sync interval.
1 = CRT horizontal sync is normally high, transitioning low during sync interval.
7
Flat Panel Data Enable: Enables the flat panel data bus:
0 = FP_DATA [17:0] is forced low;
1 = FP_DATA [17:0] is driven based upon power sequence control.
6
Flat Panel Power Enable: The transition of this bit initiates a flat panel power-up or power-down sequence:
0 -> 1 = Power-up flat panel;
1 -> 0 = Power-down flat panel.
5
DAC Power-down (active low): This bit must be set to power-up the video DACs. It can be cleared to power-down the
video DACs when not in use. 0 = DACs are powered down; 1 = DACs are powered up.
4
Reserved: Set to 0.
3
DAC Blank Enable: This bit enables the blank to the video DACs.
0 = DACs are constantly blanked; 1 = DACs are blanked normally.
2
CRT Vertical Sync Enable: Enables the CRT vertical sync. Used for VESA DPMS support. 0 = Disable; 1 = Enable.
1
CRT Horizontal Sync Enable: Enables the CRT horizontal sync. Used for VESA DPMS support.
0 = Disable; 1 = Enable.
0
Display Enable: Enables the graphics display pipeline. It is used as a reset for the display control logic.
0 = Reset display control logic; 1 = Enable display control logic
Offset 08h-0Bh
Video X Register (R/W)
Reset Value = xxxxxxxxh
31:27
Reserved: Set to 0.
26:16
Video X End Position: This field represents the horizontal end position of the video window according to the following
formula: Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13.
15:11
Reserved: Set to 0.
10:0
Video X Start Position: This field represents the horizontal start position of the video window according to the following
formula: Position programmed = screen position + (H_TOTAL – H_SYNC_END) – 13.
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-22. F4BAR+Memory Offset xxh: Video Controller Configuration Registers (Continued)
Bit
Description
Offset 0Ch-0Fh
Video Y Register (R/W)
Reset Value = xxxxxxxxh
31:27
Reserved: Set to 0.
26:16
Video Y End Position: This field represents the vertical end position of the video window according to the following formula: Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1.
15:11
Reserved: Set to 0.
10:0
Video Y Start Position: This field represents the vertical start position of the video window according to the following formula: Position programmed = screen position + (V_TOTAL – V_SYNC_END) + 1.
Offset 10h-13h
Video Scale Register (R/W)
Reset Value = xxxxxxxxh
31:30
Reserved: Set to 0.
29:16
Video Y Scale Factor: This field represents the video window vertical scale factor according to the following
formula:
VID_Y_SCL = 8192 * (Ys - 1) / (Yd - 1)
Where:
Ys = Video Source vertical size in lines
Yd = Video Destination vertical size in lines
15:14
Reserved: Set to 0.
13:0
Video X Scale Factor: This field represents the video window horizontal scale factor according to the following
formula:
VID_X_SCL = 8192 * (Xs - 1) / (Xd - 1)
Where:
Xs = Video Source horizontal size in pixels
Xd = Video Destination horizontal size in pixels
Offset 14h-17h
Video Color Key Register (R/W)
Reset Value = xxxxxxxxh
31:24
Reserved: Set to 0.
23:0
Video Color Key: This field represents the video color key. It is a 24-bit RGB value. The graphics or video data being
compared may be masked prior to the compare by programming the Video Color Mask Register (F4BAR+Memory Offset
18h) appropriately.
Offset 18h-1Bh
Video Color Mask Register (R/W)
Reset Value = xxxxxxxxh
31:24
Reserved: Set to 0.
23:0
Video Color Mask: This field represents the video color mask. It is a 24-bit RGB value. Zeroes in the mask cause the
corresponding bits in the graphics or video stream being compared to be ignored.
Offset 1Ch-1Fh
Palette Address Register (R/W)
31:8
Reserved: Set to 0.
7:0
Palette Address: The value programmed is used to initialize the palette address counter.
Offset 20h-23h
Palette Data Register (R/W)
31:24
Reserved: Set to 0.
23:0
Palette Data: This register contains the read or write data for a Gamma RAM access.
Offset 24h-27h
DOT Clock Configuration Register (R/W)
31
Reset: Reset the PLL: 0 = Normal operation; 1 = Reset
30
Half Clock: 0 = Enable; 1 = Disable.
Reset Value = xxxxxxxxh
Reset Value = xxxxxxxxh
Reset Value = 00000000h
For odd post divisors, half clock enables the falling edge of the VCO clock to be used to generate the falling edge of the
post divider output to more closely approximate a 50% output duty cycle.
29
Reserved: Set to 0.
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Revision 4.1
Table 4-22. F4BAR+Memory Offset xxh: Video Controller Configuration Registers (Continued)
Bit
28:24
Description
5-Bit DCLK PLL Post Divisor (PD) Value: Selects value of 1 to 31:
00000 = PD divisor of 8
00001 = PD divisor of 6
00010 = PD divisor of 18
00011 = PD divisor of 4
00100 = PD divisor of 12
00101 = PD divisor of 16
00110 = PD divisor of 24
00111 = PD divisor of 2
01000 = PD divisor of 10
01001 = PD divisor of 20
01010 = PD divisor of 14
01011 = PD divisor of 26
01100 = PD divisor of 22
01101 = PD divisor of 28
01110 = PD divisor of 30
01111 = PD divisor of 1*
10000 = PD divisor of 9
10001 = PD divisor of 7
10010 = PD divisor of 19
10011 = PD divisor of 5
10100 = PD divisor of 13
10101 = PD divisor of 17
10110 = PD divisor of 25
10111 = PD divisor of 3
11000 = PD divisor of 11
11001 = PD divisor of 21
11010 = PD divisor of 15
11011 = PD divisor of 27
11100 = PD divisor of 23
11101 = PD divisor of 29
11110 = PD divisor of 31
11111 = RSVD
*See bit 11 description.
23
22:12
11
Plus 1 (+1): Adds 1 or 0 to FD (DCLK PLL VCO Feedback Divisor) parameter in equation (see Note):
0 = Add 0 to FD; 1 = Add 1 to FD
N: This bit represents “N” in the equation (see Note). It is used to solve the value of FD (DCLK PLL VCO Feedback Divisor). N can be a value of 1 to 400. For all values of N, refer to Table 4-23.
CLK_ON: 0 = PLL disable; 1 = PLL enable. If PD = 1 (i.e., bits [28:24] = 01111) the PLL is always enabled.
10
DOT Clock Select: 0 = DCLK; 1 = TV_CLK.
9
Select Feedback Source: 0 = DPLL; 1 = FREF.
8
Bypass PLL: Connects the input of the PLL directly to the output of the PLL: 0 = Normal Operation; 1 = Bypass PLL.
If this bit is set to 1, the input of the PLL bypasses the PLL and resets the VCO control voltage, which in turn powers down
the PLL. Allow 0.5 ms for the control voltage to be driven to 0V.
7:6
5
Reserved: Set to 0.
PLL Lock Indictor: 0 = PLL has not locked on frequency; 1 = PLL has locked on frequency.
4:3
Reserved: Set to 0.
2:0
PLL Input Divide (ID) Value: Selects value of 2 to 9 (see Note):
000 = ID divisor of 2
001 = ID divisor of 3
010 = ID divisor of 4
011 = ID divisor of 5
Note:
100 = ID divisor of 6
101 = ID divisor of 7
110 = ID divisor of 8
111 = ID divisor of 9
To calculate DCLK output frequency:
Equation #1: DCLK = [CLK_14MHZ * FD] ÷ [PD *ID]
Condition: 140 MHz < [DCLK * PD] < 300 MHz
Where:
CLK_14MHZ is pin P24
FD is derived from N see equation #2 and #3:
PD is derived from bits [28:24]
ID is derived from bits [2:0]
Equation #2: If FD is an odd number then: FD = 2*N +1
Equation #3: If FD is an even number then: FD = 2*N +0
Where: N is derived from bits [22:12]
+1 is achieved by setting bit 23 to 1.
+0 s achieved by clearing bit 23 to 0.
Revision 4.1
203
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-22. F4BAR+Memory Offset xxh: Video Controller Configuration Registers (Continued)
Bit
Description
Offset 28h-2Bh
31:8
CRC Signature and TFT/TV Configuration Register (R/W)
Reset Value = 00000100h
24-Bit Video Signature Data (Read Only)
7
SYNC Override: Drive VSYNC_OUT on FP_VSYNC_OUT and HSYNC_OUT on FP_HSYNC_OUT:
0 = Disable; 1 = Enable.
6
Invert FP_CLK: 0 = Disable; 1 = Enable. (Applicable for TV not TFT.)
5
Invert FP_CLK_EVEN: 0 = Disable; 1 = Enable.
4:3
2
Reserved (Read Only)
Signature Free Run: 0 = Disable; 1 = Enable.
When high, with the signature enabled, the signature generator captures data continuously across multiple frames. This
bit may be set high when the signature is started, then later set low, which causes the signature generation process to
stop at the end of the current frame.
1
FP_HSYNC_OUT Delay: 0 = Disable; 1 = Enable. (Applicable for TFT not TV.)
When SYNC Override (bit 7) is high, this bit (bit 1) can be set high to delay FP_HSYNC_OUT by an extra two clock
cycles. When the SYNC Override (bit 7) is low, this bit should also be set low.
0
Signature Enable: 0 = Disable; 1= Enable.
When low the signature register is reset to 000001h and held (no capture). When high, the signature register captures the
pixel data signature with each pixel clock beginning with the next vsync.
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204
Revision 4.1
Table 4-23. F4BAR+Memory Offset 24h[22:12] Decode (Value of “N”)
N
400
399
398
397
396
395
394
393
392
391
390
389
388
387
386
385
384
383
382
381
380
379
378
377
376
375
374
373
372
371
370
369
368
367
366
365
364
363
362
361
360
359
358
357
356
355
354
353
352
351
350
Reg.
Value
N
33A
674
4E8
1D0
3A0
740
681
502
205
40B
16
2D
5B
B7
16F
2DE
5BD
37B
6F6
5EC
349
348
347
346
3D9
7B2
765
6CB
596
32D
65A
4B4
168
2D0
5A1
343
329
328
327
326
686
50C
219
433
66
CD
19B
336
66C
4D8
1B0
360
6C0
580
301
602
404
8
11
317
316
315
Revision 4.1
345
344
343
342
341
340
339
338
337
336
335
334
333
332
331
330
325
324
323
322
321
320
319
318
314
313
312
311
310
309
308
307
306
305
304
303
302
301
300
299
Reg.
Value
N
23
47
8F
11F
23E
47D
FA
1F5
3EA
7D4
7A9
753
6A7
54E
29D
53B
277
4EF
1DE
3BC
298
297
296
295
778
6F1
5E2
3C5
78A
715
62B
456
AC
159
2B2
565
278
277
276
275
2CB
597
32F
65E
4BC
178
2F0
5E1
3C3
786
70D
61B
436
6C
D9
1B3
366
6CC
598
266
265
264
294
293
292
291
290
289
288
287
286
285
284
283
282
281
280
279
274
273
272
271
270
269
268
267
263
262
261
260
259
258
257
256
255
254
253
252
251
250
249
248
Reg.
Value
N
331
662
4C4
188
310
620
440
80
101
202
405
A
15
2B
57
AF
15F
2BE
57D
2FB
247
246
245
244
5F7
3EF
7DE
7BD
77B
6F7
5EE
3DD
7BA
775
6EB
5D6
227
226
225
224
3AD
75A
6B5
56A
2D5
5AB
357
6AE
55C
2B9
573
2E7
5CF
39F
73E
67D
4FA
1F4
3E8
215
214
213
243
242
241
240
239
238
237
236
235
234
233
232
231
230
229
228
223
222
221
220
219
218
217
216
212
211
210
209
208
207
206
205
204
203
202
201
200
199
198
197
Reg.
Value
N
7D0
7A1
743
687
50E
21D
43B
76
ED
1DB
3B6
76C
6D9
5B2
365
6CA
594
329
652
4A4
196
195
194
193
148
290
521
243
487
10E
21C
439
72
E5
1CB
396
176
175
174
173
72C
659
4B2
164
2C8
591
323
646
48C
118
230
461
C2
185
30A
614
428
50
A1
164
163
162
192
191
190
189
188
187
186
185
184
183
182
181
180
179
178
177
172
171
170
169
168
167
166
165
161
160
159
158
157
156
155
154
153
152
151
150
149
148
147
146
205
Reg.
Value
N
143
286
50D
21B
437
6E
DD
1BB
376
6EC
5D8
3B1
762
6C5
58A
315
62A
454
A8
151
145
144
143
142
2A2
545
28B
517
22F
45F
BE
17D
2FA
5F5
3EB
7D6
125
124
123
122
7AD
75B
6B7
56E
2DD
5BB
377
6EE
5DC
3B9
772
6E5
5CA
395
72A
655
4AA
154
2A8
113
112
111
141
140
139
138
137
136
135
134
133
132
131
130
129
128
127
126
121
120
119
118
117
116
115
114
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
Reg.
Value
N
551
2A3
547
28F
51F
23F
47F
FE
1FD
3FA
7F4
7E9
7D3
7A7
74F
69F
53E
27D
4FB
1F6
94
93
92
91
3EC
7D8
7B1
763
6C7
58E
31D
63A
474
E8
1D1
3A2
74
73
72
71
744
689
512
225
44B
96
12D
25A
4B5
16A
2D4
5A9
353
6A6
54C
299
533
267
4CF
62
61
60
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
70
69
68
67
66
65
64
63
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
Reg.
Value
N
19E
33C
678
4F0
1E0
3C0
780
701
603
406
C
19
33
67
CF
19F
33E
67C
4F8
1F0
43
42
41
40
3E0
7C0
781
703
607
40E
1C
39
73
E7
1CF
39E
23
22
21
20
73C
679
4F2
1E4
3C8
790
721
643
486
10C
218
431
62
C5
18B
316
62C
458
B0
11
10
9
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
19
18
17
16
15
14
13
12
8
7
6
5
4
3
2
1
Reg.
Value
161
2C2
585
30B
616
42C
58
B1
163
2C6
58D
31B
636
46C
D8
1B1
362
6C4
588
311
622
444
88
111
222
445
8A
115
22A
455
AA
155
2AA
555
2AB
557
2AF
55F
2BF
57F
2FF
5FF
3FF
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
4.4
USB CONTROLLER REGISTERS - PCIUSB
The registers designated as PCIUSB are 32-bit registers
decoded from the PCI address bits 7 through 2 and
C/BE[3:0]#, when IDSEL is high, AD[10:8] select the
appropriate function, and AD[1:0] are '00'. Bytes within a
32-bit address are selected with the valid byte enables. All
registers can be accessed via 8-, 16-, or 32-bit cycles
(i.e., each byte is individually selected by the byte
enables.) Registers marked as reserved, and reserved
bits within a register are not implemented and should
return 0s when read. Writes have no effect for reserved
registers. Table 4-24 gives the bit formats for the USB
controller’s PCI configuration registers.
Table 4-24. PCIUSB Index xxh: USB Controller Registers
Bit
Description
Index 00h-01h
Vendor Identification Register (RO)
Reset Value = 0E11h
Index 02h-03h
Device Identification Register (RO)
Reset Value = A0F8h
Index 04h-05h
Command Register (R/W)
Reset Value = 0000h
15:10
Reserved: Set to 0.
9
Fast Back-to-Back Enable (Read Only): USB only acts as a master to a single device, so this functionality is not
needed. It is always disabled (must always be set to 0).
8
SERR#: USB asserts SERR# when it detects an address parity error: 0 = Disable; 1 = Enable.
7
Wait Cycle Control: USB does not need to insert a wait state between the address and data on the AD lines. It is always
disabled (bit is set to 0).
6
Parity Error: USB asserts PERR# when it is the agent receiving data and it detects a data parity error:
0 = Disable; 1 = Enable.
5
VGA Palette Snoop Enable (Read Only): USB does not support this function. It is always disabled (bit is set to 0).
4
Memory Write and Invalidate: Allow USB to run Memory Write and Invalidate commands: 0 = Disable; 1 = Enable.
The Memory Write and Invalidate Command will only occur if the cacheline size is set to 32 bytes and the memory write
is exactly one cache line.
If the CS5530 is being used in a GXLV processor based system, this bit must be set to 0.
3
Special Cycles: USB does not run special cycles on PCI. It is always disabled (bit is set to 0).
2
PCI Master Enable: Allow USB to run PCI master cycles: 0 = Disable; 1 = Enable.
1
Memory Space: Allow USB to respond as a target to memory cycles: 0 = Disable; 1 = Enable.
0
I/O Space: Allow USB to respond as a target to I/O cycles: 0 = Disable; 1 = Enable.
Index 06h-07h
Status Register (R/W)
Reset Value = 0280h
15
Detected Parity Error: This bit is set whenever the USB detects a parity error, even if the Parity Error (Response) Detection Enable Bit (Command Register, bit 6) is disabled. Write 1 to clear.
14
SERR# Status: This bit is set whenever the USB detects a PCI address error. Write 1 to clear.
13
Received Master Abort Status: This bit is set when the USB, acting as a PCI master, aborts a PCI bus memory cycle.
Write 1 to clear.
12
Received Target Abort Status: This bit is set when a USB generated PCI cycle (USB is the PCI master) is aborted by a
PCI target. Write 1 to clear.
11
Signaled Target Abort Status: This bit is set whenever the USB signals a target abort. Write 1 to clear.
10:9
DEVSEL# Timing (Read Only): These bits indicate the DEVSEL# timing when performing a positive decode. Since
DEVSEL# is asserted to meet the medium timing, these bits are encoded as 01b.
8
Data Parity Reported: Set to 1 if the Parity Error Response bit (Command Register bit 6) is set, and USB detects PERR#
asserted while acting as PCI master (whether PERR# was driven by USB or not).
7
Fast Back-to-Back Capable: USB does support fast back-to-back transactions when the transactions are not to the
same agent. This bit is always 1.
6:0
Reserved: Set to 0.
Note: The PCI Specification defines this register to record status information for PCI related events. This is a read/write register.
However, writes can only reset bits. A bit is reset whenever the register is written and the data in the corresponding bit location
is a 1.
Index 08h
Device Revision ID Register (RO)
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206
Reset Value = 00h
Revision 4.1
Table 4-24. PCIUSB Index xxh: USB Controller Registers (Continued)
Bit
Description
Index 09h-0Bh
PCI Class Code Register (RO)
Reset Value = 0C0310h
This register identifies this function as an OpenHCI device. The Base Class is 0Ch (Serial Bus Controller). The Sub Class is 03h (Universal Serial Bus). The Programming Interface is 10h (OpenHCI).
Index 0Ch
Cache Line Size Register (R/W)
Reset Value = 00h
This register identifies the system cacheline size in units of 32-bit words. USB will only store the value of bit 3 in this register since the
cacheline size of 32 bytes is the only value applicable to the design. Any value other than 08h written to this register will be read back
as 00h.
If the CS5530 is being used in a GXLV processor based system, this register must be set to 00h.
Index 0Dh
Latency Timer Register (R/W)
Reset Value = 00h
This register identifies the value of the latency timer in PCI clocks for PCI bus master cycles.
Index 0Eh
Header Type Register (RO)
Reset Value = 00h
This register identifies the type of the predefined header in the configuration space. Since USB is a single function device and not a
PCI-to-PCI bridge, this byte should be read as 00h.
Index 0Fh
BIST Register (RO)
Reset Value = 00h
This register identifies the control and status of Built In Self Test. USB does not implement BIST, so this register is read only.
Index 10h-13h
Base Address Register (R/W)
31:12
Base Address: POST writes the value of the memory base address to this register.
11:4
Always 0: Indicates a 4 KB address range is requested.
3
2:1
0
Reset Value = 00000000h
Always 0: Indicates there is no support for prefetchable memory.
Always 0: Indicates that the base register is 32-bits wide and can be placed anywhere in 32-bit memory space.
Always 0: Indicates that the operational registers are mapped into memory space.
Index 14h-3Bh
Reserved
Index 3Ch
Interrupt Line Register (R/W)
Reset Value = 00h
This register identifies which of the system interrupt controllers the devices interrupt pin is connected to. The value of this register is
used by device drivers and has no direct meaning to USB.
Index 3Dh
Interrupt Pin Register (RO)
Reset Value = 01h
This register identifies which interrupt pin a device uses. Since USB uses INTA#, this value is set to 01h.
Index 3Eh
Min. Grant Register (RO)
Reset Value = 00h
This register specifies the desired settings for how long of a burst USB needs assuming a clock rate of 33 MHz. The value specifies a
period of time in units of 1/4 microsecond.
Index 3Fh
Max. Latency Register (RO)
Reset Value = 00h
This register specifies the desired settings for how often USB needs access to the PCI bus assuming a clock rate of 33 MHz. The
value specifies a period of time in units of 1/4 microsecond.
Index 40h-43h
ASIC Test Mode Enable Register (R/W)
Reset Value = 00000000h
Used for internal debug and test purposes only.
Index 44h
7:1
0
ASIC Operational Mode Enable Register (R/W)
Write Only: Read as 0s.
Data Buffer Region 16: When set the size of the region for the data buffer is 16 bytes. Otherwise, the size is 32 bytes.
Index 45h-FFh
Revision 4.1
Reset Value = 00h
Reserved
207
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
4.5
ISA LEGACY I/O REGISTER SPACE
The bit formats for the ISA Legacy I/O Registers plus two
chipset-specific configuration registers used for interrupt
mapping in the CS5530 Core Logic are given in this section. These registers reside in the ISA I/O address space
in the address range from 000h to FFFh and are
accessed through typical input/output instructions (i.e.,
CPU direct R/W) with the designated I/O port address and
8-bit data. The registers are separated into the following
categories:
• DMA Page Registers, see Table 4-26
• Programmable Interval Timer Registers, see Table 4-27
• Programmable Interrupt Controller Registers, see Table
4-28
• Keyboard Controller Registers, see Table 4-29
• Real Time Clock Registers, see Table 4-30
• Miscellaneous Registers, see Table 4-31 (includes
4D0h and 4D1h Interrupt Edge/Level Select Registers
and ACPI Timer Count Register at I/O Port 121Ch)
• DMA Channel Control Registers, see Table 4-25
Table 4-25. DMA Channel Control Registers
Bit
Description
I/O Port 000h (R/W)
DMA Channel 0 Address Register
Written as two successive bytes, byte 0, 1.
I/O Port 001h (R/W)
DMA Channel 0 Transfer Count Register
Written as two successive bytes, byte 0, 1.
I/O Port 002h (R/W)
DMA Channel 1 Address Register
Written as two successive bytes, byte 0, 1.
I/O Port 003h (R/W)
DMA Channel 1 Transfer Count Register
Written as two successive bytes, byte 0, 1.
I/O Port 004h (R/W)
DMA Channel 2 Address Register
Written as two successive bytes, byte 0, 1.
I/O Port 005h (R/W)
DMA Channel 2 Transfer Count Register
Written as two successive bytes, byte 0, 1.
I/O Port 006h (R/W)
DMA Channel 3 Address Register
Written as two successive bytes, byte 0, 1.
I/O Port 007h (R/W)
DMA Channel 3 Transfer Count Register
Written as two successive bytes, byte 0, 1.
I/O Port 008h (R/W)
Read
DMA Status Register, Channels 3:0
7
Channel 3 Request: Request pending? 0 = No; 1 = Yes.
6
Channel 2 Request: Request pending? 0 = No; 1 = Yes.
5
Channel 1 Request: Request pending? 0 = No; 1 = Yes.
4
Channel 0 Request: Request pending? 0 = No; 1 = Yes.
3
Channel 3 Terminal Count: TC reached? 0 = No; 1 = Yes.
2
Channel 2 Terminal Count: TC reached? 0 = No; 1 = Yes.
1
Channel 1 Terminal Count: TC reached? 0 = No; 1 = Yes.
0
Channel 0 Terminal Count: TC reached? 0 = No; 1 = Yes.
Write
DMA Command Register, Channels 3:0
7
DACK Sense: 0 = Active high; 1 = Active low.
6
DREQ Sense: 0 = Active high; 1 = Active low.
5
Write Selection: 0 = Late write; 1 = Extended write.
4
Priority Mode: 0 = Fixed; 1 = Rotating.
3
Timing Mode: 0 = Normal; 1 = Compressed.
2
Channels 3:0: 0 = Disable; 1 = Enable.
1:0
Reserved: Set to 0.
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Revision 4.1
Geode™ CS5530
Register Descriptions (Continued)
Table 4-25. DMA Channel Control Registers (Continued)
Bit
Description
I/O Port 009h (WO)
7:3
2
1:0
Request Type: 0 = Reset; 1 = Set.
Channel Number Request Select: 00 = Channel 0; 01 = Channel 1; 10 = Channel 2; 11 = Channel 3.
I/O Port 00Ah (R/W)
7:3
2
1:0
DMA Channel Mask Register, Channels 3:0
Reserved: Set to 0.
Channel Mask: 0 = Not masked; 1 = Masked
Channel Number Mask Select: 00 = Channel 0; 01 = Channel 1; 10 = Channel 2; 11 = Channel 3
I/O Port 00Bh (WO)
7:6
Software DMA Request Register, Channels 3:0
Reserved: Set to 0.
DMA Channel Mode Register, Channels 3:0
Transfer Mode: 00 = Demand; 01 = Single; 10 = Block; 11 = Cascade.
5
Address Direction: 0 = Increment; 1 = Decrement.
4
Auto-initialize: 0 = Disable; 1 = Enable.
3:2
Transfer Type: 00 = Verify; 01 = Memory read; 10 = Memory write; 11 = Reserved.
1:0
Channel Number Mode Select: 00 = Channel 0; 01 = Channel 1; 10 = Channel 2; 11 = Channel 3.
I/O Port 00Ch (WO)
DMA Clear Byte Pointer Command, Channels 3:0
I/O Port 00Dh (WO)
DMA Master Clear Command, Channels 3:0
I/O Port 00Eh (WO)
DMA Clear Mask Register Command, Channels 3:0
I/O Port 00Fh (WO)
DMA Write Mask Register Command, Channels 3:0
I/O Port 0C0h (R/W)
DMA Channel 4 Address Register
Not used.
I/O Port 0C2h (R/W)
DMA Channel 4 Transfer Count Register
Not used.
I/O Port 0C4h (R/W)
DMA Channel 5 Address Register
Memory address bytes 1 and 0.
I/O Port 0C6h (R/W)
DMA Channel 5 Transfer Count Register
Transfer count bytes 1 and 0
I/O Port 0C8h (R/W)
DMA Channel 6 Address Register
Memory address bytes 1 and 0.
I/O Port 0CAh (R/W)
DMA Channel 6 Transfer Count Register
Transfer count bytes 1 and 0.
I/O Port 0CCh (R/W)
DMA Channel 7 Address Register
Memory address bytes 1 and 0.
I/O Port 0CEh (R/W)
DMA Channel 7 Transfer Count Register
Transfer count bytes 1 and 0.
Revision 4.1
209
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Geode™ CS5530
Register Descriptions (Continued)
Table 4-25. DMA Channel Control Registers (Continued)
Bit
Description
I/O Port 0D0h (R/W)
Read
DMA Status Register, Channels 7:4
7
Channel 7 Request: Request pending? 0 = No; 1 = Yes.
6
Channel 6 Request: Request pending? 0 = No; 1 = Yes.
5
Channel 5 Request: Request pending? 0 = No; 1 = Yes.
4
Undefined
3
Channel 7 Terminal Count: TC reached? 0 = No; 1 = Yes.
2
Channel 6 Terminal Count: TC reached? 0 = No; 1 = Yes.
1
Channel 5 Terminal Count: TC reached? 0 = No; 1 = Yes.
0
Undefined
Write
DMA Command Register, Channels 7:4
7
DACK Sense: 0 = Active high; 1 = Active low.
6
DREQ Sense: 0 = Active high; 1 = Active low.
5
Write Selection: 0 = Late write; 1 = Extended write.
4
Priority Mode: 0 = Fixed; 1 = Rotating.
3
Timing Mode: 0 = Normal; 1 = Compressed.
2
Channels 7:4: 0 = Disable; 1 = Enable.
1:0
Reserved: Set to 0.
I/O Port 0D2h (WO)
7:3
2
1:0
Reserved: Set to 0.
Request Type: 0 = Reset; 1 = Set.
Channel Number Request Select: 00 = Illegal; 01 = Channel 5; 10 = Channel 6; 11 = Channel 7.
I/O Port 0D4h (R/W)
7:3
2
1:0
DMA Channel Mask Register, Channels 7:0
Reserved: Set to 0.
Channel Mask: 0 = Not masked; 1 = Masked.
Channel Number Mask Select: 00 = Channel 4; 01 = Channel 5; 10 = Channel 6; 11 = Channel 7.
I/O Port 0D6h (WO)
7:6
Software DMA Request Register, Channels 7:4
DMA Channel Mode Register, Channels 7:4
Transfer Mode: 00 = Demand; 01 = Single; 10 = Block; 11 = Cascade.
5
Address Direction: 0 = Increment; 1 = Decrement.
4
Auto-initialize: 0 = Disabled; 1 = Enable.
3:2
Transfer Type: 00 = Verify; 01 = Memory read; 10 = Memory write; 11 = Reserved.
1:0
Channel Number Mode Select: 00 = Channel 4; 01 = Channel 5; 10 = Channel 6; 11 = Channel 7.
Channel 4 must be programmed in cascade mode. This mode is not the default.
I/O Port 0D8h (WO)
DMA Clear Byte Pointer Command, Channels 7:4
I/O Port 0DAh (WO)
DMA Master Clear Command, Channels 7:4
I/O Port 0DCh (WO)
DMA Clear Mask Register Command, Channels 7:4
I/O Port 0DEh (WO)
DMA Write Mask Register Command, Channels 7:4
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Revision 4.1
Geode™ CS5530
Register Descriptions (Continued)
Table 4-26. DMA Page Registers
Bit
Description
I/O Port 081h (R/W)
DMA Channel 2 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 082h (R/W)
DMA Channel 3 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 083h (R/W)
DMA Channel 1 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 087h (R/W)
DMA Channel 0 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 089h (R/W)
DMA Channel 6 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 08Ah (R/W)
DMA Channel 7 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 08Bh (R/W)
DMA Channel 5 Low Page Register
Address bits [23:16] (byte 2).
I/O Port 08Fh (R/W)
ISA Refresh Low Page Register
Refresh address.
I/O Port 481h (R/W)
DMA Channel 2 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 081h.
I/O Port 482h (R/W)
DMA Channel 3 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 082h.
I/O Port 483h (R/W)
DMA Channel 1 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 083h.
I/O Port 487h (R/W)
DMA Channel 0 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 087h.
I/O Port 489h (R/W)
DMA Channel 6 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 089h.
I/O Port 48Ah (R/W)
DMA Channel 7 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 08Ah.
I/O Port 48Bh (R/W)
DMA Channel 5 High Page Register
Address bits [31:24] (byte 3). Note: This register is reset to 00h on any access to Port 08Bh.
Revision 4.1
211
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Geode™ CS5530
Register Descriptions (Continued)
Table 4-27. Programmable Interval Timer Registers
Bit
Description
I/O Port 040h
Write
7:0
PIT Timer 0 Counter
Counter Value
Read
PIT Timer 0 Status
7
Counter Output: State of counter output signal.
6
Counter Loaded: Last count written is loaded? 0 = Yes; 1 = No.
5:4
Current Read/Write Mode: 00 = Counter latch command; 01 = R/W LSB only; 10 = R/W MSB only; 11 = R/W LSB, followed by MSB.
3:1
Current Counter Mode: 0-5.
0
BCD Mode: 0 = Binary; 1 = BCD (binary coded decimal).
I/O Port 041h
Write
7:0
PIT Timer 1 Counter (Refresh)
Counter Value
Read
PIT Timer 1 Status (Refresh)
7
Counter Output: State of counter output signal.
6
Counter Loaded: Last count written is loaded? 0 = Yes; 1 = No.
5:4
3:1
0
Current Read/Write Mode: 00 = Counter latch command; 01 = R/W LSB only; 10 = R/W MSB only; 11 = R/W LSB, followed by MSB.
Current Counter Mode: 0-5.
BCD Mode: 0 = Binary; 1 = BCD (binary coded decimal).
I/O Port 042h
Write
7:0
PIT Timer 2 Counter (Speaker)
Counter Value
Read
PIT Timer 2 Status (Speaker)
7
Counter Output: State of counter output signal.
6
Counter Loaded: Last count written is loaded? 0 = Yes; 1 = No.
5:4
3:1
0
Current Read/Write Mode: 00 = Counter latch command; 01 = R/W LSB only; 10 = R/W MSB only; 11 = R/W LSB, followed by MSB.
Current Counter Mode: 0-5.
BCD Mode: 0 = Binary; 1 = BCD (binary coded decimal).
I/O Port 043h (R/W)
PIT Mode Control Word Register
7:6
Counter Select: 00 = Counter 0; 01 = Counter 1; 10 = Counter 2; 11 = Read-back command (Note 1).
5:4
Current Read/Write Mode: 00 = Counter latch command (Note 2); 01 = R/W LSB only; 10 = R/W MSB only; 11 = R/W
LSB, followed by MSB.
3:1
0
Current Counter Mode: 0-5.
BCD Mode: 0 = Binary; 1 = BCD (binary coded decimal).
Notes: 1. If bits [7:6] = 11: Register functions as Read Status Command
Bit 5 = Latch Count, Bit 4 = Latch Status, Bit 3 = Select Counter 2, Bit 2 = Select Counter 1, Bit 0 = Select Counter 0, and
Bit 0 = Reserved
2. If bits [5:4] = 00: Register functions as Counter Latch Command
Bits [7:6] = Selects Counter, and [3:0] = Don’t care
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Revision 4.1
Geode™ CS5530
Register Descriptions (Continued)
Table 4-28. Programmable Interrupt Controller Registers
Bit
Description
I/O Port 020h / 0A0h (WO)
7:5
Reserved: Set to 0.
4
Reserved: Set to 1.
Master / Slave PIC IWC1
3
Trigger Mode: 0 = Edge; 1 = Level.
2
Vector Address Interval: 0 = 8 byte intervals; 1 = 4 byte intervals.
1
Reserved: Set to 0 (cascade mode).
0
Reserved: Set to 1 (ICW4 must be programmed).
I/O Port 021h / 0A1h (WO)
Master / Slave PIC ICW2
(after ICW1 is written)
7:3
A[7:3]: Address lines [7:3] for base vector for interrupt controller.
2:0
Reserved: Set to 0.
I/O Port 021h / 0A1h (WO)
Master / Slave PIC ICW3
(after ICW2 is written)
Master PIC ICW3
7:0
Cascade IRQ: Must be 04h.
Slave PIC ICW3
7:0
Slave ID: Must be 02h.
I/O Port 021h / 0A1h (WO)
7:5
4
3:2
Master / Slave PIC ICW4
(after ICW3 is written)
Reserved: Set to 0.
Special Fully Nested Mode: 0 = Disable; 1 = Enable.
Reserved: Set to 0.
1
Auto EOI: 0 = Normal EOI; 1 = Auto EOI.
0
Reserved: Set to 1 (8086/8088 mode).
I/O Port 021h / 0A1h (R/W)
7
Master / Slave PIC OCW1
(except immediately after ICW1 is written)
IRQ7 / IRQ15 Mask: 0 = Not Masked; 1 = Mask.
6
IRQ6 / IRQ14 Mask: 0 = Not Masked; 1 = Mask.
5
IRQ5 / IRQ13 Mask: 0 = Not Masked; 1 = Mask.
4
IRQ4 / IRQ12 Mask: 0 = Not Masked; 1 = Mask.
3
IRQ3 / IRQ11 Mask: 0 = Not Masked; 1 = Mask.
2
IRQ2 / IRQ10 Mask: 0 = Not Masked; 1 = Mask.
1
IRQ1 / IRQ9 Mask: 0 = Not Masked; 1 = Mask.
0
IRQ0 / IRQ8 Mask: 0 = Not Masked; 1 = Mask.
I/O Port 020h / 0A0h (WO)
7:5
Master / Slave PIC OCW2
Rotate/EOI Codes:
000 = Clear rotate in Auto EOI mode
001 = Non-specific EOI
010 = No operation
011 = Specific EOI (bits [2:0] must be valid)
4:3
Reserved: Set to 0.
2:0
IRQ Number (000-111)
Revision 4.1
100 = Set rotate in Auto EOI mode
101 = Rotate on non-specific EOI command
110 = Set priority command (bits [2:0] must be valid)
111 = Rotate on specific EOI command (bits [2:0] must be valid)
213
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Geode™ CS5530
Register Descriptions (Continued)
Table 4-28. Programmable Interrupt Controller Registers (Continued)
Bit
Description
I/O Port 020h / 0A0h (WO)
7
6:5
Master / Slave PIC OCW3
Reserved: Set to 0.
Special Mask Mode:
00 = No operation
01 = No operation
4
Reserved: Set to 0.
3
Reserved: Set to 1.
2
1:0
10 = Reset Special Mask Mode
11 = Set Special Mask Mode
Poll Command: 0 = Disable; 1 = Enable.
Register Read Mode:
00 = No operation
01 = No operation
I/O Port 020h / 0A0h (RO)
10 = Read interrupt request register on next read of Port 20h
11 = Read interrupt service register on next read of Port 20h.
Master / Slave PIC Interrupt Request and Service Registers
for OCW3 Commands
Interrupt Request Register
7
IRQ7 / IRQ15 Pending: 0 = Yes; 1 = No.
6
IRQ6 / IRQ14 Pending: 0 = Yes; 1 = No.
5
IRQ5 / IRQ13 Pending: 0 = Yes; 1 = No.
4
IRQ4 / IRQ12 Pending: 0 = Yes; 1 = No.
3
IRQ3 / IRQ11 Pending: 0 = Yes; 1 = No.
2
IRQ2 / IRQ10 Pending: 0 = Yes; 1 = No.
1
IRQ1 / IRQ9 Pending: 0 = Yes; 1 = No.
0
IRQ0 / IRQ8 Pending: 0 = Yes; 1 = No.
Interrupt Service Register
7
IRQ7 / IRQ15 In-Service: 0 = No; 1 = Yes.
6
IRQ6 / IRQ14 In-Service: 0 = No; 1 = Yes.
5
IRQ5 / IRQ13 In-Service: 0 = No; 1 = Yes.
4
IRQ4 / IRQ12 In-Service: 0 = No; 1 = Yes.
3
IRQ3 / IRQ11 In-Service: 0 = No; 1 = Yes.
2
IRQ2 / IRQ10 In-Service: 0 = No; 1 = Yes.
1
IRQ1 / IRQ9 In-Service: 0 = No; 1 = Yes.
0
IRQ0 / IRQ8 In-Service: 0 = No; 1 = Yes.
Note: The function of this register is set with bits [1:0] in a write to 020h.
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Table 4-29. Keyboard Controller Registers
Bit
Description
I/O Port 060h (R/W)
External Keyboard Controller Data Register
Keyboard Controller Data Register: All accesses to this port are passed to the ISA bus. If the fast keyboard gate A20 and reset features are enabled through bit 7 of the ROM/AT Logic Control Register (F0 Index 52h[7]), the respective sequences of writes to this
port assert the A20M# pin or cause a warm CPU reset.
I/O Port 061h (R/W)
7
Port B Control Register
Reset Value = 00x01100b
PERR#/SERR# Status (Read Only): Was a PCI bus error (PERR#/ SERR#) asserted by a PCI device or by CS5530?
0 = No; 1 = Yes.
This bit can only be set if ERR_EN is set 0. This bit is set 0 after a write to ERR_EN with a 1 or after reset.
6
IOCHK# Status (Read Only): Is an I/O device reporting an error to the CS5530? 0 = No; 1 = Yes.
This bit can only be set if IOCHK_EN is set 0. This bit is set 0 after a write to IOCHK_EN with a 1 or after reset.
5
PIT OUT2 State (Read Only): This bit reflects the current status of the PIT Counter 2 (OUT2).
4
Toggle (Read Only): This bit toggles on every falling edge of Counter 1 (OUT1).
3
IOCHK Enable:
0 = Generates an NMI if IOCHK# is driven low by an I/O device to report an error. Note that NMI is under SMI control.
1 = Ignores the IOCHK# input signal and does not generate NMI.
2
PERR#/ SERR# Enable: Generates an NMI if PERR#/ SERR# is driven active to report an error:
0 = Enable; 1 = Disable
1
PIT Counter2 (SPKR): 0 = Forces Counter 2 output (OUT2) to zero. 1 = Allows Counter 2 output (OUT2) to pass to the
speaker.
0
PIT Counter2 Enable: 0 = Sets GATE2 input low. 1 = Sets GATE2 input high.
I/O Port 062h (R/W)
External Keyboard Controller Mailbox Register
Keyboard Controller Mailbox Register: Accesses to this port will assert KBROMCS# if the Port 062h/066h decode is enabled
through bit 7 of the Decode Control Register 2 (F0 Index 5Bh[7]).
I/O Port 064h (R/W)
External Keyboard Controller Command Register
Keyboard Controller Command Register: All accesses to this port are passed to the ISA bus. If the fast keyboard gate A20 and
reset features are enabled through bit 7 of the ROM/AT Logic Control Register (F0 Index 52h[7]), the respective sequences of writes
to this port assert the A20M# pin or cause a warm CPU reset.
I/O Port 066h (R/W)
External Keyboard Controller Mailbox Register
Keyboard Controller Mailbox Register: Accesses to this port will assert KBROMCS# if the Port 062h/066h decode is enabled
through bit 7 of the Decode Control Register 2 (F0 Index 5Bh[7]).
I/O Port 092h
7:2
Port A Control Register (R/W)
Reset Value = 02h
Reserved: Set to 0.
1
A20M# SMI Assertion: Assert A20# SMI: 0 = Enable; 1 = Disable.
0
Fast CPU Reset: WM_RST SMI is asserted to the BIOS: 0 = Disable; 1 = Enable.
This bit must be cleared before the generation of another reset.
Table 4-30. Real-Time Clock Registers
Bit
Description
I/O Port 070h (WO)
7
6:0
RTC Address Register
NMI Mask: 0 = Enable; 1 = Mask.
RTC Register Index: A write of this register sends the data out on the ISA bus and also causes RTCALE to be triggered.
Note: This register is shadowed within the CS5530 and is read through the RTC Shadow Register (F0 Index BBh).
I/O Port 071h (R/W)
RTC Data Register
A read of this register returns the value of the register indexed by the RTC Address Register plus initiates a RTCCS#.
A write of this register sets the value into the register indexed by the RTC Address Register plus initiates a RTCCS#.
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-31. Miscellaneous Registers
Bit
Description
I/O Ports 170h-177h/376h-377h
Secondary IDE Registers (R/W)
When the local IDE functions are enabled, reads or writes to these registers cause the local IDE interface signals to operate according
to their configuration rather than generating standard ISA bus cycles.
I/O Ports 1F0h-1F7h/3F6h-3F7h
Primary IDE Registers (R/W)
When the local IDE functions are enabled, reads or writes to these registers cause the local IDE interface signals to operate according
to their configuration rather than generating standard ISA bus cycles.
I/O Port 4D0h
Interrupt Edge/Level Select Register 1 (R/W)
Reset Value = 00h
7
IRQ7 Edge or Level Select: Selects PIC IRQ7 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
6
IRQ6 Edge or Level Select: Selects PIC IRQ6 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
5
IRQ5 Edge or Level Select: Selects PIC IRQ5 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
4
IRQ4 Edge or Level Select: Selects PIC IRQ4 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
3
IRQ3 Edge or Level Select: Selects PIC IRQ3 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
2
Reserved: Set to 0.
1
IRQ1 Edge or Level Select: Selects PIC IRQ1 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
0
Reserved: Set to 0.
Notes: 1. If ICW1 - bit 3 in the PIC is set as level, it overrides this setting.
2. This bit is provided to configure a PCI interrupt mapped to IRQ[x] on the PIC as level-sensitive (shared).
I/O Port 4D1h
Interrupt Edge/Level Select Register 2 (R/W)
Reset Value = 00h
7
IRQ15 Edge or Level Select: Selects PIC IRQ15 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
6
IRQ14 Edge or Level Select: Selects PIC IRQ14 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
5
Reserved: Set to 0.
4
IRQ12 Edge or Level Select: Selects PIC IRQ12 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
3
IRQ11 Edge or Level Select: Selects PIC IRQ11 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
2
IRQ10 Edge or Level Select: Selects PIC IRQ10 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
1
IRQ9 Edge or Level Select: Selects PIC IRQ9 sensitivity configuration: 0 = Edge; 1 = Level. (Notes 1 and 2)
0
Reserved: Set to 0.
Notes: 1. If ICW1 - bit 3 in the PIC is set as level, it overrides this setting.
2. This bit is provided to configure a PCI interrupt mapped to IRQ[x] on the PIC as level-sensitive (shared).
I/O Port 121Ch-121Fh (Note)
ACPI Timer Count Register (RO)
Reset Value = 00FFFFFCh
ACPI_COUNT (Read Only): This read-only register provides the ACPI counter. The counter counts at 14.31818/4 MHz (3.579545
MHz). If SMI generation is enabled via F0 Index 83h[5], an SMI is generated when the MSB toggles. The MSB toggles every 2.343
seconds.
Top level SMI status is reported at F1BAR+Memory Offset 00h/02h[0].
Second level SMI status is reported is at F0 Index 87h/F7h[0].
31:24
Reserved: Always returns 0.
23:0
Counter
Note: The ACPI Timer Count Register is accessible through I/O Port 121Ch in Silicon Revision 1.3 and above. Otherwise read at
F1BAR+Offset 1Ch.
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4.6
V-ACPI I/O REGISTER SPACE
The register space designated as V-ACPI I/O does not
physically exist in the CS5530. ACPI is supported in the
CS5530 by virtualizing this register space, called V-ACPI.
In order for ACPI to be supported, the V-ACPI VSA module must be included in the BIOS. The register descriptions that follow, are supplied here for reference only.
P_BLK is 32-bit aligned (one register block per processor)
and contains two registers P_CNT and P_LVL2. P_LVL3
is currently not supported.
- P_CNT (Processor Control) - 16-bit register,
Controls process duty cycle via CPU clock throttling.
DUTY_WIDTH = 3 (can be widened)
DUTY_OFFSET = 0
Fixed Feature Space registers are required to be implemented by all ACPI-compatible hardware. The Fixed Feature registers in the VSA/ACPI solution are mapped to
normal I/O space starting at offset AC00h; however, the
designer can relocate this register space at compile time,
hence are hereafter referred to as ACPI_BASE. Registers
within V-ACPI (Virtualized ACPI) I/O space must only be
accessed on their defined boundaries. For example, byte
aligned registers must not be accessed via WORD I/O
instructions, WORD aligned registers must not be
accessed as DWORD I/O instructions, etc.
- P_LVL2 (Enter C2 Power State) - 8-bit, read only
register. When read, causes the processor to enter
C2 power state.
CMD_BLK contains one 8-bit register SMI_CMD which
interprets and processes the ACPI commands (defined in
Fixed ACPI Description Table, refer to ACPI Specification,
Section 5.2.5).
TST/SETUP_BLK is provided by the VSA technology
code and contains two registers, SETUP_IDX and
SETUP_DATA for the purpose of configuring the CS5530.
Specifically, this pair of registers enables system software
to map GPIO pins on the CS5530 to PM1A_STS and
GPE0_STS register bits.
The V-ACPI I/O Register Space can be broken up into
major blocks:
• PM Event Block 1A (PM1A_EVT_BLK)
• PM Event Block 1A Control (PM1A_CNT_BLK)
• Processor Register Block (P_BLK)
• Command Block (CMD_BLK)
• Test/Setup Block (TST/SETUP_BLK)
• General Purpose Enable 0 Block (GPE0_BLK)
GPE0_BLK has registers used to enable system software
to configure GPIO (General Purpose I/O) pins to generate
SCI interrupts. GPE0_BLK is a 32-bit block aligned on a
4-byte boundary. It contains two 16-bit registers,
GPE0_STS and GPE0_EN, each of which must be configured by the BIOS POST. In order for a GPE0_STS bit to
generate an SCI, the corresponding enable bit in
GPE0_EN must be set.
PM1A_EVT_BLK is 32-bit aligned and contains two 16-bit
registers, PM1A_STS and PM1A _EN.
PM1A_CNT_BLK is 32-bit aligned and contains one 16bit register, PM1A_CNT. PM1A_CNT contains the Fixed
Feature control bits used for various power management
enables and as communication flags between BIOS and
the ACPI OS.
Table 4-32 give the bit formats of the V-ACPI I/O registers.
Table 4-32. V-ACPI Registers
Bit
Description
ACPI_BASE 00h-03h
31:5
4
3
2:0
P_CNT — Processor Control Register (R/W)
Reset Value = 00000000h
Reserved: Always 0.
THT_EN: Enables throttling of the clock based on the CLK_VAL field.
Reserved: Always 0.
CLK_VAL: Clock throttling value: CPU duty cycle =
000 = Reserved
001 = 12.5%
010 = 25%
011 = 37.5%
ACPI_BASE 04h
100 = 50%
101 = 62.5%
110 = 75%
111 = 87.5%
P_LVL2 — Enter C2 Power State Register (RO)
Reset Value = 00h
Reading this 8-bit read only register causes the processor to enter the C2 power state. Reads of P_LVL2 return 0. Writes have no
effect.
ACPI_BASE 05h
Reserved
Reset Value = 00h
ACPI_BASE 06h
SMI_CMD — OS/BIOS Requests Register (R/W)
Reset Value = 00h
Interpret and process the ACPI commands (defined in Fixed ACPI Description Table, refer to ACPI Specification, Section 5.2.5):
0x01 - ACPI_ENABLE
0x02 - ACPI_DISABLE
0x03 - S4BIOS_REQ (optional)
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-32. V-ACPI Registers (Continued)
Bit
Description
ACPI_BASE 07h
ACPI_BASE 08h-09h
15
14:11
Reserved
PM1A_STS — PM1A Status Register (R/W)
Reset Value = 00h
Reset Value = 0000h
WAKE_STS: Wake Status: Set when system was in sleep state and an enabled wakeup occurs.
Reserved
10
RTC_STS: Real Time Clock Status: This bit changes to 1 if an RTC alarm causes a wake up event. This bit is only set
upon wakeup from a sleep state and IRQ8 is asserted by the RTC. Refer to Table 4-35.
9
SLPBTN_STS: Sleep Button Status (Optional): This bit changes to 1 when the sleep button is pressed. If SLPBTN_EN is
set, an SCI interrupt is generated.
This bit must be configured to be set by a GPIO pin using SETUP_IDX values 0x10-0x17 in order to be set. Refer to Table
4-34.
8
PWRBTN_STS: Power Button Status: This bit is set when power button is pressed. If PWRBTN_EN is set, an SCI interrupt is asserted.
This bit must be configured to be set by a GPIO pin using SETUP_IDX values 0x10-0x17 in order to be set. Refer to Table
4-34.
7:6
Reserved
5
GBL_STS: Global Status: The BIOS sets GBL_STS to 1 to release its global lock and return control to the ACPI OS. At
the same time GBL_STS is set, the BIOS generates an SCI.
4
BM_STS: Bus Master Status: This bit is not supported by V-ACPI.
3:1
0
Reserved
TMR_STS: ACPI Timer Status: This bit changes to 1 whenever bit 23 of the ACPI timer (F1BAR+Memory Offset 1Ch or
I/O Port 121Ch in Silicon Rev 1.3 and above) changes state. The ACPI OS is responsible for clearing TMR_STS.
If TMR_EN is also set then a SCI interrupt is asserted.
Note: Status bits are “sticky”. A write of a one (1) to a given bit location will reset the bit.
ACPI_BASE 0Ah-0Bh
15:11
PM1A_EN — PM1A Enable Register (R/W)
Reset Value = 0000h
Reserved
10
RTC_EN: Real Time Clock Enable: If set, an SCI is asserted when RTC_STS changes to 1.
9
SLPBTN_EN: Sleep Button Enable (Optional): If set, an SCI is asserted when SLPBTN_STS changes to 1.
8
PWRBTN_EN: Power Button Enable: If set, an SCI is asserted when PWRBTN_STS changes to 1.
7:6
5
4:1
0
Reserved
GBL_EN: Global Lock Enable: If set, writing a 1 to GBL_STS causes an SCI to be asserted.
Reserved
TMR_EN: ACPI Timer Enable: If set, an SCI is asserted when bit 23 of the ACPI timer (F1BAR+Memory Offset 1Ch or
I/O Port 121Ch in Silicon Rev 1.3 and above) changes state.
ACPI_BASE 0Ch-0Dh
15:14
13
12:10
PM1A_CNT — PM1A Control Register (R/W)
Reserved
SLP_EN (WO): Sleep Enable (Write Only): Setting this bit causes the system to enter the sleep state defined by
SLP_TYPx. Reads of this bit always return zero.
SLP_TYPx: Sleep Type: Defines the type of sleep state the system enters when SLP_EN is set.
000 = Sleep State S0 (Full on)
001 = Sleep State S1
010 = Sleep State S2
011 = Reserved
9:3
Reset Value = 0000h
100 = Sleep State S4
101 = Sleep State S5 (Soft off)
110 = Reserved
111 = Reserved
Reserved
2
GBL_RLS (WO): Global Lock Release (Write Only): Used by ACPI OS to raise an event to the BIOS software (SMI).
Used by ACPI driver to indicate a release of the global lock and the setting of the pending bit in the FACS table (refer to
ACPI Specification, Section 5.2.8).
1
BM_RLD: This bit is not supported by V-ACPI.
0
SCI_EN: System Controller Interrupt Enable: Selects whether power management events are SCI or SMI. Set by hardware based on an ACPI_ENABLE/ACPI_DISABLE written to the SMI_CMD port.
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Table 4-32. V-ACPI Registers (Continued)
Bit
Description
ACPI_BASE 0Eh-0Fh
SETUP_IDX — Setup Index Register (R/W)
Reset Value = 0000h
SETUP_IDX is a 16-bit register that references an internal setting in the VSA (refer to Table 4-33). A read of SETUP_IDX returns the
last value written to SETUP_IDX. A write of SETUP_IDX selects the index for a corresponding write to SETUP_DATA. Writes of any
undefined index values to SETUP_IDX are ignored. If the current value of SETUP_IDX is invalid, a read of SETUP_DATA returns 0.
ACPI_BASE 10h-11h
GPE0_STS — General Purpose Event 0 Status Register (R/W)
Reset Value = 0000h
15
OEM_GPE_S15: Original Equipment Manufacturer General Purpose Event Status Bit 15: OEM defined.
14
OEM_GPE_S14: Original Equipment Manufacturer General Purpose Event Status Bit 14: OEM defined.
13
OEM_GPE_S13: Original Equipment Manufacturer General Purpose Event Status Bit 13: OEM defined.
12
OEM_GPE_S12: Original Equipment Manufacturer General Purpose Event Status Bit 12: OEM defined.
11
OEM_GPE_S11: Original Equipment Manufacturer General Purpose Event Status Bit 11: OEM defined.
10
OEM_GPE_S10: Original Equipment Manufacturer General Purpose Event Status Bit 10: OEM defined.
9
OEM_GPE_S09: Original Equipment Manufacturer General Purpose Event Status Bit 9: OEM defined.
8
OEM_GPE_S08: Original Equipment Manufacturer General Purpose Event Status Bit 8: OEM defined.
7
OEM_GPE_S07: Original Equipment Manufacturer General Purpose Event Status Bit 7: OEM defined.
6
OEM_GPE_S06: Original Equipment Manufacturer General Purpose Event Status Bit 6: OEM defined.
The recommended mapping for the lid switch input is to use GPIO6. If the recommended mapping is used, bit 6 of
GPE0_STS needs to be mapped to GPIO6 at boot time via SETUP_IDX and SETUP_DATA. Similarly, the lid switch input
needs to be routed to GPIO6 in hardware. If this method is selected, this bit is defined as:
LID_STS: Lid Status: Set when lid state changes. If LID_EN is set, a SCI interrupt is asserted. Reset by writing a 1 to this
bit.
5
OEM_GPE_S05: Original Equipment Manufacturer General Purpose Event Status Bit 5: OEM defined.
4
OEM_GPE_S04: Original Equipment Manufacturer General Purpose Event Status Bit 4: OEM defined.
3
OEM_GPE_S03: Original Equipment Manufacturer General Purpose Event Status Bit 3: OEM defined.
2
OEM_GPE_S02: Original Equipment Manufacturer General Purpose Event Status Bit 2: OEM defined.
1
OEM_GPE_S01: Original Equipment Manufacturer General Purpose Event Status Bit 1: OEM defined.
0
OEM_GPE_S00: Original Equipment Manufacturer General Purpose Event Status Bit 0: OEM defined.
Note: Each bit is set by an external event and cleared by a write of a one to that bit. The GPE0_STS bits are mapped to specific,
chipset-resident GPIO signals using the SETUP_IDX and SETUP_DATA registers. Refer to Tables 4-33 through 4-35
Revision 4.1
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-32. V-ACPI Registers (Continued)
Bit
Description
ACPI_BASE 12h-13h
GPE0_EN — General Purpose Event 0 Enable Register (R/W)
Reset Value = 0000h
15
OEM_GPE_E15: Original Equipment Manufacturer General Purpose Event Enable Bit 15: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
14
OEM_GPE_E14: Original Equipment Manufacturer General Purpose Event Enable Bit 14: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
13
OEM_GPE_E13: Original Equipment Manufacturer General Purpose Event Enable Bit 13: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
12
OEM_GPE_E12: Original Equipment Manufacturer General Purpose Event Enable Bit 12: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
11
OEM_GPE_E11: Original Equipment Manufacturer General Purpose Event Enable Bit 11: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
10
OEM_GPE_E10: Original Equipment Manufacturer General Purpose Event Enable Bit 10: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
9
OEM_GPE_E09: Original Equipment Manufacturer General Purpose Event Enable Bit 9: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
8
OEM_GPE_E08: Original Equipment Manufacturer General Purpose Event Enable Bit 8: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
7
OEM_GPE_E07: Original Equipment Manufacturer General Purpose Event Enable Bit 7: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
6
LID_STS: Lid Enable: Enables LID_STS to generate a SCI when set.
5
OEM_GPE_E05: Original Equipment Manufacturer General Purpose Event Enable Bit 5: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
4
OEM_GPE_E04: Original Equipment Manufacturer General Purpose Event Enable Bit 4: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
3
OEM_GPE_E03: Original Equipment Manufacturer General Purpose Event Enable Bit 3: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
2
OEM_GPE_E02: Original Equipment Manufacturer General Purpose Event Enable Bit 2: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
1
OEM_GPE_E01: Original Equipment Manufacturer General Purpose Event Enable Bit 1: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
0
OEM_GPE_E00: Original Equipment Manufacturer General Purpose Event Enable Bit 0: When set, enables a SCI to be
generated when the corresponding GPE0_STS bit is set.
Note: These are the enables for the GPE0_STS bits. When set, enables a SCI to be generated when the corresponding GPE0_STS
bit is set.
ACPI_BASE 14h-17h
SETUP_DATA — Setup Data Register (R/W)
Reset Value = 00000000h
During a read operation, SETUP_DATA returns the value of the internal setting specified by the current value in SETUP_IDX
(ACPI_ABASE 0Eh-0Fh)
ACPI_BASE 18h-1Fh
Reserved
Reset Value = 00h
Reserved for future V-ACPI Implementations.
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Table 4-33. SETUP_IDX Values
Table 4-34. GPIO Mapping (0x10-0x17)
Index
Operation
0x00
No operation
0x10
Configure GPIO0 to PM1A_STS or GPE0_STS bits
xx Value
0x11
Configure GPIO1 to PM1A_STS or GPE0_STS bits
0x00
No mapping – Do not use this GPIO pin
0x12
Configure GPIO2 to PM1A_STS or GPE0_STS bits
0x08
0x13
Configure GPIO3 to PM1A_STS or GPE0_STS bits
Assign GPIOx to PWRBTN_STS bit in
PM1A_STS
0x14
Configure GPIO4 to PM1A_STS or GPE0_STS bits
0x09
Assign GPIOx to SLPBTN_STS in PM1A_STS
0x15
Configure GPIO5 to PM1A_STS or GPE0_STS bits
0x10
Assign GPIOx to bit 0 in GPE0_STS register
0x16
Configure GPIO6 to PM1A_STS or GPE0_STS bits
0x11
Assign GPIOx to bit 1 in GPE0_STS register
Configure GPIO7 to PM1A_STS or GPE0_STS bits
0x12
Assign GPIOx to bit 2 in GPE0_STS register
0x30
Configure IRQ0 to wakeup system
0x13
Assign GPIOx to bit 3 in GPE0_STS register
0x31
Configure IRQ1 to wakeup system
0x14
Assign GPIOx to bit 4 in GPE0_STS register
0x32
Do not use – Reserved for cascade interrupt
0x15
Assign GPIOx to bit 5 in GPE0_STS register
Configure IRQ3 to wakeup system
0x16
Assign GPIOx to bit 6 in GPE0_STS register
0x34
Configure IRQ4 to wakeup system
0x17
Assign GPIOx to bit 7 in GPE0_STS register
0x35
Configure IRQ5 to wakeup system
0x18
Assign GPIOx to bit 8 in GPE0_STS register
0x36
Configure IRQ6 to wakeup system
0x19
Assign GPIOx to bit 9 in GPE0_STS register
Configure IRQ7 to wakeup system
0x1A
Assign GPIOx to bit 10 in GPE0_STS register
0x38
Configure IRQ8 to wakeup system
(Defaults to RTC_STS in PM1A_STS)
0x1B
Assign GPIOx to bit 11 in GPE0_STS register
0x1C
Assign GPIOx to bit 12 in GPE0_STS register
0x39
Configure IRQ9 to wakeup system.
0x1D
Assign GPIOx to bit 13 in GPE0_STS register
0x3A
Configure IRQ10 to wakeup system.
0x1E
Assign GPIOx to bit 14 in GPE0_STS register
0x3B
Configure IRQ11 to wakeup system
0x1F
Assign GPIOx to bit 15 in GPE0_STS register
0x3C
Configure IRQ12 to wakeup system
0x3D
Do not use – Reserved for math coprocessor
0x3E
Configure IRQ14 to wakeup system
0x01
Falling edge
0x3F
Configure IRQ15 to wakeup system
0x02
Rising edge
0x40
Generate GBL_STS – Sets the GLB_STS bit and
generates a SCI to the OS
0x04
Power button
0x08
Reserved
0x17
0x33
0x37
0x41
Configure IRQ to be used for SCI
0x42
Enable reads of ACPI registers
0x43
Do atomic I/O sequence
0x50
Video power
0x60
Soft SMI AX = 6000 emulation
0x61
Soft SMI AX = 6001 emulation
0x62
Soft SMI AX = 6002 emulation
0x63
Soft SMI AX = 6003 emulation
0x64
Audio power control
Revision 4.1
SETUP_
DATA
Function
y Value (y values may be ORed together to get the desired
combination of features)
Note: For GPIO mapping, a value of 0000zyxx is used where:
z = a runtime/wake indicator
y = the edge to be used
xx = a bit in either PM1A_STS or GPE0_STS
When using V-ACPI both edges of GPIO6 can be
sensed. When using the CS5530, GPIO6 provides
additional hardware that enables the chipset to generate an SMI on both the rising and falling edges of the
input signal.
221
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Geode™ CS5530
Register Descriptions (Continued)
Geode™ CS5530
Register Descriptions (Continued)
Table 4-35. IRQ Wakeup Status Mapping
(0x30-0x3F)
SETUP_
DATA
0
Table 4-36. Commands
(0x41-0x43, and 0x50)
Function
Index
Function
0x41
Configure IRQ to be used for SCI: When mapping the SCI interrupt SETUP_IDX contains the
number of the IRQ to be used for the SCI. Valid
values are 3-7, 9-12, and 14-15. Invalid values will
not change the assignment of the SCI IRQ. The
default value for the SCI IRQ is 9.
0x42
Enable Reads of ACPI Registers: Prior to the
issuance of this command only WRITES can be
performed to the V-ACPI Fixed feature registers.
This command MUST be issued to enable reading
of the registers. This is to prevent the User Def 1
hook on NON-ACPI systems from interfering with
system functions.
0x43
Do Atomic I/O Sequence: This command allows
a sequence of I/O operations to be done with no
interruption. Certain SuperI/O chips must receive
unlock codes with NO intervening I/O. In addition
other SuperI/O chips do not allow I/O to devices
while in configuration mode. This command will
insure that I/O operations are completed without
interruption. The address of a sequence of I/O
commands is placed in the SETUP_DATA register. The command sequence will then be processed immediately.
Do not wakeup on IRQ activity.
0x0a
Assign IRQ Wake to bit 10 in PM1A_STS register
0x10
Assign IRQ Wake to bit 0 in GPE0_STS register
0x11
Assign IRQ Wake to bit 1 in GPE0_STS register
0x12
Assign IRQ Wake to bit 2 in GPE0_STS register
0x13
Assign IRQ Wake to bit 3 in GPE0_STS register
0x14
Assign IRQ Wake to bit 4 in GPE0_STS register
0x15
Assign IRQ Wake to bit 5 in GPE0_STS register
0x16
Assign IRQ Wake to bit 6 in GPE0_STS register
0x17
Assign IRQ Wake to bit 7 in GPE0_STS register
0x18
Assign IRQ Wake to bit 8 in GPE0_STS register
0x19
Assign IRQ Wake to bit 9 in GPE0_STS register
0x1A
Assign IRQ Wake to bit 10 in GPE0_STS register
0x1B
Assign IRQ Wake to bit 11 in GPE0_STS register
0x1C
Assign IRQ Wake to bit 12 in GPE0_STS register
0x1D
Assign IRQ Wake to bit 13 in GPE0_STS register
0x1E
Assign IRQ Wake to bit 14 in GPE0_STS register
0x1F
Assign IRQ Wake to bit 15 in GPE0_STS register
Note: When the ability to wakeup on an IRQ is desired use
indexes 0x31 through 0x3F. This will allow sensing of
interrupts while sleeping and waking of the system
when activity occurs. The desired GPE0 Status bit will
only be set if the system is sleeping and a wake event
occurs. The system will only wake if the status bit is
enabled in the corresponding enable register.
The I/O command sequence consists of two parts:
the signature/length block and the I/O block.
There is only one signature/length block. There
may be one or more I/O blocks.
The signature block consists of four DWORDs
(see Table 4-37).
The I/O block consists of four bytes followed by
three DWORDs (see Table 4-38).
IRQ8 (RTC) is assigned to the RTC_STS bit in the
PM1A_STS register by default and should NOT be
changed.
0x50
For enabling and selection of the GPE0 Status bit to be
set when Wake on IRQ Activity is desired, use the
SETUP_DATA values listed above.
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222
Video Power: This command will control the
power to the SOFTVGA. If SETUP_DATA is written with a 0, power will be turned off. If a 1 is written, power will be turned on.
Revision 4.1
Geode™ CS5530
Register Descriptions (Continued)
Table 4-37. Signature/Length Block for 0x43
Byte Offset
Value
0
Signature: Always 0x00000070
4
Length: The length of the entire buffer including the signature block in bytes.
8
Reserved: Set to 0
12
Reserved: Set to 0
Table 4-38. I/O Block for 0x43
Byte Offset
0
Description
BYTE: Operation Type:
1 = Read
2 = Write
3 = Read/And/Or/Write
4 = Define index and data ports
In addition, values may be OR’ed in to the upper two bits of this byte to indicate that special functions are desired:
0x80 = Do not perform this operation (convert to NO-OP).
0x40 = This is an index operation.
1
BYTE: Reserved set to 0
2
BYTE: I/O Length: Determines whether a BYTE, WORD or DWORD operation is performed.
1 = BYTE operation
2 = WORD operation
3 = DWORD operation
If BYTE 0 is a 4, then this field is used to indicate the size of the index write.
3
BYTE: Reserved set to 0
4
DWORD: I/O Address: This is the address in the I/O space to be used. It is always a WORD value. If this is a define
index/data port operation, this DWORD contains the I/O address of the index port.
If this is an index operation, other than define, this DWORD contains the value to be written to the index port.
8
DWORD: I/O Data: The meaning depends on the operation type:
Read = This is where the data read from the I/O port will be placed.
Write = This is the data to write to the I/O port.
Read/AND/OR/Write = This is the data that will be ANDed with the data read from the I/O port.
Define index/data port - This DWORD contains the I/O address of the data port.
12
DWORD: OR Data: This field is only used in a Read/AND/OR/Write operation. It contains the data that will be OR’ed
after the data read was AND’ed with the previous field. After the OR is done, the data will be re-written to the I/O port.
Note: In all cases if the data called for is shorter than the field, the data will be stored or retrieved from the least significant portion of
the DWORD.
Table 4-39. Audio Soft SMI Emulation
(0x60-0x63)
Table 4-40. Audio Power Control
(0x64)
Soft SMI AX
SETUP_IDX
SETUP_DATA
0x6000
0x60
BP register value
0x6001
0x61
BP register value
0
BX register value
1
Power codec off, do not mute (allows CD to play)
BX register value
2
Power codec on and un-mute output
3
Power codec on only
0x6002
0x6003
0x62
0x63
Data
Value
Note: Arbitrary registers cannot be set in ASL code before
issuing a soft SMI. These commands provide an I/O
interface to allow AUDIO Soft SMIs to be emulated.
Revision 4.1
Action
Power codec off and mute output
Note: This command allows control of power to the audio
codec as well as control of amplifier muting.
223
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Geode™ CS5530
5.0
Electrical Specifications
This section provides information on testing modes, electrical connections, absolute maximum ratings, recommended operating conditions, and DC/AC characteristics
for the Geode CS5530. All voltage values in Electrical
Specifications are with respect to VSS unless otherwise
noted.
For detailed information on the PCI bus electrical specification refer to Chapter 4 of the PCI Bus Specification,
Revision 2.1.
5.1
TEST MODES
The CS5530 can be forced into different test modes. Table
5-1 summarizes the test mode selection process.
Table 5-1. Test Mode Selection
Signal Name
Mode
POR#
TEST
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
Test mode: X_CLK is a direct clock, stays until
POR# event
0
1
0
0
1
0
0
Test USB pads
x
1
0
1
0
0
0
NAND tree test, IDDQ test, tristate control: PLL,
USB pads, and DAC are all in power-down mode
(see Section 5.1.1 “Nand Tree Mode” on page 225)
x
1
x
x
x
x
1
PLL test
x
1
1
0
0
0
0
X-Bus test: Allows internal X-Bus to be driven
externally
0
1
1
0
1
0
x
BIST for palette and video RAMs
x
1
1
1
0
0
0
DAC test
x
1
1
1
1
0
0
IRQ6 = 1 as well; USB test
x
1
0
0
0
1
0
SCAN_MODE = 1, SCAN_ENABLE = 0,
TEST_CLOCK = PAD_DCC_SDA
x
1
1
0
0
1
0
SCAN_MODE = 1, SCAN_ENABLE = 1,
TEST_CLOCK = PAD_DCC_SDA,
X-BUS_DISABLE = 1
x
1
1
0
1
1
0
Note:
x = Don’t Care
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224
Revision 4.1
5.1.1 Nand Tree Mode
The NAND tree mode is used to test input and bidirectional pins which will be part of the NAND tree chain. The
NAND tree chain starts on pin L24 (SUSP_3V) and the
output of the chain is on pin K24 (POR#). Table 5-2 gives
the pins of the NAND tree chain.
The NAND tree mode is started by pulling pins D3 (TEST)
and AD14 (IRQ7) from low to high. All inputs in Table 5-2
are initialized to a 1 and then toggled to a 0 at least 100 ns
apart. The output waveform on pin K24 (POR#) is a clock
(see Figure 5-1 on page 226).
Table 5-2. NAND Tree Test Mode Pins
Signal Name
Pin No.
Signal Name
Pin No.
Signal Name
Pin No.
SUSP_3V (NAND Input Start)
L24
SA8/SD8
AF19
FP_DATA14/SA14
K1
SUSPA#
L25
DRQ0
AE18
FP_DATA2/SA2
J3
PSERIAL
L26
IRQ11
AF18
FP_DATA1/SA1
J2
CLK_14MHZ
P24
IRQ14
AC17
FP_DATA3/SA3
J1
SMI#
P25
IRQ15
AD17
FP_DATA15/SA15
H2
INTR
P26
SBHE#
AE17
FP_DATA16/SA_OE#
H3
IRQ13
R23
IRQ12
AF17
FP_DATA4//SA4
H1
XIDE_DATA7
U23
IRQ10
AE16
FP_DATA8//SA8
G1
XIDE_DATA6
U24
IOCS16#
AF16
FP_DATA5/SA5
G2
XIDE_DATA8
V24
MEMCS16#
AC15
FP_DATA7//SA7
G3
XIDE_DATA10
V25
IRQ4
AE15
FP_DATA6/SA6
G4
XIDE_DATA5
W26
TC
AF15
FP_DATA9//SA9
F1
XIDE_DATA9
Y25
IRQ3
AC14
FP_DATA17/MASTER#
F3
XIDE_DATA11
Y24
IRQ8#
AE14
FP_DATA10//SA10
E2
XIDE_DATA4
AA26
IRQ6
AF14
FP_DATA11/SA11
D1
XIDE_DATA12
AA25
DRQ3
AD13
FP_VSYNC
C1
XIDE_DATA3
AB26
IRQ5
AE13
FP_HSYNC
C2
XIDE_DATA1
AA24
IRQ1
AF13
ENA_DISP
B1
XIDE_DATA13
AB25
DRQ1
AD12
TVCLK
B2
XIDE_DATA2
AB24
IORX0
AE12
PIXEL0
A1
XIDE_DATA0
AC26
SA17
AF12
PIXEL3
C4
XIDE_DATA14
AC25
IOW#
AC11
PIXEL6
D5
XIDE_DATA15
AB23
SA16
AD11
PIXEL4
B3
IDE_DREQ1
AC24
SA18
AE11
PIXEL1
A2
IDE_DREQ0
AD26
IOCHRDY
AF11
PIXEL2
A3
IDE_IORDY0
AD25
SA19
AD10
PIXEL11
C5
IDE_IORDY1
AE26
DRQ2
AE10
PIXEL9
D6
SA14/SD14
AD24
ZEROWS#
AF10
PIXEL5
B4
SA15/SD15
AE25
SA2/SD2
AD9
PIXEL7
A4
GPIO0
AC22
SA0/SD0
AE9
HSYNC
C6
GPIO1/SDATA_IN2
AE24
SA4/SD4
AF6
VSYNC
B5
GPIO2
AF25
SA1/SD1
AE6
PIXEL13
D7
GPIO3
AF24
SA6/SD6
AF5
PIXEL14
C7
GPIO4/SA20
AD22
SA3/SD3
AC6
PIXEL10
A5
GPIO5/SA21
AC21
IRQ9
AE5
PIXEL8
B6
GPIO6/SA22
AE23
SA5/SD5
AD5
VID_CLK
A6
GPIO7/SA23
AF23
SA7/SD7
AF4
PIXEL17
C8
SA13/SD13
AE22
CLK_32K
AE3
VID_VAL
B7
SA10/SD10
AC20
OVER_CUR#
W3
PIXEL12
A7
DRQ7
AF22
POWER_EN
V4
PIXEL15
B8
SA12/SD12
AE21
USBCLK
W1
PIXEL20
D9
SA11/SD11
AF21
BIT_CLK
V2
PIXEL21
C9
SA9/SD9
AD19
SDATA_IN
U4
PIXEL16
A8
DRQ6
AE20
DDC_SDA
M4
PIXEL18
B9
MEMW#
AF20
FP_DATA12/SA12
L1
PIXEL19
A9
MEMR#
AE19
FP_DATA0/SA0
K3
PIXEL23
C10
DRQ5
AD18
FP_DATA13/SA13
K2
VID_DATA4
D11
Revision 4.1
225
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Geode™ CS5530
Electrical Specifications (Continued)
Geode™ CS5530
Electrical Specifications (Continued)
Table 5-1.
Signal Name
Pin No.
Test Mode Selection (Continued)
Signal Name
Pin No.
Signal Name
Pin No.
VID_DATA3
C11
AD9
A17
AD16
A26
PIXEL22
B11
AD8
D18
GNT#
D24
VID_DATA0
A11
C/BE0#
B18
AD21
C25
VID_DATA7
C12
AD12
A18
AD19
B26
VID_DATA6
B12
AD11
B19
AD22
C26
VID_DATA5
A12
AD10
A19
AD20
E24
VID_DATA1
C13
AD15
A20
AD26
D25
VID_DATA2
B13
AD14
B20
C/BE3#
D26
PCLK
A13
AD13
C20
AD23
E25
AD1
D14
PAR
A21
AD25
G24
INTD#
B14
C/BE1#
B21
STOP#
E26
INTA#
A14
SERR#
A22
AD24
F25
INTB#
D15
PERR#
B22
AD27
F26
INTC#
C15
LOCK#
C22
AD28
G25
AD3
B15
DEVSEL#
A23
AD29
G26
AD0
A15
TRDY#
B23
AD31
H25
AD2
C16
FRAME#
C23
AD30
J24
AD5
B16
C/BE2#
A24
HOLD_REQ#
H26
AD7
A16
IRDY#
B24
REQ#
J25
AD4
C17
AD17
A25
PCICLK
J26
AD6
B17
AD18
B25
POR# (NAND Output)
K24
POR#
100 ns
TEST
IRQ7
SUSP_3V
SUSPA#
PSERIAL
:::
:::
:::
PCICLK
Figure 5-1. NAND Tree Output Waveform
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226
Revision 4.1
5.2
ELECTRICAL CONNECTIONS
resistor and active-low inputs to VDD through a 20-kohm
(±10%) pull-up resistor.
5.2.1 Pull-Up Resistors
Table 5-3 lists the pins that are internally connected to a 20kohm pull-up resistor. When unused, these inputs do not
require connection to an external pull-up resistor.
5.2.3 NC-Designated Pins
Pins designated NC should be left disconnected. Connecting an NC pin to a pull-up resistor, pull-down resistor,
or an active signal could cause unexpected results and
possible circuit malfunctions.
Table 5-3. Pins with Weak Internal Resistor
Signal
Name
Type
Ball No.
Internal
PU
IOR#
I/O
AE12
PU
IOW#
I/O
AC11
PU
MEMR#
I/O
AE19
PU
MEMW#
I/O
AF20
PU
SBHE#
I/O
AE17
PU
SA[19:0]/
SD[19:0]
I/O
AD10, AE11,
AF12, AD11,
AE25, AD24,
AD22, AE21,
AF21, AC20,
AD19, AF19,
AF4, AF5, AD5,
AF6, AC6,
AD9, AE6, AD9
PU
5.2.4 Power/Ground Connections and Decoupling
Testing and operating the CS5530 requires the use of
standard high frequency techniques to reduce parasitic
effects. These effects can be minimized by filtering the DC
power leads with low-inductance decoupling capacitors,
using low-impedance wiring, and by using all of the VDD
and VSS pins.
5.3
ABSOLUTE MAXIMUM RATINGS
Table 5-4 lists absolute maximum ratings for the CS5530.
Stresses beyond the listed ratings may cause permanent
damage to the device. Exposure to conditions beyond
these limits may (1) reduce device reliability and (2) result
in premature failure even when there is no immediately
apparent sign of failure. Prolonged exposure to conditions
at or near the absolute maximum ratings may also result
in reduced useful life and reliability These are stress ratings only and do not imply that operation under any conditions other than those listed under Table 5-5 is possible.
5.2.2 Unused Input Pins
All inputs not used by the system designer and not listed
in Table 5-3 should be kept at either VSS or VDD. To prevent possible spurious operation, connect active-high
inputs to ground through a 20-kohm (±10%) pull-down
5.4
RECOMMENDED OPERATING
CONDITIONS
Table 5-5 lists the recommended operating conditions for
the CS5530.
Table 5-4. Absolute Maximum Ratings
Parameter
Min
Max
Units
110
°C
Power Applied
150
°C
No Bias
4.0
V
Operating Case Temperature
Storage Temperature
–65
Supply Voltage
Comments
Voltage On Any Pin
–0.5
5.5
V
Input Clamp Current, IIK
–0.5
10
mA
Power Applied
25
mA
Power Applied
Output Clamp Current, IOK
Table 5-5. Recommended Operating Conditions
Symbol
Parameter
TC
Operating Case Temperature
VDD
Supply Voltage
Note:
Revision 4.1
Min
Max
Units
0
85
°C
3.0
3.6
V
Comments
For video interface specific parameters, refer to Table 5-15 "Video Interface: Setup/Hold and Delay Times" on
page 235.
227
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Geode™ CS5530
Electrical Specifications (Continued)
Geode™ CS5530
Electrical Specifications (Continued)
5.5
DC CHARACTERISTICS
Table 5-6. DC Characteristics (at Recommended Operating Conditions)
Symbol
Parameter
VIL
Low Level Input Voltage
VIH
Units
V
0.8
PCI
–0.5
0.3VCC
2.0
1.1VDD
Comments
High Level Input Voltage
PCI
IIL
Max
–0.3
5V tolerant
VOH
Typ
All inputs except PCI
All inputs except 5V tolerant and
PCI
VOL
Min
2.0
5.5
0.5VCC
VCC+0.5
V
Low Level Output Voltage
V
IOL = 4 mA, Note 1
4 mA
0.4
8 mA
0.4
IOL = 8 mA, Note 1
16 mA
0.4
IOL = 16 mA, Note 1
PCI
0.4
USB
0.3
RL = 15 KΩ to VDD,
Note 1
High Level Output Voltage
4 mA
2.4
V
8 mA
2.4
IOH = –8 mA, Note 1
16 mA
2.4
IOH = –16 mA, Note 1
PCI
VCC–0.5
USB
2.8
3.6
All inputs except those with
internal PUs
–10
10
Inputs with internal PUs
–200
–10
–10
10
IOH = –4 mA, Note 1
RL = 15 KΩ to VDD,
Note 1
Low Level Input Leakage Current
µA
VIN = VSS,
See Table 5-3
µA
VIN = VDD
V
Note 1
IIH
High Level Input Leakage Current
VH
Schmitt (smt) Trigger Hysteresis
Voltage
VDI
USB - Differential Input Sensitivity
V
|(D+)-(D-)|
VCM
USB - Differential Common Mode
Range
0.8
2.5
V
Includes VDI range
VSE
USB - Single Ended Receiver
Threshold
0.8
2.0
V
CIN
Input Capacitance
10
pF
f = 1 MHz
COUT
Output or I/O Capacitance
10
pF
f = 1 MHz
CCLK
CLK Input Capacitance
10
pF
f = 1 MHz
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0.5
0.2
228
Revision 4.1
Table 5-6. DC Characteristics (at Recommended Operating Conditions) (Continued)
Symbol
Parameter
Min
Typ
Max
Units
Comments
250
mA
Note 2
Core
ICC_CORE
Active ICC: PCICLK @ 33MHz
180
ICCSM_CORE
Suspend Mode ICC
135
mA
Note 2
ICCSS_CORE
Standby ICC (Suspended and CLK
Stopped)
20
mA
fPCICLK = 0 MHz,
Note 2
60
mA
Min is ICC inactive,
Note 2
5
mA
Note 2
DAC
ICC_DAC
Active ICC
<0.3
PLL
ICC_PLL
Active ICC
Notes: 1. Pins with this buffer type are listed alphabetically in Table 2-3 "352 TBGA Pin Assignments - Sorted Alphabetically by Signal Name" on page 18.
2. Not 100% tested.
Revision 4.1
229
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Geode™ CS5530
Electrical Specifications (Continued)
Geode™ CS5530
Electrical Specifications (Continued)
5.6
AC CHARACTERISTICS
The following tables list the AC characteristics including
output delays, input setup requirements, input hold
requirements and output float delays. The rising-clockedge reference level, VREF, and other reference levels are
shown in Table 5-7. Input or output signals must cross
these levels during testing.
All AC tests are at VDD = 3.0V to 3.6V, TC = 0oC to
85oC, CL = 50 pF unless otherwise specified.
Note:
Table 5-7. Drive Level and Measurement Points
for Switching Characteristics
Input setup and hold times are specified minimums that
define the smallest acceptable sampling window for which
a synchronous input signal must be stable for correct operation.
Symbol
Voltage (V)
VREF
1.5
VIHD
2.3
VILD
0.3
TX
CLK
VIHD
VREF
VILD
A
B
OUTPUTS
Max
Min
Valid Output n+1
Valid Output n
C
INPUTS
VIHD
VREF
D
VREF
Valid Input
VILD
Legend: A = Maximum Output Delay Specification
B = Minimum Output Delay Specification
C = Minimum Input Setup Specification
D = Minimum Input Hold Specification
Figure 5-2. Drive Level and Measurement Points for Switching Characteristics
Table 5-8. AC Characteristics of Specification Compliant Interface Signals
Note:
Interface Signal Group
Specification Name
IDE Interface Signals
ATA-4 Specification
USB Interface Signals
USB Specification, Version 1.0
PCI Bus Interface Signals
PCI Bus Specification, Revision 2.1
ISA Bus Interface Signals
Abides industry standards
The interface signal groups listed in Table 5-8 adhere to the timing parameters given in the corresponding
specification. For details, refer to those specifications.
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230
Revision 4.1
Geode™ CS5530
Electrical Specifications (Continued)
Table 5-9. Clock Characteristics
Parameter
Min
Max
Duty
Cycle
Unit
Comments
tf, tLcyc, tHcyc
DCLK Frequency
25
157.5
30/70
MHz
Notes 1 through 5
tLcyc, tHcyc
CLK_32K Frequency
32.768
50/50
kHz
Notes 6 and 7
tLcyc, tHcyc
CLK_14MHZ Frequency
14.31818
45/55
MHz
Symbol
Output Signals
Input Signal
∞
tcyc
PCICLK Cycle Time
30
tHIGH
PCICLK High Time
11
ns
tLOW
PCICLK Low Time
11
ns
--
PCICLK Slew Time
1
4
ns
V/ns
Note 8
Notes: 1. Worst case duty cycle.
2. Duty cycle is a function of PLL post divider.
3. Programmable to standard video frequencies.
4. Typical jitter < 650 ps peak-to-peak.
5. CLK_14MHZ input jitter < 500 ps peak-to-peak.
6. CLK_32K jitter = period of CLK_14MHZ
7. CLK_32K output frequency = CLK_14MHZ/436.95621.
8. Rise and fall times are specified in terms of the edge rate measured in V/ns. This slew rate must be met
across the minimum peak-to-peak portion of the clock waveform as shown in Figure 5-3.
tcyc
tHIGH
0.6 VCC
tLOW
0.5 VCC
0.4 VCC
0.4 VCC, peak-to-peak
(minimum)
0.3 VCC
0.2 VCC
Figure 5-3. 3.3V PCICLK Waveform
Revision 4.1
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Geode™ CS5530
Electrical Specifications (Continued)
Table 5-10. CPU Interface Timings
Symbol
Parameter
Min
Max
Unit
tSMI
Comments
Rising PCICLK to SMI#
3
9
ns
tSUSP#
Rising PCICLK to SUSP#
6
9
ns
tSUSPAsetup
SUSPA# setup to rising PCICLK
0
ns
tSUSPAhold
SUSPA# hold from rising PCICLK
1
ns
--
IRQ13 Input
Asynchronous input for IRQ decode.
--
INTR Output
Asynchronous output from IRQ decode.
--
SMI# Output
Asynchronous output from SMI decode.
PCICLK
tSMI
SMI#
tSUSP
SUSP#
tSUSPAhold
tSUSPAsetup
Valid Input
SUSPA#
Figure 5-4. CPU Interface Timing
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Revision 4.1
Table 5-11. Audio Interface Timings
Symbol
Parameter
Min
Max
Unit
tBITCLK
Rising BIT_CLK to SYNC
5
16
ns
tSDAT
Rising BIT_CLK to SDATA_OUT
5
17
ns
tSDATsetup
SDATA_IN setup to falling BIT_CLK
15
ns
tSDAThold
SDATA_IN hold from falling BIT_CLK
5
ns
Comments
BIT_CLK
tBITCLK
SYNC
tSDAT
tSDAThold
SDATA_OUT
tSDATsetup
Valid Input
SDATA_IN
Figure 5-5. Audio Interface Timing
Revision 4.1
233
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Geode™ CS5530
Electrical Specifications (Continued)
Geode™ CS5530
Electrical Specifications (Continued)
5.7
VIDEO CHARACTERISTICS
•
•
•
•
The following tables and figures describe the DC/AC characteristics of the CS5530 video interface. It is divided into
the following categories:
Recommended Operating Conditions
Miscellaneous Operating Characteristics
Analog Output Rise/Settle Times
Setup/Hold and Delay Times
Additionally, Figure 5-8 is provided showing a typical
video connection diagram.
Table 5-12. Video Interface: Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Units
AVDD
Power Supply connected to
AVDD1, AVDD2 and AVDD3
3.0
3.3
3.6
V
RL
Output Load on each of the pins
IOUTR, IOUTG and IOUTB
IOUT
Output Current on each of the
pins IOUTR, IOUTG and IOUTB
RSET
Value of the full-scale adjust
resistor connected to IREF
VEXTREF
IREF
37.5
Comments
Ohms
21
mA
732
Ohms
External voltage reference connected to the EXTVREFIN pin
1.235
V
Current flow through the resistor
connected to the IREF pin
2.2
mA
This resistor should have a
1% tolerance.
Table 5-13. Video Interface: Miscellaneous Operating Characteristics
Symbol
Parameter
White Level Relative to Black
IAVDD
Min
Typ
Max
Units
16.74
17.62
18.50
mA
EXTVREFIN Leakage Current
2
µA
AVDD Supply Current
60
mA
Comments
Table 5-14. Video Interface: Analog Output Rise/Settle Times
Symbol
Parameter
Min
Typ
Max
Units
Comments
trise
Analog Output Rise Time
2
ns
Notes 1 and 2
tsettle
Analog Output Settling Time
4
ns
Notes 1 and 3
Notes: 1. Timing measurements are made with a 75 ohm doubly-terminated load, with VEXTREF = 1.235V and
RSET = 732 ohms.
2. 10% to 90% of full-scale transition.
3. Full-scale transition: time from output minimum to maximum, not including clock and data feedthrough.
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Revision 4.1
Table 5-15. Video Interface: Setup/Hold and Delay Times
Symbol
Parameter
Min
Display setup to rising PCLK:
3.0
Typ
Max
Units
Comments
Setup/Hold Times
tDisplaySetup
ns
VSYNC, HSYNC, FP_DISP_ENA,
FP_VSYNC, FP_HSYNC, PIXEL[23:0]
Display hold from rising PCLK:
tDisplayHold
0
All setup/hold
times are
derived as
shown in
Figure 5-2.
VSYNC, HSYNC, FP_DISP_ENA,
FP_VSYNC, FP_HSYNC, PIXEL[23:0]
tVID_VALSetup
VID_VAL setup to rising VID_CLK
3.75
ns
tVID_VALHold
VID_VAL hold from rising VID_CLK
0
ns
tVID_DATASetup
VID_DATA setup to rising VID_CLK
3.75
ns
tVID_DATAHold
VID_DATA hold from rising VID_CLK
0
ns
FPOUTMinDelay,
FPOUTMaxDelay
TFT/TV output delays from FP_CLK:
0.1
5.2
ns
All flat panel
applications use
the falling edge
of FP_CLK to
latch their data.
VID_RDYMinDelayE,
VID_RDYMaxDelayE
VID_RDY delay from falling VID_CLK
(early mode)
3
10.5
ns
VID_RDYMinDelayN,
VID_RDYMaxDelayN
VID_RDY delay from rising VID_CLK
(normal mode)
3
9.5
ns
The mode for
VID_RDY (early
or normal) is set
with "Video Configuration Register"
Also applies to
PIXEL[23;16]
when in 16-bit
video mode.
Delay Times
FP_DATA[17:0], FP_HSYNC_OUT,
FP_VSYNC_OUT,
FP_DISP_ENA_OUT, FP_ENA_VDD,
FP_ENA_BKL, FP_CLK_EVEN
FP_CLK
FPOUTMaxDelay
FPOUTMinDelay
TFT/TV Outputs
Figure 5-6. Display TFT/TV Outputs Delays
Revision 4.1
235
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Geode™ CS5530
Electrical Specifications (Continued)
Geode™ CS5530
Electrical Specifications (Continued)
VID_CLK
VID_RDYMaxDelayE
VID_RDYMinDelayE
VID_RDY (Early)
VID_RDYMinDelayN
VID_RDYMaxDelayN
VID_RDY (Normal)
Figure 5-7. VID_RDY Delays
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236
Revision 4.1
Geode™ CS5530
Electrical Specifications (Continued)
VDD
VDD
AVDD
L4
L5
C7
EXTVREFIN
C8
VEXTREF
IREF
RSET
AVSS
IOUTR
R1
C1
R2
C2
R3
C3
L1
C4
AVSS
IOUTG
L2
To RGB
Video Connector
C5
AVSS
IOUTB
L3
C6
One-point
ground
AVSS
Legend
Part Designator
Value
R1-R3
RSET
C1-C6
C7
C8
L1-L3 (Optional)
L4-L5 (Optional)
75 Ohms, 1%
732 Ohms, 1%
33 pF
0.1 µF, Ceramic
2.2 µF, Electrolytic
120 Ohm Ferrite Bead
600 Ohm Ferrite Bead
Figure 5-8. Typical Video Connection Diagram
Revision 4.1
237
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Geode™ CS5530
6.0
Mechanical Specifications
Mechanical dimensions for the 352-Terminal TBGA (Tape
Ball Grid Array) package for the Geode CS5530 are pro-
vided in this section. Table 6-1 provides the values for the
dimensions given in Figure 6-1.
Table 6-1. 352 TBGA Package Dimension
Millimeters
Symbol
Minimum
Nominal
Maximum
A
--
--
1.7
A1
0.5
0.6
0.7
A2
--
--
1.0
b
0.60
0.75
0.90
D
35.0 BSC
D1
31.75 BSC
D2
33.4
33.6
33.8
D3
17.9
18.1
18.3
D4
15.4
15.6
15.8
E
35.0 BSC
E1
31.75 BSC
E2
33.4
33.6
33.8
E3
17.9
18.1
18.3
E4
15.4
15.6
15.8
e
1.27 BSC
s
0.635 BSC
aaa
0.15
Die Size
< or = 12
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Revision 4.1
Geode™ CS5530
Mechanical Specifications (Continued)
D
0.15 C A
D2
D3
D4
Non Tie-bar Type
Tie-bar Type
Detail "A"
E4 E3 E2 E
Note: Tie-bar feature (four corners)
optional, depending upon
assembly location.
1
A
0.2
0.15 C B
aaa C
A1
D1
C
A
B
Detail "B"
0.25 Min.
S
e
A2
AF
AE
AD
AC
AB
AA
Y
W
V
U
T
R
P
N
M
L
K
J
H
G
F
E
D
C
B
A
A
S
E1
e
B
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1718 19 20 21 22 23 24 25 26
b
0.1 M C AB
Figure 6-1. 352-Terminal TBGA Mechanical Package Outline
Revision 4.1
239
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Geode™ CS5530
Appendix A
Support Documentation
A.1 REVISION HISTORY
This document is a report of the revision/creation process
of the data book for the Geode CS5530 I/O companion.
Revision #
(PDF Date)
0.0
Any revisions (i.e., additions, deletions, parameter corrections, etc.) are recorded in the tables below.
Revisions / Comments
Creation Phase
0.1 (1/18/99)
First preliminary release to web while being circulated for engineering approval for a rev 1.0 release.
1.0 (3/24/99)
First release to web after engineering approval.
2.0 (4/6/99)
Major edit to current revision was updating the mechanical package.
3.0 (6/28/99)
Changed to National Semiconductor document format. Added changes from revisions 1.0, 2.0, and
3.0 of the data book addendum. Used “General Description” from newly created Product Overview
(references GXLV).
3.1(7/14/99)
Added minor changes for clarification purposes.
3.2 (8/27/99)
Added Geode™ technology verbiage and CS prefix. Also F3BAR+Memory Offset 10h and 12h
were documented incorrectly.
4.0 (2/2/00)
Many corrections to registers including reset values and notes changes. Added minor clarfications
and NAND Tree Test Mode.
4.1 (4/1/00)
Minor format changes. No technical changes.
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Revision 4.1
Geode™ CS5530 I/O Companion Multi-Function South Bridge
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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Tel: 1-800-272-9959
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Email: [email protected]
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
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