WINBOND W83877TD

WINBOND I/O
W83877TF/W83877TG
Release Date: May 2006 Version: 0.7
W83877TF/W83877TG
W83877TF Datasheet Revision History
PAGES
DATES
VERSION
VERSION
MAIN CONTENTS
ON WEB
1
n.a.
03/20/97
0.50
Not published, for internal reference
only.
2
n.a.
05/20/97
0.60
First published.
3
1, 8, 9, 63, 65,
78, 80,104107, 116, 118,
119, 133
03/20/98
0.61
Typo correction and data calibrated
4
n.a.
05/04/06
0.7
Add the lead-free parts W83877TG
5
6
7
8
9
10
-I-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Table of Contents1.
GENERAL DESCRIPTION .............................................................................................................. 1
2.
FEATURES ...................................................................................................................................... 2
3.
PIN CONFIGURATION .................................................................................................................... 4
4.
PIN DESCRIPTION......................................................................................................................... 5
5.
4.1
Host Interface.......................................................................................................................... 5
4.2
Serial Port Interface ................................................................................................................ 7
4.3
Multi-Mode Parallel Port.......................................................................................................... 8
4.4
FDC Interface........................................................................................................................ 13
FDC FUNCTIONAL DESCRIPTION .............................................................................................. 15
5.1
5.2
6.
W83877TF/TG FDC .............................................................................................................. 15
5.1.1
AT interface ............................................................................................................................15
5.1.2
FIFO (Data) ............................................................................................................................15
5.1.3
Data Separator .......................................................................................................................16
5.1.4
Write Precompensation ..........................................................................................................16
5.1.5
Perpendicular Recording Mode ..............................................................................................16
5.1.6
Tape Drive..............................................................................................................................17
5.1.7
FDC Core ...............................................................................................................................17
5.1.8
FDC Commands.....................................................................................................................17
5.1.9
FDC Instruction Sets ..............................................................................................................18
Register Descriptions ............................................................................................................ 26
5.2.1
Status Register A (SA Register) (Read base address + 0).....................................................26
5.2.2
Status Register B (SB Register) (Read base address + 1).....................................................28
5.2.3
Digital Output Register (DO Register) (Write base address + 2) ............................................30
5.2.4
Tape Drive Register (TD Register) (Read base address + 3).................................................30
5.2.5
Main Status Register (MS Register) (Read base address + 4)...............................................31
5.2.6
Data Rate Register (DR Register) (Write base address + 4) ..................................................31
5.2.7
FIFO Register (R/W base address + 5) ..................................................................................33
5.2.8
Digital Input Register (DI Register) (Read base address + 7).................................................34
5.2.9
Configuration Control Register (CC Register) (Write base address + 7) ................................36
UART PORT................................................................................................................................... 37
6.1
Universal Asynchronous Receiver/Transmitter (UART A, UART B) .................................... 37
6.2
Register Address................................................................................................................... 37
6.2.1
UART Control Register (UCR) (Read/Write) ..........................................................................38
6.2.2
UART Status Register (USR) (Read/Write) ............................................................................39
6.2.3
Handshake Control Register (HCR) (Read/Write) ..................................................................40
6.2.4
Handshake Status Register (HSR) (Read/Write)....................................................................41
-II -
W83877TF/W83877TG
7.
6.2.5
UART FIFO Control Register (UFR) (Write only)....................................................................42
6.2.6
Interrupt Status Register (ISR) (Read only) ............................................................................43
6.2.7
Interrupt Control Register (ICR) (Read/Write).........................................................................44
6.2.8
Programmable Baud Generator (BLL/BHL) (Read/Write).......................................................44
6.2.9
User-defined Register (UDR) (Read/Write) ............................................................................45
PARALLEL PORT ......................................................................................................................... 46
7.1
Printer Interface Logic ........................................................................................................... 46
7.2
Enhanced Parallel Port (EPP)............................................................................................... 48
7.3
7.2.1
Data Swapper.........................................................................................................................48
7.2.2
Printer Status Buffer ...............................................................................................................48
7.2.3
Printer Control Latch and Printer Control Swapper.................................................................49
7.2.4
EPP Address Port...................................................................................................................49
7.2.5
EPP Data Port 0-3 ..................................................................................................................50
7.2.6
Bit Map of Parallel Port and EPP Registers............................................................................50
7.2.7
EPP Pin Descriptions .............................................................................................................51
7.2.8
EPP Operation .......................................................................................................................51
Extended Capabilities Parallel (ECP) Port............................................................................ 52
7.3.1
ECP Register and Mode Definitions .......................................................................................52
7.3.2
Data and ecpAFifo Port ..........................................................................................................53
7.3.3
Device Status Register (DSR) ................................................................................................53
7.3.4
Device Control Register (DCR)...............................................................................................54
7.3.5
cFifo (Parallel Port Data FIFO) Mode = 010 ...........................................................................54
7.3.6
ecpDFifo (ECP Data FIFO) Mode = 011.................................................................................54
7.3.7
tFifo (Test FIFO Mode) Mode = 110 .......................................................................................55
7.3.8
cnfgA (Configuration Register A) Mode = 111 ........................................................................55
7.3.9
cnfgB (Configuration Register B) Mode = 111 ........................................................................55
7.3.10
ecr (Extended Control Register) Mode = all............................................................................56
7.3.11
Bit Map of ECP Port Registers ...............................................................................................57
7.3.12
ECP Pin Descriptions .............................................................................................................58
7.3.13
ECP Operation .......................................................................................................................59
7.3.14
FIFO Operation ......................................................................................................................59
7.3.15
DMA Transfers .......................................................................................................................60
7.3.16
Programmed I/O (NON-DMA) Mode.......................................................................................60
7.4
Extension FDD Mode (EXTFDD) .......................................................................................... 60
7.5
Extension 2FDD Mode (EXT2FDD) ...................................................................................... 60
8.
PLUG AND PLAY CONFIGURATION ........................................................................................... 61
9.
ACPI /LEGACY FEATURE AND AUTO POWER MANAGEMENT ............................................... 61
9.1
ACPI/Legacy power management ........................................................................................ 61
9.2
Device(auto) power management......................................................................................... 61
-III-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
10. SERIAL IRQ ................................................................................................................................... 62
10.1 Start Frame ........................................................................................................................... 63
10.2 IRQ/Data Frame.................................................................................................................... 63
10.3 Stop Frame ........................................................................................................................... 64
10.4 Reset and Initialization .......................................................................................................... 64
11. EXTENDED FUNCTION REGISTERS .......................................................................................... 65
11.1 Extended Functions Enable Registers (EFERs)................................................................... 65
11.2 Extended Function Index Registers (EFIRs), Extended Function Data Registers(EFDRs) . 66
11.2.1
Configuration Register 0 (CR0), default = 00H .......................................................................66
11.2.2
Configuration Register 1 (CR1), default = 00H .......................................................................67
11.2.3
Configuration Register 2 (CR2), default = 00H .......................................................................68
11.2.4
Configuration Register 3 (CR3), default = 30H .......................................................................68
11.2.5
Configuration Register 4 (CR4), default = 00H .......................................................................69
11.2.6
Configuration Register 5 (CR5), default = 00H .......................................................................70
11.2.7
Configuration Register 6 (CR6), default = 00H .......................................................................70
11.2.8
Configuration Register 7 (CR7), default = 00H .......................................................................72
11.2.9
Configuration Register 8 (CR8), default = 00H .......................................................................73
11.2.10 Configuration Register 9 (CR9), default = 0CH ......................................................................74
11.2.11 Configuration Register A (CR0A), default = 00H ....................................................................75
11.2.12 Configuration Register B (CR0B), default = 0CH....................................................................75
11.2.13 Configuration Register C (CR0C), default = 28H ....................................................................76
11.2.14 Configuration Register D (CR0D), default = A3H ...................................................................78
11.2.15 Configuration Register E (CR0E), Configuration Register F (CR0F) ......................................79
11.2.16 Configuration Register 10 (CR10), default = 00H ...................................................................80
11.2.17 Configuration Register 11 (CR11), default = 00H ...................................................................80
11.2.18 Configuration Register 12 (CR12), default = 00H ...................................................................81
11.2.19 Configuration Register 13 (CR13), default = 00H ...................................................................81
11.2.20 Configuration Register 14 (CR14), default = 00H ...................................................................82
11.2.21 Configuration Register 15 (CR15), default = 00H ...................................................................83
11.2.22 Configuration Register 16 (CR16), default = 04H ...................................................................85
11.2.23 Configuration Register 17 (CR17), default = 00H ...................................................................86
11.2.24 Configuration Register 18 (CR18), default=00H .....................................................................87
11.2.25 Configuration Register 19 (CR19), default=00H .....................................................................88
11.2.26 Configuration Register 20 (CR20) ..........................................................................................89
11.2.27 Configuration Register 23 (CR23) ..........................................................................................89
11.2.28 Configuration Register 24 (CR24) ..........................................................................................90
11.2.29 Configuration Register 25 (CR25) ..........................................................................................90
11.2.30 Configuration Register 26 (CR26) ..........................................................................................91
11.2.31 Configuration Register 27 (CR27) ..........................................................................................91
11.2.32 Configuration Register 28 (CR28) ..........................................................................................93
-IV -
W83877TF/W83877TG
11.2.33 Configuration Register 29 (CR29) ..........................................................................................94
11.2.34 Configuration Register 2C (CR2C), default=00H ....................................................................94
11.2.35 Configuration Register 2D (CR2D), default=00H ....................................................................95
11.2.36 Configuration Register 31 (CR31), default=00H .....................................................................96
11.2.37 Configuration Register 32 (CR32), default=00H .....................................................................98
11.2.38 Configuration Register 33 (CR33), default=00H .....................................................................99
11.2.39 Configuration Register 34 (CR34), default=00H .....................................................................99
11.2.40 Configuration Register 35 (CR35), default=00H ...................................................................100
11.2.41 Configuration Register 36 (CR36), default=00H ...................................................................100
11.2.42 Configuration Register 37 (CR37), default=00H ...................................................................101
11.2.43 Configuration Register 38 (CR38), default=00H ...................................................................101
11.2.44 Configuration Register (CR39), default=00H ........................................................................102
11.2.45 Configuration Register 3A (CR3A), default=00H ..................................................................102
11.2.46 Configuration Register 3B (CR3B), default=00H ..................................................................103
11.2.47 Configuration Register 40 (CR40), default=00H ...................................................................103
11.2.48 Configuration Register 41 (CR41), default=00H ...................................................................104
11.2.49 Configuration Register 42 (CR42), default=N/A....................................................................105
11.2.50 Configuration Register 43 (CR43), default=00H ...................................................................106
11.2.51 Configuration Register 44 (CR44), default=00H ...................................................................106
11.2.52 Configuration Register 45 (CR45), default=00H ...................................................................106
11.2.53 Bit Map Configuration Registers ...........................................................................................107
11.3 ACPI Registers Features .................................................................................................... 109
11.4 ACPI Registers (ACPIRs) ................................................................................................... 111
11.4.1
Power Management 1 Status Register 1 (PM1STS1) ..........................................................112
11.4.2
Power Management 1 Status Register 2 (PM1STS2) ..........................................................112
11.4.3
Power Management 1 Enable Register 1(PM1EN1).............................................................113
11.4.4
Power Management 1 Enable Register 2 (PM1EN2)............................................................113
11.4.5
Power Management 1 Control Register 1 (PM1CTL1) .........................................................114
11.4.6
Power Management 1 Control Register 2 (PM1CTL2) .........................................................115
11.4.7
Power Management 1 Control Register 3 (PM1CTL3) .........................................................115
11.4.8
Power Management 1 Control Register 4 (PM1CTL4) .........................................................116
11.4.9
Power Management 1 Timer 1 (PM1TMR1) .........................................................................116
11.4.10 Power Management 1 Timer 2 (PM1TMR2) .........................................................................117
11.4.11 Power Management 1 Timer 3 (PM1TMR3) .........................................................................117
11.4.12 Power Management 1 Timer 4 (PM1TMR4) .........................................................................118
11.4.13 General Purpose Event 0 Status Register 1 (GP0STS1) .....................................................118
11.4.14 General Purpose Event 0 Status Register 2 (GP0STS2) .....................................................119
11.4.15 General Purpose Event 0 Enable Register 1 (GP0EN1) ......................................................119
11.4.16 General Purpose Event 0 Enable Register 2 (GP0EN2) ......................................................120
11.4.17 General Purpose Event 1 Status Register 1 (GP1STS1) .....................................................121
-V-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.4.18 General Purpose Event 1 Status Register 2 (GP1STS2) .....................................................121
11.4.19 General Purpose Event 1 Enable Register 1 (GP1EN1) ......................................................122
11.4.20 General Purpose Event 1 Enable Register 2 (GP1EN2) ......................................................122
11.4.21 Bit Map Configuration Registers ...........................................................................................123
12. SPECIFICATIONS ....................................................................................................................... 124
12.1 Absolute Maximum Ratings ................................................................................................ 124
12.2 DC CHARACTERISTICS .................................................................................................... 124
12.3 AC Characteristics .............................................................................................................. 126
12.3.1
FDC: Data rate = 1 MB/500 KB/300 KB/250 KB/sec. ...........................................................126
12.3.2
UART/Parallel Port ...............................................................................................................128
12.3.3
Parallel Port Mode Parameters.............................................................................................128
12.3.4
EPP Data or Address Read Cycle Timing Parameters .........................................................129
12.3.5
EPP Data or Address Write Cycle Timing Parameters .........................................................130
12.3.6
Parallel Port FIFO Timing Parameters..................................................................................131
12.3.7
ECP Parallel Port Forward Timing Parameters ....................................................................131
12.3.8
ECP Parallel Port Reverse Timing Parameters ....................................................................131
13. TIMING WAVEFORMS ................................................................................................................ 132
13.1 FDC ..................................................................................................................................... 132
13.2 UART/Parallel ..................................................................................................................... 133
13.2.1
Modem Control Timing .........................................................................................................134
13.3 Parallel Port......................................................................................................................... 135
13.3.1
Parallel Port Timing ..............................................................................................................135
13.3.2
EPP Data or Address Read Cycle (EPP Version 1.9) ..........................................................136
13.3.3
EPP Data or Address Write Cycle (EPP Version 1.9)...........................................................137
13.3.4
EPP Data or Address Read Cycle (EPP Version 1.7) ..........................................................138
13.3.5
EPP Data or Address Write Cycle (EPP Version 1.7)...........................................................139
13.3.6
Parallel Port FIFO Timing .....................................................................................................139
13.3.7
ECP Parallel Port Forward Timing........................................................................................140
13.3.8
ECP Parallel Port Reverse Timing........................................................................................140
14. APPLICATION CIRCUITS ........................................................................................................... 141
14.1 Parallel Port Extension FDD ............................................................................................... 141
14.2 Parallel Port Extension 2FDD ............................................................................................. 142
14.3 Four FDD Mode .................................................................................................................. 142
15. ORDERING INFORMATION........................................................................................................ 143
16. HOW TO READ THE TOP MARKING......................................................................................... 144
17. PACKAGE DIMENSION .............................................................................................................. 145
-VI -
W83877TF/W83877TG
1.
GENERAL DESCRIPTION
W83877TF/TG is an enhanced version from Winbond's most popular I/O chip W83877F --- which
integrates the disk drive adapter, serial port (UART), IrDA 1.0 SIR, parallel port, configurable Plugand-Play registers for the whole chip --- plus additional powerful features: ACPI / legacy power
management, serial IRQ, and IRQ sharing.
The disk drive adapter functions of W83877TF/TG include a floppy disk controller compatible with the
industry standard 82077/765, data separator, write pre-compensation circuit, decode logic, data rate
selection, clock generator, drive interface control logic, interrupt and DMA logic. The wide range of
functions integrated into W83877TF/TG greatly reduces the number of components required for
interfacing with floppy disk drives. W83877TF/TG supports four 360K, 720K, 1.2M, 1.44M, or 2.88M
disk drives and data transfer rates of 250 Kb/S, 300 Kb/S, 500 Kb/S,1 Mb/S, and 2 Mb/S.
W83877TF/TG provides two high-speed serial communication ports (UARTs), one of which supports
serial Infrared communication. Each UART includes a 16-byte send/receive FIFO, a programmable
baud rate generator, complete modem control capability, and a processor interrupt system. One of
the UARTs support infrared (IR) IrDA1.0. Both UARTs provide legacy speed with baud rate up to
115.2K and provide advanced speed with baud rate up to 230k, 460k, and 921k bps which support
higher speed Modems.
W83877TF/TG supports one PC-compatible printer port (SPP), Bi-directional printer port (BPP) and
also Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP). Through the printer port
interface pins, also available are: Extension FDD Mode and Extension 2FDD Mode allowing one or
two external floppy disk drives to be connected. This function is especially valuable for notebook
computer applications.
Winbond W83877TF/TG provides functions that comply with ACPI (Advanced Configuration and
Power Interface), which includes support of legacy and ACPI power management through SMI or SCI
function pins. One 24-bits power management timer is implemented with the carry notify interrupt.
W83877TF/TG also has auto power management mode to reduce the power consumption.
The serial IRQ for PCI architecture is supported, ISA IRQs (IRQ1~IRQ15) can be cascaded into one
IRQSER pin. W83877TF/TG also features ISA bus IRQ sharing and allows two or more devices to
share the same IRQ pin.
TM
PC97 Hardware Design Guide. IRQs,
W83877TF/TG is made to fully comply with Microsoft
DMAs, and I/O space resources are flexible to adjust to meet ISA PnP requirement. Moreover
W83877TF/TG is made to meet the specification of PC97's requirement in the power management:
ACPI and DPM (Device Power Management).
The configuration registers support mode selection, function enable/disable, and power down function
selection. Furthermore, the configurable PnP registers are compatible with the Plug-and-Play feature
demand of Windows 95TM , which makes system resource allocation more efficient than ever.
Another benefit of W83877TF/TG is that it is pin-to-pin compatible to W83877F, and all of the 100-pin
Winbond I/O IC family. Thus makes the design of applications very convenient and flexible.
-1-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
2. FEATURES
General:
y
Plug & Play 1.0A Compliant
y
Support 8 IRQs (ISA), or 15 IRQs (Serial IRQ), 3 DMA channels, and 480 re-locatable address
y
Capable of ISA Bus IRQ Sharing
y
Comply with Microsoft PC 97 Hardware Design Guide
y
Support DPM (Device Power Management), ACPI
y
Report ACPI status interrupt by SCI signal from SCI pin, serial IRQ IRQSER pin, or IRQ A~H pins
y
Single 24MHz/48MHZ clock input
FDC:
y
Compatible with IBM PC AT disk drive systems
y
Variable write pre-compensation with track selectable capability
y
DMA enable logic
y
Supports floppy disk drives and tape drives
y
Detects all overrun and underrun conditions
y
Built-in address mark detection circuit to simplify the read electronics
y
FDD anti-virus functions with software write protect and FDD write enable signal (write data
signalwas forced to be inactive)
y
Supports up to four 3.5-inch or 5.25-inch floppy disk drives
y
Completely compatible with industry standard 82077
y
360K/720K/1.2M/1.44M/2.88M format; 250K, 300K, 500K, 1M, 2M bps data transfer rate
y
Supports vertical recording format
y
Support 3-mode FDD, and its Win95 driver
y
16-byte data FIFOs
UART:
y
Two high-speed 16550 compatible UARTs with 16-byte send/receive FIFOs
y
MIDI compatible
y
Fully programmable serial-interface characteristics:
y
−
5, 6, 7 or 8-bit characters
−
Even, odd or no parity bit generation/detection
−
1, 1.5 or 2 stop bits generation
Internal diagnostic capabilities:
−
Loop-back controls for communications link fault isolation
−
Break, parity, overrun, framing error simulation
-2 -
W83877TF/W83877TG
y
Programmable baud generator allows division of 1.8461 MHz and 24 MHz by 1 to (216-1)
y
Maximum baud rate is up to 921k bps for 14.768MHz and 1.5M bps for 24MHz
Infrared:
y
Supports IrDA version 1.0 SIR protocol with maximum baud rate up to 115.2K bps
y
Supports SHARP ASK-IR protocol with maximum baud rate up to 57600 bps
Parallel Port:
y
Compatible with IBM parallel port
y
Supports PS/2 compatible bi-directional parallel port
y
Supports Enhanced Parallel Port (EPP) − Compatible with IEEE 1284 specification
y
Supports Extended Capabilities Port (ECP) − Compatible with IEEE 1284 specification
y
Extension FDD mode supports disk drive B; and Extension 2FDD mode supports disk drives A
and B through parallel port
y
Enhanced printer port back-drive current protection
Others:
y
Programmable configuration settings
y
Immediate or automatic power-down mode for the power management
y
All hardware power-on settings have internal pull-up or pull-down resistors as default value
y
Dedicated Infrared Communication Pins
Package:
y
100-pin QFP (W83877TF/TG), and also 100-pin LQFP (W83877TD/TG)
-3-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
3. PIN CONFIGURATION
/
D
/
S
T
K
/ / R
M M AN C A
O O KWH 1
B A 0 P G 0
X
X
X
X
X
/
R
D
/ /
A
V
G I I A
T D D D D D D D D N O O E A A A A A D A A A A A
A 7 6 5 4 3 2 1 0 D W R N 9 8 7 6 5 D 4 3 2 1 0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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
INDEX
STEP
DSA
DSB
WE
WD
RWC
HEAD
DIR
GND
IRQ_H
IRQ_B
IRQIN
IRRX2
IRTX2
IRQ_A
TC
DACK_B
IRQ_F
DRQ_B
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
X
X
X
I / /
R C S
Q S C
I
G
X
D
R
Q
|
C
X
X
X
X
X
X
X
X
X
X
X
X
X
X
I M C / P P P P P P V P P /
O R L S D D D D D D D D D D
K M 0 1 2 3 4 5 D 6 7 A
C
I I
H
C
N
R
K
D
|
Y
C
-4 -
X
X
X
X
X
/
S
T
B
/
A
F
D
/
I
N
I
T
/
S
L
I
N
I
R
Q
|
E
X
X
X
X
X
X
X
B G / P S / S
U N A E L E I
S D C
C R N
Y
K
T R A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
RIB
DCDB
DSRB
CTSB
DTRB
RTSB
IRQ_C
SOUTB
SINB
DACK_A
GND
DRQ_A
SOUTA
IRQ_D
RTSA
DTRA
CTSA
DSRA
DCDA
RIA
W83877TF/W83877TG
4. PIN DESCRIPTION
(Note: Refer to section 12.2 DC CHARACTERISTICS for details.)
I/O8tc - TTL level output pin with 8 mA source-sink capability; CMOS level input voltage
I/O12t - TTL level bi-directional pin with 12 mA source-sink capability
I/O24t - TTL level bi-directional pin with 24 mA source-sink capability
OUT8t - TTL level output pin with 8 mA source-sink capability
OUT12t
- TTL level output pin with 12 mA source-sink capability
OD12 - Open-drain output pin with 12 mA sink capability
OD24 - Open-drain output pin with 24 mA sink capability
INt
- TTL level input pin
INts - TTL level Schmitt-triggered input pin
INc
- CMOS level input pin
INcs - CMOS level Schmitt-triggered input pin
4.1
Host Interface
SYMBOL
PIN
I/O
FUNCTION
D0−D7
66-73
I/O24t
A0−A9
51-55
INt
System address bus bits 0-9.
In ECP Mode, this pin is the A10 address input.
System data bus bits 0-7.
57-61
A10
75
INt
IOCHRDY
5
OD24
In EPP Mode, this pin is the IO Channel Ready output to extend
the host read/write cycle.
MR
6
INts
Master Reset. Active high. MR is low during normal operations.
CS
2
INt
Active low chip select signal.
AEN
62
INt
System address bus enable.
IOR
63
INts
CPU I/O read signal.
IOW
64
INts
CPU I/O write signal.
DRQ_B
100
OUT12t
DACK_B
98
INts
DRQ_C
4
OUT12t
DACK_ C
18
INts
DMA Acknowledge signal C.
TC
97
INts
Terminal Count. When active, this pin indicates termination of a
DMA transfer.
IRQIN
93
INt
Interrupt request input for IRQ routing ; For example , the IRQ12
can be routed into this port when PS/2 mouse is not installed.
DMA request signal B.
DMA Acknowledge signal B.
DMA request signal C.
-5-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Host Interface, continued
SYMBOL
IRQ_ A
PIN
I/O
96
OUT12t
GIO1
IRQ_ B
I/O12t
92
GIO0
OUT12t
I/O12t
FUNCTION
Interrupt request signal A, when CR16 Bit 5 (G1IQSEL) = 0.
General Purpose I/O port 1, when CR16 Bit 5 (G1IQSEL) = 1.
Interrupt request signal B, when CR16 Bit 4 (G0IQSEL) = 0.
General Purpose I/O port 0, when CR16 Bit 4 (G0IQSEL) = 1.
IRQ_C
44
OUT12t
Interrupt request signal C.
IRQ_D
37
OUT12t
Interrupt request signal D.
IRQ_E
23
OUT12t
Interrupt request signal E.
IRQ_F
99
OUT12t
Interrupt request signal F.
IRQ_G
1
OUT12t
Interrupt request signal G.
PCICLK
IRQ_H
INt
91
SERIRQ
OUT12t
PCI clock input, when the serial IRQ function is selected.
Interrupt request signal H.
I/O12t
Serial interrupt input/output, when the Serial IRQ mode is
selected by setting IRQMODS bit in CR31 register.
For the ACPI power management, SCI is active low 200ns for
the power management events, which generate an SCI interrupt
in the ACPI mode.
SCI
3
OD12
CLKIN
7
INt
SMI
8
OD12
24MHz/48MHZ clock input. CLKINSEL bit in CR2C register
should be correctly reset/set according to the input frequency.
For the legacy power management, the SMI is active low 200ns
for the power management events, which generate an SMI
interrupt in the legacy power management mode.
This SMI output is enabled by setting the SMI_EN bit in CR3A
register.
DACK_ A
41
INts
DRQ_A
39
OUT12t
DMA acknowledge signal A.
DMA request signal A.
-6 -
W83877TF/W83877TG
4.2
Serial Port Interface
SYMBOL
PIN
I/O
SINA
SINB/IRRX1
30
INt
Serial Input. It is used to receive serial data from the
communication link.
RIA
31
INt
RIB
50
Ring Indicator. An active low indicates that a ring signal is being
received by the modem or data set.
DCDA
32
INt
DCDB
49
Data Carrier Detect. An active low indicates the modem or data
set has detected a data carrier.
DSRA
33
INt
DSRB
48
Data Set Ready. An active low indicates the modem or data set
is ready to establish a communication link and transfer data to
the UART.
CTSA
34
INt
Clear To Send. It is the modem control input.
CTSB
47
DTRA
35
42
The function of these pins can be tested by reading Bit 4 of the
handshake status register.
I/O8tc
PHEFRAS
RTSA
PENFDC
UART A Data Terminal Ready. An active low informs the modem
or data set that the controller is ready to communicate.
During power-on reset, this pin is pulled down internally and is
defined as PHEFRAS, which provides the power-on value for
CR16 bit 0 (HEFRAS). While it is at Low, it selects the EFER
(Extended Functions Enable Register) to be 250H. While it is at
High, it selects the EFER to be 3F0H. A 4.7 kΩ is recommended
when intends to pull up at power-on reset.
36
I/O8tc
PPNPCVS
SOUTA
FUNCTION
UART A Request To Send. An active low informs the modem or
data set that the controller is ready to send data.
During power-on reset, this pin is pulled up internally and is
defined as PPNPCVS, which provides the power-on value for
CR16 bit 2 (PNPCVS). While it is at Low, all PnP-related
registers (CR20 to CR29) are all set to be 0s. While it is at High,
all PnP-related registers (CR20 to CR 29) are set to default
values. A 4.7 kΩ is recommended when intends to pull down at
power-on reset.
38
I/O8tc
UART A Serial Output. It is used to transmit serial data out to the
communication link.
During power-on reset, this pin is pulled up internally and used to
enable or disable the FDC. While it is at Low, FDC PnP-related
register (CR20) is set to be 0, i.e. FDC is disabled. While it is at
High, CR20 is set to the default value, i.e. FDC is enabled. A 4.7
kΩ is recommended when intends to pull down at power-on
reset.
-7-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Serial Port Interface, continued
SYMBOL
SOUTB
PIN
I/O
FUNCTION
43
I/O8tc
UART B Serial Output. It is used to transmit serial data out to the
communication link.
IRTX1
During power-on reset, this pin is pulled down internally and is
defined as PIRQMDS to select the IRQ mode. While it is at
Low, IRQ pins can be set to Normal mode or IRQ sharing mode
which decided by CR18. If it is at High, the Serial IRQ mode is
selected. A 4.7 kΩ is recommended when intending to pull up at
power-on reset.
PIRQMDS
RTSB
45
I/O8tc
PGOIQSEL
During power-on reset, this pin is pulled down internally and is
defined as PGOIQSEL, which provides the power-on value for
CR16 bit 4 and bit 5 (G0IQSEL & G1IQSEL). While it is at Low,
pins 92 and 96 function as IRQ pins IRQ_B,IRQ_A respectively.
While it is at high, pins 92 and 96 function as General Purpose
I/O pins GIO0,GIO1 respectively. A 4.7 kΩ is recommended
when intends to pull up at power-on reset.
DTRB
46
I/O8tc
IRTX2
95
OUT12t
IRRX2
94
INt
4.3
UART B Request To Send. An active low informs the modem or
data set that the controller is ready to send data.
UART B Data Terminal Ready. An active low informs the modem
or data set that the controller is ready to communicate.
Functions as a InfraRed data transmission line.
Functions as a InfraRed data receiving line.
Multi-Mode Parallel Port
The following pins have six functions, which are controlled by bits PRTMOD0, PRTMOD1, and
PRTMOD2 of CR0 and CR9 (refer to section 11.0, Extended Functions).
SYMBOL
BUSY
PIN
I/O
24
INt
FUNCTION
PRINTER MODE: BUSY
An active high input indicates that the printer is not ready to
receive data. This pin is pulled high internally. Refer to the
description of the parallel port for the definition of this pin in ECP
and EPP mode.
OD12
EXTENSION FDD MODE: MOB2
This pin is for Extension FDD B; the function of this pin is the
same as that of the MOB pin.
OD12
EXTENSION 2FDD MODE: MOB2
This pin is for Extension FDD A and B; the function of this pin is
the same as that of the MOB pin.
-8 -
W83877TF/W83877TG
Multi-Mode Parallel Port, continued
SYMBOL
ACK
PIN
I/O
26
INt
FUNCTION
PRINTER MODE: ACK
An active low input on this pin indicates that the printer has
received data and is ready to accept more data. This pin is pulled
high internally. Refer to the description of the parallel port for the
definition of this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: DSB2
This pin is for the Extension FDD B; its functions are the same as
those of the DSB pin.
OD12
EXTENSION 2FDD MODE: DSB2
This pin is for Extension FDD A and B; the function of this pin is
the same as that of the DSB pin.
PE
27
INt
PRINTER MODE: PE
An active high input on this pin indicates that the printer has
detected the end of the paper. This pin is pulled high internally.
Refer to the description of the parallel port for the definition of
this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: WD2
This pin is for Extension FDD B; its function is the same as that
of the WD pin.
OD12
EXTENSION 2FDD MODE: WD2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the WD pin.
SLCT
28
INt
PRINTER MODE: SLCT
An active high input on this pin indicates that the printer is
selected. This pin is pulled high internally. Refer to the
description of the parallel port for the definition of this pin in ECP
and EPP mode.
OD12
EXTENSION FDD MODE: WE2
This pin is for Extension FDD B; its functions are the same as
those of the WE pin.
OD12
EXTENSION 2FDD MODE: WE2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the WE pin.
-9-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Multi-Mode Parallel Port, continued
SYMBOL
ERR
PIN
I/O
29
INt
FUNCTION
PRINTER MODE: ERR
An active low input on this pin indicates that the printer has
encountered an error condition. This pin is pulled high internally.
Refer to the description of the parallel port for the definition of
this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: HEAD2
This pin is for Extension FDD B; its function is the same as that
of the HEAD pin.
OD12
EXTENSION 2FDD MODE: HEAD2
This pin is for Extension FDD A and B; its function is the same as
that of the HEAD pin.
SLIN
22
OD12
PRINTER MODE: SLIN
Output line for detection of printer selection. This pin is pulled
high internally. Refer to the description of the parallel port for the
definition of this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: STEP2
This pin is for Extension FDD B; its function is the same as that
of the STEP pin.
OD12
EXTENSION 2FDD MODE: STEP2
This pin is for Extension FDD A and B; its function is the same as
that of the STEP pin .
INIT
21
OD12
PRINTER MODE: INIT
Output line for the printer initialization. This pin is pulled high
internally. Refer to the description of the parallel port for the
definition of this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: DIR2
This pin is for Extension FDD B; its function is the same as that
of the DIR pin.
OD12
EXTENSION 2FDD MODE: DIR2
This pin is for Extension FDD A and B; its function is the same as
that of the DIR pin.
-10 -
W83877TF/W83877TG
Multi-Mode Parallel Port, continued
SYMBOL
AFD
PIN
I/O
20
OD12
FUNCTION
PRINTER MODE: AFD
An active low output from this pin causes the printer to auto feed
a line after a line is printed. This pin is pulled high internally.
Refer to the description of the parallel port for the definition of
this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: RWC2
This pin is for Extension FDD B; its function is the same as that
of the RWC pin.
OD12
EXTENSION 2FDD MODE: RWC2
This pin is for Extension FDD A and B; its function is the same as
that of the RWC pin.
STB
19
OD12
PRINTER MODE: STB
An active low output is used to latch the parallel data into the
printer. This pin is pulled high internally. Refer to the description
of the parallel port for the definition of this pin in ECP and EPP
mode.
PD0
9
-
EXTENSION FDD MODE: NC pin
-
EXTENSION 2FDD MODE: NC pin
I/O24t
PRINTER MODE: PD0
Parallel port data bus bit 0. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
INt
EXTENSION FDD MODE: INDEX2
This pin is for Extension FDD B; the function of this pin is the
same as that of the INDEX pin. This pin is pulled high internally.
INt
EXTENSION 2FDD MODE: INDEX2
This pin is for Extension FDD A and B; this function of this pin is
the same as INDEX pin. This pin is pulled high internally.
PD1
10
I/O24t
PRINTER MODE: PD1
Parallel port data bus bit 1. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
INt
EXTENSION FDD MODE: TRAK02
This pin is for Extension FDD B; the function of this pin is the
same as that of the TRAK0 pin. This pin is pulled high internally.
INt
EXTENSION. 2FDD MODE: TRAK02
This pin is for Extension FDD A and B; this function of this pin is
the same as TRAK0 pin. This pin is pulled high internally.
-11-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Multi-Mode Parallel Port, continued
SYMBOL
PD2
PIN
I/O
11
I/O24t
FUNCTION
PRINTER MODE: PD2
Parallel port data bus bit 2. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
INt
EXTENSION FDD MODE: WP2
This pin is for Extension FDD B; the function of this pin is the
same as that of the WP pin. This pin is pulled high internally.
INt
EXTENSION. 2FDD MODE: WP2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the WP pin. This pin is pulled high internally.
PD3
12
I/O24t
PRINTER MODE: PD3
Parallel port data bus bit 3. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
INt
EXTENSION FDD MODE: RDATA2
Motor on B for Extension FDD B; the function of this pin is the
same as that of the RDATA pin. This pin is pulled high internally.
INt
EXTENSION 2FDD MODE: RDATA2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the RDATA pin. This pin is pulled high
internally.
PD4
13
I/O24t
PRINTER MODE: PD4
Parallel port data bus bit 4. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
INt
EXTENSION FDD MODE: DSKCHG2
Drive select B for Extension FDD B; the function of this pin is the
same as that of DSKCHG pin. This pin is pulled high internally.
INt
EXTENSION 2FDD MODE: DSKCHG2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the DSKCHG pin. This pin is pulled high
internally.
PD5
14
I/O24t
PRINTER MODE: PD5
Parallel port data bus bit 5. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
I/O24t
EXTENSION FDD MODE: This pin is a tri-state output.
I/O24t
EXTENSION 2FDD MODE: This pin is a tri-state output.
-12 -
W83877TF/W83877TG
Multi-Mode Parallel Port, continued
SYMBOL
PD6
PIN
I/O
16
I/O24t
FUNCTION
PRINTER MODE: PD6
Parallel port data bus bit 6. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
-
OD24
EXTENSION FDD MODE: NC pin
EXTENSION. 2FDD MODE: MOA2
This pin is for Extension FDD A; its function is the same as that
of the MOA pin.
PD7
17
I/O24t
PRINTER MODE: PD7
Parallel port data bus bit 7. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
-
EXTENSION FDD MODE: NC pin
OD24
EXTENSION 2FDD MODE: DSA2
This pin is for Extension FDD A; its function is the same as that
of the DSA pin.
4.4
FDC Interface
SYMBOL
PIN
I/O
FUNCTION
WE
85
OD24
Write enable. An open drain output.
DIR
89
OD24
HEAD
88
OD24
RWC
87
OD24
WD
86
OD24
STEP
82
OD24
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
Head select. This open drain output determines which disk drive
head is active.
Logic 1 = side 0
Logic 0 = side 1
Reduced write current. This signal can be used on two-speed
disk drives to select the transfer rate. An open drain output.
Logic 0 = 250 Kb/s
Logic 1 = 500 Kb/s
When bit 5 of CR9 (EN3MODE) is set to high, the three-mode
FDD function is enabled, and the pin will have a different
definition. Refer to the EN3MODE bit in CR9.
Write data. This logic low open drain writes precompensation
serial data to the selected FDD. An open drain output.
Step output pulses. This active low open drain output produces a
pulse to move the head to another track.
-13-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
FDC Interface, continued
SYMBOL
PIN
I/O
FUNCTION
INDEX
81
INcs
This schmitt input from the disk drive is active low when the
head is positioned over the beginning of a track marked by an
index hole. This input pin is pulled up internally by an
approximately 1K ohm resistor. The resistor can be disabled
by bit 4 of CR6 (FIPURDWN).
TRAK0
78
INcs
Track 0. This schmitt input from the disk drive is active low
when the head is positioned over the outermost track. This
input pin is pulled up internally by an approximately 1K ohm
resistor. The resistor can be disabled by bit 4 of CR6
(FIPURDWN).
WP
77
INcs
Write protected. This active low schmitt input from the disk
drive indicates that the diskette is write-protected. This input
pin is pulled up internally by an approximately 1K ohm resistor.
The resistor can be disabled by bit 4 of CR6 (FIPURDWN).
RDATA
74
INcs
The read data input signal from the FDD. This input pin is
pulled up internally by an approximately 1K ohm resistor. The
resistor can be disabled by bit 4 of CR6 (FIPURDWN).
DSKCHG
76
INcs
Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up
internally by an approximately 1K ohm resistor. The resistor
can be disabled by bit 4 of CR6 (FIPURDWN).
MOA
79
OD24
Motor A On. When set to 0, this pin enables disk drive 0. This
is an open drain output.
MOB
80
OD24
Motor B On. When set to 0, this pin enables disk drive 1. This
is an open drain output.
DSA
83
OD24
Drive Select A. When set to 0, this pin enables disk drive A.
This is an open drain output.
DSB
84
OD24
Drive Select B. When set to 0, this pin enables disk drive B.
This is an open drain output.
VDD
15, 56
GND
25, 40 65, 90
+5 power supply for the digital circuitry.
Ground.
-14 -
W83877TF/W83877TG
5. FDC FUNCTIONAL DESCRIPTION
5.1
W83877TF/TG FDC
The floppy disk controller of W83877TF/TG integrates all of the logic required for floppy disk control.
The FDC implements a PC/AT or PS/2 solution. All programmable options default to compatible
values. The FIFO provides better system performance in multi-master systems. The digital data
separator supports up to data rate 1 M bits/sec. (2 M bits/sec for fast tape drive)
The FDC includes the following blocks: AT interface, Precompensation, Data Rate Selection, Digital
Data Separator, FIFO, and FDC Core.
5.1.1
AT interface
The interface consists of the standard asynchronous signals: RD , WR , A0-A3, IRQ, DMA control,
and a data bus. The address lines select between the configuration registers, the FIFO and
control/status registers. This interface can be switched between PC/AT, Model 30, or PS/2 normal
modes. The PS/2 register sets are a superset of the registers found in a PC/AT.
5.1.2
FIFO (Data)
The FIFO is 16 bytes in size and has programmable threshold values. All command parameter
information and disk data transfers go through the FIFO. Data transfers are governed by the RQM and
DIO bits in the Main Status Register.
The FIFO defaults to disabled mode after any form of reset. This maintains PC/AT hardware
compatibility. The default values can be changed through the CONFIGURE command. The advantage
of the FIFO is that it allows the system a larger DMA latency without causing disk errors. The following
tables give several examples of the delays with a FIFO. The data are based upon the following
formula:
THRESHOLD × (1/Data Rate) *8 - 1.5 μS = DELAY
FIFO THRESHOLD
MAXIMUM DELAY TO SERVICING AT 500K BPS
Data Rate
1 Byte
1 × 16 μS - 1.5 μS = 14.5 μS
2 Byte
2 × 16 μS - 1.5 μS = 30.5 μS
8 Byte
8 × 16 μS - 1.5 μS = 6.5 μS
15 Byte
15 × 16 μS - 1.5 μS = 238.5 μS
FIFO THRESHOLD
MAXIMUM DELAY TO SERVICING AT 1M BPS
Data Rate
1 Byte
1 × 8 μS - 1.5 μS = 6.5 μS
2 Byte
2 × 8 μS - 1.5 μS = 14.5 μS
8 Byte
8 × 8 μS - 1.5 μS = 62.5 μS
15 Byte
15 × 8 μS - 1.5 μS = 118.5 μS
-15-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
At the start of a command the FIFO is always disabled and command parameters must be sent based
upon the RQM and DIO bit settings in the main status register. When the FDC enters the command
execution phase, it clears the FIFO of any data to ensure that invalid data are not transferred.
An overrun and underrun will terminate the current command and the data transfer. Disk writes will
complete the current sector by generating a 00 pattern and valid CRC. Reads require the host to
remove the remaining data so that the result phase may be entered.
DMA transfers are enabled with the SPECIFY command and are initiated by the FDC by activating the
DRQ pin during a data transfer command. The FIFO is enabled directly by asserting DACK and
addresses need not be valid.
Note that if the DMA controller is programmed to function in verify mode a pseudo read is performed
by the FDC based only on DACK . This mode is only available when the FDC has been configured
into byte mode (FIFO disabled) and is programmed to do a read. With the FIFO enabled the above
operation is performed by using the new VERIFY command. No DMA operation is needed.
5.1.3
Data Separator
The function of the data separator is to lock onto the incoming serial read data. When a lock is
achieved the serial front end logic of the chip is provided with a clock which is synchronized to the
read data. The synchronized clock, called the Data Window, is used to internally sample the serial
data portion of the bit cell, and the alternate state samples the clock portion. Serial to parallel
conversion logic separates the read data into clock and data bytes.
The Digital Data Separator (DDS) has three parts: control logic, error adjustment, and speed tracking.
The DDS circuit cycles once every 12 clock cycles ideally. Any data pulse input will be synchronized
and then adjusted by immediate error adjustment. The control logic will generate RDD and RWD for
every pulse input. During any cycle where no data pulse is present, the DDS cycles are based on
speed. A digital integrator is used to keep track of the speed changes in the input data stream.
5.1.4
Write Precompensation
The write precompensation logic is used to minimize bit shifts in the RDDATA stream from the disk
drive. Shifting of bits is a known phenomenon in magnetic media and is dependent on the disk media
and the floppy drive.
The FDC monitors the bit stream that is being sent to the drive. The data patterns that require
precompensation are well known. Depending upon the pattern, the bit is shifted either early or late
relative to the surrounding bits.
5.1.5
Perpendicular Recording Mode
The FDC is also capable of interfacing directly to perpendicular recording floppy drives. Perpendicular
recording differs from the traditional longitudinal method in that the magnetic bits are oriented
vertically. This scheme packs more data bits into the same area.
FDCs with perpendicular recording drives can read standard 3.5" floppy disks and can read and write
perpendicular media. Some manufacturers offer drives that can read and write standard and
perpendicular media in a perpendicular media drive.
A single command puts the FDC into perpendicular mode. All other commands operate as they
normally do. The perpendicular mode requires a 1 Mbps data rate for the FDC. At this data rate the
FIFO eases the host interface bottleneck due to the speed of data transfer to or from the disk.
-16 -
W83877TF/W83877TG
5.1.6
Tape Drive
The W83877TF/TG supports standard tape drives (1 Mbps, 500 Kbps, 250 Kbps) and new fast tape
drive (2M bps).
5.1.7
FDC Core
The W83877TF/TG FDC is capable of performing twenty commands. Each command is initiated by a
multi-byte transfer from the microprocessor. The result can also be a multi-byte transfer back to the
microprocessor. Each command consists of three phases: command, execution, and result.
Command
The microprocessor issues all required information to the controller to perform a specific operation.
Execution
The controller performs the specified operation.
Result
After the operation is completed, status information and other housekeeping information is provided to
the microprocessor.
5.1.8
FDC Commands
Command Symbol Descriptions:
C:
Cylinder number 0 - 256
D:
Data Pattern
DIR:
Step Direction
DIR = 0, step out
DIR = 1, step in
DS0:
Disk Drive Select 0
DS1:
Disk Drive Select 1
DTL:
Data Length
EC:
Enable Count
EOT:
End of Track
EFIFO:
Enable FIFO
EIS:
Enable Implied Seek
EOT:
End of track
FIFOTHR: FIFO Threshold
GAP:
Gap length selection
GPL:
Gap Length
H:
Head number
HDS:
Head number select
HLT:
Head Load Time
HUT:
Head Unload Time
LOCK:
Lock EFIFO, FIFOTHR, PTRTRK bits prevent affected by software reset
MFM:
MFM or FM Mode
-17-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
MT:
N:
NCN:
ND:
OW:
PCN:
POLL:
PRETRK:
R:
RCN:
R/W:
SC:
SK:
SRT:
ST0:
ST1:
ST2:
ST3:
WG:
5.1.9
Multitrack
The number of data bytes written in a sector
New Cylinder Number
Non-DMA Mode
Overwritten
Present Cylinder Number
Polling Disable
Precompensation Start Track Number
Record
Relative Cylinder Number
Read/Write
Sector/per cylinder
Skip deleted data address mark
Step Rate Time
Status Register 0
Status Register 1
Status Register 2
Status Register 3
Write gate alters timing of WE
FDC Instruction Sets
(1) Read Data
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
REMARKS
Command
W
W
W
W
MT
MFM
SK
0
0
1
1
0
Command codes
0
0
0
0
0
HDS
DS1
DS0
W
W
W
W
W
---------------------- C --------------------------------------------- H --------------------------------------------- R --------------------------------------------- N ------------------------------------------- EOT ------------------------------------------ GPL ------------------------------------------ DTL -----------------------
Execution
Result
R
R
R
R
R
R
R
Sector ID information
prior to command
execution
-------------------- ST0 ------------------------------------------ ST1 ------------------------------------------ ST2 -------------------------------------------- C --------------------------------------------- H --------------------------------------------- R --------------------------------------------- N ------------------------
-18 -
Data transfer between the
FDD and system
Status information after
command execution
Sector ID information
after command execution
W83877TF/W83877TG
(2) Read Deleted Data
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
REMARKS
Command
W
MT
MFM
SK
0
1
1
0
0
Command codes
W
0
0
0
0
0
HDS
DS1
DS0
W
---------------------- C ------------------------
W
---------------------- H ------------------------
W
---------------------- R ------------------------
W
---------------------- N ------------------------
W
-------------------- EOT -----------------------
W
-------------------- GPL -----------------------
W
-------------------- DTL -----------------------
Execution
Result
Sector ID information prior
to command execution
Data transfer between the
FDD and system
R
-------------------- ST0 -----------------------
R
-------------------- ST1 -----------------------
R
-------------------- ST2 -----------------------
R
---------------------- C ------------------------
R
---------------------- H ------------------------
R
---------------------- R ------------------------
R
---------------------- N ------------------------
-19-
Status information after
command execution
Sector ID information after
command execution
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
(3) Read A Track
PHASE
Command
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
0
MFM
0
0
0
0
1
0
W
0
0
0
0
0
HDS
DS1
DS0
W
W
---------------------- C --------------------------------------------- H ------------------------
W
W
---------------------- R --------------------------------------------- N ------------------------
W
W
-------------------- EOT ------------------------------------------ GPL -----------------------
W
-------------------- DTL -----------------------
Command codes
Sector ID information prior
to command execution
Execution
Result
REMARKS
Data transfer between the
FDD and system; FDD
reads contents of all
cylinders from index hole to
EOT
R
R
R
-------------------- ST0 ------------------------------------------ ST1 ------------------------------------------ ST2 -----------------------
Status information after
command execution
R
R
R
R
---------------------- C --------------------------------------------- H --------------------------------------------- R --------------------------------------------- N ------------------------
Sector ID information after
command execution
(4) Read ID
PHASE
Command
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
0
MFM
0
0
1
0
1
0
W
0
0
0
0
0
HDS
DS1
DS0
Execution
Result
REMARKS
Command codes
The first correct ID
information on the cylinder
is stored in Data Register
R
-------------------- ST0 -----------------------
R
-------------------- ST1 -----------------------
R
-------------------- ST2 -----------------------
R
R
---------------------- C ------------------------
R
---------------------- R ------------------------
R
---------------------- N ------------------------
---------------------- H ------------------------
-20 -
Status information after
command execution
Disk status after the
command has been
completed
W83877TF/W83877TG
(5) Verify
PHASE
Command
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
MT
MFM
SK
1
0
1
1
0
W
EC
0
0
0
0
HDS
DS1
DS0
W
---------------------- C ------------------------
W
---------------------- H ------------------------
W
---------------------- R ------------------------
W
---------------------- N ------------------------
W
-------------------- EOT -----------------------
W
-------------------- GPL -----------------------
REMARKS
Command codes
Sector ID information prior
to command execution
-------------------- DTL/SC ------------------Execution
Result
No data transfer takes
place
R
-------------------- ST0 -----------------------
R
-------------------- ST1 -----------------------
R
-------------------- ST2 -----------------------
R
---------------------- C ------------------------
R
---------------------- H ------------------------
R
---------------------- R ------------------------
R
---------------------- N ------------------------
Status information after
command execution
Sector ID information after
command execution
(6) Version
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
1
0
0
0
0
Command codes
Result
W
1
0
0
1
0
0
0
0
Enhanced controller
-21-
REMARKS
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
(7) Write Data
PHASE
Command
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
W
W
W
MT
MFM
0
0
0
1
0
1
0
0
0
0
0
HDS
DS1
DS0
---------------------- C --------------------------------------------- H ------------------------
W
W
W
W
W
Sector ID information
prior to Command
execution
---------------------- R --------------------------------------------- N ------------------------------------------- EOT ------------------------------------------ GPL ------------------------------------------ DTL -----------------------
Execution
Result
REMARKS
Command codes
R
R
R
R
R
R
R
Data transfer between the
FDD and system
Status information after
Command execution
-------------------- ST0 ------------------------------------------ ST1 ------------------------------------------ ST2 -------------------------------------------- C --------------------------------------------- H --------------------------------------------- R --------------------------------------------- N ------------------------
Sector ID information
after Command execution
(8) Write Deleted Data
PHASE
Command
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
W
W
W
W
W
W
W
W
MT
MFM
0
0
1
0
0
1
0
0
0
0
0
HDS
DS1
DS0
---------------------- C --------------------------------------------- H --------------------------------------------- R --------------------------------------------- N ------------------------------------------- EOT ------------------------------------------ GPL ------------------------------------------ DTL -----------------------
Execution
Result
R
R
R
R
R
R
R
-------------------- ST0 ------------------------------------------ ST1 ------------------------------------------ ST2 -------------------------------------------- C --------------------------------------------- H --------------------------------------------- R --------------------------------------------- N ------------------------
-22 -
REMARKS
Command codes
Sector ID information prior
to command execution
Data transfer between the
FDD and system
Status information after
command execution
Sector ID information after
command execution
W83877TF/W83877TG
(9) Format A Track
PHASE
Command
Execution
for Each
Sector
Repeat:
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
0
MFM
0
0
1
1
0
1
W
0
0
0
0
0
HDS
DS1
DS0
REMARKS
Command codes
W
---------------------- N ------------------------
Bytes/Sector
W
--------------------- SC -----------------------
Sectors/Cylinder
W
--------------------- GPL ---------------------
Gap 3
W
---------------------- D ------------------------
Filler Byte
W
---------------------- C ------------------------
Input Sector Parameters
W
---------------------- H ------------------------
W
---------------------- R ------------------------
W
---------------------- N ------------------------
R
-------------------- ST0 -----------------------
R
-------------------- ST1 -----------------------
R
-------------------- ST2 -----------------------
R
---------------- Undefined -------------------
R
---------------- Undefined -------------------
R
---------------- Undefined -------------------
R
---------------- Undefined -------------------
Result
Status information after
command execution
(10) Recalibrate
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
0
0
1
1
1
W
0
0
0
0
0
0
DS1
DS0
Execution
REMARKS
Command codes
Head retracted to Track 0
Interrupt
(11) Sense Interrupt Status
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
0
1
0
0
0
Result
R
---------------- ST0 -------------------------
R
---------------- PCN -------------------------
-23-
REMARKS
Command codes
Status information at the
end of each seek operation
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
(12) Specify
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
0
0
0
1
1
W
| ---------SRT ----------- | --------- HUT ---------- |
W
|------------ HLT -----------------------------------| ND
REMARKS
Command codes
(13) Seek
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
0
1
1
1
1
W
0
0
0
0
0
HDS
DS1
DS0
W
Execution
REMARKS
Command codes
-------------------- NCN -----------------------
R
Head positioned over
proper cylinder on diskette
(14) Configure
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
1
0
0
1
1
W
0
0
0
0
0
0
0
0
W
0
W
| --------------------PRETRK ---------------------- |
REMARKS
Configure information
EIS EFIFO POLL | ------ FIFOTHR ----|
Execution
Internal registers written
(15) Relative Seek
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
1
DIR
0
0
1
1
1
1
W
0
0
0
0
0
HDS
DS1
DS0
W
| -------------------- RCN ---------------------------- |
-24 -
REMARKS
Command codes
W83877TF/W83877TG
(16) Dumpreg
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
0
1
1
1
0
Result
R
-------------------- PCN-Drive 0-----------------
R
-------------------- PCN-Drive 1 ----------------
R
-------------------- PCN-Drive 2-----------------
R
-------------------- PCN-Drive 3 ----------------
R
-------- SRT ----------- | -------- HUT ----------
R
------------ HLT -------------------------------------| ND
R
-------------------- SC/EOT --------------------
R
R
LOCK
0
0
EIS
D3
D2
D1
EFIFO POLL|
D0
REMARKS
Registers placed in FIFO
GAP WG
--- FIFOTHR ---- |
--------------------PRETRK ---------------------
R
(17) Perpendicular Mode
PHASE
Command
R/W
D7
D6
D5
D4
D3
D2
D1
D0
W
0
0
0
1
0
0
1
0
REMARKS
W
OW
0
D3
D2
D1
D0
GAP
WG
Command code
(18) Lock
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
LOCK
0
0
1
0
1
0
0
Result
R
0
0
0
LOCK
0
0
0
0
REMARKS
Command code
(19) Sense Drive Status
PHASE
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Command
W
0
0
0
0
0
1
0
0
W
0
0
0
0
0
HDS
DS1
DS0
Result
R
---------------- ST3 -------------------------
REMARKS
Command code
Status information about
disk drive
(20) Invalid
PHASE
R/W
D7
D6
D5
D4
D3
D2
Command
W
------------- Invalid Codes -----------------
Result
R
-------------------- ST0 ----------------------
-25-
D1
D0
REMARKS
Invalid codes (no operation FDC goes into standby
state)
ST0 = 80H
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
5.2
Register Descriptions
There are several status, data, and control registers in W83877TF/TG. These registers are defined
below:
ADDRESS
5.2.1
REGISTER
OFFSET
READ
WRITE
base address + 0
base address + 1
base address + 2
base address + 3
base address + 4
base address + 5
base address + 7
SA REGISTER
SB REGISTER
DO REGISTER
TD REGISTER
DR REGISTER
DT (FIFO) REGISTER
CC REGISTER
TD REGISTER
MS REGISTER
DT (FIFO) REGISTER
DI REGISTER
Status Register A (SA Register) (Read base address + 0)
This register is used to monitor several disk interface pins in PS/2 and Model 30 modes. In PS/2
mode, the bit definitions for this register are as follows:
7
6
5
4
3
2
1
0
DIR
WP
INDEX
HEAD
TRAK0
STEP
DRV2
INIT PENDING
INIT PENDING (Bit 7):
This bit indicates the value of the floppy disk interrupt output.
DRV2 (Bit 6):
0
A second drive has been installed
1
A second drive has not been installed
STEP (Bit 5):
This bit indicates the complement of STEP output.
TRAK0 (Bit 4):
This bit indicates the value of TRAK0 input.
HEAD (Bit 3):
This bit indicates the complement of HEAD output.
0
side 0
1
side 1
-26 -
W83877TF/W83877TG
INDEX (Bit 2):
This bit indicates the value of INDEX output.
WP (Bit 1):
0
disk is write-protected
1
disk is not write-protected
DIR (Bit 0)
This bit indicates the direction of head movement.
0
outward direction
1
inward direction
In PS/2 Model 30 mode, the bit definitions for this register are as follows:
7
6
5
4
3
2
1
0
DIR
WP
INDEX
HEAD
TRAK0
STEP F/F
DRQ
INIT PENDING
INIT PENDING (Bit 7):
This bit indicates the value of the floppy disk interrupt output.
DRQ (Bit 6):
This bit indicates the value of DRQ output pin.
STEP F/F (Bit 5):
This bit indicates the complement of latched STEP output.
TRAK0 (Bit 4):
This bit indicates the complement of TRAK0 input.
HEAD (Bit 3):
This bit indicates the value of HEAD output.
0
side 1
1
side 0
-27-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
INDEX (Bit 2):
This bit indicates the complement of INDEX output.
WP (Bit 1):
0
disk is not write-protected
1
disk is write-protected
DIR (Bit 0)
This bit indicates the direction of head movement.
0
inward direction
1
outward direction
5.2.2
Status Register B (SB Register) (Read base address + 1)
This register is used to monitor several disk interface pins in PS/2 and Model 30 modes. In PS/2
mode, the bit definitions for this register are as follows:
7
6
1
1
5
4
3
2
1
0
MOT EN A
MOT EN B
WE
RDATA Toggle
WDATA Toggle
Drive SEL0
Drive SEL0 (Bit 5):
This bit indicates the status of DO REGISTER bit 0 (drive select bit 0).
WDATA Toggle (Bit 4):
This bit changes state at every rising edge of the WD output pin.
RDATA Toggle (Bit 3):
This bit changes state at every rising edge of the RDATA output pin.
WE (Bit 2):
This bit indicates the complement of the WE output pin.
MOT EN B (Bit 1)
This bit indicates the complement of the MOB output pin.
MOT EN A (Bit 0)
This bit indicates the complement of the MOA output pin.
In PS/2 Model 30 mode, the bit definitions for this register are as follows:
-28 -
W83877TF/W83877TG
7
6
5
4
3
2
1
0
DSC
DSD
WE F/F
RDATA F/F
WD F/F
DSA
DSB
DRV2
DRV2 (Bit 7):
0
A second drive has been installed
1
A second drive has not been installed
DSB (Bit 6):
This bit indicates the status of DSB output pin.
DSA (Bit 5):
This bit indicates the status of DSA output pin.
WD F/F(Bit 4):
This bit indicates the complement of the latched WD output pin at every rising edge of the WD output
pin.
RDATA F/F(Bit 3):
This bit indicates the complement of the latched RDATA output pin .
WE F/F (Bit 2):
This bit indicates the complement of latched WE output pin.
DSD (Bit 1):
0
Drive D has been selected
1
Drive D has not been selected
DSC (Bit 0):
0
Drive C has been selected
1
Drive C has not been selected
-29-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
5.2.3
Digital Output Register (DO Register) (Write base address + 2)
The Digital Output Register is a write-only register controlling drive motors, drive selection, DRQ/IRQ
enable, and FDC resetting. All the bits in this register are cleared by the MR pin. The bit definitions are
as follows:
7
6
5
3
4
1-0
2
Drive Select: 00 select drive A
01 select drive B
10 select drive C
11 select drive D
Floppy Disk Controller Reset
Active low resets FDC
DMA and INT Enable
Active high enable DRQ/IRQ
Motor Enable A. Motor A on when active high
Motor Enable B. Motor B on when active high
Motor Enable C. Motor C on when active high
Motor Enable D. Motor D on when active high
5.2.4
Tape Drive Register (TD Register) (Read base address + 3)
This register is used to assign a particular drive number to the tape drive support mode of the data
separator. This register also holds the media ID, drive type, and floppy boot drive information of the
floppy disk drive. In normal floppy mode, this register includes only bit 0 and 1. The bit definitions are
as follows:
7
6
5
4
3
2
X
X
X
X
X
X
1
0
Tape sel 0
Tape sel 1
If three mode FDD function is enabled (EN3MODE = 1 in CR9), the bit definitions are as follows:
7
6
5
4
3
2
1
0
Tape Sel 0
Tape Sel 1
Floppy boot drive 0
Floppy boot drive 1
Drive type ID0
Drive type ID1
Media ID0
Media ID1
Media ID1 Media ID0 (Bit 7, 6):
These two bits are read only. These two bits reflect the value of CR8 bit 3, 2.
Drive type ID1 Drive type ID0 (Bit 5, 4):
These two bits reflect two of the bits of CR7. Which two bits are reflected depends on the last drive
selected in the DO REGISTER.
-30 -
W83877TF/W83877TG
Floppy Boot drive 1, 0 (Bit 3, 2):
These two bits reflect the value of CR8 bit 1, 0.
Tape Sel 1, Tape Sel 0 (Bit 1, 0):
These two bits assign a logical drive number to the tape drive. Drive 0 is not available as a tape drive
and is reserved as the floppy disk boot drive.
5.2.5
TAPE SEL 1
TAPE SEL 0
DRIVE SELECTED
0
0
None
0
1
1
1
0
2
1
1
3
Main Status Register (MS Register) (Read base address + 4)
The Main Status Register is used to control the flow of data between the microprocessor and the
controller. The bit definitions for this register are as follows:
7
6
5
4
3
2
1
0
FDD 0 Busy, (D0B = 1), FDD number 0 is in the SEEK mode.
FDD 1 Busy, (D1B = 1), FDD number 1 is in the SEEK mode.
FDD 2 Busy, (D2B = 1), FDD number 2 is in the SEEK mode.
FDD 3 Busy, (D3B = 1), FDD number 3 is in the SEEK mode.
FDC Busy, (CB). A read or write command is in the process when CB = HIGH.
Non-DMA mode, the FDC is in the non-DMA mode, this bit is set only during the
execution phase in non-DMA mode.
Transition to LOW state indicates execution phase has ended.
DATA INPUT/OUTPUT, (DIO). If DIO= HIGH then transfer is from Data Register to the processor.
If DIO = LOW then transfer is from processor to Data Register.
Request for Master (RQM). A high on this bit indicates Data Register is ready to send or receive data to or from the processor.
5.2.6
Data Rate Register (DR Register) (Write base address + 4)
The Data Rate Register is used to set the transfer rate and write precompensation. The data rate of
the FDC is programmed by the CC REGISTER for PC-AT and PS/2 Model 30 and PS/2 mode, and
not by the DR REGISTER. The real data rate is determined by the most recent write to either of the
DR REGISTER or CC REGISTER.
7
6
5
4
3
2
1
0
0
DRATE0
DRATE1
PRECOMP0
PRECOMP1
PRECOMP2
POWER DOWN
S/W RESET
-31-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
S/W RESET (Bit 7):
This bit is the software reset bit.
POWER-DOWN (Bit 6):
0
FDC in normal mode
1
FDC in power-down mode
PRECOMP2 PRECOMP1 PRECOMP0 (Bit 4, 3, 2):
These three bits select the value of write precompensation. The following tables show the
precompensation values for the combination of these bits.
PRECOMPENSATION DELAY
PRECOM
2
1
0
250K - 1Mbps
2 Mbps Tape drive
0
0
0
Default Delays
Default Delays
0
0
1
41.67 nS
20.8nS
0
1
0
83.34 nS
41.17nS
0
1
1
125.00 nS
62.5nS
1
0
0
166.67 nS
83.3nS
1
0
1
208.33 nS
104.2nS
1
1
0
250.00 nS
125.00nS
1
1
1
0.00 nS (disabled)
0.00nS (disabled)
DATA RATE
DEFAULT PRECOMPENSATION DELAYS
250 KB/S
125 nS
300 KB/S
125 nS
500 KB/S
125 nS
1 MB/S
41.67 nS
2 MB/S
20.8 nS
DRATE1 DRATE0 (Bit 1, 0):
These two bits select the data rate of the FDC and reduced write current control.
00 500 KB/S (MFM), 250 KB/S (FM), RWC = 1.
01 300 KB/S (MFM), 150 KB/S (FM), RWC = 0.
10 250 KB/S (MFM), 125 KB/S (FM), RWC = 0.
11 1 MB/S (MFM), Illegal (FM), RWC = 1.
The 2MB/S data rate for Tape drive is only supported by setting 01 to DRATE1 and DRATE0 bits, as
well as setting 10 to DRTA1 and DRTA0 bits which are two of the Configuration CR2D. Please refer to
the function of CR2D and the data rate table for individual data rates setting.
-32 -
W83877TF/W83877TG
5.2.7
FIFO Register (R/W base address + 5)
The Data Register consists of four status registers in a stack with only one register presented to the
data bus at a time. This register stores data, commands, and parameters and provides diskette-drive
status information. Data bytes are passed through the data register to program or obtain results after
a command. In the W83877TF/TG, this register defaults to FIFO disabled mode after reset. The FIFO
can change its value and enable its operation through the CONFIGURE command.
Status Register 0 (ST0)
7-6
5
3
4
2
1-0
US1, US0 Drive Select:
00 Drive A selected
01 Drive B selected
10 Drive C selected
11 Drive D selected
HD Head address:
1 Head selected
0 Head selected
NR Not Ready:
1 Drive is not ready
0 Drive is ready
EC Equipment Check:
1 When a fault signal is received from the FDD or the track
0 signal fails to occur after 77 step pulses
0 No error
SE Seek end:
1 seek end
0 seek error
IC Interrupt Code:
00 Normal termination of command
01 Abnormal termination of command
10 Invalid command issue
11 Abnormal termination because the ready signal from FDD changed state during command executio
Status Register 1 (ST1)
7
6
5
4
3
2
1
0
Missing Address Mark. 1 When the FDC cannot detect the data address mark
or the data address mark has been deleted.
NW (Not Writable). 1 If a write Protect signal is detected from the diskette drive during
execution of write data.
ND (No DATA). 1 If specified sector cannot be found during execution of a read, write or verifly data.
Not used. This bit is always 0.
OR (Over Rum). 1 If the FDC is not serviced by the host system within a certain time interval during data transfer.
DE (data Error).1 When the FDC detects a CRC error in either the ID field or the data field.
Not used. This bit is always 0.
EN (End of track). 1 When the FDC tries to access a sector beyond the final sector of a cylinder.
-33-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Status Register 2 (ST2)
7
6
4
5
3
0
1
2
MD (Missing Address Mark in Data Field).
1 If the FDC cannot find a data address mark
(or the address mark has been deleted)
when reading data from the media
0 No error
BC (Bad Cylinder)
1 Bad Cylinder
0 No error
SN (Scan Not satisfied)
1 During execution of the Scan command
0 No error
SH (Scan Equal Hit)
1 During execution of the Scan command, if the equal condition is satisfied
0 No error
WC (Wrong Cylinder)
1 Indicates wrong Cylinder
DD (Data error in the Data field)
1 If the FDC detects a CRC error in the data field
0 No error
CM (Control Mark)
1 During execution of the read data or scan command
0 No error
Not used. This bit is always 0
Status Register 3 (ST3)
6
7
4
5
2
3
1
0
US0 Unit Select 0
US1 Unit Select 1
HD Head Address
TS Two-Side
TO Track 0
RY Ready
WP Write Protected
FT Fault
5.2.8
Digital Input Register (DI Register) (Read base address + 7)
The Digital Input Register is an 8-bit read-only register used for diagnostic purposes. In a PC/XT or AT
only Bit 7 is checked by the BIOS. When the register is read, Bit 7 shows the complement of
DSKCHG , while other bits of the data bus remain in tri-state. Bit definitions are as follows:
7
6
5
4
3
2
1
0
x x x x x x x
for the hard disk controller
x Reserved
During a read of this register, these bits are in tri-stat
DSKCHG
-34 -
W83877TF/W83877TG
In the PS/2 mode, the bit definitions are as follows:
7
6
5
4
3
1
1
1
1
2
0
1
HIGH DENS
DRATE0
DRATE1
DSKCHG
DSKCHG (Bit 7):
This bit indicates the complement of the DSKCHG input.
Bit 6-3: These bits are always a logic 1 during a read.
DRATE1 DRATE0 (Bit 2, 1):
These two bits select the data rate of the FDC. Refer to the DR register bits 1 and 0 for the settings
corresponding to the individual data rates.
HIGH DENS (Bit 0):
0
500 KB/S or 1 MB/S data rate (high density FDD)
1
250 KB/S or 300 KB/S data rate
In the PS/2 Model 30 mode, the bit definitions are as follows:
7
6
5
4
0
0
0
3
2
1
0
DRATE0
DRATE1
NOPREC
DMAEN
DSKCHG
DSKCHG (Bit 7):
This bit indicates the status of DSKCHG input.
Bit 6-4: These bits are always a logic 1 during a read.
DMAEN (Bit 3):
This bit indicates the value of DO REGISTER bit 3.
NOPREC (Bit 2):
This bit indicates the value of CC REGISTER NOPREC bit.
DRATE1 DRATE0 (Bit 1, 0):
These two bits select the data rate of the FDC.
-35-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
5.2.9
Configuration Control Register (CC Register) (Write base address + 7)
This register is used to control the data rate. In the PC/AT and PS/2 mode, the bit definitions are as
follows:
7
6
5
4
3
2
x
x
x
x
x
x
1
0
DRATE0
DRATE1
X: Reserved
Bit 7-2: Reserved. These bits should be set to 0.
DRATE1 DRATE0 (Bit 1, 0):
These two bits select the data rate of the FDC.
In the PS/2 Model 30 mode, the bit definitions are as follows:
7
6
5
4
3
X
X
X
X
X
2
1
0
DRATE0
DRATE1
NOPREC
X: Reserved
Bit 7-3: Reserved. These bits should be set to 0.
NOPREC (Bit 2):
This bit indicates no precompensation. It has no function and can be set by software.
DRATE1 DRATE0 (Bit 1, 0):
These two bits select the data rate of the FDC.
-36 -
W83877TF/W83877TG
6. UART PORT
6.1
Universal Asynchronous Receiver/Transmitter (UART A, UART B)
The UARTs are used to convert parallel data into serial format on the transmit side and convert serial
data to parallel format on the receiver side. The serial format, in order of transmission and reception,
is a start bit, followed by five to eight data bits, a parity bit (if programmed) and one, one and half (fivebit format only) or two stop bits. The UARTs are capable of handling divisors of 1 to 65535 and
producing a 16x clock for driving the internal transmitter logic. Provisions are also included to use this
16x clock to drive the receiver logic. The UARTs also support the MIDI data rate. Furthermore, the
UARTs also include complete modem control capability and a processor interrupt system that may be
software trailed to the computing time required to handle the communication link. The UARTs have a
FIFO mode to reduce the number of interrupts presented to the CPU. In each UART, there are 16byte FIFOs for both receive and transmit mode.
6.2
Register Address
TABLE 6-1 UART Register Bit Map
BIT NUMBER
REGISTER
ADDRESS BASE
0
1
2
3
4
5
6
7
RBR
Receiver
Buffer
BDLAB = 0
Register
(Read Only)
RX Data
RX Data
RX Data
RX Data
RX Data
RX Data
RX Data
RX Data
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Transmitter
Buffer
Register
(Write Only)
TBR
TX Data
TX Data
TX Data
TX Data
TX Data
TX Data
TX Data
TX Data
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Interrupt
Control
Register
ICR
USR
Interrupt
Enable
HSR
Interrupt
Enable
0
0
0
0
(EUSRI)
(EHSRI)
0
0
8
8
BDLAB = 0
9
BDLAB = 0
A
A
B
C
TBR
RBR Data
Empty
Ready
Interrupt
Interrupt
Enable
Enable
(ERDRI) (ETBREI)
FIFOs
FIFOs
Enabled
Enabled
**
**
Reserved Reversed
RX
Interrupt
Active
Level
(LSB)
RX
Interrupt
Active
Level
(MSB)
Even
Parity
Enable
Parity
Bit Fixed
Enable
Set
Silence
Enable
(PBE)
(EPE)
PBFE)
(SSE)
Baud rate
Divisor
Latch
Access Bit
(BDLAB)
IRQ
Enable
Internal
Loopback
Enable
0
0
"0" if
Interrupt
Pending
Interrupt
Status
Interrupt
Status
Interrupt
Status
Bit (0)
Bit (1)
Bit (2)**
UART FIFO UFR
Control
Register
(Write Only)
FIFO
Enable
RCVR
FIFO
Reset
XMIT
FIFO
Reset
DMA
Mode
Select
UCR
Data
Length
Select
Bit 0
(DLS0)
Data
Length
Select
Bit 1
(DLS1)
Multiple
Stop Bits
Enable
Parity
Bit
Enable
(MSBE)
Data
Terminal
Ready
(DTR)
Request
to
Send
(RTS)
Loopback
RI
Input
Interrupt
Status
Register
(Read Only)
UART
Control
Register
Handshake
Control
Register
ISR
HCR
-37-
0
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Register Address, continued.
BIT NUMBER
REGISTER
ADDRESS BASE
0
1
2
3
4
5
6
7
RBR Data
Ready
Overrun
Error
Parity Bit
Error
TSR
Empty
(OER)
(PBER)
Silent
Byte
Detected
(SBD)
TBR
Empty
(RDR)
No Stop
Bit
Error
(NSER)
(TBRE)
(TSRE)
RX FIFO
Error
Indication
(RFEI) **
CTS
Toggling
DSR
Toggling
RI Falling
Edge
DCD
Toggling
Clear
to Send
Data Set
Ready
Ring
Indicator
(TCTS)
(TDSR)
(FERI)
(TDCD)
(CTS)
(DSR)
(RI)
UART
Status
Register
USR
Handshake
Status
Register
HSR
F
User
Defined
Register
UDR
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
8
Baudrate
Divisor
Latch Low
BLL
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Baudrate
Divisor
Latch High
BHL
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15
D
E
BDLAB = 1
9
BDLAB = 1
Data
Carrier
Detect
(DCD)
*: Bit 0 is the least significant bit. The least significant bit is the first bit serially transmitted or received.
**: These bits are always 0 in 16450 mode.
6.2.1
UART Control Register (UCR) (Read/Write)
The UART Control Register controls and defines the protocol for asynchronous data communications,
including data length, stop bit, parity, and baud rate selection.
7
6
5
4
3
2
1
0
Data length select bit 0 (DLS0)
Data length select bit 1(DLS1)
Multiple stop bits enable (MSBE)
Parity bit enable (PBE)
Even parity enable (EPE)
Parity bit fixed enable (PBFE)
Set silence enable (SSE)
Baudrate divisor latch access bit (BDLAB)
Bit 7: BDLAB. When this bit is set to a logical 1, designers can access the divisor (in 16-bit binary
format) from the divisor latches of the baud rate generator during a read or write operation.
When this bit is reset, the Receiver Buffer Register, the Transmitter Buffer Register, or the
Interrupt Control Register can be accessed.
Bit 6: SSE. A logical 1 forces the Serial Output (SOUT) to a silent state (a logical 0). Only SOUT is
affected by this bit; the transmitter is not affected.
Bit 5: PBFE. When PBE and PBFE of UCR are both set to a logical 1,
(1) if EPE is a logical 1, the parity bit is fixed as a logical 0 to transmit and check.
(2) if EPE is a logical 0, the parity bit is fixed as a logical 1 to transmit and check.
-38 -
W83877TF/W83877TG
Bit 4: EPE. This bit describes the number of logic 1's in the data word bits and parity bit only when bit
3 is programmed. When this bit is set, an even number of logic 1's are sent or checked. When
the bit is reset, an odd number of logic 1's are sent or checked.
Bit 3: PBE. When this bit is set, the position between the last data bit and the stop bit of the SOUT will
be stuffed with the parity bit at the transmitter. For the receiver, the parity bit in the same
position as the transmitter will be detected.
Bit 2: MSBE. This bit defines the number of stop bits in each serial character that is transmitted or
received.
(1) If MSBE is set to a logical 0, one stop bit is sent and checked.
(2) If MSBE is set to a logical 1, and data length is 5 bits, one and a half stop bits are sent and
checked.
(3) If MSBE is set to a logical 1, and data length is 6, 7, or 8 bits, two stop bits are sent and
checked.
Bits 0 and 1: DLS0, DLS1. These two bits define the number of data bits that are sent or checked in
each serial character.
TABLE 6-2 WORD LENGTH DEFINITION
6.2.2
DLS1
DLS0
DATA LENGTH
0
0
5 bits
0
1
6 bits
1
0
7 bits
1
1
8 bits
UART Status Register (USR) (Read/Write)
This 8-bit register provides information about the status of the data transfer during communication.
7
6
5
4
3
2
1
0
RBR Data ready (RDR)
Overrun error (OER)
Parity bit error (PBER)
No stop bit error (NSER)
Silent byte detected (SBD)
Transmitter Buffer Register empty (TBRE)
Transmitter Shift Register empty (TSRE)
RX FIFO Error Indication (RFEI)
Bit 7: RFEI. In 16450 mode, this bit is always set to a logic 0. In 16550 mode, this bit is set to a logic 1
when there is at least one parity bit error, no stop bit error or silent byte detected in the FIFO. In
16550 mode, this bit is cleared by reading from the USR if there are no remaining errors left in
the FIFO.
-39-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Bit 6: TSRE. In 16450 mode, when TBR and TSR are both empty, this bit will be set to a logical 1. In
16550 mode, if the transmit FIFO and TSR are both empty, it will be set to a logical 1. Other
than these two cases, this bit will be reset to a logical 0.
Bit 5: TBRE. In 16450 mode, when a data character is transferred from TBR to TSR, this bit will be set
to a logical 1. If ETREI of ICR is a logical 1, an interrupt will be generated to notify the CPU to
write the next data. In 16550 mode, this bit will be set to a logical 1 when the transmit FIFO is
empty. It will be reset to a logical 0 when the CPU writes data into TBR or FIFO.
Bit 4: SBD. This bit is set to a logical 1 to indicate that received data are kept in silent state for a full
word time, including start bit, data bits, parity bit, and stop bits. In 16550 mode, it indicates the
same condition for the data on top of the FIFO. When the CPU reads USR, it will clear this bit
to a logical 0.
Bit 3: NSER. This bit is set to a logical 1 to indicate that the received data have no stop bit. In 16550
mode, it indicates the same condition for the data on top of the FIFO. When the CPU reads
USR, it will clear this bit to a logical 0.
Bit 2: PBER. This bit is set to a logical 1 to indicate that the parity bit of received data is wrong. In
16550 mode, it indicates the same condition for the data on top of the FIFO. When the CPU
reads USR, it will clear this bit to a logical 0.
Bit 1: OER. This bit is set to a logical 1 to indicate received data have been overwritten by the next
received data before they were read by the CPU. In 16550 mode, it indicates the same
condition instead of FIFO full. When the CPU reads USR, it will clear this bit to a logical 0.
Bit 0: RDR. This bit is set to a logical 1 to indicate received data are ready to be read by the CPU in
the RBR or FIFO. After no data are left in the RBR or FIFO, the bit will be reset to a logical 0.
6.2.3
Handshake Control Register (HCR) (Read/Write)
This register controls the pins of the UART used for handshaking peripherals such as modem, and
controls the diagnostic mode of the UART.
7
6
5
0
0
0
4
3
2
1
0
Data terminal ready (DTR)
Request to send (RTS)
Loopback RI input
IRQ enable
Internal loopback enable
Bit 4: When this bit is set to a logical 1, the UART enters diagnostic mode by an internal loopback, as
follows:
(1) SOUT is forced to a logical 1, and SIN is isolated from the communication link instead of
the TSR.
(2) Modem output pins are set to their inactive state.
(3) Modem input pins are isolated from the communication link and connect internally as DTR
(bit 0 of HCR) → DSR , RTS ( bit 1 of HCR) → CTS , Loopback RI input ( bit 2 of HCR) →
RI and IRQ enable ( bit 3 of HCR) → DCD .
Aside from the above connections, the UART operates normally. This method allows the
CPU to test the UART in a convenient way.
-40 -
W83877TF/W83877TG
Bit 3: The UART interrupt output is enabled by setting this bit to a logic 1. In the diagnostic mode this
bit is internally connected to the modem control input DCD .
Bit 2: This bit is used only in the diagnostic mode.
In the diagnostic mode this bit is internally
connected to the modem control input RI .
Bit 1: This bit controls the RTS output. The value of this bit is inverted and output to RTS .
Bit 0: This bit controls the DTR output. The value of this bit is inverted and output to DTR .
6.2.4
Handshake Status Register (HSR) (Read/Write)
This register reflects the current state of four input pins for handshake peripherals such as a modem
and records changes on these pins.
7
6
5
4
3
2
1
0
CTS toggling (TCTS)
DSR toggling (TDSR)
RI falling edge (FERI)
DCD toggling (TDCD)
Clear to send (CTS)
Data set ready (DSR)
Ring indicator (RI)
Data carrier detect (DCD)
Bit 7: This bit is the opposite of the DCD input. This bit is equivalent to bit 3 of HCR in loopback mode.
Bit 6: This bit is the opposite of the RI input. This bit is equivalent to bit 2 of HCR in loopback mode.
Bit 5: This bit is the opposite of the DSR input. This bit is equivalent to bit 0 of HCR in loopback mode.
Bit 4: This bit is the opposite of the CTS input. This bit is equivalent to bit 1 of HCR in loopback mode.
Bit 3: TDCD. This bit indicates that the DCD pin has changed state after HSR was read by the CPU.
Bit 2: FERI. This bit indicates that the RI pin has changed from low to high state after HSR was read
by the CPU.
Bit 1: TDSR. This bit indicates that the DSR pin has changed state after HSR was read by the CPU.
Bit 0: TCTS. This bit indicates that the CTS pin has changed state after HSR was read by the CPU.
-41-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
6.2.5
UART FIFO Control Register (UFR) (Write only)
This register is used to control the FIFO functions of the UART.
7
6
5
4
3
2
1
0
FIFO enable
Receiver FIFO reset
Transmitter FIFO reset
DMA mode select
Reserved
Reserved
RX interrupt active level (LSB)
RX interrupt active level (MSB)
Bit 6, 7: These two bits are used to set the active level for the receiver FIFO interrupt. For example, if
the interrupt active level is set as 4 bytes, once there are more than 4 data characters in the
receiver FIFO, the interrupt will be activated to notify the CPU to read the data from the FIFO.
TABLE 6-3 FIFO TRIGGER LEVEL
BIT 7
BIT 6
RX FIFO INTERRUPT ACTIVE LEVEL (BYTES)
0
0
01
0
1
04
1
0
08
1
1
14
Bit 4, 5: Reserved
Bit 3: When this bit is programmed to logic 1, the DMA mode will change from mode 0 to mode 1 if
UFR bit 0 = 1.
Bit 2: Setting this bit to a logical 1 resets the TX FIFO counter logic to initial state. This bit will clear to
a logical 0 by itself after being set to a logical 1.
Bit 1: Setting this bit to a logical 1 resets the RX FIFO counter logic to initial state. This bit will clear to
a logical 0 by itself after being set to a logical 1.
Bit 0: This bit enables the 16550 (FIFO) mode of the UART. This bit should be set to a logical 1 before
other bits of UFR are programmed.
-42 -
W83877TF/W83877TG
6.2.6
Interrupt Status Register (ISR) (Read only)
This register reflects the UART interrupt status, which is encoded by different interrupt sources into 3
bits.
7
6
5
4
0
0
3
2
1
0
0 if interrupt pending
Interrupt Status bit 0
Interrupt Status bit 1
Interrupt Status bit 2
FIFOs enabled
FIFOs enabled
Bit 7, 6: These two bits are set to a logical 1 when UFR bit 0 = 1.
Bit 5, 4: These two bits are always logic 0.
Bit 3: In 16450 mode, this bit is 0. In 16550 mode, both bit 3 and 2 are set to a logical 1 when a timeout interrupt is pending.
Bit 2, 1: These two bits identify the priority level of the pending interrupt, as shown in the table below.
Bit 0: This bit is a logical 1 if there is no interrupt pending. If one of the interrupt sources has occurred,
this bit will be set to a logical 0.
TABLE 6-4 INTERRUPT CONTROL FUNCTION
ISR
INTERRUPT SET AND FUNCTION
Bit
3
Bit
2
Bit
1
Bit
0
Interrupt
priority
0
0
0
1
-
0
1
1
0
First
0
1
0
0
Second
Interrupt Type
-
Interrupt Source
Clear Interrupt
No Interrupt pending
-
UART Receive
Status
1. OER = 1
2. PBER =1
Read USR
RBR Data Ready
1. RBR data ready
1. Read RBR
2. FIFO interrupt active level
reached
2. Read RBR until FIFO
data under active level
Read RBR
3. NSER = 1 4. SBD = 1
1
1
0
0
Second
FIFO Data Timeout
Data present in RX FIFO for 4
characters period of time since last
access of RX FIFO.
0
0
1
0
Third
TBR Empty
TBR empty
1. Write data into TBR
2. Read ISR (if priority is
third)
0
0
0
0
Fourth
Handshake status
1. TCTS = 1
2. TDSR = 1
3. FERI = 1
4. TDCD = 1
Read HSR
** Bit 3 of ISR is enabled when bit 0 of UFR is logical 1.
-43-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
6.2.7
Interrupt Control Register (ICR) (Read/Write)
This 8-bit register allows the five types of controller interrupts to activate the interrupt output signal
separately. The interrupt system can be totally disabled by resetting bits 0 through 3 of the Interrupt
Control Register (ICR). A selected interrupt can be enabled by setting the appropriate bits of this
register to a logical 1.
7
6
5
4
0
0
0
0
3
2
1
0
RBR data ready interrupt enable (ERDRI)
TBR empty interrupt enable (ETBREI)
UART receive status interrupt enable (EUSRI)
Handshake status interrupt enable (EHSRI)
Bit 7-4: These four bits are always logic 0.
Bit 3: EHSRI. Setting this bit to a logical 1 enables the handshake status register interrupt.
Bit 2: EUSRI. Setting this bit to a logical 1 enables the UART status register interrupt.
Bit 1: ETBREI. Setting this bit to a logical 1 enables the TBR empty interrupt.
Bit 0: ERDRI. Setting this bit to a logical 1 enables the RBR data ready interrupt.
6.2.8
Programmable Baud Generator (BLL/BHL) (Read/Write)
Two 8-bit registers, BLL and BHL, compose a programmable baud generator that uses 24 MHz to
generate a 1.8461 MHz frequency and divides it by a divisor from 1 to 216-1. The output frequency of
the baud generator is the baud rate multiplied by 16, and this is the base frequency for the transmitter
and receiver. The table below illustrates the use of the baud generator with a frequency of 1.8461
MHz. In high-speed UART mode (refer to CR0C bit7 and CR0C bit6), the programmable baud
generator directly uses 24 MHz and the same divisor as the normal speed divisor. In high-speed
mode, the data transmission rate can be as high as 1.5M bps.
-44 -
W83877TF/W83877TG
6.2.9
User-defined Register (UDR) (Read/Write)
This is a temporary register that can be accessed and defined by the user.
TABLE 6-5 BAUD RATE TABLE
BAUD RATE USING 24 MHZ TO GENERATE 1.8461 MHZ
DESIRED BAUD RATE
DECIMAL DIVISOR USED TO
GENERATE 16X CLOCK
PERCENT ERROR DIFFERENCE
BETWEEN DESIRED AND
ACTUAL
50
2304
**
75
1536
**
110
1047
0.18%
134.5
857
0.099%
150
768
**
300
384
**
600
192
**
1200
96
**
1800
64
**
2000
58
0.53%
2400
48
**
3600
32
**
4800
24
**
7200
16
**
9600
12
**
19200
6
**
38400
3
**
57600
2
**
115200
1
**
230400
4
Note 1
**
460800
2 Note 1
**
921600
1 Note 1
**
1.5M
1 Note 2
0%
Note 1: Only use in high speed mode, when FASTA/FASTB bits are set (refer to CR19 bit1 and CR19 bit0).
Note 2: Only use in high speed mode, when TURA/TURB bits are set (refer to CR0C bit7 and bit6).
** The percentage error for all baud rates, except where indicated otherwise, is 0.16%
-45-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7. PARALLEL PORT
7.1
Printer Interface Logic
The parallel port of the W83877TF/TG makes possible the attachment of various devices that accept
eight bits of parallel data at standard TTL level. W83877TF/TG supports an IBM XT/AT compatible
parallel port (SPP), bi-directional parallel port (BPP), Enhanced Parallel Port (EPP), Extended
Capabilities Parallel Port (ECP), Extension FDD mode (EXTFDD), and Extension 2FDD mode
(EXT2FDD) on the parallel port. Refer to the configuration registers for more information on disabling,
power-down, and on selecting the mode of operation.
Table 7-1 shows the pin definitions for different modes of the parallel port.
TABLE 7-1-A Parallel Port Connector and Pin Definition for SPP/EPP/ECP Modes
HOST
CONNECTOR
PIN NUMBER
OF W83877TF
PIN ATTRIBUTE
SPP
EPP
1
19
O
nSTB
nWrite
2-9
9-14,16-17
I/O
PD<0:7>
PD<0:7>
10
26
I
nACK
Intr
11
24
I
BUSY
nWait
12
27
I
PE
PE
ECP
nSTB, HostClk
PD<0:7>
nACK, PeriphClk
BUSY, PeriphAck2
PEerror,
nAckReverse2
13
28
I
SLCT
Select
SLCT, Xflag
14
20
O
nAFD
nDStrb
nAFD, HostAck2
15
29
I
nERR
nError
nFault1,
nPeriphRequest2
16
21
O
nINIT
nInit
17
22
O
nSLIN
nAStrb
Notes:
n<name > : Active Low
1. Compatible Mode
2. High Speed Mode
3. For more information, refer to the IEEE 1284 standard.
-46 -
nINIT1,
nReverseRqst2
nSLIN1 , ECPMode2
W83877TF/W83877TG
TABLE 7-1-B Parallel Port Connector and Pin Definition for EXTFDD and EXT2FDD Modes
HOST
CONNECTOR
PIN NUMBER
OF W83877TF
PIN
ATTRIBUTE
SPP
PIN
ATTRIBUTE
EXT2FDD
PIN
ATTRIBUTE
EXTFD
D
1
19
O
nSTB
---
---
---
---
2
9
I/O
PD0
I
INDEX2
I
INDEX2
3
10
I/O
PD1
I
TRAK02
I
4
11
I/O
PD2
I
WP2
I
5
12
I/O
PD3
I
RDATA2
I
RDATA2
6
13
I/O
PD4
I
DSKCHG2
I
DSKCHG
7
14
I/O
PD5
---
---
---
---
8
15
I/O
PD6
OD
MOA2
---
---
9
16
I/O
PD7
OD
DSA2
---
---
10
26
I
nACK
OD
DSB2
OD
11
24
I
BUSY
OD
MOB2
OD
12
27
I
PE
OD
WD2
OD
WD2
13
28
I
SLCT
OD
WE2
OD
WE2
14
20
O
nAFD
OD
RWC2
OD
RWC2
15
29
I
nERR
OD
NERR2
OD
16
21
O
nINIT
OD
DIR2
OD
17
22
O
nSLIN
OD
STEP2
OD
-47-
DIR2
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7.2
Enhanced Parallel Port (EPP)
TABLE 7-2 PRINTER MODE AND EPP REGISTER ADDRESS
A2
A1
A0
REGISTER
NOTE
0
0
0
Data port (R/W)
1
0
0
1
Printer status buffer (Read)
1
0
1
0
Printer control latch (Write)
1
0
1
0
Printer control swapper (Read)
1
0
1
1
EPP address port (R/W)
2
1
0
0
EPP data port 0 (R/W)
2
1
0
1
EPP data port 1 (R/W)
2
1
1
0
EPP data port 2 (R/W)
2
1
1
1
EPP data port 2 (R/W)
2
Notes:
1. These registers are available in all modes.
2. These registers are available only in EPP mode.
7.2.1
Data Swapper
The system microprocessor can read the contents of the printer's data latch by reading the data
swapper.
7.2.2
Printer Status Buffer
The system microprocessor can read the printer status by reading the address of the printer status
buffer. The bit definitions are as follows:
7
6
5
4
3
2
1
1
1
0
TMOUT
ERROR
SLCT
PE
ACK
BUSY
Bit 7: This signal is active during data entry, when the printer is off-line during printing, when the print
head is changing position, or during an error state. When this signal is active, the printer is busy
and cannot accept data.
Bit 6: This bit represents the current state of the printer's ACK signal. A 0 means the printer has
received a character and is ready to accept another. Normally, this signal will be active for
approximately 5 microseconds before BUSY stops.
Bit 5: A 1 means the printer has detected the end of paper.
Bit 4: A 1 means the printer is selected.
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W83877TF/W83877TG
Bit 3: A 0 means the printer has encountered an error condition.
Bit 1, 2: These two bits are not implemented and are logic one during a read of the status register.
Bit 0: This bit is valid in EPP mode only. It indicates that a 10 μS time-out has occurred on the EPP
bus. A logic 0 means that no time-out error has occurred; a logic 1 means that a time-out error
has been detected. Writing a logic 1 to this bit will clear the time-out status bit; writing a logic 0
has no effect.
7.2.3
Printer Control Latch and Printer Control Swapper
The system microprocessor can read the contents of the printer control latch by reading the printer
control swapper. Bit definitions are as follows:
7
6
1
1
5
4
3
2
1
0
STROBE
AUTO FD
INIT
SLCT IN
IRQ ENABLE
DIR
Bit 7, 6: These two bits are a logic one during a read. They can be written.
Bit 5: Direction control bit
When this bit is a logic 1, the parallel port is in input mode (read); when it is a logic 0, the
parallel port is in output mode (write). This bit can be read and written. In SPP mode, this bit is
invalid and fixed at zero.
Bit 4: A 1 in this position allows an interrupt to occur when ACK changes from low to high.
Bit 3: A 1 in this bit position selects the printer.
Bit 2: A 0 starts the printer (50 microsecond pulse, minimum).
Bit 1: A 1 causes the printer to line-feed after a line is printed.
Bit 0: A 0.5 microsecond minimum high active pulse clocks data into the printer. Valid data must be
present for a minimum of 0.5 microseconds before and after the strobe pulse.
7.2.4
EPP Address Port
The address port is available only in EPP mode. Bit definitions are as follows:
7
6
5
4
3
2
1
0
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
The contents of DB0-DB7 are buffered (non-inverting) and output to ports PD0-PD7 during a write
operation. The leading edge of IOW causes an EPP address write cycle to be performed, and the
trailing edge of IOW latches the data for the duration of the EPP write cycle.
PD0-PD7 ports are read during a read operation. The leading edge of IOR causes an EPP address
read cycle to be performed and the data to be output to the host CPU.
7.2.5
EPP Data Port 0-3
These four registers are available only in EPP mode. Bit definitions of each data port are as follows:
7
6
5
4
3
2
1
0
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
When accesses are made to any EPP data port, the contents of DB0-DB7 are buffered (non-inverting)
and output to the ports PD0-PD7 during a write operation. The leading edge of IOW causes an EPP
data write cycle to be performed, and the trailing edge of IOW latches the data for the duration of the
EPP write cycle.
During a read operation, ports PD0-PD7 are read, and the leading edge of IOR causes an EPP read
cycle to be performed and the data to be output to the host CPU.
7.2.6
Bit Map of Parallel Port and EPP Registers
REGISTER
7
6
5
4
3
2
1
0
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
BUSY
ACK
PE
SLCT
ERROR
1
1
TMOUT
Control Swapper
(Read)
1
1
1
IRQEN
SLIN
INIT
AUTOFD
STROBE
Control Latch (Write)
1
1
DIR
IRQ
SLIN
INIT
AUTOFD
STROBE
EPP Address Port
(R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 0 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 1
(R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 2 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
EPP Data Port 3 (R/W)
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Data Port (R/W)
Status Buffer (Read)
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W83877TF/W83877TG
7.2.7
EPP Pin Descriptions
EPP NAME
TYPE
EPP DESCRIPTION
nWrite
O
Denotes an address or data read or write operation.
PD<0:7>
I/O
Bi-directional EPP address and data bus.
Intr
I
Used by peripheral device to interrupt the host.
nWait
I
Inactive to acknowledge that data transfer is completed. Active to indicate
that the device is ready for the next transfer.
PE
I
Paper end; same as SPP mode.
Select
I
Printer selected status; same as SPP mode.
nDStrb
O
This signal is active low. It denotes a data read or write operation.
nError
I
Error; same as SPP mode.
nInits
O
This signal is active low. When it is active, the EPP device is reset to its
initial operating mode.
nAStrb
O
This signal is active low. It denotes an address read or write operation.
7.2.8
EPP Operation
When the EPP mode is selected in the configuration register, the standard and bi-directional modes
are also available. The PDx bus is in the standard or bi-directional mode when no EPP read, write, or
address cycle is currently being executed. In this condition all output signals are set by the SPP
Control Port and the direction is controlled by DIR of the Control Port.
A watchdog timer is required to prevent system lockup. The timer indicates that more than 10 μS have
elapsed from the start of the EPP cycle to the time WAIT is de-asserted. The current EPP cycle is
aborted when a time-out occurs. The time-out condition is indicated in Status bit 0.
EPP Operation
The EPP operates on a two-phase cycle. First, the host selects the register within the device for
subsequent operations. Second, the host performs a series of read and/or write byte operations to the
selected register. Four operations are supported on the EPP: Address Write, Data Write, Address
Read, and Data Read. All operations on the EPP device are performed synchronously.
EPP Version 1.9 Operation
The EPP read/write operation can be completed under the following conditions:
a. If the nWait is active low, when the read cycle (nWrite inactive high, nDStrb/nAStrb active low) or
write cycle (nWrite active low, nDStrb/nAStrb active low) starts, the read/write cycle proceeds normally
and will be completed when nWait goes inactive high.
b. If nWait is inactive high, the read/write cycle will not start. It must wait until nWait changes to active
low, at which time it will start as described above.
EPP Version 1.7 Operation
The EPP read/write cycle can start without checking whether nWait is active or inactive. Once the
read/write cycle starts, however, it will not terminate until nWait changes from active low to inactive
high.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7.3
Extended Capabilities Parallel (ECP) Port
This port is software and hardware compatible with existing parallel ports, so it may be used as a
standard printer mode if ECP is not required. It provides an automatic high burst-bandwidth channel
that supports DMA for ECP in both the forward (host to peripheral) and reverse (peripheral to host)
directions.
Small FIFOs are used in both forward and reverse directions to improve the maximum bandwidth
requirement. The size of the FIFO is 16 bytes. The ECP port supports an automatic handshake for the
standard parallel port to improve compatibility mode transfer speed.
The ECP port supports run-length-encoded (RLE) decompression (required) in the hardware.
Compression is accomplished by counting identical bytes and transmitting an RLE byte that indicates
how many times the next byte is to be repeated. The hardware support for compression is optional.
For more information about the ECP Protocol, refer to the Extended Capabilities Port Protocol and ISA
Interface Standard.
7.3.1
ECP Register and Mode Definitions
NAME
ADDRESS
I/O
ECP MODES
FUNCTION
data
Base+000h
R/W
000-001
ecpAFifo
Base+000h
R/W
011
ECP FIFO (Address)
dsr
Base+001h
R
All
Status Register
dcr
Base+002h
R/W
All
Control Register
cFifo
Base+400h
R/W
010
Parallel Port Data FIFO
ecpDFifo
Base+400h
R/W
011
ECP FIFO (DATA)
tFifo
Base+400h
R/W
110
Test FIFO
cnfgA
Base+400h
R
111
Configuration Register A
cnfgB
Base+401h
R/W
111
Configuration Register B
ecr
Base+402h
R/W
All
Extended Control Register
Data Register
Note: The base addresses are specified by CR23, which are determined by configuration register or hardware setting.
MODE
DESCRIPTION
000
SPP mode
001
PS/2 Parallel Port mode
010
Parallel Port Data FIFO mode
011
ECP Parallel Port mode
100
EPP mode (If this option is enabled in the CR9 and CR0 to select ECP/EPP mode)
101
Reserved
110
Test mode
111
Configuration mode
Note: The mode selection bits are bit 7-5 of the Extended Control Register.
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W83877TF/W83877TG
7.3.2
Data and ecpAFifo Port
Modes 000 (SPP) and 001 (PS/2) (Data Port)
During a write operation, the Data Register latches the contents of the data bus on the rising edge of
the input. The contents of this register are output to the PD0-PD7 ports. During a read operation, ports
PD0-PD7 are read and output to the host. The bit definitions are as follows:
7
6
5
4
3
2
1
0
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
Mode 011 (ECP FIFO-Address/RLE)
A data byte written to this address is placed in the FIFO and tagged as an ECP Address/RLE. The
hardware at the ECP port transmits this byte to the peripheral automatically. The operation of this
register is defined only for the forward direction. The bit definitions are as follows:
7
6
5
4
3
2
1
0
Address or RLE
Address/RLE
7.3.3
Device Status Register (DSR)
These bits are at low level during a read of the Printer Status Register. The bits of this status register
are defined as follows:
7
6
5
4
3
2
1
1
0
1
1
nFault
Select
PError
nAck
nBusy
Bit 7: This bit reflects the complement of the Busy input.
Bit 6: This bit reflects the nAck input.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Bit 5: This bit reflects the PError input.
Bit 4: This bit reflects the Select input.
Bit 3: This bit reflects the nFault input.
Bit 2-0: These three bits are not implemented and are always logic one during a read.
7.3.4
Device Control Register (DCR)
The bit definitions are as follows:
7
1
6
5
4
3
2
1
0
1
Strobe
Autofd
nInit
Select In
AckInt En
Direction
Bit 6, 7: These two bits are logic one during a read and cannot be written.
Bit 5: This bit has no effect and the direction is always out if mode = 000 or mode = 010. Direction is
valid in all other modes.
0 the parallel port is in output mode.
1 the parallel port is in input mode.
Bit 4: Interrupt request enable. When this bit is set to a high level, it may be used to enable interrupt
requests from the parallel port to the CPU due to a low to high transition on the ACK input.
Bit 3: This bit is inverted and output to the SLIN output.
0
The printer is not selected.
1
The printer is selected.
Bit 2: This bit is output to the INIT output.
Bit 1: This bit is inverted and output to the AFD output.
Bit 0: This bit is inverted and output to the STB output.
7.3.5
cFifo (Parallel Port Data FIFO) Mode = 010
This mode is defined only for the forward direction. The standard parallel port protocol is used by a
hardware handshake to the peripheral to transmit bytes written or DMAed from the system to this
FIFO. Transfers to the FIFO are byte aligned.
7.3.6
ecpDFifo (ECP Data FIFO) Mode = 011
When the direction bit is 0, bytes written or DMAed from the system to this FIFO are transmitted by a
hardware handshake to the peripheral using the ECP parallel port protocol. Transfers to the FIFO are
byte aligned.
When the direction bit is 1, data bytes from the peripheral are read under automatic hardware
handshake from ECP into this FIFO. Reads or DMAs from the FIFO will return bytes of ECP data to
the system.
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W83877TF/W83877TG
7.3.7
tFifo (Test FIFO Mode) Mode = 110
Data bytes may be read, written, or DMAed to or from the system to this FIFO in any direction.
Data in the tFIFO will not be transmitted to the parallel port lines. However, data in the tFIFO may be
displayed on the parallel port data lines.
7.3.8
cnfgA (Configuration Register A) Mode = 111
This register is a read-only register. When it is read, 10H is returned. This indicates to the system that
this is an 8-bit implementation.
7.3.9
cnfgB (Configuration Register B) Mode = 111
The bit definitions are as follows:
7
6
5
4
3
2
1
0
1
1
1
IRQx 0
IRQx 1
IRQx 2
intrValue
compress
Bit 7: This bit is read-only. It is at low level during a read. This means that this chip does not support
hardware RLE compression.
Bit 6: Returns the value on the ISA IRQ line to determine possible conflicts.
Bit 5-3: Reflect the IRQ resource assigned for ECP port.
CNFGB[5:3]
000
001
010
011
100
101
110
111
IRQ RESOURCE
reflect other IRQ resources selected by PnP register (default)
IRQ7
IRQ9
IRQ10
IRQ11
IRQ14
IRQ15
IRQ5
Bit 2-0: These five bits are at high level during a read and can be written.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7.3.10
ecr (Extended Control Register) Mode = all
This register controls the extended ECP parallel port functions. The bit definitions are follows:
7
6
5
4
3
2
1
0
Empty
Full
Service Intr
DMA En
nErrIntr En
MODE
MODE
MODE
Bit 7-5: These bits are read/write and select the mode.
000
Standard Parallel Port mode. The FIFO is reset in this mode.
001
PS/2 Parallel Port mode. This is the same as 000 except that direction may be used
to tri-state the data lines and reading the data register returns the value on the data
lines and not the value in the data register.
010
Parallel Port FIFO mode. This is the same as 000 except that bytes are written or
DMAed to the FIFO. FIFO data are automatically transmitted using the standard
parallel port protocol. This mode is useful only when direction is 0.
011
ECP Parallel Port Mode. When the direction is 0 (forward direction), bytes placed
into the ecpDFifo and bytes written to the ecpAFifo are placed in a single FIFO and
transmitted automatically to the peripheral using ECP Protocol. When the direction
is 1 (reverse direction) bytes are moved from the ECP parallel port and packed into
bytes in the ecpDFifo.
100
Selects EPP Mode. In this mode, EPP is active if the EPP supported option is
selected.
101
Reserved.
110
Test Mode. The FIFO may be written and read in this mode, but the data will not be
transmitted on the parallel port.
111
Configuration Mode. The confgA and confgB registers are accessible at 0x400 and
0x401 in this mode.
Bit 4: Read/Write (Valid only in ECP Mode)
1
Disables the interrupt generated on the asserting edge of nFault.
0
Enables an interrupt pulse on the high to low edge of nFault. If nFault is asserted
(interrupt) an interrupt will be generated and this bit is written from a 1 to 0.
Bit 3: Read/Write
1
0
Enables DMA.
Disables DMA unconditionally.
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W83877TF/W83877TG
Bit 2: Read/Write
1
0
Disables DMA and all of the service interrupts.
Enables one of the following cases of interrupts. When one of the service interrupts
has occurred, the serviceIntr bit is set to a 1 by hardware. This bit must be reset to
0 to re-enable the interrupts. Writing a 1 to this bit will not cause an interrupt.
(a) dmaEn = 1:
During DMA this bit is set to a 1 when terminal count is reached.
(b) dmaEn = 0 direction = 0:
This bit is set to 1 whenever there are writeIntr Threshold or more bytes free in the
FIFO.
(c) dmaEn = 0 direction = 1:
This bit is set to 1 whenever there are readIntr Threshold or more valid bytes to be
read from the FIFO.
Bit 1: Read only
0
1
The FIFO has at least 1 free byte.
The FIFO cannot accept another byte or the FIFO is completely full.
Bit 0: Read only
0
1
7.3.11
The FIFO contains at least 1 byte of data.
The FIFO is completely empty.
Bit Map of ECP Port Registers
Data
ecpAFifo
Dsr
Dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
Ecr
D7
D6
D5
D4
D3
D2
D1
D0
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Addr/RLE
Address or RLE field
NOTE
2
nBusy
nAck
PError
Select
nFault
1
1
1
1
1
1
Directio
ackIntEn
SelectIn
nInit
autofd
strobe
1
Parallel Port Data FIFO
2
ECP Data FIFO
2
Test FIFO
2
0
0
0
1
0
0
0
0
compress
intrValue
1
1
1
1
1
1
nErrIntrEn
dmaEn
serviceIntr
full
empty
MODE
Notes:
1. These registers are available in all modes.
2. All FIFOs use one common 16-byte FIFO.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7.3.12
ECP Pin Descriptions
NAME
TYPE
DESCRIPTION
nStrobe (HostClk)
O
The nStrobe registers data or address into the slave on the
asserting edge during write operations. This signal
handshakes with Busy.
PD<7:0>
I/O
These signals contains address or data or RLE data.
nAck (PeriphClk)
I
This signal indicates valid data driven by the peripheral when
asserted. This signal handshakes with nAutofd in reverse.
Busy (PeriphAck)
I
This signal desserts to indicate that the peripheral can accept
data. It indicates whether the data lines contain ECP
command information or data in the reverse direction. When in
reverse direction, normal data are transferred when Busy
(PeriphAck) is high and an 8-bit command is transferred when
it is low.
PError (nAckReverse)
I
This signal is used to acknowledge a change in the direction
of the transfer (asserted = forward). The peripheral drives this
signal low to acknowledge nReverseRequest. The host relies
upon nAckReverse to determine when it is permitted to drive
the data bus.
Select (Xflag)
I
Indicates printer on line.
nAutoFd (HostAck)
O
Requests a byte of data from the peripheral when it is
asserted. This signal indicates whether the data lines contain
ECP address or data in the forward direction. When in forward
direction, normal data are transferred when nAutoFd
(HostAck) is high and an 8-bit command is transferred when it
is low.
nFault (nPeriphRequest)
I
Generates an error interrupt when it is asserted. This signal is
valid only in the forward direction. The peripheral is permitted
(but not required) to drive this pin low to request a reverse
transfer during ECP Mode.
nInit (nReverseRequest)
O
This signal sets the transfer direction (asserted = reverse,
deasserted = forward). This pin is driven low to place the
channel in the reverse direction.
nSelectIn (ECPMode)
O
This signal is always deasserted in ECP mode.
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W83877TF/W83877TG
7.3.13
ECP Operation
The host must negotiate on the parallel port to determine if the peripheral supports the ECP protocol
before ECP operation. After negotiation, it is necessary to initialize some of the port bits. The following
are required:
(a) Set direction = 0, enabling the drivers.
(b) Set strobe = 0, causing the nStrobe signal to default to the deasserted state.
(c) Set autoFd = 0, causing the nAutoFd signal to default to the deasserted state.
(d) Set mode = 011 (ECP Mode)
ECP address/RLE bytes or data bytes may be sent automatically by writing the ecpAFifo or ecpDFifo,
respectively.
Mode Switching
Software will execute P1284 negotiation and all operations prior to a data transfer phase under
programmed I/O control (mode 000 or 001). Hardware provides an automatic control line handshake,
moving data between the FIFO and the ECP port only in the data transfer phase (mode 011 or 010).
If the port is in mode 000 or 001 it may switch to any other mode. If the port is not in mode 000 or 001
it can only be switched into mode 000 or 001. The direction can be changed only in mode 001.
When in extended forward mode, the software should wait for the FIFO to be empty before switching
back to mode 000 or 001. In ECP reverse mode the software waits for all the data to be read from the
FIFO before changing back to mode 000 or 001.
Command/Data
ECP mode allows the transfer of normal 8-bit data or 8-bit commands. In the forward direction, normal
data are transferred when HostAck is high and an 8-bit command is transferred when HostAck is low.
The most significant bits of the command indicate whether it is a run-length count (for compression) or
a channel address.
In the reverse direction, normal data are transferred when PeriphAck is high and an 8-bit command is
transferred when PeriphAck is low. The most significant bit of the command is always zero.
Data Compression
The W83877TF/TG supports run length encoded (RLE) decompression in hardware and can transfer
compressed data to a peripheral. Note that the odd (RLE) compression in hardware is not supported.
In order to transfer data in ECP mode, the compression count is written to the ecpAFifo and the data
byte is written to the ecpDFifo.
7.3.14
FIFO Operation
The FIFO threshold is set in configuration register 5. All data transfers to or from the parallel port can
proceed in DMA or Programmed I/O (non-DMA) mode, as indicated by the selected mode. The FIFO
is used by selecting the Parallel Port FIFO mode or ECP Parallel Port Mode. After a reset, the FIFO is
disabled.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7.3.15
DMA Transfers
DMA transfers are always to or from the ecpDFifo, tFifo, or CFifo. The DMA uses the standard PC
DMA services. The ECP requests DMA transfers from the host by activating the PDRQ pin. The DMA
will empty or fill the FIFO using the appropriate direction and mode. When the terminal count in the
DMA controller is reached, an interrupt is generated and serviceIntr is asserted, which will disable the
DMA.
7.3.16
Programmed I/O (NON-DMA) Mode
The ECP or parallel port FIFOs can also be operated using interrupt driven programmed I/O.
Programmed I/O transfers are to the ecpDFifo at 400H and ecpAFifo at 000H or from the ecpDFifo
located at 400H, or to/from the tFifo at 400H. The host must set the direction, state, dmaEn = 0 and
serviceIntr = 0 in the programmed I/O transfers.
The ECP requests programmed I/O transfers from the host by activating the IRQ pin. The
programmed I/O will empty or fill the FIFO using the appropriate direction and mode.
7.4
Extension FDD Mode (EXTFDD)
In this mode, the W83877TF/TG changes the printer interface pins to FDC input/output pins, allowing
the user to install a second floppy disk drive (FDD B) through the DB-25 printer connector. The pin
assignments for the FDC input/output pins are shown in Table 8-1.
After the printer interface is set to EXTFDD mode, the following occur:
(1) Pins MOB and DSB will be forced to inactive state.
(2) Pins DSKCHG , RDATA , WP , TRAK0 , INDEX will be logically ORed with pins PD4-PD0 to
serve as input signals to the FDC.
(3) Pins PD4-PD0 each will have an internal resistor of about 1K ohm to serve as pull-up resistor for
FDD open drain/collector output.
(4) If the parallel port is set to EXTFDD mode after the system has booted DOS or another operating
system, a warm reset is needed to enable the system to recognize the extension floppy drive.
7.5
Extension 2FDD Mode (EXT2FDD)
In this mode, the W83877TF/TG changes the printer interface pins to FDC input/output pins, allowing
the user to install two external floppy disk drives through the DB-25 printer connector to replace
internal floppy disk drives A and B. The pin assignments for the FDC input/output pins are shown in
Table 8-1.
After the printer interface is set to EXTFDD mode, the following occur:
(1) Pins MOA , DSA , MOB , and DSB will be forced to inactive state.
(2) Pins DSKCHG , RDATA , WP , TRAK0 , and INDEX will be logically ORed with pins PD4-PD0 to
serve as input signals to the FDC.
(3) Pins PD4-PD0 each will have an internal resistor of about 1K ohm to serve as pull-up resistor for
FDD open drain/collector output.
(4) If the parallel port is set to EXT2FDD mode after the system has booted DOS or another operating
system, a warm reset is needed to enable the system to recognize the extension floppy drive.
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W83877TF/W83877TG
8. PLUG AND PLAY CONFIGURATION
A powerful new plug-and-play function has been built into the W83877TF/TG to help simplify the task
of setting up a computer environment. With appropriate support from BIOS manufacturers, the system
designer can freely allocate Winbond I/O devices (i.e., the FDC, PRT and UART ) in the PC's I/O
space (100H - 3FFH). In addition, the W83877TF/TG also provides 8 interrupt requests and 3 DMA
pairs for designers to assign in interfacing FDCs, UARTs, and PRTs. Hence this powerful I/O chip
offers greater flexibility for system designers.
The PnP feature is implemented through a set of Extended Function Registers (CR20 to 29). Details
on configuring these registers are given in Section 11. The default values of these PnP-related
registers set the system to a configuration compatible with environments designed with previous
Winbond I/O chips.
9. ACPI /LEGACY FEATURE AND AUTO POWER MANAGEMENT
9.1
ACPI/Legacy power management
W83877TF/TG supports both ACPI and legacy power management models. For the ACPI power
management, the SCI pin is dedicated to the SCI interrupt signal for the SCI interrupt handler; For the
legacy power management, the SMI pin is dedicated to the SMI interrupt signal for the SMI interrupt
handler.
Two register blocks is used for the ACPI/Legacy power management. They are the PM1 and GPE
register blocks. Their base addresses are held in the W83877TF/TG configuration registers CR33 and
CR34 respectively. Configuration registers CR40 to CR45 are for the legacy power management. The
above configuration registers hold the interrupt event enable and status bits of the SMI interrupts.
Control over the routing of SCI and SMI interrupts to the output pins is also contained in the above
registers.
One 24-bit power management timer is also implemented. It provides an accurate time value used by
the system software to measure and profiles system idleness.
9.2
Device(auto) power management
W83877TF/TG also provides the auto power management function for each device within it. They are
the printer port, FDC, UART A, and UART B devices in W83877TF/TG respectively. Device idle and
trap status are provided to indicate the device's working/sleeping state. Device idle timer with
programmable initial value is provided for each device, which enter the powerdown state when the
powerdown conditions are met. Any access to certain registers and external event input will wake up
the devices. The global stand-by timer deals with the other logic part excluding the printer port, FDC,
UART A , and UART B devices. The global stand-by timer reloads and counts down as soon as the 4
devices enter the powerdown mode and W83877TF/TG enters the powerdown mode as soon as it
expires. Once any device is awakened, the global stand-by is also awakened. The initial count values
of the devices are held in the configuration registers CR35 to CR39.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
10. SERIAL IRQ
W83877TF/TG supports a serial IRQ scheme. This allow a signal line to be used to report the legacy
ISA interrupt requests. Because more than one device may need to share the signal serial IRQ signal
line, an open drain signal scheme is used. The clock source is the PCI clock. The serial interrupt is
transferred on the IRQSER signal, one cycle consisting of three frames types: a start frame, several
IRQ/Data frame, and one Stop frame. The serial interrupt scheme adheres to the Serial IRQ
Specification for PCI System, Version 6.0.
Timing Diagrams For IRQSER Cycle
Start Frame timing with source sampled a low pulse on IRQ1
START FRAME
SL
or
H
IRQ0 FRAME
H
R
T
S
R
IRQ1 FRAME
T
S
R
IRQ2 FRAME
T
S
R
T
PCICLK
IRQSER
1
START
Drive Source
Host Controller
IRQ1
H=Host Control
None
SL=Slave Control
R=Recovery
IRQ1
None
T=Turn-around
S=Sample
1. Start Frame pulse can be 4-8 clocks wide.
Stop Frame Timing with Host using 17 IRQSER sampling period
IRQ14
FRAME
S
R
IRQ15
FRAME
T
S
R
IOCHCK
FRAME
T
S
R
T
2
I
STOP FRAME
H
NEXT CYCLE
R
T
PCICLK
1
STOP
IRQSER
Drive
None
H=Host Control
IRQ15
R=Recovery
None
T=Turn-around
3
START
Host Controller
S=Sample
1. Stop pulse is 2 clocks wide for Quiet mode, 3 clocks wide for Continuous mode.
2. There may be none, one or more Idle states during the Stop Frame.
3. The next IRQSER cycle's Start Frame pulse may or may not start immediately after the turn-around clock of the Stip Frame.
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I=Idle
W83877TF/W83877TG
10.1 Start Frame
There are two modes of operation for the IRQSER Start frame: Quiet mode and Continuous mode.
In the Quiet mode, the peripheral drives the SERIRQ signal active low for one clock, and then tristates it. This brings all the states machines of the peripherals from idle to active states. the host
controller will then take over driving IRQSER signal low in the next clock and will continue driving the
IRQSER low for programmable 3 to 7 clock periods. This makes the total number of clocks low for 4 to
8 clock periods. After these clocks, the host controller will drive the IRQSER high for one clock and
then tri-stated.
In the Continuous mode, only the host controller initiates the START frame to update IRQ/Data line
information. The host controller drives the IRQSER signal low for 4 to 8 period clocks. Upon reset, the
IRQSER signal is defaulted to the Continuous mode for the host controller to initiate the first Start
frame.
10.2 IRQ/Data Frame
Once the start frame has been initiated, all the peripherals must start counting frames based on the
rising edge of the start pulse. Each IRQ/Data Frame is three clocks: Sample phase, Recovery phase,
and Turn-around phase.
During the Sample phase, the peripheral drives SERIRQ low if the corresponding IRQ should be
active. If the corresponding IRQ is inactive, then IRQSER must be left tri-stated. During the Recovery
phase, the peripheral device drives the IRQSER high. During the Turn-around phase, the peripheral
device left the IRQSER tri-stated.
The IRQ/Data Frame has a number of specific order, as shown in Table 10-1.
Table 10-1 IRQSER Sampling periods
IRQ/DATA FRAME
SIGNAL SAMPLED
# OF CLOCKS PAST START
1
IRQ0
2
2
IRQ1
5
3
SMI
8
4
IRQ3
11
5
IRQ4
14
6
IRQ5
17
7
IRQ6
20
8
IRQ7
23
9
IRQ8
26
10
IRQ9
29
11
IRQ10
32
12
IRQ11
35
13
IRQ12
38
14
IRQ13
41
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
IRQ/Data Frame, continued
IRQ/DATA FRAME
SIGNAL SAMPLED
# OF CLOCKS PAST START
15
IRQ14
44
16
IRQ15
47
17
IOCHCK
50
18
INTA
53
19
INTB
56
20
INTC
59
21
INTD
62
32:22
Unassigned
95
10.3 Stop Frame
After all IRQ/Data Frames have completed , the host controller will terminate IRQSER by a Stop
frame. Only the host controller can initiate the Stop frame by driving IRQSER low for 2 or 3 clocks. If
the Stop Frame is low for 2 clocks, the next IRQSER cycle's Sample mode is the Quiet mode. If the
Stop Frame is low for 3 clocks, the next IRQSER cycle's Sample mode is the Continuous mode.
10.4 Reset and Initialization
After MR reset, IRQSER Slaves are put into the Continuous(Idle) mode. The Host Controller is
responsible for starting the initial IRQSER Cycle to collect system's IRQ/Data default values. The
system then follows with the Continuous/Quiet mode protocol (Stop Frame pulse width) for
subsequent IRQSER cycles. It's the Host Controller's responsibility to provide the default values to
8259's and other system logic before the first IRQSER cycle is performed. For IRQSER system
suspend, insertion, or removal application, the Host controller should be programmed into
Continuous(Idle) mode first. This is to guarantee IRQSER bus in the Idle state before the system
configuration changes.
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W83877TF/W83877TG
11. EXTENDED FUNCTION REGISTERS
The W83877TF/TG provides many configuration registers for setting up different types of
configurations. After power-on reset, the state of the hardware setting of each pin will be latched by
the relevant configuration register to allow the W83877TF/TG to enter the proper operating
configuration. To protect the chip from invalid reads or writes, the configuration registers cannot be
accessed by the user. There are four ways to enable the configuration.
n registers to be read or written. HEFERE (CR0C bit 5) and HEFRAS (CR16 bit 0) can be used to
select one out of these four methods of entering the Extended Function mode as follows:
HEFRAS
HEFERE
ADDRESS AND VALUE
0
0
write 88H to the location 250H
0
1
write 89H to the location 250H (power-on default)
1
0
write 86H to the location 3F0H twice
1
1
write 87H to the location 3F0H twice
First, a specific value must be written once (88H/89H) or twice (86H/87H) to the Extended Functions
Enable Register (I/O port address 250H or 3F0H). Second, an index value (00H-19H, 20H-29H, 2CH2DH, 31H-3AH, 40H-45H) must be written to the Extended Functions Index Register (I/O port address
251H or 3F0H) to identify which configuration register is to be accessed. The designer can then
access the desired configuration register through the Extended Functions Data Register (I/O port
address 252H or 3F1H).
After programming of the configuration register is finished, an additional value should be written to
EFERs to exit the Extended Function mode to prevent unintentional access to those configuration
registers. In the case of EFER at 250H, this additional value can be any value other than 88H if
HEFERE = 0 and 89H if HEFERE = 1. While EFER is at 3F0H, this additional value must be AAH. The
designer can also set bit 6 of CR9 (LOCKREG) to high to protect the configuration registers against
accidental accesses.
The configuration registers can be reset to their default or hardware settings only by a cold reset (pin
MR = 1). A warm reset will not affect the configuration registers.
11.1 Extended Functions Enable Registers (EFERs)
After a power-on reset, the W83877TF/TG enters the default operating mode. Before the
W83877TF/TG enters the extended function mode, a specific value must be programmed into the
Extended Function Enable Register (EFER) so that the extended function register can be accessed.
The Extended Function Enable Registers are write-only registers. On a PC/AT system, their port
addresses are 250H or 3F0H (as described in the above section).
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.2 Extended Function Index Registers (EFIRs), Extended Function Data
Registers(EFDRs)
After the extended function mode is entered, the Extended Function Index Register (EFIR) must be
loaded with an index value (0H, 1H, 2H, ..., or 29H) to access Configuration Register 0 (CR0),
Configuration Register 1 (CR1), Configuration Register 2 (CR2), and so forth through the Extended
Function Data Register (EFDR). The EFIRs are write-only registers with port address 251H or 3F0H
(as described in section 11.0) on PC/AT systems; the EFDRs are read/write registers with port
address 252H or 3F1H (as described in section 11.0) on PC/AT systems. The function of each
configuration register is described below.
11.2.1
Configuration Register 0 (CR0), default = 00H
When the device is in Extended Function mode and EFIR is 0H, the CR0 register can be accessed
through EFDR. The bit definitions for CR0 are as follows:
7
6
5
4
3
2
1
0
IPD
reserved
PRTMODS0
PRTMODS1
reserved
reserved
reserved
reserved
Bit 7-bit 4: Reserved.
PRTMOD1 PRTMOD0 (Bit 3, 2):
These two bits and PRTMOD2 (CR9 bit 7) determine the parallel port mode of the W83877TF (as
shown in the following Table 11-1).
Table 11-1
PRTMODS2
(BIT 7 OF CR9)
PRTMODS1
(BIT 3 OF CR0)
PRTMODS0
(BIT 2 OF CR0)
0
0
0
Normal
0
0
1
EXTFDC
0
1
0
Reserved
0
1
1
EXT2FDD
1
0
0
Reserved
1
0
1
EPP/SPP
1
1
0
ECP
1
1
1
ECP/EPP
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W83877TF/W83877TG
00
Normal Mode (Default), PRTMOD2 = 0
Default state after power-on reset. In this mode, the W83877TF is fully compatible with
the SPP and BPP mode.
01
Extension FDD Mode (EXTFDD), PRTMOD2 = 0
10
Reserved, PRTMOD2 = 0
11
Extension 2FDD Mode (EXT2FDD), PRTMOD2 = 0
00
Reserved, PRTMOD2 = 1
01
EPP Mode and SPP Mode, PRTMOD2 = 1
10
ECP Mode, PRTMOD2 = 1
11
ECP Mode and EPP Mode, PRTMOD2 = 1
Bit 1: Reserved.
IPD (Bit 0):
This bit is used to select the W83877TF/TG's legacy power-down functions. When the bit 0 is set to 1,
W83877TF/TG will stop its clock internally and enter power-down (IPD) mode immediately.
W83877TF/TG will not leave the power-down mode until either a system power-on reset from the MR
pin or this bit is reset to 0 to program the chip back to power-on state.
11.2.2
Configuration Register 1 (CR1), default = 00H
When the device is in Extended Function mode and EFIR is 01H, the CR1 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
reserved
reserved
reserved
reserved
reserved
reserved
reserved
ABCHG
ABCHG (Bit 7):
This bit enables the FDC AB Change Mode. Default to be enabled at power-on reset.
0
Drives A and B assigned as usual
1
Drive A and drive B assignments exchanged
Bit 6-bit 0: Reserved.
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Revision 0.7
W83877TF/W83877TG
11.2.3
Configuration Register 2 (CR2), default = 00H
When the device is in Extended Function mode and EFIR is 02H, the CR2 register can be accessed
through EFDR. This register is reserved.
11.2.4
Configuration Register 3 (CR3), default = 30H
When the device is in Extended Function mode and EFIR is 03H, the CR3 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
SUBMIDI
SUAMIDI
reserved
reserved
reserved
EPPVER
reserved
reserved
Bit 7-bit 6: Reserved.
EPPVER (Bit 5):
This bit selects the EPP version of parallel port:
0
Selects the EPP 1.9 version
1
Selects the EPP 1.7 version (default)
Bit 4: Reserved.
Bit 3-bit 2: Reserved.
SUAMIDI (Bit 1):
This bit selects the clock divide rate of UARTA.
0
Disables MIDI support, UARTA clock = 24 MHz divided by 13
1
Enables MIDI support, UARTA clock = 24 MHz divided by 12
(default)
SUBMIDI (Bit 0):
This bit selects the clock divide rate of UARTB.
0
Disables MIDI support, UARTB clock = 24 MHz divided by 13
1
Enables MIDI support, UARTB clock = 24 MHz divided by 12
(default)
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W83877TF/W83877TG
11.2.5
Configuration Register 4 (CR4), default = 00H
When the device is in Extended Function mode and EFIR is 04H, the CR4 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBTRI
URATRI
reserved
PRTTRI
URBPWD
URAPWD
reserved
PRTPWD
PRTPWD (Bit 7):
0
Supplies power to the parallel port (default)
1
Puts the parallel port in power-down mode
Bit 6: Reserved.
URAPWD (Bit 5):
0
Supplies power to COMA (default)
1
Puts COMA in power-down mode
URBPWD (Bit 4):
0
Supplies power to COMB (default)
1
Puts COMB in power-down mode
PRTTRI (Bit 3):
This bit enables or disables the tri-state outputs of parallel port in power-down mode.
0
The output pins of the parallel port will not be tri-stated when parallel port is in powerdown mode. (default)
1
The output pins of the parallel port will be tri-stated when parallel port is in powerdown mode.
Bit 2: Reserved.
URATRI (Bit 1):
This bit enables or disables the tri-state outputs of UARTA in power-down mode.
0
The output pins of UARTA will not be tri-stated when UARTA is in power-down mode.
1
The output pins of UARTA will be tri-stated when UARTA is in power-down mode.
URBTRI (Bit 0):
This bit enables or disables the tri-state outputs of UARTB in power-down mode.
0
The output pins of UARTB will not be tri-stated when UARTB is in power-down mode.
1
The output pins of UARTB will be tri-stated when UARTB is in power-down mode.
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Revision 0.7
W83877TF/W83877TG
11.2.6
Configuration Register 5 (CR5), default = 00H
When the device is in Extended Function mode and EFIR is 05H, the CR5 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
0
1
ECPFTHR0
ECPFTHR1
ECPFTHR2
ECPFTHR3
reserved
reserved
reserved
reserved
Bit 7- bit 4: Reserved
ECPFTHR3-0 (bit 3-0): These four bits define the FIFO threshold for the ECP mode parallel port. The
default value is 0000 after power-up.
11.2.7
Configuration Register 6 (CR6), default = 00H
When the device is in Extended Function mode and EFIR is 06H, the CR6 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
reserved
FDCTRI
reserved
FDCPWD
FIPURDWM
SEL4FDD
reserved
reserved
Bit 7- bit 6: Reserved
SEL4FDD (Bit 5): Selects four FDD mode
0
Selects two FDD mode (default, see Table 11-2)
1
Selects four FDD mode
DSA , DSB , MOA and MOB output pins are encoded as show in Table 11-3 to select
four drives.
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W83877TF/W83877TG
Table 11-2
DO REGISTER ( 3F2H )
MOB
MOA
DSB
DSA
DRIVE
BIT 7
BIT 6
BIT 5
BIT 4
BIT 1
BIT 0
0
0
0
0
0
0
1
1
1
1
--
0
0
0
1
0
0
1
0
1
0
FDD A
0
0
1
0
0
1
0
1
0
1
FDD B
0
1
0
0
0
1
1
1
1
1
--
1
0
0
0
1
1
1
1
1
1
--
MOB
MOA
DSB
DSA
DRIVE
SELECTED
Table 11-3
DO REGISTER ( 3F2H )
SELECTED
BIT 7
BIT 6
BIT 5
BIT 4
BIT 1
BIT 0
0
0
0
0
X
X
1
1
x
x
--
0
0
0
1
0
0
0
0
0
0
FDD A
0
0
1
0
0
1
0
0
0
1
FDD B
0
1
0
0
1
0
0
0
1
0
FDD C
1
0
0
0
1
1
0
0
1
1
FDD D
FIPURDWN (Bit 4):
This bit controls the internal pull-up
DSKCHG , and WP .
0
1
FDCPWD (Bit 3):
This bit controls the power to the FDC.
0
1
Bit 2: Reserved.
resistors of the FDC input pins RDATA , INDEX , TRAK0 ,
The internal pull-up resistors of FDC are turned on. (default)
The internal pull-up resistors of FDC are turned off.
Power is supplied to the FDC. (default)
Puts the FDC in power-down mode.
FDCTRI (Bit 1):
This bit enables or disables the tri-state outputs of the FDC in power-down mode.
0
The output pins of the FDC will not be tri-stated when FDC is
in power-down mode.
1
The output pins of the FDC will be tri-stated when FDC is in
power-down mode.
Bit 0: Reserved.
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Revision 0.7
W83877TF/W83877TG
11.2.8
Configuration Register 7 (CR7), default = 00H
When the device is in Extended Function mode and EFIR is 07H, the CR7 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
FDD A type 0
FDD A type 1
FDD B type 0
FDD B type 1
FDD C type 0
FDD C type 1
FDD D type 0
FDD D type 1
FDD D type 1, 0 (Bit 7, 6):
These two bits select the type of FDD D.
Selects normal mode. When RWC = 0, the data transfer rate is 250 Kb/s. When
RWC = 1, the data transfer rate is 500 Kb/s.
Three mode FDD select (EN3MODE = 1):
00
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC , selects 720 KB double-density FDD.
FDD C type 1, 0 (Bit 5, 4):
These two bits select the type of FDD C.
00
Selects normal mode. When RWC = 0, the data transfer rate is 250 kb/s. When
RWC = 1, he data transfer rate is 500 kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC , selects 720 KB double-density FDD.
FDD B type 1, 0 (Bit 3, 2):
These two bits select the type of FDD B.
00
Selects normal mode. When RWC = 0, the data transfer rate is 250 Kb/s. When
RWC = 1, the data transfer rate is 500 Kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC , selects 720 KB double-density FDD.
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W83877TF/W83877TG
FDD A type 1, 0 (Bit 1, 0):
These two bits select the type of FDD A.
00
Selects normal mode. When RWC = 0, the data transfer rate is 250 Kb/s. When
RWC = 1, the data transfer rate is 500 Kb/s.
Three mode FDD select (EN3MODE = 1):
01
RWC = 0, selects 1.2 MB high-density FDD.
10
RWC = 1, selects 1.44 MB high-density FDD.
11
Don't care RWC , selects 720 KB double-density FDD.
11.2.9
Configuration Register 8 (CR8), default = 00H
When the device is in Extended Function mode and EFIR is 08H, the CR8 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
Floppy Boot Drive 0
Floppy Boot Drive 1
Media ID 0
Media ID 1
SWWP
DISFDDWR
reserved
reserved
Bit 7 - bit 6: Reserved.
DISFDDWR (Bit 5):
This bit enables or disables FDD write data.
0
Enables FDD write
1
Disables FDD write (forces pins WE , WD to stay high)
Once this bit is set high, the FDC operates normally, but because pin WE is inactive, the FDD will not
write data to diskettes. For example, if a diskette is formatted with DISFDDWR = 1, after the format
command has been executed, messages will be displayed that appear to indicate that the format is
complete. If the diskette is removed from the disk drive and inserted again, however, typing the DIR
command will reveal that the contents of the diskette have not been modified and the diskette was not
actually reformatted.
Because as the operating system (e.g., DOS) reads the diskette files, it keeps the files in memory, if
there is a write operation, DOS will write data to the diskette and memory simultaneously. When DOS
wants to read the diskette, it will first search for the files in memory. If DOS finds the file in memory, it
will not issue a read command to read the diskette. When DISFDDWR = 1, DOS still writes data to the
diskette and memory, but only the data in memory are updated. If a read operation is performed, data
are read from memory first, and not from the diskette. The action of removing the diskette from the
drive and inserting it again forces the DSKCHG pin active. DOS will then read the contents of the
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
diskette and will show that the contents have not been modified. The same holds true with write
commands.
This disable FDD write function allows users to protect diskettes against computer viruses by ensuring
that no data are written to the diskette.
SWWP (Bit 4):
0
1
Normal, use WP to determine whether the FDD is write-protected or not
FDD is always write-protected
Media ID 1 Media ID 0 (Bit 3, 2):
These two bits hold the media ID bit 1, 0 for three mode
Floppy Boot Drive 1 Floppy Boot Drive 0 (Bit 1, 0)
These two bits hold the value of floppy boot drive 1 and drive 0 for three mode
11.2.10
Configuration Register 9 (CR9), default = 0CH
When the device is in Extended Function mode and EFIR is 09H, the CR9 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
CHIP ID0
CHIP ID1
CHIP ID2
CHIP ID3
reserved
EN3MODE
LOCKREG
PRTMODS2
PRTMODS2 (Bit 7):
This bit and PRTMODS1, PRTMODS0 (bits 3, 2 of CR0) select the operating mode of the
W83877TF/TG. Refer to the descriptions of CR0.
LOCKREG (Bit 6):
This bit enables or disables the reading and writing of all configuration registers.
0
Enables the reading and writing of CR0-CR45
1
Disables the reading and writing of CR0-CR45 (locks W83877TF/TG extension
functions)
EN3MODE (Bit 5):
This bit enables or disables three mode FDD selection. When this bit is high, it enables the read/write
3F3H register.
0
Disables 3 mode FDD selection
1
Enables 3 mode FDD selection
When three mode FDD function is enabled, the value of RWC depends on bit 5 and bit 4 of
TDR(3F3H). The values of RWC and their meaning are shown in Table 11-4.
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W83877TF/W83877TG
Table 11-4
BIT 5 OF TDR
BIT 4 OF TDR
RWC
RWC = 0
RWC = 1
0
0
Normal
250K bps
500K bps
0
1
0
1.2 M FDD
X
1
0
1
X
1.4M FDD
1
1
X
X
X
Bit 4: Reserved.
CHIP ID 3, CHIP ID 2, CHIP ID 1, CHIP ID 0 (Bit 3-bit 0):
These four bits are read-only bits that contain chip identification information. The value is 0CH for
W83877TF/TG during a read.
11.2.11
Configuration Register A (CR0A), default = 00H
When the device is in Extended Function mode and EFIR is 0AH, the CRA register can be accessed
through EFDR. This register is reserved.
11.2.12
Configuration Register B (CR0B), default = 0CH
When the device is in Extended Function mode and EFIR is 0BH, the CRB register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
DRV2EN
INVERTZ
MFM
IDENT
ENIFCHG
RXW4C
TXW4C
reserved
Bit 7: Reserved.
TXW4C (Bit 6):
This bit is active high. When active, the IR controller will wait for a 4-character period of time after the
end of last receiving before it can start transmitting data.
RXW4C (Bit 5):
This bit is active high. When active, the IR controller will wait for a 4-character period of time after the
end of last transmitting before it can start receiving data.
ENIFCHG (Bit 4):
This bit is active high. When active, it enables host interface mode change, which is determined by
IDENT (Bit 3) and MFM (Bit 2).
-75-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
IDENT (Bit 3):
This bit indicates the type of drive being accessed and changes the level on RWC (pin 87).
0
RWC will be active low for high data rates (typically used for 3.5" drives)
1
RWC will be active high for high data rates (typically used for 5.25" drives)
When hardware reset or ENIFCHG is a logic 1, IDENT and MFM select one of three interface modes,
as shown in Table 11-5.
Table 11-5
IDENT
MFM
INTERFACE
0
0
Model 30 mode
0
1
PS/2 mode
1
0
AT mode
1
1
AT mode
MFM (Bit 2):
This bit and IDENT select one of the three interface modes (PS/2 mode, Model 30, or PC/AT mode).
INTVERTZ (Bit 1):
This bit determines the polarity of all FDD interface signals.
0
FDD interface signals are active low
1
FDD interface signals are active high
DRV2EN (Bit 0): PS/2 mode only
When this bit is a logic 0, this indicates that a second drive is installed and is reflected in status
register A.
11.2.13
Configuration Register C (CR0C), default = 28H
When the device is in Extended Function mode and EFIR is 0CH, the CR0C register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
TX2INV
RX2INV
reserved
URIRSEL
reserved
HEFERE
TURB
TURA
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W83877TF/W83877TG
TURA (Bit 7):
0
the clock source of UART A is 1.8462 MHZ (24 MHz divide 13) (default)
1
the clock source of UART A is 24 MHz, it can make the baudrate of UART A up to 1.5
MHz
TURB (Bit 6):
0
the clock source of UART B is 1.8462 MHz (24 MHz divide 13) (default)
1
the clock source of UART B is 24 MHz, it can make the baudrate of UART A up to 1.5
MHz
HEFERE (Bit 5): this bit combines with HEFRAS (CR16 bit 0) to define how to enable Extended
Function Registers.
HEFRAS
HEFERE
ADDRESS AND VALUE
0
0
write 88H to the location 250H
0
1
write 89H to the location 250H (default)
1
0
write 86H to the location 3F0H twice
1
1
write 87H to the location 3F0H twice
The default value of HEFERE is 1.
Bit 4: Reserved.
URIRSEL (Bit 3):
0
select UART B as IR function.
1
select UART B as normal function.
The default value of URIRSEL is 1.
Bit 2: Reserved.
RX2INV (Bit 1):
0
the SINB pin of UART B function or IRRX pin of IR function in normal condition.
1
inverse the SINB pin of UART B function or IRRX pin of IR function
TX2INV (Bit 0):
0
the SOUTB pin of UART B function or IRTX pin of IR function in normal condition.
1
inverse the SOUTB pin of UART B function or IRTX pin of IR function.
-77-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.2.14 Configuration Register D (CR0D), default = A3H
When the device is in Extended Function mode and EFIR is 0DH, the CR0D register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
IRMODE0
IRMODE1
IRMODE2
HDUPLX
SIRRX0
SIRRX1
SIRTX0
SIRTX1
SIRTX1 (Bit 7): IRTX pin selection bit 1
SIRTX0 (Bit 6): IRTX pin selection bit 0
SIRTX1
SIRTX0
IRTX OUTPUT ON PIN
0
0
disabled
0
1
IRTX1 (pin 43)
1
0
IRTX2 (pin 95)
1
1
disabled
SIRRX1 (Bit 5): IRRX pin selection bit 1
SIRRX0 (Bit 4): IRRX pin selection bit 0
SIRRX1
SIRRX0
IRRX INPUT ON PIN
0
0
disabled
0
1
IRRX1 (pin 42)
1
0
IRRX2 (pin 94)
1
1
disabled
HDUPLX (Bit 3):
0
The IR function is Full Duplex.
1
The IR function is Half Duplex.
IRMODE2 (Bit 2): IR function mode selection bit 2
IRMODE1 (Bit 1): IR function mode selection bit 1
IRMODE0 (Bit 0): IR function mode selection bit 0
-78 -
W83877TF/W83877TG
IR MODE
IR FUNCTION
IRTX
IRRX
00X
Disable
tri-state
high
010*
IrDA
Active pulse 1.6 μS
Demodulation into SINB
011*
IrDA
Active pulse 3/16 bit time
Demodulation into SINB
100
ASK-IR
Inverting IRTX pin
routed to SINB
101
ASK-IR
Inverting IRTX & 500 KHZ clock
routed to SINB
110
ASK-IR
Inverting IRTX
Demodulation into SINB
111*
ASK-IR
Inverting IRTX & 500 KHZ clock
Demodulation into SINB
Note: The notation is normal mode in the IR function.
The SIR schematic diagram for registers CRC and CRD is shown below.
HUPLX
(CRD.bit3)
Transmission
Time Frame
IRRX1
16550A
SIN2
Demodulation
IR-DA
SIN
1
1
MUX 0
1
MUX 0
UART2
SOUT
RX2INV URIRSEL
(CRC.bit1) (CRC.bit3)
IRDA Mod.
3/16
1
IRDA
IRDA Mod.
Mod1.6u
ASK_IR
MUX 0
IRMODE2,1=00
IRMODE2
(CRD.bit2)
01
00
10
MUX11
Demodulation
IRMODE1
(CRD.bit1)
IRRX2
SIRRX1~0
CR0D.bit5,4
0
0 MUX
11,00
0
1 MUX
01
IRMODE0
(CRD.bit0)
1
500KHZ
+5V
NCS0 (default)
+5V
1 MUX
IRMODE2
(CRD.bit2)
0 MUX
10
MUX
TX2INV
URIRSEL CRC.bit0
(CRC,bit3)
disable
IRTX1 SOUT2
IRTX2
NCS1 (default)
SIRTX1~0
CRD.bit7,6
IRMODE0
(CRD.bit0)
11.2.15
Configuration Register E (CR0E), Configuration Register F (CR0F)
Reserved for testing. Should be kept all 0's.
-79-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.2.16 Configuration Register 10 (CR10), default = 00H
When the device is in Extended Function mode and EFIR is 10H, the CR10 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
GIO0AD0
GIO0AD1
GIO0AD2
GIO0AD3
GIO0AD4
GIO0AD5
GIO0AD6
GIO0AD7
GIO0AD7-GIO0AD0 (Bit 7-bit 0): GIOP0 (pin 92) address bit 7 - bit 0.
11.2.17 Configuration Register 11 (CR11), default = 00H
When the device is in Extended Function mode and EFIR is 11H, the CR11 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
GIO0AD8
GIO0AD9
GIO0AD10
reserved
reserved
reserved
G0CADM0
G0CADM1
G0CADM1-G0CADM0 (Bit 7, 6): GIOP0 address bit compare mode selection
G0CADM1
G0CADM0
GIOP0 PIN
0
0
compare GIO0AD10-GIO0AD0 with SA10-SA0
0
1
compare GIO0AD10-GIO0AD1 with SA10-SA1
1
0
compare GIO0AD10-GIO0AD2 with SA10-SA2
1
1
compare GIO0AD10-GIO0AD3 with SA10-SA3
Bit 5-bit 3: Reserved
GIO0AD10-GIO0AD8 (Bit 2-bit 0): GIOP0 (pin 92) address bit 10-bit 8.
-80 -
W83877TF/W83877TG
11.2.18 Configuration Register 12 (CR12), default = 00H
When the device is in Extended Function mode and EFIR is 12H, the CR12 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
GIO1AD0
GIO1AD1
GIO1AD2
GIO1AD3
GIO1AD4
GIO1AD5
GIO1AD6
GIO1AD7
GIO1AD7-GIO1AD0 (Bit 7-bit 0): GIOP1 (pin 96) address bit 7-bit 0.
11.2.19 Configuration Register 13 (CR13), default = 00H
When the device is in Extended Function mode and EFIR is 13H, the CR13 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
GIO1AD8
GIO1AD9
GIO1AD10
reserved
reserved
reserved
G1CADM0
G1CADM1
G1CADM1-G1CADM0 (bit 7, 6): GIOP1 address bit compare mode selection
G1CADM1
G1CADM0
GIOP1 PIN
0
0
compare GIO1AD10-GIO1AD0 with SA10-SA0
0
1
compare GIO1AD10-GIO1AD1 with SA10-SA1
1
0
compare GIO1AD10-GIO1AD2 with SA10-SA2
1
1
compare GIO1AD10-GIO1AD3 with SA10-SA3
Bit 5- bit 3: Reserved
GIO1AD10-GIO1AD8 (Bit 2-bit 0): GIOP1 (pin 96) address bit 10-bit 8.
-81-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.2.20 Configuration Register 14 (CR14), default = 00H
When the device is in Extended Function mode and EFIR is 14H, the CR14 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
GDA0IPI
GDA0OPI
GCS0IOW
GCS0IOR
GIO0CSH
GIOP0MD0
GIOP0MD1
GIOP0MD2
GIOP0MD2-GIOP0MD0 (Bit 7-bit 5): GIOP0 pin mode selection
GIOP0MD2
GIOP0MD1
GIOP0MD0
GIOP0 PIN
0
0
0
inactive (tri-state)
0
0
1
as a data output pin (SD0→GIOP0), when (AEN = L)
AND (NIOW = L) AND (SA10-0 = GIO0AD10-0), the
value of SD0 will be present on GIOP0
0
1
0
as a data input pin (GIOP0→SD0), when (AEN = L)
AND (NIOR = L) AND (SA10-0 = GIO0AD10-0), the
value of GIOP0 will be present on SD0
0
1
1
as a data input/output pin (GIOP0↔SD0).
When (AEN = L) AND (NIOW = L) AND (SA10-0 =
GIO0AD10-0), the value of SD0 will be present on
GIOP0 When (AEN = L) AND (NIOR = L) AND (SA10-0
= GIO0AD10-0), the value of GIOP0 will be present on
SD0
1
X
X
as a Chip Select pin, the pin will be active at (AEN = L)
AND (SA10-0 = GIO0AD10-0) OR (NIOR = L) OR
(NIOW = L)
GIO0CSH(Bit 4):
0
the Chip Select pin will be active LOW when (AEN = L) AND (SA10-0 = GIO0AD100) OR (NIOR = L) OR (NIOW = L)
1
the Chip Select pin will be active HIGH when (AEN = L) AND (SA10-0 = GIO0AD100) OR (NIOR = L) OR (NIOW = L)
GCS0IOR (Bit 3): See below.
-82 -
W83877TF/W83877TG
GCS0IOW (Bit 2): See below.
GCS0IOR
GCS0IOW
0
0
GIOP0 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO0AD10-0)
0
1
GIOP0 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO0AD10-0) AND (NIOW = L)
1
0
GIOP0 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO0AD10-0) AND (NIOR = L)
1
1
GIOP0 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO0AD10-0) AND (NIOW = L OR
NIOR = L)
GDA0OPI (Bit 1): See below.
GDA0IPI (Bit 0): See below.
GDA0OPI
GDA0IPI
0
0
GIOP0 functions as a data pin, and GIOP0→SD0, SD0→GIOP0
0
1
GIOP0 functions as a data pin, and inverse GIOP0→SD0, SD0→
GIOP0
1
0
GIOP0 functions as a data pin, and GIOP0→SD0, inverse SD0→
GIOP0
1
1
GIOP0 functions as a data pin, and inverse GIOP0→SD0, inverse SD0
→GIOP0
11.2.21 Configuration Register 15 (CR15), default = 00H
When the device is in Extended Function mode and EFIR is 15H, the CR15 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
GDA0IPI
GDA0OPI
GCS0IOW
GCS0IOR
GIO0CSH
GIOP0MD0
GIOP0MD1
GIOP0MD2
-83-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
GIOP1MD2-GIOP1MD0 (Bit 7-bit 5): GIOP1 pin mode selection
GIOP1MD2
GIOP1MD1
GIOP1MD0
GIOP1 PIN
0
0
0
inactive (tri-state)
0
0
1
as a data output pin (SD1→GIOP1), when (AEN = L)
AND (NIOW = L) AND (SA10-0 = GIO1AD10-0), the
value of SD1 will be present on GIOP1
0
1
0
as a data input pin (GIOP1→SD1), when (AEN = L)
AND (NIOR = L) AND (SA10-0 = GIO1AD10-0), the
value of GIOP1 will be present on SD1
0
1
1
as a data input/output pin (GIOP1↔SD1).
When (AEN = L) AND (NIOW = L) AND (SA10-0 =
GIO1AD10-0), the value of SD1 will be present on
GIOP1 When (AEN = L) AND (NIOR = L) AND (SA10-0
= GIO1AD10-0), the value of GIOP1 will be present on
SD1
1
X
X
as a Chip Select pin, the pin will be active at (AEN = L)
AND (SA10-0 = GIO1AD10-0) OR (NIOR = L) OR
(NIOW = L)
GIO1CSH (Bit 4):
0
the Chip Select pin will active LOW when (AEN = L) AND (SA10-0 = GIOAD10-0) OR
(NIOR = L) OR (NIOW = L)
1
the Chip Select pin will active HIGH when (AEN = L) AND (SA10-0 = GIOAD10-0)
OR (NIOR = L) OR (NIOW = L)
GCS1IOR (Bit 3): See below.
GCS1IOW (Bit 2): See below.
GCS1IOR
GCS1IOW
0
0
GIOP1 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO1AD10-0)
0
1
GIOP1 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO1AD10-0) AND (NIOW = L)
1
0
GIOP1 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO1AD10-0) AND (NIOR = L)
1
1
GIOP1 functions as a Chip Select pin, and will be active when
(AEN = L) AND (SA10-0 = GIO1AD10-0) AND (NIOW = L OR
NIOR = L)
GDA0OPI (Bit 1): See below.
-84 -
W83877TF/W83877TG
GDA1IPI (Bit 0): See below.
GDA1OPI
GDA1IPI
0
0
GIOP1 functions as a data pin, and GIOP1→SD1, SD1→GIOP1
0
1
GIOP1 functions as a data pin, and inverse GIOP1→SD1, SD1→
GIOP1
1
0
GIOP1 functions as a data pin, and GIOP1→SD1, inverse SD1→
GIOP1
1
1
GIOP1 functions as a data pin, and inverse GIOP1→ SD1, inverse
SD1→GIOP1
11.2.22 Configuration Register 16 (CR16), default = 04H
When the device is in Extended Function mode and EFIR is 16H, the CR16 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
HEFRAS
reserved
PNPCVS
reserved
G0IQSEL
G1IQSEL
reserved
reserved
Bit 7-bit 6: Reserved.
G1IQSEL (Bit 5):
0
1
pin 96 function as IRQ_A.
pin 96 function as GIO1.
The corresponding power-on setting pin is NRTSB (pin 45).
G0IQSEL (Bit 4):
0
1
pins 92 function as IRQ_B.
pins 92 function as GIO0.
The corresponding power-on setting pin is NRTSB (pin 45).
Bit 3: Reserved.
PNPCVS (bit 2):
0
1
PnP-related registers (CR20, CR23-29) reset to be all 0s.
default settings for these registers.
-85-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
The corresponding power-on setting pin is NRTSA (pin 36).
PNP REGISTER
PNPCVS = 1
PNPCVS = 0
CR20
CR23
CR24
CR25
CR26
CR27
CR28
CR29
FCH
DEH
FEH
BEH
23H
05H
43H
60H
00H
00H
00H
00H
00H
00H
00H
00H
Note: The new value of PNPCVS must be complementary to the old one to make an effective change. For example, the user
must set PNPCVS to 1 first and then reset it to 0 to reset these PnP registers if the present value of PNPCVS is 0.
Bit 1: Reserved.
HEFRAS (Bit 0): combines with HEFERE (bit 5 of CR0C) to define how to access Extended Function
Registers (refer to bit 5 of CR0C description). The corresponding power-on setting
pin is NDTRA (pin 35).
11.2.23 Configuration Register 17 (CR17), default = 00H
When the device is in Extended Function mode and EFIR is 17H, the CR17 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
DSUBLGRQ
DSUALGRQ
DSPRLGRQ
DSFDLGRQ
PRIRQOD
reserved
reserved
reserved
Bit 7-bit 5: Reserved.
PRIRQOD (Bit 4):
0
printer IRQ ports are totem-poles in SPP mode and open-drains in ECP/EPP mode.
1
printer IRQ ports are totem-poles in all modes.
DSFDLGRQ (Bit 3):
0
enable FDC legacy mode on IRQ and DRQ selections. DO register bit 3 has effect on
selecting IRQ.
1
disable FDC legacy mode on IRQ and DRQ selections. DO register bit 3 has no effect
on selecting IRQ.
-86 -
W83877TF/W83877TG
DSPRLGRQ (Bit 2):
0
enable PRT legacy mode on IRQ and DRQ selections. DCR bit 4 has effect on
selecting IRQ.
1
disable PRT legacy mode on IRQ and DRQ selections. DCR bit 4 has no effect on
selecting IRQ.
DSUALGRQ (Bit 1):
0
enable UART A legacy mode on IRQ selection. MCR bit 3 has effect on selecting IRQ.
1
disable UART A legacy mode on IRQ selection. MCR bit 3 has no effect on selecting
IRQ.
DSUBLGRQ (Bit 0):
0
enable UART B legacy mode on IRQ selection. MCR bit 3 has effect on selecting IRQ.
1
disable UART B legacy mode on IRQ selection. MCR bit 3 has no effect on selecting
IRQ.
11.2.24
Configuration Register 18 (CR18), default=00H
When the device is in Extended Function mode and EFIR is 18H, the CR18 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
SHARA
SHARB
SHARC
SHARD
SHARE
SHARF
SHARG
SHARH
This register is used to select whether these interrupt request pins are in the IRQ sharing mode. While
in the IRQ sharing mode, the corresponding pin is low active for 200ns for the interrupt request and
keeps tri-stated otherwise.
SHARH (Bit 7):
0
pin IRQ_H in the legacy ISA IRQ mode.
1
pin IRQ_H in the IRQ sharing mode.
SHARG (Bit 6):
0
pin IRQ_G in the legacy ISA IRQ mode.
1
pin IRQ_G in the IRQ sharing mode.
-87-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
SHARF (Bit 5):
0
pin IRQ_F in the legacy ISA IRQ mode.
1
pin IRQ_F in the IRQ sharing mode.
SHARE (Bit 4):
0
pin IRQ_E in the legacy ISA interrupt mode.
1
pin IRQ_E in the IRQ sharing mode.
SHARD (Bit 3):
0
pin IRQ_D in the legacy ISA IRQ mode.
1
pin IRQ_D in the IRQ sharing mode.
SHARC (Bit 2):
0
pin IRQ_C in the legacy ISA IRQ mode.
1
pin IRQ_C in the IRQ sharing mode.
SHARB(Bit 1):
0
pin IRQ_B in the legacy ISA IRQ mode.
1
pin IRQ_B in the IRQ sharing mode.
SHARA (Bit 0):
0
pin IRQ_A in the legacy ISA IRQ mode.
1
pin IRQ_A in the IRQ sharing mode.
11.2.25 Configuration Register 19 (CR19), default=00H
When the device is in Extended Function mode and EFIR is 19H, the CR19 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
FASTB
FASTA
reserved
reserved
reserved
reserved
reserved
reserved
-88 -
W83877TF/W83877TG
This register is used for the high speed modem application. While the bit is set to logic 1 it can make
the baudrate of UART up to 921.2KBPS (the clock source of UART is 14.769MHz) for high speed
transmit/receive.
Bit 7 - bit 2: Reserved.
FASTA (Bit 1):
0
the clock source of UART A is the same as the frequency of TURA (CR0C bit 7)
and SUAMIDI (CR3 bit 1) selected.
1
the clock source of UART A is 14.769MHZ.
FASTB (Bit 0):
0
the clock source of UART B is the same as the frequency of TURB (CR0C bit 6)
and SUBMIDI (CR3 bit 0) selected.
1
the clock source of UART B is 14.769MHZ.
11.2.26 Configuration Register 20 (CR20)
When the device is in Extended Function mode and EFIR is 20H, the CR20 register can be accessed
through EFDR. Default = FCH if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions
are as follows:
7
6
5
4
3
2
1
0
reserved
reserved
FDCAD2
FDCAD3
FDCAD4
FDCAD5
FDCAD6
FDCAD7
This register is used to select the base address of the Floppy Disk Controller (FDC) from 100H-3F0H
on 16-byte boundaries. NCS = 0 and A10 = 0 are required to access the FDC registers. A[3:0] are
always decoded as 0xxxb.
FDCAD7-FDCAD2 (Bit 7-bit 2): match A[9:4]. Bit 7 = 0 and bit 6 = 0 disable this decode.
Bit 1-bit 0: Reserved, fixed at zero.
11.2.27 Configuration Register 23 (CR23)
When the device is in Extended Function mode and EFIR is 23H, the CR23 register can be accessed
through EFDR. Default = DEH if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
-89-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7
6
5
4
3
2
1
0
PRTAD0
PRTAD1
PRTAD2
PRTAD3
PRTAD4
PRTAD5
PRTAD6
PRTAD7
This register is used to select the base address of the parallel port. If EPP is disable, the parallel port
can be set from 100H-3FCH on 4-byte boundaries. If EPP is enable, the parallel port can be set from
100H-3F8H on 8-byte boundaries. NCS = 0 and A10 = 0 are required to access the parallel port when
in compatible, bi-directional, or EPP modes. A10 is active in ECP mode.
PRTAD7-PRTAD0 (Bit 7-bit 0): match A[9:2]. Bit 7 = 0 and bit 6 = 0 disable this decode.
11.2.28 Configuration Register 24 (CR24)
When the device is in Extended Function mode and EFIR is 24H, the CR24 register can be accessed
through EFDR. Default = FEH if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
7
6
5
4
3
2
1
0
reserved
URAAD1
URAAD2
URAAD3
URAAD4
URAAD5
URAAD6
URAAD7
This register is used to select the base address of the UART A from 100H-3F8H on 8-byte
boundaries. NCS = 0 and A10 = 0 are required to access the UART A registers. A[2:0] are don't-care
conditions.
URAAD7-URAAD1 (Bit 7-bit 1): match A[9:3]. Bit 7 = 0 and bit 6 = 0 disable this decode.
Bit 0: Reserved, fixed at zero.
11.2.29 Configuration Register 25 (CR25)
When the device is in Extended Function mode and EFIR is 25H, the CR25 register can be accessed
through EFDR. Default = BEH if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
7
6
5
4
3
2
1
0
reserved
URBAD1
URBAD2
URBAD3
URBAD4
URBAD5
URBAD6
URBAD7
-90 -
W83877TF/W83877TG
This register is used to select the base address of the UART B from 100H-3F8H on 8-byte
boundaries. NCS = 0 and A10 = 0 are required to access the UART B registers. A[2:0] are don't-care
conditions.
URBAD7-URBAD1 (Bit 7-bit 1): match A[9:3]. Bit 7 = 0 and bit 6 = 0 disable this decode.
Bit 0: Reserved, fixed at zero.
11.2.30 Configuration Register 26 (CR26)
When the device is in Extended Function mode and EFIR is 26H, the CR26 register can be accessed
through EFDR. Default = 23H if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
7
6
5
4
3
2
1
0
PRTDQS0
PRTDQS1
PRTDQS2
PRTDQS3
FDCDQS0
FDCDQS1
FDCDQS2
FDCDQS3
FDCDQS3-FDCDQS0 (Bit 7-bit 4): Allocate DMA resource for FDC.
PRTDQS3-PRTDQS0 (Bit 3-bit 0): Allocate DMA resource for PRT.
BIT 7- BIT4, BIT 3 - BIT 0
DMA SELECTED
0000
None
0001
DMA_A
0010
DMA_B
0011
DMA_C
11.2.31 Configuration Register 27 (CR27)
When the device is in Extended Function mode and EFIR is 27, the CR27 register can be accessed
through EFDR. Default = 05H if CR6 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
7
6
5
4
3
2
1
0
PRTIQS0
PRTIQS1
PRTIQS2
PRTIQS3
reserved
ECPIRQx0
ECPIRQx1
ECPIRQx2
-91-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
ECPIRQx2-ECPIRQx0 (Bit7-bit 5): These bits are configurable equivalents to bit[5:3] of cnfgB register
in ECP mode except that cnfgB[5:3] are read-only bits. They indicate the IRQ resource assigned for
the ECP printer port. It is the software designer's responsibility to ensure that CR27[7:5] and
CR27[3:0] are consistent. For example, CR27[7:5] should be filled with 001 (select IRQ 7) if CR27[3:0]
are to be programmed as 0101 (select IRQ_E) while IRQ_E is connected to IRQ 7.
CR27[7:5]
000
001
010
011
100
101
110
111
IRQ RESOURCE
reflect other IRQ resources selected by CR27[3:0] (default)
IRQ 7
IRQ 9
IRQ 10
IRQ 11
IRQ 14
IRQ 15
IRQ 5
Bit 4: Reserved.
PRTIQS3-PRTIQS0 (Bit 3-bit 0): Select IRQ resource for the parallel port. Any unselected IRQ pin is
in tri-state.
CR27[3:0]
SELECT IRQ PIN
0000
0001
0010
0011
0100
0101
0110
0111
1000
None
IRQ_A
IRQ_B
IRQ_C
IRQ_D
IRQ_E
IRQ_F
IRQ_G
IRQ_H
While in the Serial IRQ mode (IRQMODS=1, CR31 bit2), the above selection is invalid and all the IRQ
signal pins, from IRQ_A to IRQ_H, are all in tri-state. The parallel port IRQ is dedicated to the
SERIRQ pin. For the host controller to correctly sample the parallel port IRQ, the parallel port IRQ
should be programmed to appear in one of IRQ/Data Frame sampling periods.
In Serial IRQ mode, the definition of PRTIQS3-PRTIQS0 (bit 3-bit 0) is as follows:
PRTIQS3-PRTIQS0 (Bit 3-bit 0): Select the IRQ/Data Frame sampling period on the SERIRQ pin.
-92 -
W83877TF/W83877TG
CR27[3:0]
IRQ/DATA FRAME PERIOD
0000
None
0001
IRQ1
0010
Reserved for SMI
0011
IRQ3
0100
IRQ4
0101
IRQ5
0110
IRQ6
0111
IRQ7
1000
IRQ8
1001
IRQ9
1010
IRQ10
1011
IRQ11
1100
IRQ12
1101
IRQ13
1110
IRQ14
1111
IRQ15
11.2.32 Configuration Register 28 (CR28)
When the device is in Extended Function mode and EFIR is 28, the CR28 register can be accessed
through EFDR. Default = 43H if CR6 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
7
6
5
4
3
2
1
0
URBIQS0
URBIQS1
URBIQS2
URBIQS3
URAIQS0
URAIQS1
URAIQS2
URAIQS3
URAIQS3-URAIQS0 (Bit 7-bit 4): Allocate interrupt resource for UART A.
URBIQS3-URBIQS0 (Bit 3-bit 0): Allocate interrupt resource for UART B.
-93-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.2.33 Configuration Register 29 (CR29)
When the device is in Extended Function mode and EFIR is 29, the CR29 register can be accessed
through EFDR. Default = 62H if CR6 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
7
6
5
4
3
2
1
0
IQNIQS0
IQNIQS1
IQNIQS2
IQNIQS3
FDCIQS0
FDCIQS1
FDCIQS2
FDCIQS3
FDCIQS3-FDCIQS0 (Bit 7-bit 4): Allocate interrupt resource for FDC.
IQNIQS3-IQNIQS0 (Bit 3-bit 0): Allocate interrupt resource for IRQIN.
11.2.34 Configuration Register 2C (CR2C), default=00H
When the device is in Extended Function mode and EFIR is 2CH, the CR2C register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
reserved
reserved
CLKINSEL
reserved
reserved
reserved
reserved
reserved
Bit 7 - bit 3 : Reserved.
CLKINSEL (Bit 2): Clock input frequency selection.
This pin should be reset/set according the CLKIN pin.
0
the clock source on CLKIN pin is 24 MHz.(default)
1
the clock source on CLKIN pin is 48 MHz.
Bit 1- bit 0: Reserved.
-94 -
W83877TF/W83877TG
11.2.35 Configuration Register 2D (CR2D), default=00H
When the device is in Extended Function mode and EFIR is 2DH, the CR2D register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
DRTA0
DRTA1
DIS_PRECOMP0
DRTB0
DRTB1
DIS_PRECOMP1
reserved
reserved
This register controls the data rate selection for FDC. It also controls if precompensation is enabled.
Bit 7 - bit 6: Reserved.
DIS_PRECOMP1 (Bit 5):
This bit controls if precompensation is enabled for FDD B.
0
enable precompensation for FDD B
1
disable precompensation for FDD B
DRTB1, DRTB0 (Bit 4,3):
These two bits combining with data rate selection bits in Date Rate Register select the operational
data rate for FDD B as shown in last table.
DIS_PRECOMP0 (Bit 2):
This bit controls if precompensation is enabled for FDD A.
0
enable precompensation for FDD A
1
disable precompensation for FDD A
DRTA1, DRTA0 (Bit 1 - bit 0):
These two bits combining with data rate selection bits in Date Rate Register select the operational
data rate for FDD A as follows:
-95-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
DRIVE RATE TABLE
DATA RATE
OPERATIONAL DATA RATE
DRTA1
DRTA0
DRATE1
DRATE0
MFM
FM
0
0
1
1
1M
---
0
0
0
0
500K
250K
0
0
0
1
300K
150K
0
0
1
0
250K
125K
0
1
1
1
1M
---
0
1
0
0
500K
250K
0
1
0
1
500K
250K
0
1
1
0
250K
125K
1
0
1
1
1M
---
1
0
0
0
500K
250K
1
0
0
1
2M
---
1
0
1
0
250K
125K
11.2.36 Configuration Register 31 (CR31), default=00H
When the device is in Extended Function mode and EFIR is 31H, the CR31 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
reserved
reserved
IRQMODS
reserved
SCIIRQ0
SCIIRQ1
SCIIRQ2
SCIIRQ3
SCIIRQ3 ~ SCIIRQ0 (Bit 7 - bit 4):
The four bits select one IRQ pin for the SCI signal except for dedicated SCI signal output pin. Any
unselected pin is in tri-state.
-96 -
W83877TF/W83877TG
CR31[7:4]
MAPPED IRQ PIN
0000
None (default)
0001
IRQ_A
0010
IRQ_B
0011
IRQ_C
0100
IRQ_D
0101
IRQ_E
0110
IRQ_F
0111
IRQ_G
1000
IRQ_H
While in the Serial IRQ mode (IRQMODS=1, CR31 bit 2), the above selection is invalid and all the
IRQ signal pins, from IRQ_A to IRQ_H, are all in tri-state. The SCI interrupt output is dedicated to the
SERIRQ pin. For the host controller to correctly sample the SCI interrupt, the SCI interrupt should be
programmed to appear in one of IRQ/Data Frame sampling periods.
In Serial IRQ mode, the definition of SCIIQS3-SCIIQS0 (bit 7-bit 4) is as follows:
SCIIQS3-SCIIQS0 (bit 7-bit 4): Select the IRQ/Data sampling period on the SERIRQ pin.
CR27[7:4]
IRQ/DATA FRAME PERIOD
0000
None
0001
IRQ1
0010
Reserved for SMI
0011
IRQ3
0100
IRQ4
0101
IRQ5
0110
IRQ6
0111
IRQ7
1000
IRQ8
1001
IRQ9
1010
IRQ10
1011
IRQ11
1100
IRQ12
1101
IRQ13
1110
IRQ14
1111
IRQ15
Bit 3: Reserved.
-97-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
IRQMODS (Bit 2):
IRQ mode selection. W83877TF/TG supports: (1) legacy ISA IRQ mode or ISA IRQ sharing mode. (2)
Serial IRQ mode used in the PCI bus. In the legacy ISA IRQ sharing mode, the selected IRQ pin for
the device's IRQ is defined in the configuration registers CR27 - CR29. In the ISA IRQ sharing mode,
configuration register CR18 indicates which IRQ pin is in the IRQ sharing mode.
0:
legacy ISA IRQ mode or ISA IRQ sharing mode.(default)
1:
Serial IRQ mode used in PCI bus.
Bit 1 - bit 0: Reserved.
11.2.37 Configuration Register 32 (CR32), default=00H
When the device is in Extended Function mode and EFIR is 32H, the CR32 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBPME
URAPME
FDCPME
PRTPME
reserved
reserved
reserved
CHIPPME
CHIPPME (Bit 7): W83877TF/TG chip power management enable.
0
disable the ACPI/Legacy and the auto power management functions.
1
enable the ACPI/Legacy and the auto power management functions.
Bit 6 - bit 4: Reserved.
PRTPME (Bit 3): Printer port power management enable.
0
disable the auto power management function.
1
enable the auto power management function, if this bit and CHIPPME(CR32 bit
7) are both set to 1.
.
FDCPME (Bit 2): FDC power management enable.
0
disable the auto power management function.
1
enable the auto power management function, if this bit and CHIPPME(CR32 bit
7) are both set to 1.
.
-98 -
W83877TF/W83877TG
URAPME (Bit 1): UART A power management enable.
0
disable and the auto power management function.
1
enable auto power management function, if this bit and CHIPPME(CR32 bit 7)
are both set to 1.
.
URBPME (Bit 0): UART B power management enable.
0
disable the auto power management functions.
1
enable the auto power management function, if this bit and CHIPPME(CR32 bit
7) are both set to 1.
11.2.38 Configuration Register 33 (CR33), default=00H
When the device is in Extended Function mode and EFIR is 33H, the CR33 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
reserved
reserved
PM1AD2
PM1AD3
PM1AD4
PM1AD5
PM1AD6
PM1AD7
PM1AD7 - PM1AD2 (Bit 7 - bit 2): Base address of the power management register block PM1.
This address is the base address of PM1a_EVT_BLK in the ACPI specification. The based address
should range from 01,0000,0000b to 11,1111,0000b ,i.e., 100H ~ 3F0H, where bit 1 and bit 0 of the
base address should be set to 0 and the based address is in the 16-byte alignment. Note that the
based address of PM1a_CNT_BLK is equal to PM1a_EVT_BLK + 4, and PM_TMR_BLK is equal to
PM1a_EVT_BLK + 8.
Bit 1 - bit 0: Reserved, fixed at 0.
11.2.39 Configuration Register 34 (CR34), default=00H
When the device is in Extended Function mode and EFIR is 34H, the CR34 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
reserved
GPEAD1
GPEAD2
GPEAD3
GPEAD4
GPEAD5
GPEAD6
GPEAD7
-99-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
GPEAD7 - GPEAD1 (Bit7 - bit 1): Base address of the power management register block GPE.
This address is the base address of GPE0_BLK in the ACPI specification. The based address should
range from 01,0000,0000b to 11,1111,1000b ,i.e., 100H ~ 3F8H, where bit 0 of the base address
should be set to 0 and the based address is in the 8-byte alignment. Note that the base address of
GPE1_BLK is GPE0_BLK + 4.
Bit 0: Reserved, fixed at 0.
11.2.40 Configuration Register 35 (CR35), default=00H
When the device is in Extended Function mode and EFIR is 35H, the CR35 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URACNT0
URACNT1
URACNT2
URACNT3
URACNT4
URACNT5
URACNT6
URACNT7
URACNT7 - URACNT0 (Bit 7 - bit 0): UART A idle timer count.
This register is used to specify the initial value of UART A idle timer. Once UART A enters the
working state (that is, after any access to this device, any IRQ, and any external input), the power
down machine of UART A reloads this count value and the idle timer counts down. When the timer
counts down to zero, UART A enters the power down state ,i.e., sleeping state. If this register is set to
00H, the power down function will be invalid. The time resolution of this value is minute or second,
which is defined by the TMIN_SEL bit of the CR3A. Note that (1). this register is valid only when the
power management function of UART A is enabled, that is, CHIPPME=1 (CR32 bit 7) and
URAPME=1 (CR32 bit 1), (2). If the register is set to 00H, UART A will remain in the current
state(working or sleeping).
11.2.41 Configuration Register 36 (CR36), default=00H
When the device is in Extended Function mode and EFIR is 36H, the CR36 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBCNT0
URBCNT1
URBCNT2
URBCNT3
URBCNT4
URBCNT5
URBCNT6
URBCNT7
-100 -
W83877TF/W83877TG
URBCNT7 - URBCNT0 (Bit 7 - bit 0): UART B idle timer count.
This register is used to specify the initial value of UART B idle timer. Once UART B enters the working
state (that is, after any access to this device, any IRQ, and any external input), the power down
machine of UART B reloads this count value and the idle timer counts down. When the timer counts
down to zero, UART B enters the power down state ,i.e., sleeping state. If this register is set to 00H,
the power down function will be invalid. The time resolution of this value is minute or second, which is
defined by the TMIN_SEL bit of CR3A. Note that (1). this register is valid only when the power
management function of UART B is enabled, that is, CHIPPME=1 (CR32 bit 7) and URBPME=1
(CR32 bit 0), (2). If the register is set to 00H, UART B will remain in the current state(working or
sleeping).
11.2.42 Configuration Register 37 (CR37), default=00H
When the device is in Extended Function mode and EFIR is 37H, the CR37 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
FDCCNT0
FDCCNT1
FDCCNT2
FDCCNT3
FDCCNT4
FDCCNT5
FDCCNT6
FDCCNT7
FDCCNT7 - FDCCNT0 (Bit 7 - bit 0): FDC idle timer count.
This register is used to specify the initial value of FDC idle timer. Once FDC enters the working state
(that is, after any access to this device, any IRQ, and any external input), the power down machine of
FDC reloads this count value and the idle timer counts down. When the timer counts down to zero,
FDC enters the power down state ,i.e., sleeping state. If this register is set to 00H, the power down
function will be invalid. The time resolution of this value is minute or second, which is defined by the
TMIN_SEL bit of the CR3A. Note that (1). this register is valid only when the power management
function of FDC is enabled, that is, CHIPPME=1 (CR32 bit 7) and FDCPME=1 (CR32 bit 2), (2). If the
register is set to 00H, FDC will remain in the current state(working or sleeping).
11.2.43 Configuration Register 38 (CR38), default=00H
When the device is in Extended Function mode and EFIR is 38H, the CR38 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
PRTCNT0
PRTCNT1
PRTCNT2
PRTCNT3
PRTCNT4
PRTCNT5
PRTCNT6
PRTCNT7
-101-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
PRTCNT7 - PRTCNT0 (Bit 7 - bit 0): printer port idle timer count.
This register is used to specify the initial value of the printer port idle timer. Once the printer port
enters the working state (that is, after any access to this device, any IRQ, and any external input), the
power down machine of the printer port reloads this count value and this idle timer counts down.
When the timer counts down to zero, printer port enters the power down state ,i.e., sleeping state. If
this register is set to 00H, the power down function will be invalid. The time resolution of this value is
minute or second, which is defined by the TMIN_SEL bit of CR3A. Note that (1). this register is valid
only when the power management function of the printer port is enabled, that is, CHIPPME=1 (CR32
bit 7) and PRTPME=1 (CR32 bit 3), (2). If the register is set to 00H, the printer port will remain in the
current state(working or sleeping).
11.2.44 Configuration Register (CR39), default=00H
When the device is in Extended Function mode and EFIR is 39H, the CR39 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
2
3
1
0
GSBCNT0
GSBCNT1
GSBCNT2
GSBCNT3
GSBCNT4
GSBCNT5
GSBCNT6
GSBCNT7
GSBCNT7 - GSBCNT0 (Bit 7 - bit 0): global stand-by idle timer count.
Once all devices of the chip (including UART A, UART B, FDC and the printer port) are in the power
down state, the power down machine of W83877TF/TG chip loads this register value and counts
down. When the timer counts to zero, the whole chip enters the power down state, i.e., sleeping state.
If this register is set to 0, the power down function will be invalid. The time resolution of this register
value is minute or second, which is defined by the TMIN_SEL bit of CR3A. Note that (1). this register
is valid when the CHIPPME = 1 (CR32 bit 7), and (2) If the register is set to 00H, W83877TF/TG chip
will remain in the current state(working or sleeping).
11.2.45 Configuration Register 3A (CR3A), default=00H
When the device is in Extended Function mode and EFIR is 3AH, the CR3A register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
UPULLEN
SMI_EN
reserved
reserved
reserved
TMIN_SEL
reserved
reserved
Bit 7 - bit 6 : Reserved, fixed at 0.
-102 -
W83877TF/W83877TG
TMIN_SEL (Bit 5): Time resolution of the auto power machines of all devices.
CR35 to CR39 store the initial counts of the devices.
0
one second
1
one minute
Bit 4 - bit 2: Reserved, fixed at 0.
SMI_EN (Bit 1): SMI output pin enable.
While an SMI event is raised on the output of the SMI logic, this bit determines whether the SMI
interrupt will be generated on the SMI output SMI pin and on the Serial IRQ IRQSER pin while in
Serial IRQ mode.
0
disable
1
enable
UPULLEN (Bit 0): Enable the pull up of IRQSER pin in Serial IRQ mode.
0
disable the pull up of IRQSER pin.
1
enable the pull up of IRQSER pin.
11.2.46 Configuration Register 3B (CR3B), default=00H
Reserved for testing. Should be kept all 0's.
11.2.47 Configuration Register 40 (CR40), default=00H
When the device is in Extended Function mode and EFIR is 40H, the CR40 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBIDLSTS
URAIDLSTS
FDCIDLSTS
PRTIDLSTS
reserved
reserved
reserved
reserved
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Devices' idle status.
These bits indicate that the individual device's idle timer expires due to no I/O access, IRQ, and
external input to the device respectively. These 4 bits are controlled by the printer port, FDC, UART A,
and UART B power down machines individually. The bits are set/cleared by W83877TF/TG
automatically. Writing a 1 can also clear this bit, and writing a 0 has no effect.
-103-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
PRTIDLSTS (Bit 3): printer port idle status.
0
printer port is now in the working state.
1
printer port is now in the sleeping state due to no printer port access, IRQ, DMA
acknowledge, and no transition on BUSY, ACK , PE, SLCT, and ERR pins.
FDCIDLSTS (Bit 2): FDC idle status.
0
FDC is now in the working state.
1
FDC is now in the sleeping state due to no FDC access, no IRQ, no DMA
acknowledge, and no enabling of the motor enable bits in the DOR register.
URAIDLSTS (Bit 1): UART A idle status.
0
UART A is now in the working state.
1
UART A is now in the sleeping state due to no UART A access, no IRQ, the
receiver is now waiting for a start bit, the transmitter shift register is now empty,
and no transition on MODEM control input lines.
URBIDLSTS (Bit 0): UART B idle status.
0
UART B is now in the working state.
1
UART B is now in the sleeping state due to no UART B access, no IRQ, the
receiver is now waiting for a start bit, the transmitter shift register is now empty,
and no transition on MODEM control input lines.
11.2.48 Configuration Register 41 (CR41), default=00H
When the device is in Extended Function mode and EFIR is 41H, the CR41 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBTRAPSTS
URATRAPSTS
FDCTRAPSTS
PRTTRAPSTS
reserved
reserved
reserved
reserved
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Devices' trap status.
These bits indicate that the individual device wakes up due to any I/O access, IRQ, and external input
to the device respectively. The device's idle timer reloads the initial count value from CR35-CR39,
depending on which device wakes up. These 4 bits are controlled by the printer port, FDC, UART A,
and UART B power down machines individually. The bits are set/cleared by W83877TF/TG
automatically. Writing a 1 can also clear this bit, and writing a 0 has no effect.
-104 -
W83877TF/W83877TG
PRTTRAPSTS (Bit 3): printer port trap status.
0
the printer port is now in the sleeping state.
1
the printer port is now in the working state due to any printer port access, any
IRQ, any DMA acknowledge, and any transition on BUSY, ACK , PE, SLCT,
and ERR pins.
FDCTRAPSTS (Bit 2): FDC trap status.
0
FDC is now in the sleeping state.
1
FDC is now in the working state due to any FDC access, any IRQ, any DMA
acknowledge, and any enabling of the motor enable bits in the DOR register.
URATRAPSTS (Bit 1): UART A trap status.
0
UART A is now in the sleeping state.
1
UART A is now in the working state due to any UART A access, any IRQ, the
receiver begins receiving a start bit, the transmitter shift register begins
transmitting a start bit, and any transition on MODEM control input lines.
URBTRAPSTS (Bit 0): UART B trap status.
0
UART B is now in the sleeping state.
1
UART B is now in the working state due to any UART B access, any IRQ, the
receiver begins receiving a start bit, the transmitter shift register begins
transmitting a start bit, and any transition on MODEM control input lines.
11.2.49 Configuration Register 42 (CR42), default=N/A
When the device is in Extended Function mode and EFIR is 42H, the CR42 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBIRQSTS
URAIRQSTS
FDCIRQSTS
PRTIRQSTS
reserved
reserved
reserved
reserved
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Device's IRQ status .
These bits indicate the IRQ pin status of the individual device respectively. The device's IRQ status bit
is set or cleared at their source device, writing a 1 or 0 has no effect.
-105-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
PRTIRQSTS (Bit 3) : printer port IRQ status. While the IRQ type of printer port is edge trigger-type,
this bit will set and reset immediately. As the software reads this bit, it indicates low level. The
software must read the IRQ status bit in the printer port device register to correctly identify whether the
printer port IRQ occurs.
FDCIRQSTS (Bit 2) : FDC IRQ status.
URAIRQSTS (Bit 1) : UART A IRQ status.
URBIRQSTS (Bit 0) : UART B IRQ status.
11.2.50 Configuration Register 43 (CR43), default=00H
When the device is in Extended Function mode and EFIR is 43H, the CR43 register can be accessed
through EFDR. This register is reserved.
11.2.51 Configuration Register 44 (CR44), default=00H
When the device is in Extended Function mode and EFIR is 44H, the CR44 register can be accessed
through EFDR. This register is reserved.
11.2.52 Configuration Register 45 (CR45), default=00H
When the device is in Extended Function mode and EFIR is 45H, the CR45 register can be accessed
through EFDR. The bit definitions are as follows:
7
6
5
4
3
2
1
0
URBIRQEN
URAIRQEN
FDCIRQEN
PRTIRQEN
reserved
reserved
reserved
reserved
Bit 7 - bit 4 : Reserved, fixed at 0.
Bit 3 - bit 0 : Enable bits of the SMI generation due to the device's IRQ.
These bits enable the generation of an SMI interrupt due to any IRQ of the devices respectively.
These 4 bits control the printer port, FDC, UART A, and UART B SMI logic's individually. The SMI
logic output for the IRQs is as follows:
SMI logic output = (URBIRQEN and URBIRQSTS) or (URAIRQEN and URAIRQSTS) or (FDCIRQEN
and FDCIRQSTS) or (PRTIRQEN and PRTIRQSTS)
If any device's IRQ is raised, the corresponding IRQ status bit in CR42 is set. If the device's enable bit
is set and SMI_EN(in CR3A) and CHIPPME(in CR32) is both set, then SMI interrupt occurs on the
SMI output pin.
PRTIRQEN (Bit 3):
0
disable the generation of an SMI interrupt due to the printer port's IRQ.
1
enable the generation of an SMI interrupt due to the printer port's IRQ.
-106 -
W83877TF/W83877TG
FDCIRQEN (Bit 2):
0
disable the generation of an SMI interrupt due to the FDC's IRQ.
1
enable the generation of an SMI interrupt due to the FDC's IRQ.
URAIRQEN (Bit 1):
0
disable the generation of an SMI interrupt due to the UART A's IRQ.
1
enable the generation of an SMI interrupt due to the UART A's IRQ.
URBIRQEN (Bit 0):
0
disable the generation of an SMI interrupt due to the UART B's IRQ.
1
enable the generation of an SMI interrupt due to the UART B's IRQ.
11.2.53 Bit Map Configuration Registers
Table 11-1: Bit Map of Configuration Registers
Register
CR0
CR1
CR2
CR3
CR4
CR5
CR6
CR7
CR8
CR9
CRA
CRB
CRC
CRD
CR10
CR11
CR12
CR13
CR14
CR15
CR16
CR17
CR18
CR19
CR20
Power-on
Reset Value
0000 0000
0000 0000
0000 0000
0011 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 1010
0000 0000
0000 1100
0010 1000
1010 0011
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
00ss 0s0s1
0000 0000
0000 0000
0000 0000
1111 11002
D7
0
ABCHG
0
0
PRTPWD
0
0
FDD D T1
0
PRTMODS2
0
0
TURA
SIRTX1
GIO0AD7
G0CADM1
GIO1AD7
G1CADM1
GIOP0MD2
GIOP1MD2
0
D6
0
0
0
0
0
0
0
FDD D T0
0
LOCKREG
0
Tx4WC
TURB
SIRTX0
GIO0AD6
G0CADM0
GIO1AD6
G1CADM0
GIOP0MD1
GIOP1MD1
0
D5
0
0
0
EPPVER
URAPWD
0
SEL4FDD
FDD C T1
DISFDDWR
EN3MODE
0
Rx4WC
HEFERE
SIRRX1
GIO0AD5
0
GIO1AD5
0
GIOP0MD0
GIOP1MD0
G1IQSEL
D4
0
0
0
0
URBPWD
0
FIPURDWN
FDD C T0
SWWP
0
0
ENIFCHG
0
SIRRX0
GIO0AD4
0
GIO1AD4
0
GIO0CSH
GIO1CSH
G0IQSEL
D3
PRTMODS1
0
0
0
PRTTRI
ECPFTHR3
FDCPWD
FDD B T1
MEDIA 1
CHIP ID 3
0
IDENT
URIRSEL
HDUPLX
GIO0AD3
0
GIO1AD3
0
GCS0IOR
GCS1IOR
0
D2
PRTMODS0
0
0
0
0
ECPFTHR2
0
FDD B T0
MEDIA 0
CHIP ID 2
0
MFM
0
IRMODE2
GIO0AD2
GIO0AD10
GIO1AD2
GIO1AD10
GCS0IOW
GCS1IOW
PNPCVS
D1
0
0
0
SUAMIDI
URATRI
ECPFTHR1
FDCTRI
FDD A T1
BOOT 1
CHIP ID 1
0
INVERTZ
RX2INV
IRMODE1
GIO0AD1
GIO0AD9
GIO1AD1
GIO1AD9
GDA0OPI
GDA1OPI
0
D0
IPD
0
0
SUBMIDI
URBTRI
ECPFTHR0
0
FDD A T0
BOOT 0
CHIP ID 0
0
DRV2EN
TX2INV
IRMODE0
GIO0AD0
GIO0AD8
GIO1AD0
GIO1AD8
GDA0IPI
GDA1IPI
HEFRAS
0
SHARH
0
FDCAD7
0
SHARG
0
FDCAD6
0
SHARF
0
FDCAD5
PRIRQOD
SHARE
0
FDCAD4
DSFDLGRQ
SHARD
0
FDCAD3
DSPRLGRQ
SHARC
0
FDCAD2
DSUALGRQ
SHARB
FASTA
0
DSUBLGRQ
SHARA
FASTB
0
CR23
1101 11102
PRTAD7
PRTAD6
PRTAD5
PRTAD4
PRTAD3
PRTAD2
PRTAD1
PRTAD0
CR24
1111 11102
URAAD7
URAAD6
URAAD5
URAAD4
URAAD3
URAAD2
URAAD1
0
CR25
1011 11102
URBAD7
URBAD6
URBAD5
URBAD4
URBAD3
URBAD2
URBAD1
0
CR26
0010 00112
FDCDQS3
FDCDQS2
FDCDQS1
FDCDQS0
PRTDQS3
PRTDQS2
PRTDQS1
PRTDQS0
-107-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
Bit Map Configuration Registers, continued
Register
Power-on
Reset Value
D7
D6
D5
D4
D3
D2
D1
D0
CR27
0000 01012
ECPIRQx2
ECPIRQx1
ECPIRQx0
0
PRTIQS3
PRTIQS2
PRTIQS1
PRTIQS0
CR28
0100 00112
URAIQS3
URAIQS2
URAIQS1
URAIQS0
URBIQS3
URBIQS2
URBIQS1
URBIQS0
CR29
0110 00002
0000 0000
0000 0000
FDCIQS3
FDCIQS2
FDCIQS1
FDCIQS0
IQNIQS3
IQNIQS2
IQNIQS1
IQNIQS0
CR2C
CR2D
0
0
0
0
0
DRTB 1
0
DRTB 0
CR31
CR32
CR33
CR34
CR35
CR36
CR37
CR38
CR39
CR3A
CR40
CR41
0000 0s00
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
SCIIRQ3
CHIPPME
PM1AD7
GPEAD7
URACNT7
URBCNT7
FDCCNT7
PRTCNT7
GSBCNT7
0
0
0
SCIIRQ2
0
PM1AD6
GPEAD6
URACNT6
URBCNT6
FDCCNT6
PRTCNT6
GSBCNT6
0
0
0
0
DISPRECOM1
SCIIRQ1
0
PM1AD5
GPEAD5
URACNT5
URBCNT5
FDCCNT5
PRTCNT5
GSBCNT5
TMIN_SEL
0
0
SCIIRQ0
0
PM1AD4
GPEAD4
URACNT4
URBCNT4
FDCCNT4
PRTCNT4
GSBCNT4
0
0
0
CR42
CR43
CR44
CR45
0000 0000
0000 0000
0000 0000
0000 0000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CLKINSEL
0
0
DISDRTA 1
DRTA 0
PRECOM0
0
IRQMODS
0
0
PRTPME
FDCPME
URAPME
URBPME
PM1AD3
PM1AD2
0
0
GPEAD3
GPEAD2
GPEAD1
0
URACNT3
URACNT2
URACNT1
URACNT0
URBCNT3
URBCNT2
URBCNT1
URBCNT0
FDCCNT3
FDCCNT2
FDCCNT1
FDCCNT0
PRTCNT3
PRTCNT2
PRTCNT1
PRTCNT0
GSBCNT3
GSBCNT2
GSBCNT1
GSBCNT0
0
0
SMI_EN
UPULLEN
PRTIDLSTS FDCIDLSTS URAIDLSTS URBIDLSTS
PRTTRAPS FDCTRAPS URATRAPS URBTRAPS
TS
TS
TS
TS
PRTIRQSTS FDCIRQSTS URAIRQSTS URBIRQSTS
0
0
0
0
0
0
0
0
PRTIRQEN FDCIRQEN URAIRQEN URBIRQEN
Notes:
1. 's' means its value depends on corresponding power-on setting pin.
2. These default values are valid when CR16 bit 2 is 1 during power-on reset; They will be all 0's if CR16 bit 2 is 0.
-108 -
W83877TF/W83877TG
11.3 ACPI Registers Features
W83877TF/TG supports both the ACPI and legacy power management's. The switch logic of the
power management block generates an SMI interrupt in the legacy mode and an SCI interrupt in the
ACPI mode. For the legacy mode, the SMI_EN bit is used. If it is set, it routes the power management
events from the SMI interrupt logic to the SMI output pin. For the ACPI mode, the SCI_EN bit is used.
If it is set, it route the power management events to the SCI interrupt logic. The SMI_EN bit is located
in the CR3A register and the SCI_EN bit is located in the PM1 register block. See the following figure
for illustration.
SMI_EN
IRQs
SMI Logic
SMI events
IRQs
0
PM Timer
SMI output
Logic
SMI
SCI output
Logic
SCI
1
SCI_EN
SCI events
SCI Logic
IRQs
Device Idle
Timers
WAK_STS
Sleep/Wake
State machine
Clock
Control
Device Trap
Global STBY
Timer
The SMI interrupt is routed to pin SMI , which is dedicated for the SMI interrupt output. Another way to
output the SMI interrupt is to route to pin IRQSER, which is the signal pin in the Serial IRQ mode. The
SCI interrupt is routed to pin SCI , which is dedicated for the SCI function. The other way to output the
SCI interrupt is to route to one interrupt request signal pin IRQA~H, which is selected through CR31
bit[7:4]. Another way is output the SCI interrupt is to route to pin IRQSER.
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Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
SMI to SCI/SCI to SMI and Bus Master
For the process of generating an interrupt from SMI to SCI or from SCI to SMI, see the following figure
for illustration.
clear
from SMI to SCI
BIOS_RLS
GBL_STS
set
To SCI Logic
GBL_EN
clear
from SCI to SMI
GBL_RLS
BIOS_STS
set
To SMI Logic
BIOS_EN
clear
Bus Master SCI
BM_CNTPL
BM_STS
set
To SCI Logic
BM_RLD
: Status bit
: Enable bit
For the BIOS software to raise an event to the ACPI software, BIOS_RLS, GBL_EN, and GBL_STS
bits are involved. GBL_EN is the enable bit and the GBL_STS is the status bit. Both are controlled by
the ACPI software. If BIOS_RLS is set by the BIOS software and GBL_EN is set by the ACPI
software, an SCI interrupt is raised. Writing a 1 to BIOS_RLS sets it to logic 1 and also sets
GBL_STS to logic 1; Writing a 0 to BIOS_RLS has no effect. Writing a 1 to GBL_STS clears it to logic
0 and also clears BIOS_RLS to logic 0; writing a 0 to GBL_STS has no effect.
For the ACPI software to raise an event to the BIOS software, GBL_RLS, BIOS_EN, and BIOS_STS
bits are involved. BIOS_EN is the enable bit and the BIOS_STS is the status bit. Both are controlled
by the BIOS software. If GBL_RLS is set by the ACPI software and BIOS_EN is set by the BIOS
software, an SMI is raised. Writing a 1 to GBL_RLS sets it to logic 1 and also sets BIOS_STS to logic
1; Writing a 0 to GBL_RLS has no effect. Writing a 1 to BIOS_STS clears it to logic 0 and also clears
GBL_RLS to logic 0; writing a 0 to BIOS_STS has no effect.
For the bus master to raise an event to the ACPI software, BM_CNTRL, BM_RLD, and BM_STS bits
are involved. Both BM_RLD and BM_STS are controlled by the ACPI software. If BM_CNTRL is set
by the BIOS software and BM_RLD is set by the ACPI software, an SCI interrupt is raised. Writing a 1
to BM_CNTRL sets it to logic 1 and also sets BM_STS to logic 1; Writing a 0 to BM_CNTRL has no
effect. Writing a 1 to BM_STS clears it to logic 0 and also clears BM_CNTRL to logic 0; writing a 0 to
BM_STS has no effect.
-110 -
W83877TF/W83877TG
Power Management Timer
In the ACPI specification, it requires a power management timer. The power management timer is a
24-bit fixed rate free running count-up timer that runs off a 3.579545MHZ clock. The power
management timer has the corresponding status bit (TMR_STS) and enable bit (TMR_EN). The
TMR_STS bit is set any time the last bit of the timer (bit 23) goes from 0 to 1 or from 1 to 0. If the
TMR_EN bit is set, the setting of the TMR_STS bit will generate an SCI interrupt. Three registers are
used to read the timer value, they are located in the PM1 register block. The power management timer
has one enable bit (TMR_ON) to turn if on or off. The TMR_ON is located in GPE register block. If it is
cleared to 0, the power management timer function would not work. There are no timer reset
requirements, except that the timer should function after power-up. See the following figure for
illustration.
TMR_ON
3.579545 MHz
24 bit
counter
Bits (23-0)
TMR_STS
To SCI Logic
24
TMR_EN
TMR_VAL
11.4 ACPI Registers (ACPIRs)
The ACPI register model consists of the fixed register blocks that perform the ACPI functions. A
register block may be a event register block which deals with ACPI events or a control register block
which deals with control features. The ordering in the event register block is the status register,
followed by the enable register.
Each event register, if implemented, contains two two register: a status register and an enable
register, both in 16-bit size. The status register indicates what defined function needs the ACPI
System Control Interrupt (SCI). While the hardware event occurs, the defined status bit is set.
However, to generate the SCI, the associated enable bit is required to be set. If the enable bit is not
set, the software can examine the state of the hardware event by reading the status bit without
generating an SCI interrupt.
Any status bit, unless otherwise noted, can only be set by some defined hardware event. It is cleared
by writing a 1 to its bit position and writing a 0 has no effect. Except for some special status bits, every
status bit has an associated enable bit in the same bit position in the enable register. Those status bits
which have no respective enable bit are read for special purposes. Revered or un-implemented
enable bits always return zero, and writing to these bits should have no effect.
The control bit in the control register provides some special control functions over the hardware event,
or some special control over SCI event. Reversed or un-implemented control bits always return zero,
and writing to those bits should have no effect.
Table 11-4 lists the PM1 register block and the relative locations of the registers within it. The base
address of PM1 register block is named as PM1a_EVT_BLK in the ACPI specification. The based
address should range from 01,0000,0000b to 11,1111,0000b ,i.e., 100H ~ 3F0H, where bit 1 and bit 0
of PM1 register block should be set to 0 and the based address is in the 16-byte alignment.
Table 11-5 lists the GPE register block and the relative locations within it. The base address of power
management event block GPE is named as GPE0_BLK in the ACPI specification. The based address
should range from 01,0000,0000b to 11,1111,1000b ,i.e., 100H ~ 3F8H, where bit 0 of the base
address should be set to 0 and the base address is in the 8-byte alignment.
-111-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.4.1
Power Management 1 Status Register 1 (PM1STS1)
Register Location:
<CR33> System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
TMR_STS
Reserved
Reserved
Reserved
BM_STS
GBL_STS
Reserved
Reserved
BIT
NAME
0
TMR_STS
1-3
4
Reserved
BM_STS
5
GBL_STS
6-7
Reserved
11.4.2
DESCRIPTION
This bit is the timer carry status bit. This bit gets set anytime the bit 23 of the
24-bit counter changes(whenever the MSB changes from low to high or high
to low). While TMR_EN and TMR_STS are set a power magnet event is
raised. This bit is only set by hardware and can only be cleared by the
software writing a 1 to this bit position. Writing a 0 has no effect.
Reserved.
This is the bus master status bit. Writing a 1 to BM_CNTRL also sets
BM_STS. Writing a 1 clears this bit and also clears BM_CNTRL. Writing a 0
has no effect.
This is the global status bit. This bit is set when the BIOS want the attention
of the SCI handler. BIOS sets this bit by setting BIOS_RLS and can only be
cleared by software writing a 1 to this bit position. Writing a 1 to this bit
position also clears BIOS_RLS. Writing a 0 has no effect.
Reserved. These bits always return a value of zero.
Power Management 1 Status Register 2 (PM1STS2)
Register Location:
<CR33>+1H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
WAK_STS
-112 -
W83877TF/W83877TG
BIT
NAME
DESCRIPTION
0-6
Reserved
Reserved.
7
WAK_STS
This bit is set when the system is in the sleeping state and an enabled
resume event occurs. Upon setting this bit, the sleeping/working state
machine will transition the system to the working state. This bit is only set by
hardware and is cleared by software writing a 1 to this bit position or by the
sleeping/working state machine automatically upon the global standby timer
expires. Writing a 0 has no effect. Once the WAK_STS is cleared and all
devices have been in sleeping state, the whole chip enters the sleeping
state.
11.4.3
Power Management 1 Enable Register 1(PM1EN1)
Register Location:
<CR33>+2H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
TMR_EN
Reserved
Reserved
Reserved
GBL_EN
Reserved
Reserved
Reserved
BIT
NAME
DESCRIPTION
0
TMR_EN
This is the timer carry interrupt enable bit. When this bit is set then an SCI
event is generated anytime the TMR_STS bit is set. When this bit is reset
then no interrupt is generated when the TMR_STS bit is set.
1-4
Reserved
Reserved. These bits always return a value of zero.
5
GBL_EN
The global enable bit. When both the GBL_EN bit and the GBL_STS bit are
set, an SCI interrupt is raised.
6-7
Reserved
Reserved.
11.4.4
Power Management 1 Enable Register 2 (PM1EN2)
Register Location:
<CR33>+3H System I/O Space
Default Value:
00h
Attribute:
Size:
Read/write
8 bits
-113-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
11.4.5
DESCRIPTION
Reserved. These bits always return a value of zero.
Power Management 1 Control Register 1 (PM1CTL1)
Register Location:
<CR33>+4H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
SCI_EN
BM_RLD
GBL_RLD
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
NAME
DESCRIPTION
0
SCI_EN
Selects the power management event to be either an SCI or an SMI
interrupt. When this bit is set, then the power management events will
generate an SCI interrupt. When this bit is reset and SMI_EN bit is set, then
the power management events will generate an SMI interrupt.
1
BM_RLD
This is the bus master reload enable bit. If this bit is set and BM_CNTRL is
set, an SCI interrupt is raised.
2
GBL_RLS
The global release bit. This bit is used by the ACPI software to raise an
event to the BIOS software. The BIOS software has a corresponding enable
and status bit to control its ability to receive the ACPI event. Setting
GBL_RLS sets BIOS_STS, and it generates an SMI interrupt if BIOS_EN is
also set.
3-7
Reserved
Reserved. These bits always return a value of zero.
-114 -
W83877TF/W83877TG
11.4.6
Power Management 1 Control Register 2 (PM1CTL2)
Register Location:
<CR33>+5H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
11.4.7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
Power Management 1 Control Register 3 (PM1CTL3)
Register Location:
<CR33>+6H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
-115-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.4.8
Power Management 1 Control Register 4 (PM1CTL4)
Register Location:
<CR33>+7H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
11.4.9
DESCRIPTION
Reserved. These bits always return a value of zero.
Power Management 1 Timer 1 (PM1TMR1)
Register Location:
<CR33>+8H System I/O Space
Default Value:
00h
Attribute:
Read only
Size:
8 bits
7
6
5
4
3
2
1
0
TMR_VAL0
TMR_VAL1
TMR_VAL2
TMR_VAL3
TMR_VAL4
TMR_VAL5
TMR_VAL6
TMR_VAL7
BIT
0-7
NAME
TMR_VAL
DESCRIPTION
This read-only field returns the running count of the power management
timer. This is a 24-bit counter that runs off of a 3.579545 MHZ clock, and
counts while in the system working state. The timer is reset and then
continues counting until the CLKIN input the the chip is stopped. If the clock
is restarted without a MR reset, then the counter will continue counting from
where it stopped. The TMR_STS bit is set any time the last bit of the timer
(bit 23) goes from 0 to 1 or from 1 to 0. If the TMR_EN bit is set, the setting
of the TMR_STS bit will generate an SCI interrupt.
-116 -
W83877TF/W83877TG
11.4.10 Power Management 1 Timer 2 (PM1TMR2)
Register Location:
<CR33>+9H System I/O Space
Default Value:
00h
Attribute:
Read only
Size:
8 bits
7
6
5
4
3
2
1
0
TMR_VAL8
TMR_VAL9
TMR_VAL10
TMR_VAL11
TMR_VAL12
TMR_VAL13
TMR_VAL14
TMR_VAL15
BIT
0-7
NAME
TMR_VAL
DESCRIPTION
This read-only field returns the running count of the power management
timer. This is a 24-bit counter that runs off of a 3.579545 MHZ clock, and
counts while in the system working state. The timer is reset and then
continues counting until the CLKIN input the the chip is stopped. If the clock
is restarted without a MR reset, then the counter will continue counting from
where it stopped. The TMR_STS bit is set any time the last bit of the timer
(bit 23) goes from 0 to 1 or from 1 to 0. If the TMR_EN bit is set, the setting
of the TMR_STS bit will generate an SCI interrupt.
11.4.11 Power Management 1 Timer 3 (PM1TMR3)
Register Location:
<CR33>+AH System I/O Space
Default Value:
00h
Attribute:
Read only
Size:
8 bits
7
6
5
4
3
2
1
0
TMR_VAL16
TMR_VAL17
TMR_VAL18
TMR_VAL19
TMR_VAL20
TMR_VAL21
TMR_VAL22
TMR_VAL23
-117-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
BIT
0-7
NAME
TMR_VAL
DESCRIPTION
This read-only field returns the running count of the power management
timer. This is a 24-bit counter that runs off of a 3.579545 MHZ clock, and
counts while in the system working state. The timer is reset and then
continues counting until the CLKIN input the the chip is stopped. If the clock
is restarted without a MR reset, then the counter will continue counting from
where it stopped. The TMR_STS bit is set any time the last bit of the timer
(bit 23) goes from 0 to 1 or from 1 to 0. If the TMR_EN bit is set, the setting
of the TMR_STS bit will generate an SCI interrupt.
11.4.12 Power Management 1 Timer 4 (PM1TMR4)
Register Location:
<CR33>+BH System I/O Space
Default Value:
00h
Attribute:
Read only
Size:
8 bits
7
6
5
4
2
3
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
11.4.13 General Purpose Event 0 Status Register 1 (GP0STS1)
Register Location:
<CR34> System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
URBSCISTS
URASCISTS
FDCSCISTS
PRTSCISTS
Reserved
Reserved
Reserved
Reserved
-118 -
W83877TF/W83877TG
These bits indicate the status of the SCI input, which is set when the device's IRQ is raised. If the
corresponding enable bit in the SCI interrupt enable register (in GP0EN1) is set, an SCI interrupt is
raised and routed to the output pin. Writing a 1 clears the bit, and writing a 0 has no effect. If the bit is
not cleared, new IRQ for the SCI logic input is ignored, therefore no SCI interrupt is raised.
BIT
NAME
DESCRIPTION
0
URBSCISTS
UART B SCI status, which is set by the UART B IRQ.
1
URASCISTS
UART A SCI status, which is set by the UART A IRQ.
2
FDCSCISTS
FDC SCI status, which is set by the FDC IRQ.
3
PRTSCISTS
PRT SCI status, which is set by the printer port IRQ.
4-7
Reserved
Reserved.
11.4.14 General Purpose Event 0 Status Register 2 (GP0STS2)
Register Location:
<CR34>+1H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
11.4.15 General Purpose Event 0 Enable Register 1 (GP0EN1)
Register Location:
<CR34> +2H System I/O Space
Default Value:
00h
Attribute:
Size:
Read/write
8 bits
-119-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
7
6
5
4
2
3
1
0
URBSCIEN
URASCIEN
FDCSCIEN
PRTSCIEN
Reserved
Reserved
Reserved
Reserved
These bits are used to enable the device's IRQ sources onto the SCI logic. The SCI logic output for
the IRQs is as follows:
SCI logic output = (URBSCIEN and URBSCISTS) or (URASCIEN and URASCISTS) or (FDCSCIEN
and FDCSCISTS) or (PRTSCIEN and PRTSCISTS)
BIT
NAME
DESCRIPTION
0
URBSCIEN
UART B SCI enable, which controls the UART B IRQ for SCI.
1
URASCIEN
UART A SCI enable, which controls the UART A IRQ for SCI.
2
FDCSCIEN
FDC SCI enable, which controls the FDC IRQ for SCI.
3
PRTSCIEN
printer port SCI enable, which controls the printer port IRQ for SCI.
4-7
Reserved
Reserved.
11.4.16 General Purpose Event 0 Enable Register 2 (GP0EN2)
Register Location:
<CR34>+3H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
-120 -
W83877TF/W83877TG
11.4.17 General Purpose Event 1 Status Register 1 (GP1STS1)
Register Location:
<CR34>+4H System I/O Space
Default Value:
00h
Attribute:
Read/write
Size:
8 bits
7
6
5
4
3
2
1
0
BIOS_STS
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
NAME
DESCRIPTION
0
BIOS_STS
The BIOS status bit. This bit is set when GBL_RLS is set. If BIOS_EN is set,
setting GBL_RLS will raise an SMI event. Writing a 1 to its bit location clears
BIOS_STS and also clears GBL_RLS. Writing a 0 has no effect.
1-7
Reserved
Reserved.
11.4.18 General Purpose Event 1 Status Register 2 (GP1STS2)
Register Location:
Default Value:
Attribute:
Size:
<CR34>+5H System I/O Space
00h
Read/write
8 bits
7
6
5
4
3
2
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
0-7
NAME
Reserved
DESCRIPTION
Reserved. These bits always return a value of zero.
-121-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
11.4.19 General Purpose Event 1 Enable Register 1 (GP1EN1)
Register Location:
Default Value:
Attribute:
Size:
<CR34>+6H System I/O Space
00h
Read/write
8 bits
7
6
5
4
2
3
1
0
BIOS_EN
TMR_ON
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BIT
NAME
0
BIOS_EN
1
TMR_ON
2-7
Reserved
DESCRIPTION
This bit is raise the SMI event. When this bit is set and the ACPI software
writes a 1 to the GBL_RLS bit, an SMI event is raised on the SMI logic
output.
This bit is used to turn on the power management timer. 1: timer on ; 0: timer
off.
Reserved.
11.4.20 General Purpose Event 1 Enable Register 2 (GP1EN2)
Register Location:
Default Value:
Attribute:
Size:
<CR34>+7H System I/O Space
00h
Read/write
8 bits
7
6
5
4
3
2
1
0
BIOS_RLS
BM_CNTRL
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
-122 -
W83877TF/W83877TG
BIT
NAME
DESCRIPTION
0
BIOS_RLS
The BIOS release bit. This bit is used by the BIOS software to raise an event
to the ACPI software. The ACPI software has a corresponding enable and
status bit to control its ability to receive the ACPI event. Setting BIOS_RLS
sets GBL_STS, and it generates an SCI interrupt if GBL_EN is also set.
Writing a 1 to its bit position sets this bit and also sets the BM_STS bit.
Writing a 0 has no effect. This bit is cleared by writing a 1 to the GBL_STS
bit.
1
BM_CNTRL
This bit is used to set the BM_STS bit and if the BM_RLD bit is also set, then
an SCI interrupt is generated. Writing a 1 sets BM_CNTRL to 1 and also
sets BM_STS. Writing a 0 has no effect. Writing a 1 to BM_STS clears
BM_STS and also clears BM_CNTRL.
Reserved
Reserved.
2-7
11.4.21 Bit Map Configuration Registers
Table 11-4: Bit Map of PM1 Register Block
Register
Address
Power-On
D7
D6
D5
D4
D3
D2
D1
D0
Reset Value
PM1STS1
0
0
GBL_STS
BM_STS
0
0
0
PM1STS2 <CR33>+1H 0000 0000
<CR33>
0000 0000
WAK_STS
0
0
0
0
0
0
TMR_STS
0
PM1EN1 <CR33>+2H 0000 0000
0
0
GBL_EN
0
0
0
0
TMR_EN
PM1EN2 <CR33>+3H 0000 0000
0
0
0
0
0
0
0
0
PM1CTL1 <CR33>+4H 0000 0000
0
0
0
0
0
GBL_RLS
BM_RLD
SCI_EN
PM1CTL2 <CR33>+5H 0000 0000
0
0
0
0
0
0
0
0
PM1CTL3 <CR33>+6H 0000 0000
0
0
0
0
0
0
0
0
PM1CTL4 <CR33>+7H 0000 0000
0
0
0
0
0
0
0
0
PM1TMR1 <CR33>+8H 0000 0000 TMR_VAL7 TMR_VAL6 TMR_VAL5 TMR_VAL4 TMR_VAL3 TMR_VAL2 TMR_VAL1 TMR_VAL0
PM1TMR2 <CR33>+9H 0000 0000 TMR_VAL15 TMR_VAL14 TMR_VAL13 TMR_VAL12 TMR_VAL11 TMR_VAL10 TMR_VAL9 TMR_VAL8
PM1TMR3 <CR33>+AH 0000 0000 TMR_VAL23 TMR_VAL22 TMR_VAL21 TMR_VAL20 TMR_VAL19 TMR_VAL18 TMR_VAL17 TMR_VAL16
PM1TMR4 <CR33>+BH 0000 0000
0
0
0
0
0
0
0
Table 11-5: Bit Map of GPE Register Block
Register
Address
Power-On
D7
D6
D5
D4
0
0
0
0
D3
D2
D1
D0
Reset Value
GP0STS1
<CR34>
0000 0000
PRTSCISTS FDCSCISTS URASCISTS URBSCISTS
GP0STS2 <CR34>+1H 0000 0000
0
0
0
0
0
0
0
0
GP0EN1 <CR34>+2H 0000 0000
0
0
0
0
PRTSCIEN
FDCSCIEN
URASCIEN
URBSCIEN
GP0EN2 <CR34>+3H 0000 0000
0
0
0
0
0
0
0
0
GP1STS1 <CR34>+4H 0000 0000
0
0
0
0
0
0
0
BIOS_STS
GP1STS2 <CR34>+5H 0000 0000
0
0
0
0
0
0
0
0
GP1EN1 <CR34>+6H 0000 0000
0
0
0
0
0
0
TMR_ON
BIOS_EN
GP1EN2 <CR34>+7H 0000 0000
0
0
0
0
0
0
BM_CNTRL
BIOS_RLS
-123-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
12. SPECIFICATIONS
12.1 Absolute Maximum Ratings
PARAMETER
RATING
UNIT
-0.5 to 7.0
V
-0.5 to VDD+0.5
V
0 to +70
°C
-55 to +150
°C
Power Supply Voltage
Input Voltage
Operating Temperature
Storage Temperature
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
12.2 DC CHARACTERISTICS
(Ta = 0° C to 70° C, VDD = 5V ± 10%, VSS = 0V)
PARAMETER
SYM.
MIN.
TYP.
MAX.
UNI
CONDITIONS
I/O8tc - TTL level output pin with source-sink capabilities of 8 mA; CMOS level input voltage
Input Low Voltage
VIL
-0.5
0.3xV
V
Input High Voltage
VIH
0.7xVD
VDD+0
V
Output Low Voltage
VOL
0.4
V
IOL = 8 mA
Output High Voltage
VOH
V
IOH = -8 mA
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
2.4
I/O12t - TTL level bi-directional pin with source-sink capabilities of 12 mA
Input Low Voltage
VIL
-0.5
0.8
V
Input High Voltage
VIH
2.0
VDD+0
V
Output Low Voltage
VOL
0.4
V
IOL = 12 mA
Output High Voltage
VOH
V
IOH = -12 mA
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
2.4
I/O24t - TTL level bi-directional pin with source-sink capabilities of 24 mA
Input Low Voltage
VIL
-0.5
0.8
V
Input High Voltage
VIH
2.0
VDD+0
V
Output Low Voltage
VOL
0.4
V
IOL = 24 mA
Output High Voltage
VOH
V
IOH = -24 mA
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
2.4
-124 -
W83877TF/W83877TG
DC Characteristics, continued
PARAMETER
SY
MIN.
TYP
MAX.
UNIT
CONDITIONS
OUT8t - TTL level output pin with source-sink capabilities of 8 mA
Output Low Voltage
VOL
Output High Voltage
VOH
0.4
2.4
V
IOL = 8 mA
V
IOH = -8 mA
OUT12t - TTL level output pin with source-sink capabilities of 12 mA
Output Low Voltage
VOL
Output High Voltage
VOH
0.4
2.4
V
IOL = 12 mA
V
IOH = -12 mA
OD12 - Open-drain output pin with sink capabilities of 12 mA
Output Low Voltage
VOL
0.4
V
IOL = 12 mA
OD24 - Open-drain output pin with sink capabilities of 24 mA
Output Low Voltage
VOL
0.4
V
IOL = 24 mA
Input Low Voltage
VIL
0.8
V
VDD = 5 V
Input High Voltage
VIH
V
VDD = 5 V
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
INt - TTL level input pin
2.0
INts - TTL level input pin Schmitt-trigger input pin
Input Low Threshold
Vt-
0.5
0.8
1.1
V
VDD = 5 V
Input High Threshold
Vt+
1.6
2.0
2.4
V
VDD = 5 V
Hysteresis (Vt+ - Vt-)
VTH
0.5
1.2
V
VDD = 5 V
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
0.3xVD
V
VDD = 5 V
V
VDD = 5 V
INc- CMOS level input pin
Input Low Voltage
VIL
Input High Voltage
VIH
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
0.7xVD
INcs - CMOS level schmitt-triggered input pin
Input Low Threshold
Vt-
1.3
1.5
1.7
V
VDD = 5 V
Input High Threshold
Vt+
3..2
3.5
3.8
V
VDD = 5 V
Hysteresis (Vt+ - Vt-)
VTH
1.5
2
V
VDD = 5 V
Input High Leakage
ILIH
+10
μA
VIN = VDD
Input Low Leakage
ILIL
-10
μA
VIN = 0V
-125-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
12.3 AC Characteristics
12.3.1
FDC: Data rate = 1 MB/500 KB/300 KB/250 KB/sec.
PARAMETER
SYM.
TEST
CONDITIONS
MIN.
TYP.
(NOTE 1)
MAX.
UNIT
SA9-SA0, AEN, DACK ,
CS , setup time to IOR ↓
TAR
25
nS
SA9-SA0, AEN, DACK ,
hold time for IOR ↑
TAR
0
nS
IOR width
TRR
80
nS
Data access time from IOR
↓
TFD
CL = 100 pf
Data hold from IOR ↓
TDH
CL = 100 pf
10
SD to from IOR ↑
TDF
CL = 100 pf
10
IRQ delay from IOR ↑
TRI
SA9-SA0, AEN, DACK ,
setup time to IOW ↓
TAW
25
nS
SA9-SA0, AEN, DACK ,
hold time for IOW ↑
TWA
0
nS
IOW width
TWW
60
nS
Data setup time to IOW ↑
TDW
60
nS
Data hold time from IOW ↑
TWD
0
nS
IRQ delay from IOW ↑
TWI
80
nS
nS
50
nS
360/570
/675
nS
360/570
/675
nS
μS
DRQ cycle time
TMCY
DRQ delay time DACK ↓
TAM
DRQ to DACK delay
TMA
0
nS
DACK width
TAA
260/430
/510
nS
IOR delay from DRQ
TMR
0
nS
IOW delay from DRQ
TMW
0
nS
27
50
-126 -
nS
W83877TF/W83877TG
AC Characteristics, FDC continued
PARAMETER
SYM.
IOW or IOR response time
from DRQ
TMRW
TEST
CONDITIONS
MIN.
TYP.
(NOTE 1)
MAX.
UNIT
μS
6/12
/20/24
TC width
TTC
135/220
/260
nS
RESET width
TRST
1.8/3/3.
5
μS
INDEX width
TIDX
0.5/0.9
/1.0
μS
DIR setup time to STEP
TDST
1.0/1.6
/2.0
μS
DIR hold time from STEP
TSTD
24/40/4
8
μS
STEP pulse width
TSTP
6.8/11.5
/13.8
7/11.7
/14
7.2/11.9
/14.2
μS
STEP cycle width
TSC
Note 2
Note 2
Note 2
μS
WD pulse width
TWDD
100/185
/225
125/210
/250
150/235
/275
μS
Write precompensation
TWPC
100/138
/225
125/210
/250
150/235
/275
μS
Notes:
1. Typical values for T = 25° C and normal supply voltage.
2. Programmable from 2 mS through 32 mS in 2 mS increments.
-127-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
12.3.2
UART/Parallel Port
PARAMETER
SYMBOL
Delay from Stop to Set Interrupt
TSINT
Delay from IOR Reset Interrupt
TRINT
Delay from Initial IRQ Reset to
Transmit Start
TIRS
Delay from IOW to Reset interrupt
THR
Delay from Initial IOW to interrupt
TSI
Delay from Stop to Set Interrupt
TSTI
Delay from IOR to Reset Interrupt
TIR
TMWO
Delay from IOR to Output
TEST
CONDITIONS
MIN.
MAX.
9/16
UNIT
Baud
Rate
1
μS
8/16
Baud
Rate
175
nS
16/16
Baud
Rate
1/2
Baud
Rate
100 pF Loading
250
nS
100 pF Loading
200
nS
100 pF Loading
1/16
100 pF Loading
9/16
Set Interrupt Delay from Modem
Input
TSIM
250
nS
Reset Interrupt Delay from IOR
TRIM
250
nS
Interrupt Active Delay
TIAD
100 pF Loading
25
nS
Interrupt Inactive Delay
TIID
100 pF Loading
30
nS
100 pF Loading
16
N
Baud Divisor
12.3.3
2 -1
Parallel Port Mode Parameters
PARAMETER
SYM.
MIN.
TYP.
MAX.
UNIT
PD0-7, INDEX , STROBE , AUTOFD Delay from
IOW
t1
100
nS
IRQ Delay from ACK , nFAULT
t2
60
nS
IRQ Delay from IOW
t3
105
nS
IRQ Active Low in ECP and EPP Modes
t4
300
nS
ERROR Active to IRQ Active
t5
105
nS
-128 -
200
W83877TF/W83877TG
12.3.4
EPP Data or Address Read Cycle Timing Parameters
PARAMETER
SYM.
MIN.
MAX.
UNIT
Ax Valid to IOR Asserted
t1
40
nS
IOCHRDY Deasserted to IOR Deasserted
t2
0
nS
IOR Deasserted to Ax Valid
t3
10
IOR Deasserted to IOW or IOR Asserted
t4
40
IOR Asserted to IOCHRDY Asserted
t5
PD Valid to SD Valid
10
nS
0
24
nS
t6
0
75
nS
IOR Deasserted to SD Hi-Z (Hold Time)
t7
0
40
μS
SD Valid to IOCHRDY Deasserted
t8
0
85
nS
WAIT Deasserted to IOCHRDY Deasserted
t9
60
160
nS
PD Hi-Z to PDBIR Set
t10
0
nS
WRITE Deasserted to IOR Asserted
t13
0
nS
WAIT Asserted to WRITE Deasserted
t14
0
185
nS
Deasserted to WRITE Modified
t15
60
190
nS
IOR Asserted to PD Hi-Z
t16
0
50
nS
WAIT Asserted to PD Hi-Z
t17
60
180
nS
Command Asserted to PD Valid
t18
0
nS
Command Deasserted to PD Hi-Z
t19
0
nS
WAIT Deasserted to PD Drive
t20
60
WRITE Deasserted to Command
t21
1
PBDIR Set to Command
t22
0
20
nS
PD Hi-Z to Command Asserted
t23
0
30
nS
Asserted to Command Asserted
t24
0
195
nS
WAIT Deasserted to Command Deasserted
t25
60
180
nS
Time out
t26
10
12
nS
PD Valid to WAIT Deasserted
t27
0
nS
PD Hi-Z to WAIT Deasserted
t28
0
μS
-129-
190
nS
nS
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
12.3.5
EPP Data or Address Write Cycle Timing Parameters
PARAMETER
SYM.
MIN.
Ax Valid to IOW Asserted
t1
40
nS
SD Valid to Asserted
t2
10
nS
IOW Deasserted to Ax Invalid
t3
10
nS
WAIT Deasserted to IOCHRDY Deasserted
t4
0
nS
Command Asserted to WAIT Deasserted
t5
10
nS
IOW Deasserted to IOW or IOR Asserted
t6
40
nS
IOCHRDY Deasserted to IOW Deasserted
t7
0
24
nS
WAIT Asserted to Command Asserted
t8
60
160
nS
IOW Asserted to WAIT Asserted
t9
0
70
nS
PBDIR Low to WRITE Asserted
t10
0
WAIT Asserted to WRITE Asserted
t11
60
185
nS
WAIT Asserted to WRITE Change
t12
60
185
nS
IOW Asserted to PD Valid
t13
0
50
nS
WAIT Asserted to PD Invalid
t14
0
nS
PD Invalid to Command Asserted
t15
10
nS
IOW to Command Asserted
t16
5
35
nS
WAIT Asserted to Command Asserted
t17
60
210
nS
WAIT Deasserted to Command Deasserted
t18
60
190
nS
Command Asserted to WAIT Deasserted
t19
0
10
μS
Time out
t20
10
12
μS
Command Deasserted to WAIT Asserted
t21
0
nS
IOW Deasserted to WRITE Deasserted and PD
invalid
t22
0
nS
-130 -
MAX.
UNIT
nS
W83877TF/W83877TG
12.3.6
Parallel Port FIFO Timing Parameters
PARAMETER
SYMBOL
MIN.
DATA Valid to nSTROBE Active
t1
600
nS
nSTROBE Active Pulse Width
t2
600
nS
DATA Hold from nSTROBE Inactive
t3
450
nS
BUSY Inactive to PD Inactive
t4
80
nS
BUSY Inactive to nSTROBE Active
t5
680
nS
nSTROBE Active to BUSY Active
t6
12.3.7
MAX.
UNIT
500
nS
ECP Parallel Port Forward Timing Parameters
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
nAUTOFD Valid to nSTROBE Asserted
t1
0
60
nS
PD Valid to nSTROBE Asserted
t2
0
60
nS
BUSY Deasserted to nAUTOFD Changed
t3
80
180
nS
BUSY Deasserted to PD Changed
t4
80
180
nS
nSTROBE Deasserted to BUSY Deasserted
t5
0
BUSY Deasserted to nSTROBE Asserted
t6
80
nSTROBE Asserted to BUSY Asserted
t7
0
BUSY Asserted to nSTROBE Deasserted
t8
80
180
nS
SYMBOL
MIN.
MAX.
UNIT
PD Valid to nACK Asserted
t1
0
nS
nAUTOFD Deasserted to PD Changed
t2
0
nS
nAUTOFD Asserted to nACK Asserted
t3
0
nS
nAUTOFD Deasserted to nACK Deasserted
t4
0
nS
nACK Deasserted to nAUTOFD Asserted
t5
80
200
nS
PD Changed to nAUTOFD Deasserted
t6
80
200
nS
12.3.8
nS
200
nS
nS
ECP Parallel Port Reverse Timing Parameters
PARAMETER
-131-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
13. TIMING WAVEFORMS
13.1 FDC
Write Date
Processor Read Operation
WD
SA0-SA9
TWDD
AEN
CS
DACK
TAR
TRA
TRR
IOR
TDH
Index
TFD
TDF
D0-D7
INDEX
TR
IRQ
TIDX
Processor Write Operation
TIDX
Terminal Count
SA0-SA9
AEN
DACK
TAW
TC
TWA
TTC
TWW
IOW
TWD
Reset
TDW
D0-D7
RESET
TWI
IRQ
TRST
DMA Operation
DRQ
Drive Seek operation
TAM
DIR
TMCY
DACK
TAA
TMA
TDST
TMRW
IOW or
TSTP
TSTD
STEP
IOR
TMW (IOW)
TMR (IOR)
TSC
-132 -
W83877TF/W83877TG
13.2 UART/Parallel
Receiver Timing
SIN
(RECEIVER
STAR
INPUT DATA)
DATA BITS
PARITY
(5-8)
STOP
TSINT
IRQ3 or IRQ4
IOR
(READ RECEIVER
TRINT
BUFFER REGISTER)
Transmitter Timing
SERIAL OUT
STAR
(SOUT)
STAR
DATA
(5-8)
PARITY
THRS
STOP
(1-2)
TSTI
IRQ3 or IRQ4
THR
IOW
(WRITE THR)
THR
TSI
TIR
IOR
(READ TIR)
-133-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
13.2.1
Modem Control Timing
MODEM Control Timing
IOW
(WRITE MCR)
│
│
│
│
→
RTS,DTR
CTS,DSR
DCD
IRQ3 or
IRQ4
│
│
│
│
│
→
│
│
│
→│ ←TRIM
IOR
(READ MSR)
→
← TMWO
│
│
│
│
?
│
│
│
│
→ │← TSIM
│
│
│
│
←TSIM
│
│
│
│
│
│
←TMWO
│
│
│
│
│
│
│
││
│
│
│
│
→ ←TRIM
TSIM
│← →
│
│
│
│
│
│
?
RI
Printer Interrupt Timing
ACK
IRQ7
→
│
│
│
│
│
│
│
│
│
│
│
← TLAD
-134 -
│
│
│
│
│
│
│
│
│
│
│
│
→
│
│
│
│
│
←TLID
W83877TF/W83877TG
13.3 Parallel Port
13.3.1
Parallel Port Timing
IOW
t1
INIT, STROBE
AUTOFD, SLCTIN
PD<0:7>
ACK
t2
IRQ (SPP)
IRQ
(EPP or ECP)
t3
t4
nFAULT
(ECP)
ERROR
(ECP)
t5
t2
t4
IRQ
-135-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
13.3.2
EPP Data or Address Read Cycle (EPP Version 1.9)
t3
A<0:10>
IOR
t1
t2
t6
t4
t7
SD<0:7>
t8
t5
t9
IOCHRDY
t10
t13
t15
t14
WRITE
t16
t18
t19
t20
t17
PD<0:7>
t21
ADDRSTB
t22
t23 t24
t25
DATASTB
t26
t27
WAIT
-136 -
t28
W83877TF/W83877TG
13.3.3
EPP Data or Address Write Cycle (EPP Version 1.9)
t3
t4
A10-A0
SD<0:7>
t1
t5
t2
IOW
IOCHRDY
t
7
t6
t8
t9
t10
t11
WRITE
t12
t13
t14
PD<0:7>
t15
t16
t17
DATAST
ADDRSTB
t18
t19
t20
WAIT
t21
t22
PBDIR
-137-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
13.3.4
EPP Data or Address Read Cycle (EPP Version 1.7)
t3
A<0:10>
IOR
t1
t2
t4
t6
t7
SD<0:7>
t8
t5
t9
IOCHRDY
t10
t13
t15
t14
WRITE
t16
t18
t19
t17
t20
PD<0:7>
t21
ADDRSTB
t22
t23
t25
t24
DATASTB
t26
t27
WAIT
-138 -
t28
W83877TF/W83877TG
13.3.5
EPP Data or Address Write Cycle (EPP Version 1.7)
t3
t4
A10-A0
SD<0:7>
t1
IOW
t7
IOCHRDY
WRITE
t5
t2
t6
t8
t9
t10
t11
t22
t13
t22
PD<0:7>
t15
t16
t17
DATAST
t18
ADDRSTB
t19
t20
WAIT
13.3.6
Parallel Port FIFO Timing
t4
t3
>|
>|
PD<0:7>
t1
nSTROBE
t2
>|
t6
>
t5
>|
>|
BUSY
-139-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
13.3.7
ECP Parallel Port Forward Timing
t3
nAUTOFD
t4
PD<0:7>
t1
t2
t6
t8
nSTROBE
t5
t5
t7
BUSY
13.3.8
ECP Parallel Port Reverse Timing
t2
PD<0:7>
t1
t3
t4
nACK
t5
t6
nAUTOFD
-140 -
t5
W83877TF/W83877TG
14. APPLICATION CIRCUITS
14.1 Parallel Port Extension FDD
JP13
WE2/SLCT
WD2/PE
MOB2/BUSY
DSB2/ACK
PD7
PD6
PD5
DCH2/PD4
RDD2/PD3
STEP2/SLIN
WP2/PD2
DIR2/INIT
TRK02/PD1
HEAD2/ERR
IDX2/PD0
RWC2/AFD
STB
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
JP 13A
DCH2
HEAD2
RDD2
WP2
TRK02
WE2
WD2
STEP2
DIR2
MOB2
DSB2
IDX2
RWC2
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
EXT FDC
PRINTER PORT
Parallel Port Extension FDD Mode Connection Diagram
-141-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
14.2 Parallel Port Extension 2FDD
JP13
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
WE2/SLCT
WD2/PE
MOB2/BUSY
DSB2/ACK
DSA2/PD7
MOA2/PD6
PD5
DCH2/PD4
RDD2/PD3
STEP2/SLIN
WP2/PD2
DIR2/INIT
TRK02/PD1
HEAD2/ERR
IDX2/PD0
RWC2/AFD
STB
JP 13A
DCH2
HEAD2
RDD2
WP2
TRK02
WE2
WD2
STEP2
DIR2
MOB2
DSA2
DSB2
MOA2
IDX2
RWC2
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
EXT FDC
PRINTER PORT
Parallel Port Extension 2FDD Connection Diagram
14.3 Four FDD Mode
W83777F
74LS139
7407(2)
DSA
G1
A1
1Y0
1Y1
DSB
B1
1Y2
1Y3
2Y0
2Y1
2Y2
2Y3
MOA
MOB
G2
A2
B2
-142 -
DSA
DSB
DSC
DSD
MOA
MOB
MOC
MOD
W83877TF/W83877TG
15. ORDERING INFORMATION
PART NO.
PACKAGE
W83877TF
100-pin QFP
W83877TD
100-pin LQFP
W83877TG
100-pin QFP for lead-free
-143-
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
16. HOW TO READ THE TOP MARKING
Example: The top marking of W83877TF
inbond
W83877TF
719AB27039520
1st line: Winbond logo
2nd line: the type number: W83877TF
3rd line: tracking code
719 A B 2 7039530
719: packages made in '97, week 19
A: assembly house ID; A means ASE, S means SPIL....etc
B: IC revision; B means version B, C means version C
2: wafers manufactured in Winbond FAB 2
7039530: wafer production series lot number
inbond
W83877TFG
719AB27039520
1st line: Winbond logo
2nd line: the type number: W83877TG(Lead-free package)
3rd line: tracking code
719 A B 2 7039530
719: packages made in '97, week 19
A: assembly house ID; A means ASE, S means SPIL....etc
B: IC revision; B means version B, C means version C
2: wafers manufactured in Winbond FAB 2
7039530: wafer production series lot number
-144 -
W83877TF/W83877TG
17. PACKAGE DIMENSION
W83877TF (100-pin QFP)
HD
D
100
81
Symbol
1
80
A
A1
A2
b
c
D
E
e
HD
HE
L
L1
y
θ
E HE
51
30
Dimension in inches
Min. Nom. Max.
Dimension in mm
Min. Nom. Max.
0.130
0.004
3.30
0.10
0.107
0.112
0.117
2.73
2.85
2.97
0.010
0.012
0.016
0.25
0.30
0.40
0.004
0.006
0.010
0.10
0.15
0.25
0.546
0.551
0.556
13.87
14.00
14.13
20.13
0.782
0.787
0.792
19.87
20.00
0.020
0.026
0.032
0.50
0.65
0.80
0.728
0.740
0.752
18.49
18.80
19.10
0.964
0.976
0.988
24.49
24.80
25.10
0.039
0.047
0.055
1.00
1.20
1.40
0.087
0.094
0.103
2.21
2.40
2.62
0.004
0
12
0.10
0
12
Notes:
31
e
b
50
1. Dimension D & E do not include interlead
flash.
2. Dimension b does not include dambar
protrusion/intrusion.
3. Controlling dimension: Millimeters
4. General appearance spec. should be based
on final visual inspection spec.
c
A2
Seating Plane
See Detail F
A1
y
A
θ
L
L1
-145-
Detail F
Publication Release Date: May 2006
Revision 0.7
W83877TF/W83877TG
W83877TD (100-pin LQFP)
HD
D
100
81
Symbol
1
80
A
A1
A2
b
c
D
E
e
HD
HE
L
L1
y
θ
E HE
51
30
Dimension in inches
Min. Nom. Max.
Dimension in mm
Min. Nom. Max.
0.002
0.004
0.006
0.05
0.10
0.15
0.053
0.055
0.057
1.35
1.40
1.45
0.009
0.013
0.015
0.22
0.32
0.38
0.004
0.006
0.008
0.10
0.15
0.20
0.547
0.551
0.555
13.90
14.00
14.10
0.783
0.787
0.791
19.90
20.00
20.10
0.020
0.026
0.032
0.498
0.65
0.802
0.626
0.630
0.634
15.90
16.00
16.10
0.862
0.866
0.870
21.90
22.00
22.10
0.018
0.024
0.030
0.45
0.60
0.75
0.039
1.00
0.003
0
7
0.08
0
Notes:
31
e
b
50
1. Dimension D & E do not include interlead
flash.
2. Dimension b does not include dambar
protrusion/intrusion.
3. Controlling dimension: Millimeters
4. General appearance spec. should be based
on final visual inspection spec.
c
A2
Seating Plane
See Detail F
A1
y
A
θ
L
L1
-146 -
Detail F
7
W83877TF/W83877TG
Important Notice
Winbond products are not designed, intended, authorized or warranted for use as components
in systems or equipment intended for surgical implantation, atomic energy control
instruments, airplane or spaceship instruments, transportation instruments, traffic signal
instruments, combustion control instruments, or for other applications intended to support or
sustain life. Further more, Winbond products are not intended for applications wherein failure
of Winbond products could result or lead to a situation wherein personal injury, death or
severe property or environmental damage could occur.
Winbond customers using or selling these products for use in such applications do so at their
own risk and agree to fully indemnify Winbond for any damages resulting from such improper
use or sales.
-147-
Publication Release Date: May 2006
Revision 0.7