ETC LSI53C860

TECHNICAL
MANUAL
LSI53C860
PCI to Ultra SCSI
I/O Processor
Version 2.1
April 2001
®
S14069
This document contains proprietary information of LSI Logic Corporation. The
information contained herein is not to be used by or disclosed to third parties
without the express written permission of an officer of LSI Logic Corporation.
LSI Logic products are not intended for use in life-support appliances, devices,
or systems. Use of any LSI Logic product in such applications without written
consent of the appropriate LSI Logic officer is prohibited.
Document DB14-000171-00, First Edition (April 2001)
This document describes the LSI Logic LSI53C860 PCI to Ultra SCSI I/O
Processor and will remain the official reference source for all revisions/releases
of this product until rescinded by an update.
To receive product literature, visit us at http://www.lsilogic.com.
LSI Logic Corporation reserves the right to make changes to any products herein
at any time without notice. LSI Logic does not assume any responsibility or
liability arising out of the application or use of any product described herein,
except as expressly agreed to in writing by LSI Logic; nor does the purchase or
use of a product from LSI Logic convey a license under any patent rights,
copyrights, trademark rights, or any other of the intellectual property rights of
LSI Logic or third parties.
Copyright © 1995–2001 by LSI Logic Corporation. All rights reserved.
TRADEMARK ACKNOWLEDGMENT
The LSI Logic logo design, TolerANT, SDMS, and SCRIPTS are registered
trademarks or trademarks of LSI Logic Corporation. All other brand and product
names may be trademarks of their respective companies.
ii
Preface
This book is the primary reference and technical manual for the LSI Logic
LSI53C860 PCI to Ultra SCSI I/O Processor. It contains a complete
functional description for the product and includes complete physical and
electrical specifications.
Audience
This technical manual provides reference information on the LSI53C860
PCI to Ultra SCSI I/O Processor. It is intended for system designers and
programmers who are using this device to design a SCSI port for
PCI-based personal computers, workstations, or embedded applications.
Organization
This document has the following chapters and appendix:
•
Chapter 1, General Description, includes general information
about the LSI53C860 and other members of the LSI53C8XX family
of PCI to SCSI I/O Processors.
•
Chapter 2, Functional Description, describes the main functional
areas of the chip in more detail, including the interfaces to the SCSI
bus.
•
Chapter 3, PCI Functional Description, describes the chip’s
connection to the PCI bus, including the PCI commands and
configuration registers supported.
•
Chapter 4, Signal Descriptions, contains the pin diagrams and
definitions of each signal.
•
Chapter 5, Operating Registers, describes each bit in the
operating registers, organized by address.
Preface
iii
•
Chapter 6, Instruction Set of the I/O Processor, defines all of the
SCSI SCRIPTS instructions that are supported by the LSI53C860.
•
Chapter 7, Electrical Characteristics, contains the electrical
characteristics and AC timings for the chip.
•
Appendix A, Register Summary, is a register summary of the
LSI53C860.
Related Publications
For background please contact:
ANSI
11 West 42nd Street
New York, NY 10036
(212) 642-4900
Ask for document number X3.131-199X (SCSI-2)
Global Engineering Documents
15 Inverness Way East
Englewood, CO 80112
(800) 854-7179 or (303) 397-7956 (outside U.S.) FAX (303) 397-2740
Ask for document number X3.131-1994 (SCSI-2) or X3.253
(SCSI-3 Parallel Interface)
ENDL Publications
14426 Black Walnut Court
Saratoga, CA 95070
(408) 867-6642
Document names: SCSI Bench Reference, SCSI Encyclopedia,
SCSI Tutor
Prentice Hall
113 Sylvan Avenue
Englewood Cliffs, NJ 07632
(800) 947-7700
Ask for document number ISBN 0-13-796855-8, SCSI: Understanding
the Small Computer System Interface
LSI Logic World Wide Web Home Page
www.lsil.com
iv
Preface
PCI Special Interest Group
2575 N. E. Katherine
Hillsboro, OR 97214
(800) 433-5177; (503) 693-6232 (International); FAX (503) 693-8344
SCSI SCRIPTS™ Processors Programming Guide, Order Number
S14044.A
Conventions Used in This Manual
The word assert means to drive a signal true or active. The word
deassert means to drive a signal false or inactive.
Hexadecimal numbers are indicated by the prefix “0x” —for example,
0x32CF. Binary numbers are indicated by the prefix “0b” —for example,
0b0011.0010.1100.1111.
Revision Record
Revision
Date
Remarks
1.0
6/95
First version.
2.0
6/96
Revised technical manual.
2.1
4/01
All product names changed from SYM to LSI.
Preface
v
vi
Preface
Contents
Chapter 1
Chapter 2
General Description
1.1
Benefits of Ultra SCSI
1.2
TolerANT® Technology
1.3
LSI53C860 Benefits Summary
1.3.1
SCSI Performance
1.3.2
PCI Performance
1.3.3
Integration
1.3.4
Ease of Use
1.3.5
Flexibility
1.3.6
Reliability
1.3.7
Testability
Functional Description
2.1
SCSI Core
2.1.1
DMA Core
2.2
SCRIPTS Processor
2.2.1
SDMS Software: The Total SCSI Solution
2.2.2
Designing an Ultra SCSI System
2.3
Prefetching SCRIPTS Instructions
2.3.1
Opcode Fetch Burst Capability
2.4
PCI Cache Mode
2.4.1
Load and Store Instructions
2.4.2
3.3 V/5 V PCI Interface
2.4.3
Loopback Mode
2.5
Parity Options
2.5.1
DMA FIFO
2.6
SCSI Bus Interface
2.6.1
Terminator Networks
2.6.2
Select/Reselect During Selection/Reselection
Contents
1-2
1-2
1-3
1-4
1-4
1-5
1-5
1-5
1-6
1-7
2-1
2-2
2-2
2-3
2-3
2-4
2-5
2-5
2-5
2-6
2-6
2-6
2-9
2-11
2-12
2-12
vii
2.7
Chapter 3
Chapter 4
2.6.3
Synchronous Operation
Interrupt Handling
2.7.1
Polling and Hardware Interrupts
PCI Functional Description
3.1
PCI Addressing
3.1.1
Configuration Space
3.1.2
PCI Bus Commands and Functions Supported
3.2
PCI Cache Mode
3.2.1
Support for PCI Cache Line Size Register
3.2.2
Selection of Cache Line Size
3.2.3
Alignment
3.2.4
Memory Read Multiple Command
3.2.5
Unsupported PCI Commands
3.3
Configuration Registers
Signal Descriptions
4.1
PCI Bus Interface Signals
4.1.1
System Signals
4.1.2
Address and Data Signals
4.1.3
Interface Control Signals
4.1.4
Arbitration Signals
4.1.5
Error Reporting Signals
4.2
SCSI Bus Interface Signals
4.2.1
SCSI Bus Interface Signals
4.2.2
Additional Interface Signals
Chapter 5
Operating Registers
Chapter 6
Instruction Set of the I/O Processor
6.1
Low Level Register Interface Mode
6.2
SCSI SCRIPTS
6.2.1
Sample Operation
6.3
Block Move Instructions
6.3.1
First Dword
6.3.2
Second Dword
viii
Contents
2-13
2-15
2-16
3-1
3-1
3-2
3-3
3-3
3-4
3-4
3-7
3-8
3-9
5-5
5-5
5-6
5-7
5-8
5-8
5-9
5-9
5-10
7-1
7-2
7-3
7-5
7-6
7-12
6.4
6.5
6.6
6.7
6.8
Chapter 7
Appendix A
I/O Instructions
6.4.1
First Dword
6.4.2
Second Dword
Read/Write Instructions
6.5.1
First Dword
6.5.2
Second Dword
6.5.3
Read-Modify-Write Cycles
6.5.4
Move To/From SFBR Cycles
Transfer Control Instructions
6.6.1
First Dword
6.6.2
Second Dword
Memory Move Instructions
6.7.1
First Dword
6.7.2
Second Dword
6.7.3
Third Dword
6.7.4
Read/Write System Memory from a SCRIPTS
Instruction
Load and Store Instructions
6.8.1
First Dword
6.8.2
Second Dword
Electrical Characteristics
7.1
DC Characteristics
7.2
TolerANT Technology
7.3
AC Characteristics
7.4
PCI Interface Timing Diagrams
7.4.1
Target Timing
7.4.2
Initiator Timing
7.5
PCI Interface Timing
7.6
SCSI Timing
7.7
Package Drawings
7-13
7-13
7-22
7-22
7-22
7-23
7-23
7-23
7-27
7-27
7-35
7-35
7-38
7-38
7-38
7-39
7-39
7-40
7-41
8-1
8-6
8-10
8-12
8-13
8-17
8-25
8-26
8-30
Register Summary
Index
Contents
ix
Customer Feedback
Figures
1.1
1.2
2.1
2.2
2.3
4.1
4.2
6.1
6.2
6.3
6.4
6.5
6.6
6.7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
7.19
x
LSI53C860 System Diagram
LSI53C860 Chip Diagram
DMA FIFO Sections
LSI53C860 Host Interface Data Paths
Active or Regulated Termination
LSI53C860 Pin Diagram
Functional Signal Grouping
SCRIPTS Overview
Block Move Instruction Register
I/O Instruction Register
Read/Write Register Instruction
Transfer Control Instruction
Memory to Memory Move Instruction
Load and Store Instruction Format
Rise and Fall Time Test Conditions
SCSI Input Filtering
Hysteresis of SCSI Receiver
Input Current as a Function of Input Voltage
Output Current as a Function of Output Voltage
Clock Timing Waveform
Reset Input Waveforms
Interrupt Output Waveforms
PCI Configuration Register Read
PCI Configuration Register Write
Target Read
Target Write
OpCode Fetch, Nonburst
Burst OpCode Fetch
Back-to-Back Read
Back-to-Back Write
Burst Read
Burst Write
Initiator Asynchronous Send
Contents
1-7
1-8
2-9
2-11
2-13
5-2
5-4
7-5
7-8
7-16
7-25
7-30
7-37
7-42
8-8
8-8
8-8
8-9
8-9
8-10
8-11
8-11
8-13
8-14
8-15
8-16
8-17
8-18
8-19
8-20
8-21
8-23
8-26
7.20
7.21
7.22
7.23
7.24
Initiator Asynchronous Receive
Target Asynchronous Send
Target Asynchronous Receive
Initiator and Target Synchronous Transfers
100 LD PQFP (UD) Mechanical Drawing (Sheet 1 of 2)
8-27
8-27
8-28
8-28
8-31
2.1
2.2
2.3
3.1
3.2
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
5.1
5.2
5.3
5.4
Bits Used for Parity Control and Observation
SCSI Parity Control
SCSI Parity Errors and Interrupts
PCI Bus Commands and Encoding Types
PCI Configuration Register Map
Power and Ground Signals
System Signals
Address and Data Signals
Interface Control Signals
Arbitration Signals
Error Reporting Signals
SCSI Bus Interface Signals
Additional Interface Signals
LSI53C860 Register Address Map
Synchronous Clock Conversion Factor
Asynchronous Clock Conversion Factor
Examples of Synchronous Transfer Periods and Rates
for SCSI-1
Examples of Synchronous Transfer Periods and Rates
for Fast SCSI
SCSI Synchronous Offset Values
SCRIPTS Instructions
Read/Write Instructions
Absolute Maximum Stress Ratings
Operating Conditions
SCSI Signals—SD[7:0]/, SDP/, SREQ/, SACK/
SCSI Signals—SMSG, SI_O/, SC_D/, SATN/, SBSY/,
SSEL/, SRST/
Input Signals—CLK, SCLK, GNT/, IDSEL, RST/, TESTIN
Capacitance
Output Signals—MAC/_TESTOUT, REQ/
2-7
2-8
2-8
3-9
3-10
5-3
5-5
5-6
5-7
5-8
5-8
5-9
5-10
6-2
6-11
6-12
Tables
5.5
5.6
6.1
6.2
7.1
7.2
7.3
7.4
7.5
7.6
7.7
Contents
6-14
6-15
6-16
7-3
7-26
8-2
8-2
8-3
8-3
8-3
8-4
8-4
xi
7.8
7.9
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
7.19
7.20
7.21
7.22
7.23
A.1
A.2
xii
Output Signal—IRQ/
Output Signal—SERR/
Bidirectional Signals—AD[31:0], C_BE/[3:0], FRAME/,
IRDY/, TRDY/, DEVSEL/, STOP/, PERR/, PAR/
Bidirectional Signals—GPIO0_FETCH/, GPIO1_MASTER/
TolerANT Technology Electrical Characteristics
Clock Timing
Reset Input
Interrupt Output
PCI Timing
Initiator Asynchronous Send (5 Mbytes/s)
Initiator Asynchronous Receive (5 Mbytes/s)
Target Asynchronous Send (5 Mbytes/s)
Target Asynchronous Receive (5 Mbytes/s)
SCSI-1 Transfers (SE, 5.0 Mbytes/s)
SCSI-2 Fast Transfers (10.0 Mbytes/s (8-Bit Transfers),
40 MHz Clock)
Ultra SCSI Transfers (20.0 Mbytes/s (8-Bit Transfers),
80 MHz Clock)
Configuration Registers
SCSI Registers
Contents
8-4
8-5
8-5
8-6
8-7
8-10
8-11
8-11
8-25
8-26
8-27
8-27
8-28
8-29
8-29
8-30
A-1
A-2
Chapter 1
General Description
Chapter 1 is divided into the following sections:
•
Section 1.1, “Benefits of Ultra SCSI”
•
Section 1.2, “TolerANT® Technology”
•
Section 1.3, “LSI53C860 Benefits Summary”
The LSI53C860 PCI to Ultra SCSI I/O Processor brings
high-performance I/O solutions to host adapter, workstation, and general
computer designs, making it easy to add SCSI to any PCI system.
The LSI53C860 is a pin-for-pin replacement for the LSI53C810 PCI to
SCSI I/O processor. It performs Ultra SCSI transfers or Fast SCSI
transfers in Single-Ended (SE) mode and improves performance by
optimizing PCI bus utilization.
The LSI53C860 integrates a high-performance SCSI core, a PCI bus
master DMA core, and the LSI Logic SCSI SCRIPTS™ processor to
meet the flexibility requirements of SCSI-1, SCSI-2, and Ultra SCSI
standards. It is designed to implement multithreaded I/O algorithms with
a minimum of processor intervention, solving the protocol overhead
problems of previous intelligent and nonintelligent adapter designs.
The LSI53C860 is fully supported by the LSI Logic Storage Device
Management System (SDMS™), a software package that supports the
Advanced SCSI Protocol Interface (ASPI). SDMS software provides
BIOS and driver support for hard disk, tape, removable media products,
and CD-ROM under the major PC operating systems.
The LSI53C860 is packaged in a compact rectangular 100-pin Plastic
Quad Flat Pack (PQFP) package to minimize board space requirements.
It operates the SCSI bus at 5 Mbytes/s asynchronously or up to
20 Mbytes/s synchronously and bursts data to the host at full PCI
LSI53C860 PCI to Ultra SCSI I/O Processor
1-1
speeds. The LSI53C860 increases SCRIPTS performance and reduces
PCI bus overhead by allowing instruction prefetches of four or eight
Dwords.
Software development tools are available to developers who use the
SCSI SCRIPTS language to create customized SCSI software
applications. The LSI53C860 allows easy firmware upgrades and is
supported by advanced SCRIPTS commands.
1.1 Benefits of Ultra SCSI
Ultra SCSI is an extension of the SCSI-3 standard that expands the
bandwidth of the SCSI bus and allows faster synchronous SCSI transfer
rates. When enabled, Ultra SCSI performs 20 megatransfers during an
I/O operation, resulting in approximately twice the synchronous transfer
rates of fast SCSI-2. The LSI53C860 can perform 8-bit, Ultra SCSI
synchronous transfers as fast as 20 Mbytes/s. This advantage is most
noticeable in heavily loaded systems or with applications with large block
requirements, such as video on-demand and image processing.
An advantage of Ultra SCSI is that it significantly improves SCSI
bandwidth while preserving existing hardware and software investments.
The primary software changes required enable the chip to perform
synchronous negotiations for Ultra SCSI rates. The LSI53C860 uses the
same board socket as an LSI53C810, with the addition of an 80 MHz
SCLK. Some changes to existing cabling or system designs may be
needed to maintain signal integrity at Ultra SCSI synchronous transfer
rates. These design issues are discussed in Chapter 2, “Functional
Description.”
1.2 TolerANT® Technology
The LSI53C860 features TolerANT technology, which includes active
negation on the SCSI drivers and input signal filtering on the SCSI
receivers. Active negation actively drives the SCSI Request,
Acknowledge, Data, and Parity signals HIGH rather than allowing them
to be passively pulled up by terminators. Active negation is enabled by
setting bit 7 in the SCSI Test Three (STEST3) register.
1-2
General Description
TolerANT receiver technology improves data integrity in unreliable
cabling environments where other devices would be subject to data
corruption. TolerANT receivers filter the SCSI bus signals to eliminate
unwanted transitions, without the long signal delay associated with
RC-type input filters. This improved driver and receiver technology helps
eliminate double clocking of data, the single biggest reliability issue with
SCSI operations. TolerANT input signal filtering is a built in feature of all
LSI Logic fast SCSI devices. On the LSI53C8XX family products, the
user may select a filtering period of 30 or 60 ns, with bit 1 in the SCSI
Test Two (STEST2) register. During Ultra SCSI transfers, the filtering
period is automatically set at 15 ns. This period cannot be extended with
the Extend SREQ/SACK Filtering bit.
The benefits of TolerANT technology include increased immunity to noise
when the signal is going HIGH, better performance due to balanced duty
cycles, and improved fast SCSI transfer rates. In addition, TolerANT SCSI
devices do not cause glitches on the SCSI bus at power-up or
power-down, so other devices on the bus are also protected from data
corruption. TolerANT technology is compatible with both the Alternative
One and Alternative Two termination schemes proposed by the American
National Standards Institute.
1.3 LSI53C860 Benefits Summary
This section provides an overview of the LSI53C860 features and
benefits. It contains these topics:
•
SCSI Performance
•
PCI Performance
•
Integration
•
Ease of Use
•
Flexibility
•
Reliability
•
Testability
LSI53C860 Benefits Summary
1-3
1.3.1 SCSI Performance
To improve SCSI performance, the LSI53C860:
•
Complies with PCI 2.1 specification
•
Performs Ultra SCSI synchronous transfers as fast as 20 Mbytes/s
•
Supports variable block size and scatter/gather data transfers
•
Minimizes SCSI I/O start latency
•
Performs complex bus sequences without interrupts, including
restore data pointers
•
Reduces ISR overhead through a unique interrupt status reporting
method
•
Performs fast SCSI bus transfers in SE mode
–
up to 7 Mbytes/s asynchronous
–
10 Mbytes/s synchronous, or 20 Mbytes/s synchronous with Ultra
SCSI
•
Increases performance of data transfers to and from the chip
registers with new Load and Store SCRIPTS instruction
•
Supports target disconnect and later reselect with no interrupt to the
system processor
•
Supports execution of multithreaded I/O algorithms in SCSI
SCRIPTS with fast I/O context switching
1.3.2 PCI Performance
To improve PCI performance, the LSI53C860:
1-4
•
Bursts 2, 4, 8, or 16 Dwords across PCI bus with 80-byte DMA FIFO
•
Prefetches up to 8 Dwords of SCRIPTS instructions
•
Supports 32-bit word data bursts with variable burst lengths
•
Bursts SCRIPTS opcode fetches across the PCI bus
•
Performs zero wait-state bus master data bursts faster than
110 Mbytes/s (@ 33 MHz)
•
Supports PCI Cache Line Size register
General Description
1.3.3 Integration
Features of the LSI53C860 which ease integration include:
•
3.3 V/5 V PCI interface
•
Full 32-bit PCI DMA bus master
•
DMA controller using Memory-to-Memory Move instructions
•
High-performance SCSI core
•
Integrated SCRIPTS processor
•
Compact 100-pin PQFP packaging
1.3.4 Ease of Use
The LSI53C860 provides:
•
Direct PCI-to-SCSI connection
•
Reduced SCSI development effort
•
Support for the ASPI software standard using SDMS software
•
Compatibility with existing LSI53C7XX and LSI53C8XX family
SCRIPTS
•
Direct connection to PCI and SCSI SE bus
•
Development tools and sample SCSI SCRIPTS
•
Maskable and pollable interrupts
•
Three programmable SCSI timers: Select/Reselect, Handshake-toHandshake, and General Purpose. The time-out period is
programmable from 100 µs to greater than 1.6 seconds
•
SDMS software for complete PC-based operating system support
•
Support for relative jumps
•
SCSI Selected As ID bits for responding with multiple IDs
1.3.5 Flexibility
The LSI53C860 provides:
•
High level programming interface (SCSI SCRIPTS)
LSI53C860 Benefits Summary
1-5
•
Support for execution of tailored SCSI sequences from main system
RAM
•
Flexible programming interface to tune I/O performance or to adapt
to unique SCSI devices
•
Flexibility to accommodate changes in the logical I/O interface
definition
•
Low level access to all registers and all SCSI bus signals
•
Fetch, Master, and Memory Access control pins
•
Support for indirect fetching of DMA address and byte counts so that
SCRIPTS can be placed in a PROM
•
Separate SCSI and system clocks
•
Selectable IRQ pin disable bit
•
Ability to route system clock to SCSI clock
1.3.6 Reliability
Enhanced reliability features of the LSI53C860 include:
1-6
•
2 kV ESD protection on SCSI signals
•
Typical 300 mV SCSI bus hysteresis
•
Average operating supply current of 50 mA
•
Protection against bus reflections due to impedance mismatches
•
Controlled bus assertion times (reduces RFI, improves reliability, and
eases FCC certification)
•
Latch-up protection greater than 150 mA
•
Voltage feed-through protection (minimum leakage current through
SCSI pads)
•
High proportion (> 25%) of device pins are power and ground
•
Power and ground isolation of I/O pads and internal chip logic
•
TolerANT technology, which provides:
–
Active negation of SCSI Data, Parity, Request, and Acknowledge
signals for improved fast SCSI transfer rates.
–
Input signal filtering on SCSI receivers improves data integrity,
even in noisy cabling environments.
General Description
1.3.7 Testability
The LSI53C860 provides improved testability through:
•
Access to all SCSI signals through programmed I/O
•
SCSI loopback diagnostics
•
SCSI bus signal continuity checking
•
Support for single step mode operation
•
Test mode (AND tree) to check pin continuity to the board
A system diagram showing the connections of the LSI53C860 in a PCI
system is pictured in Figure 1.1. A block diagram of the LSI53C860 is
pictured in Figure 1.2.
Figure 1.1
LSI53C860 System Diagram
SCSI Connection
SCSI Term Connection
SCSI Bus
PCI Bus
LSI53C860
Peripheral
80 MHz Oscillator
Bulkhead
CPU Baseboard
CPU Box
LSI53C860 Benefits Summary
1-7
Figure 1.2
LSI53C860 Chip Diagram
PCI
PCI Master and Slave Control Block
Data FIFO
80 Bytes
SCSI
Scripts
Operating
Registers
Config
Registers
SCSI FIFO and SCSI Control Block
TolerANT Technology Drivers and Receivers
SE SCSI Bud
1-8
General Description
Chapter 2
Functional Description
Chapter 2 is divided into the following sections:
•
Section 2.1, “SCSI Core”
•
Section 2.2, “SCRIPTS Processor”
•
Section 2.3, “Prefetching SCRIPTS Instructions”
•
Section 2.4, “PCI Cache Mode”
•
Section 2.5, “Parity Options”
•
Section 2.6, “SCSI Bus Interface”
•
Section 2.7, “Interrupt Handling”
The LSI53C860 contains three functional blocks: the SCSI Core, the
DMA Core, and the SCRIPTS Processor. The LSI53C860 is fully
supported by SDMS software, a complete software package that
supports the LSI Logic product line of SCSI processors and controllers.
2.1 SCSI Core
The SCSI core supports Ultra SCSI synchronous transfer rates up to
20 Mbytes/s, Fast SCSI synchronous transfer rates up to 10 Mbytes/s,
and asynchronous transfer rates up to 7 Mbytes/s on an 8-bit SCSI bus.
The SCSI core can be programmed with SCSI SCRIPTS, making it easy
to fine tune the system for specific mass storage devices or advanced
SCSI requirements.
The SCSI core offers low-level register access or a high-level control
interface. Like first generation SCSI devices, the LSI53C860 is accessed
as a register-oriented device. Error recovery and/or diagnostic
LSI53C860 PCI to Ultra SCSI I/O Processor
2-1
procedures use the ability to sample and/or assert any signal on the
SCSI bus. In support of loopback diagnostics, the SCSI core may
perform a self-selection and operate as both an initiator and a target.
The LSI53C860 is controlled by the integrated SCRIPTS processor
through a high-level logical interface. Commands controlling the SCSI
core are fetched out of the main host memory or local memory. These
commands instruct the SCSI core to Select, Reselect, Disconnect, Wait
for a Disconnect, Transfer Information, Change Bus Phases and, in
general, implement all aspects of the SCSI protocol. The SCRIPTS
processor is a special high-speed processor optimized for SCSI protocol.
2.1.1 DMA Core
The DMA core is a bus master DMA device that attaches directly to the
industry standard PCI bus. The DMA core is tightly coupled to the SCSI
core through the SCRIPTS processor, which supports uninterrupted
scatter/gather memory operations.
The LSI53C860 supports 32-bit memory and automatically supports
misaligned DMA transfers. An 80-byte FIFO allows two, four, eight, or
sixteen Dword bursts across the PCI bus interface to run efficiently
without throttling the bus during PCI bus latency.
2.2 SCRIPTS Processor
The SCSI SCRIPTS processor allows both DMA and SCSI commands
to be fetched from host memory. Algorithms written in SCSI SCRIPTS
control the actions of the SCSI and DMA cores. The SCRIPTS processor
executes complex SCSI bus sequences independently of the host CPU.
The SCRIPTS processor can begin a SCSI I/O operation in
approximately 500 ns. This compares with 2–8 ms required for traditional
intelligent host adapters. Algorithms may be designed to tune SCSI bus
performance, to adjust to new bus device types (such as scanners,
communication gateways, etc.), or to incorporate changes in the SCSI-2
or SCSI-3 logical bus definitions without sacrificing I/O performance.
SCSI SCRIPTS are hardware independent, so they can be used
interchangeably on any host or CPU system bus.
2-2
Functional Description
A complete set of development tools is available for writing custom
drivers with SCSI SCRIPTS. For more information on SCSI SCRIPTS
instructions supported by the LSI53C860, see Chapter 6, “Instruction Set
of the I/O Processor.”
2.2.1 SDMS Software: The Total SCSI Solution
For users who do not need to develop custom drivers, LSI Logic provides
a total SCSI solution in PC environments with SDMS software.
SDMS software provides BIOS and driver support for hard disk, tape,
and removable media peripherals for the major PC-based operating
systems.
SDMS software includes a SCSI BIOS to manage all SCSI functions
related to the device. It also provides a series of SCSI device drivers that
support most major operating systems. SDMS software supports a
multithreaded I/O application programming interface (API) for
user-developed SCSI applications. SDMS software supports both the
ASPI and CAM SCSI software specifications.
2.2.2 Designing an Ultra SCSI System
Migrating an existing SE SCSI design from Fast SCSI to Ultra SCSI
requires minor software modifications as well as consideration for some
hardware design guidelines. Since Ultra SCSI is based on existing SCSI
standards, it can use existing software programs as long as the software
is able to negotiate for Ultra SCSI synchronous transfer rates.
In the area of hardware, the primary area of concern in SE systems is
to maintain signal integrity at high data transfer rates. To assure reliable
operation at Ultra SCSI transfer speeds, follow the system design
parameters recommended in the SCSI-3 Ultra SCSI Parallel Interface
draft standard. Chapter 7, “Electrical Characteristics,” contains Ultra
SCSI timing information. In addition to the guidelines in the draft
standard, make the following hardware and software adjustments to
accommodate Ultra SCSI transfers:
•
Set the Ultra SCSI Enable bit to enable Ultra SCSI transfers.
•
Set the TolerANT Enable bit, bit 7 in the SCSI Test Three (STEST3)
register, whenever the Fast-20 Enable bit is set.
SCRIPTS Processor
2-3
•
Do not extend the SREQ/SACK filtering period with SCSI Test Two
(STEST2), bit 1.
•
Use an 80 MHz SCLK.
2.3 Prefetching SCRIPTS Instructions
When enabled by setting the Prefetch Enable bit in the DMA Control
(DCNTL) register, the prefetch logic in the LSI53C860 fetches 4 or
8 Dwords of instructions. The prefetch logic automatically determines the
maximum burst size that it can perform, based on the burst length as
determined by the values in the DMA Mode (DMODE) register and the
PCI Cache Line Size register (if cache mode is enabled). If the unit
cannot perform bursts of at least four Dwords, it disables itself.
The LSI53C860 may flush the contents of the prefetch unit under certain
conditions, listed below, to ensure that the chip always operates from the
most current version of the software. When one of these conditions apply,
the contents of the prefetch unit are automatically flushed.
2-4
•
On every Memory Move instruction. The Memory Move (MMOV)
instruction is often used to place modified code directly into memory.
To make sure that the chip executes all recent modifications, the
prefetch unit flushes its contents and loads the modified code every
time a MMOV instruction is issued. To avoid inadvertently flushing
the prefetch unit contents, use the No Flush Memory to Memory
Move (NFMMOV) instruction for all MMOV operations that do not
modify code within the next 4 to 8 Dwords. For more information on
this instruction, refer to Chapter 6, “Instruction Set of the I/O
Processor.”
•
On every Store instruction. The Store instruction may also be used
to place modified code directly into memory. To avoid inadvertently
flushing the prefetch unit contents use the No Flush option for all
Store operations that do not modify code within the next 8 Dwords.
•
On every write to the DMA SCRIPTS Pointer (DSP) register.
•
On all Transfer Control instructions when the transfer conditions are
met. This is necessary because the next instruction to execute is not
the sequential next instruction in the prefetch unit.
Functional Description
•
When the Prefetch Flush bit (DMA Control (DCNTL) register, bit 5)
is set. The unit flushes whenever this bit is set. The bit is
self-clearing.
2.3.1 Opcode Fetch Burst Capability
Setting the Burst Opcode Fetch Enable bit (bit 1) in the DMA Mode
(DMODE) register (0x38) causes the LSI53C860 to burst in the first two
Dwords of all instruction fetches. If the instruction is a Memory-toMemory Move, the third Dword is accessed in a separate ownership. If
the instruction is an indirect type, the additional Dword is accessed in a
subsequent bus ownership. If the instruction is a Table Indirect Block
Move, the chip uses two accesses to obtain the four Dwords required, in
two bursts of two Dwords each.
Note:
This feature is only useful if SCRIPTS prefetching is
disabled.
2.4 PCI Cache Mode
The LSI53C860 supports the PCI specification for an 8-bit Cache Line
Size register located in PCI configuration space. The Cache Line Size
register provides the ability to sense and react to nonaligned addresses
corresponding to cache line boundaries. In conjunction with the Cache
Line Size register, the PCI commands Read Line, Read Multiple, and
Write and Invalidate are each software enabled or disabled to allow the
user full flexibility in using these commands. For more information on PCI
cache mode operations, refer to Chapter 3, “PCI Functional Description.”
2.4.1 Load and Store Instructions
The LSI53C860 supports the Load and Store instruction type, which
simplifies the movement of data between memory and the internal chip
registers. It also enables the chip to transfer bytes to addresses relative
to the Data Structure Address (DSA) register. For more information on
the Load and Store instructions, refer to Chapter 6, “Instruction Set of the
I/O Processor.”
PCI Cache Mode
2-5
2.4.2 3.3 V/5 V PCI Interface
The LSI53C860 can attach directly to a 3.3. V or a 5 V PCI interface,
due to separate VDD pins for the PCI bus drivers. This allows the devices
to be used on the universal board recommended by the PCI Special
Interest Group.
2.4.3 Loopback Mode
The LSI53C860 loopback mode allows testing of both initiator and target
functions and, in effect, lets the chip communicate with itself. When the
Loopback Enable bit is set in the SCSI Test One (STEST1) register, the
LSI53C860 allows control of all SCSI signals whether the chip is
operating in the initiator or target mode. For more information on this
mode of operation, refer to the SCSI SCRIPTS Processors Programming
Guide.
2.5 Parity Options
The LSI53C860 implements a flexible parity scheme that allows control
of the parity sense, allows parity checking to be turned on or off, and has
the ability to deliberately send a byte with bad parity over the SCSI bus
to test parity error recovery procedures. Table 2.1 defines the bits that
are involved in parity control and observation. Table 2.2 describes the
parity control function of the Enable Parity Checking and Assert SCSI
Even Parity bits in the SCSI Control Zero (SCNTL0) register. Table 2.3
describes the options available when a parity error occurs.
2-6
Functional Description
Table 2.1
Bits Used for Parity Control and Observation
BIt Name
Location
Description
Assert SATN/ on Parity
Errors
SCSI Control
Zero (SCNTL0),
Bit 1
Causes the LSI53C860 to automatically assert SATN/
when it detects a parity error while operating as an
initiator.
Enable Parity
Checking
SCSI Control
Zero (SCNTL0),
Bit 3
Enables the LSI53C860 to check for parity errors. The
LSI53C860 checks for odd parity.
Assert Even SCSI Parity SCSI Control
One (SCNTL1),
Bit 2
Determines the SCSI parity sense generated by the
LSI53C860 to the SCSI bus.
Disable Halt on SATN/
or a Parity Error (Target
Mode Only)
SCSI Control
One (SCNTL1),
Bit 5
Causes the LSI53C860 not to halt operations when a
SCSI parity error is detected in target mode.
Enable Parity Error
Interrupt
SCSI Interrupt
Enable Zero
(SIEN0), Bit 0
Determines whether the LSI53C860 generates an
interrupt when it detects a SCSI parity error.
Parity Error
SCSI Interrupt
Status Zero
(SIST0), Bit 0
This status bit is set whenever the LSI53C860 detects
a parity error on the SCSI bus.
Status of SCSI
Parity Signal
SCSI Status Zero
(SSTAT0), Bit 0
This status bit represents the live SCSI Parity Signal
(SDP).
Latched SCSI Parity
SCSI Status One
(SSTAT1), Bit 3
This bit reflects the SCSI odd parity signal
corresponding to the data latched into the SCSI Input
Data Latch (SIDL) register.
Master Parity Error
Enable
Chip Test Four
(CTEST4), Bit 3
Enables parity checking during PCI master data
phases.
Master Data Parity Error DMA Status
(DSTAT), Bit 6
Set when the LSI53C860, as a PCI master, detects a
target device signaling a parity error during a data
phase.
Master Data Parity Error
Interrupt Enable
By clearing this bit, a Master Data Parity Error does
not cause assertion of IRQ/, but the status bit is set in
the DMA Status (DSTAT) register.
DMA Interrupt
Enable (DIEN),
Bit 6
Parity Options
2-7
Table 2.2
SCSI Parity Control
EPC
AESP
Description
0
0
Does not check for parity errors. Parity is generated
when sending SCSI data. Asserts odd parity when
sending SCSI data.
0
1
Does not check for parity errors. Parity is generated
when sending SCSI data. Asserts even parity when
sending SCSI data.
1
0
Checks for odd parity on SCSI data received. Parity is
generated when sending SCSI data. Asserts odd
parity when sending SCSI data.
1
1
Checks for odd parity on SCSI data received. Parity is
generated when sending SCSI data. Asserts even
parity when sending SCSI data.
1. EPC = Enable Parity Checking (bit 3 SCSI Control Zero (SCNTL0)).
2. ASEP = Assert SCSI Even Parity (bit 2 SCSI Control One (SCNTL1)).
Table 2.3
SCSI Parity Errors and Interrupts
DHP
PAR
Description
0
0
Halts when a parity error occurs in the target or
initiator mode and does NOT generate an interrupt.
0
1
Halts when a parity error occurs in target mode and
generates an interrupt in target or initiator mode.
1
0
Does not halt in target mode when a parity error
occurs until the end of the transfer. An interrupt is not
generated.
1
1
Does not halt in target mode when a parity error
occurs until the end of the transfer. An interrupt is
generated.
1. DHP = Disable Halt on SATN/ or Parity Error (bit 5 SCSI Control One (SCNTL1)).
2. PAR = Parity Error (bit 0 SCSI Interrupt Enable Zero (SIEN0)).
Note: This table only applies when the Enable Parity Checking bit is set.
2-8
Functional Description
2.5.1 DMA FIFO
The DMA FIFO is divided into four sections, each one byte wide and
20 transfers deep. The DMA FIFO is illustrated in Figure 2.1.
Figure 2.1
DMA FIFO Sections
32 Bits Wide
20 Bytes
Deep
8 Bits
Byte Lane 3
8 Bits
Byte Lane 2
8 bits
Byte Lane 1
8 Bits
Byte Lane 0
2.5.1.1 Data Paths
The data path through the LSI53C860 is dependent on whether data is
being moved into or out of the chip, and whether SCSI data is being
transferred asynchronously or synchronously.
Figure 2.2 shows how data is moved to/from the SCSI bus in each of the
different modes.
The following steps determine if any bytes remain in the data path when
the chip halts an operation:
Asynchronous SCSI Send –
Step 1. Look at the DMA FIFO (DFIFO) and DMA Byte Counter (DBC)
registers and calculate if there are bytes left in the DMA FIFO.
To make this calculation, subtract the seven least significant bits
Parity Options
2-9
of the DMA Byte Counter (DBC) register from the 7-bit value of
the DMA FIFO (DFIFO) register. AND the result with 0x7F for
a byte count between zero and 80.
Step 2. Read bit 5 in the SCSI Status Zero (SSTAT0) register to
determine if any bytes are left in the SCSI Output Data Latch
(SODL) register. If bit 5 is set in the SSTAT0 register, then the
SCSI Output Data Latch (SODL) register is full.
Synchronous SCSI Send –
Step 1. Look at the DMA FIFO (DFIFO) and DMA Byte Counter (DBC)
registers and calculate if there are bytes left in the DMA FIFO.
To make this calculation, subtract the seven least significant bits
of the DMA Byte Counter (DBC) register from the 7-bit value of
the DMA FIFO (DFIFO) register. AND the result with 0x7F for
a byte count between zero and 80.
Step 2. Read bit 5 in the SCSI Status Zero (SSTAT0) register to
determine if any bytes are left in the SCSI Output Data Latch
(SODL) register. If bit 5 is set in the SSTAT0 register, then the
SCSI Output Data Latch (SODL) register is full.
Step 3. Read bit 6 in the SCSI Status Zero (SSTAT0) register to
determine if any bytes are left in the SODR register. If bit 6 is
set in the SSTAT0 register, then the SODR register is full.
Asynchronous SCSI Receive –
Step 1. Look at the DMA FIFO (DFIFO) and DMA Byte Counter (DBC)
registers and calculate if there are bytes left in the DMA FIFO.
To make this calculation, subtract the seven least significant bits
of the DMA Byte Counter (DBC) register from the 7-bit value of
the DMA FIFO (DFIFO) register. AND the result with 0x7F for
a byte count between zero and 80.
Step 2. Read bit 7 in the SCSI Status Zero (SSTAT0) register to
determine if any bytes are left in the SCSI Input Data Latch
(SIDL) register. If bit 7 is set in the SSTAT0 register, then the
SCSI Input Data Latch (SIDL) register is full.
2-10
Functional Description
Synchronous SCSI Receive –
Step 1. Subtract the seven least significant bits of the DMA Byte
Counter (DBC) register from the 7-bit value of the DMA FIFO
(DFIFO) register. AND the result with 0x7F for a byte count
between 0 and 80.
Step 2. Read the SCSI Status One (SSTAT1) register and examine
bits [7:4], the binary representation of the number of valid bytes
in the SCSI FIFO, to determine if any bytes are left in the SCSI
FIFO.
Figure 2.2
LSI53C860 Host Interface Data Paths
PCI Interface
PCI Interface
PCI Interface
PCI Interface
DMA FIFO
(4 Bytes x 20)
DMA FIFO
(4 Bytes x 20)
DMA FIFO
(4 Bytes x 20)
DMA FIFO
(4 Bytes x 20)
SODL Register
SIDL Register
SODL Register
SCSI FIFO
SCSI Interface
SCSI Interface
SODR Register
SCSI Interface
SCSI Interface
Asynchronous
SCSI Send
Asynchronous
SCSI Receive
Synchronous
SCSI Send
Synchronous
SCSI Receive
2.6 SCSI Bus Interface
The LSI53C860 supports SE operation only. All SCSI signals are active
LOW. The LSI53C860 contains the SE output drivers and can be
connected directly to the SCSI bus. Each output is isolated from the
power supply to ensure that a powered-down LSI53C860 has no effect
on an active SCSI bus (CMOS “voltage feed-through” phenomena).
TolerANT technology provides signal filtering at the inputs of SREQ/ and
SACK/ to increase immunity to signal reflections.
SCSI Bus Interface
2-11
2.6.1 Terminator Networks
The terminator networks provide the biasing needed to pull signals to an
inactive voltage level, and to match the impedance seen at the end of
the cable with the characteristic impedance of the cable. Terminators
must be installed at the extreme ends of the SCSI chain, and only at the
ends. No system should ever have more or less than two terminators
installed and active. SCSI host adapters should provide a means of
accommodating terminators. There should be a means of disabling the
termination.
SE cables can use a 220 Ω pull-up to the terminator power supply
(Term Power) line and a 330 Ω pull-down resistor to ground. Because of
the high-performance nature of the LSI53C860, regulated (or active)
termination is recommended. Figure 2.3 shows a Unitrode active
terminator. For additional information, refer to the SCSI-2 Specification.
TolerANT technology active negation can be used with any
ANSI-approved termination network.
Note:
Active termination is required in Ultra SCSI systems.
2.6.2 Select/Reselect During Selection/Reselection
In multithreaded SCSI I/O environments, it is not uncommon to be
selected or reselected while trying to perform selection/reselection. This
situation may occur when a SCSI controller (operating in the initiator
mode) tries to select a target and is reselected by another. The Select
SCRIPTS instruction has an alternate address to which the SCRIPTS will
jump when this situation occurs. The analogous situation for target
devices is being selected while trying to perform a reselection.
Once a change in operating mode occurs, the initiator SCRIPTS should
start with a Set Initiator instruction or the target SCRIPTS should start
with a Set Target instruction. The Selection and Reselection Enable bits
(SCSI Chip ID (SCID) bits 5 and 6, respectively) should both be asserted
so that the LSI53C860 may respond as an initiator or as a target. If only
selection is enabled, the LSI53C860 cannot be reselected as an initiator.
There are also status and interrupt bits in the SCSI Interrupt Status Zero
(SIST0) and SCSI Interrupt Enable Zero (SIEN0) registers, respectively,
indicating that the LSI53C860 has been selected (bit 5) or reselected
(bit 4).
2-12
Functional Description
Figure 2.3
Active or Regulated Termination
UC5601QP
TERML1
TERML2
REG_OUT
TERML3
TERML4
TERML5
TERML6
TERML7
TERML8
TERML9
2.85 V
DISCONNECT
TERML10
TERML11
TERML12
TERML13
TERML14
TERML15
TERML16
TERML17
TERML18
20
21
22
23
24
25
26
27
28
SD0 (J1.2)
SD1 (J1.4)
SD2 (J1.6)
SD3 (J1.8)
SD4 (J1.10)
SD5 (J1.12)
SD6 (J1.14)
SD7 (J1.16)
SD8 (J1.18)
3
4
5
6
7
8
9
10
11
ATN (J1.32)
BSY (J1.36)
ACK (J1.38)
RST (J1.40)
MSG (J1.42)
SEL (J1.44)
C/D (J1.46)
REQ (J1.48)
I/O (J1.50)
Key
C1
10 µF SMT
C2
0.1 µF SMT
J1
68-pin, high density “P” connector
2.6.3 Synchronous Operation
The LSI53C860 can transfer synchronous SCSI data in both the initiator
and target modes. The SCSI Transfer (SXFER) register controls both the
synchronous offset and the transfer period. It may be loaded by the CPU
before SCRIPTS execution begins, from within SCRIPTS using a Table
Indirect I/O instruction, or with a Read-Modify-Write instruction.
The LSI53C860 can receive data from the SCSI bus at a synchronous
transfer period as short as 50 ns, regardless of the transfer period used
to send data. The LSI53C860 can receive data at one-fourth of the
SCSI Bus Interface
2-13
divided SCLK frequency. Depending on the SCLK frequency, the
negotiated transfer period, and the synchronous clock divider, the
LSI53C860 can send synchronous data at intervals as short as 50 ns for
Ultra SCSI, 100 ns for fast SCSI-2, and 200 ns for SCSI-1.
2.6.3.1 Determining the Data Transfer Rate
Synchronous data transfer rates are controlled by bits in two different
registers of the LSI53C860. Following is a brief description of the bits.
2.6.3.2 SCSI Control Three (SCNTL3) Register, Bits [6:4] (SCF[2:0])
The SCF[2:0] bits select the factor by which the frequency of SCLK is
divided before being presented to the synchronous SCSI control logic.
The output from this divider controls the rate at which data can be
received; this rate must not exceed 80 MHz. The receive rate is
one-fourth of the divider output. For example, if SCLK is 40 MHz and the
SCF value is set to divide by one, then the maximum rate at which data
can be received is 10 Mbytes/s (40/(1*4) = 10).
For synchronous send, the output of the SCF divider is divided by the
transfer period (XFERP) bits in the SCSI Transfer (SXFER) register. For
valid combinations of the SCF and the XFERP, see Table 5.4 and
Table 5.5, under the description of the XFERP bits [7:5] in the SCSI
Transfer (SXFER) register.
2.6.3.3 SCSI Control Three (SCNTL3) Register, Bits [2:0] (CCF[2:0])
The CCF[2:0] bits select the frequency of the SCLK for asynchronous
SCSI operations. To meet the SCSI timings as defined by the ANSI
specification, these bits need to be set properly.
2.6.3.4 SCSI Transfer (SXFER) Register, Bits [7:5] (TP[2:0])
The TP[2:0] divider (XFERP) bits determine the SCSI synchronous send
rate in either initiator or target mode. This value further divides the output
from the SCF divider.
2-14
Functional Description
2.6.3.5 Achieving Optimal SCSI Send Rates
To achieve optimal synchronous SCSI send timings, the SCF divisor
value should be set high, to divide the clock as much as possible before
presenting the clock to the TP divider bits in the SCSI Transfer (SXFER)
register. The TP[2:0] divider value should be as low as possible. For
example, with an 80 MHz clock to achieve a 10 Mbytes/s send rate, the
SCF bits can be set to divide by 1 and the TP bits to divide by 8; or the
SCF bits can be set to divide by 2 and the TP bits set to divide by 4.
Use the second option to achieve optimal SCSI timings.
2.6.3.6 Ultra SCSI Synchronous Data Transfers
Ultra SCSI is an extension of the current fast SCSI synchronous transfer
specifications. It allows synchronous transfer periods to be negotiated
down as low as 50 ns, which is half the 100 ns period allowed under fast
SCSI. This will allow a maximum transfer rate of 20 Mbytes/s on an 8-bit
SCSI bus. The LSI53C860 requires an 80 MHz SCSI clock input to
perform Ultra SCSI transfers. In addition, the following bit values affect
the chip’s ability to support Ultra SCSI synchronous transfer rates:
•
Clock Conversion Factor bits, SCSI Control Three (SCNTL3) register
bits [2:0] and Synchronous Clock Conversion Factor bits, SCSI
Control Three (SCNTL3) register bits [6:4]. These fields support the
value of 101b which sets the CCF to work with 80 MHz and the SCF
to be divided by 4 to run Ultra SCSI rates.
•
Ultra Enable bit, SCSI Control Three (SCNTL3) register, bit 7. Setting
this bit enables Ultra SCSI synchronous transfers in systems that
have an 80 MHz clock.
•
Tolerant Enable bit SCSI Test Three (STEST3), bit 7. Active negation
must be enabled for Ultra SCSI operation.
2.7 Interrupt Handling
The SCRIPTS processor in the LSI53C860 performs most functions
independently of the host microprocessor. However, certain interrupt
situations must be handled by the external microprocessor. This section
explains all aspects of interrupts as they apply to the LSI53C860.
Interrupt Handling
2-15
2.7.1 Polling and Hardware Interrupts
The external microprocessor is informed of an interrupt condition by
polling or hardware interrupts. Polling means that the microprocessor
must continually loop and read a register until it detects a bit set that
indicates an interrupt. This method is the fastest, but it wastes CPU time
that could be used for other system tasks. The preferred method of
detecting interrupts in most systems is hardware interrupts. In this case,
the LSI53C860 asserts the Interrupt Request (IRQ/) line that interrupts
the microprocessor, causing the microprocessor to execute an interrupt
service routine. A hybrid approach would use hardware interrupts for
long waits, and use polling for short waits.
2.7.1.1 Registers
The registers in the LSI53C860 that are used for detecting or defining
interrupts are the Interrupt Status (ISTAT), SCSI Interrupt Status Zero
(SIST0), SCSI Interrupt Status One (SIST1), DMA Status (DSTAT), SCSI
Interrupt Enable Zero (SIEN0), SCSI Interrupt Enable One (SIEN1), DMA
Control (DCNTL), and DMA Interrupt Enable (DIEN).
ISTAT – The Interrupt Status (ISTAT) is the only register that can be
accessed as a slave during SCRIPTS operation. Therefore it is the
register that is polled when polled interrupts are used. It is also the first
register that should be read when the IRQ/ pin is asserted in association
with a hardware interrupt. The INTF (Interrupt-on-the-Fly) bit should be
the first interrupt serviced. It must be written to one to be cleared. This
interrupt must be cleared before servicing any other interrupts.
If the SIP bit in the Interrupt Status (ISTAT) register is set, then a
SCSI-type interrupt has occurred and the SCSI Interrupt Status Zero
(SIST0) and SCSI Interrupt Status One (SIST1) registers should be read.
If the DIP bit in the Interrupt Status (ISTAT) register is set, then a
DMA-type interrupt has occurred and the DMA Status (DSTAT) register
should be read.
SCSI-type and DMA-type interrupts may occur simultaneously, so in
some cases both SIP and DIP may be set.
2-16
Functional Description
SIST0 and SIST1 – The SCSI Interrupt Status Zero (SIST0) and SCSI
Interrupt Status One (SIST1) registers contain SCSI-type interrupt bits.
Reading these registers determines which condition or conditions caused
the SCSI-type interrupt, and clears that SCSI interrupt condition.
If the LSI53C860 is receiving data from the SCSI bus and a fatal interrupt
condition occurs, the chip attempts to send the contents of the DMA
FIFO to memory before generating the interrupt.
If the LSI53C860 is sending data to the SCSI bus and a fatal SCSI
interrupt condition occurs, data could be left in the DMA FIFO. Because
of this the DMA FIFO Empty (DFE) bit in DMA Status (DSTAT) should be
checked.
If this bit is cleared, set the CLF (Clear DMA FIFO) and CSF (Clear SCSI
FIFO) bits before continuing. The CLF bit is bit 2 in Chip Test Three
(CTEST3). The CSF bit is bit 1 in SCSI Test Three (STEST3).
DSTAT – The DMA Status (DSTAT) register contains the DMA-type
interrupt bits. Reading this register determines which condition or
conditions caused the DMA-type interrupt, and clears that DMA interrupt
condition. The DFE bit, bit 7 in DMA Status (DSTAT), is purely a status
bit. It will not generate an interrupt under any circumstances and will not
be cleared when read. DMA interrupts flush neither the DMA nor SCSI
FIFOs before generating the interrupt, so the DFE bit in the DMA Status
(DSTAT) register should be checked after any DMA interrupt.
If the DFE bit is cleared, then the FIFOs must be cleared by setting the
CLF (Clear DMA FIFO) and CSF (Clear SCSI FIFO) bits, or flushed by
setting the FLF (Flush DMA FIFO) bit.
SIEN0 and SIEN1 – The SCSI Interrupt Enable Zero (SIEN0) and SCSI
Interrupt Enable One (SIEN1) registers are the interrupt enable registers
for the SCSI interrupts in SCSI Interrupt Status Zero (SIST0) and SCSI
Interrupt Status One (SIST1).
DIEN – The DMA Interrupt Enable (DIEN) register is the interrupt enable
register for DMA interrupts in DMA Status (DSTAT).
DCNTL – When bit 1 in DMA Control (DCNTL) is set, the IRQ/ pin is not
asserted when an interrupt condition occurs. The interrupt is not lost or
ignored, but merely masked at the pin. Clearing this bit when an interrupt
Interrupt Handling
2-17
is pending immediately causes the IRQ/ pin to assert. As with any
register other than Interrupt Status (ISTAT), this register cannot be
accessed except by a SCRIPTS instruction during SCRIPTS execution.
2.7.1.2 Fatal vs. Nonfatal Interrupts
A fatal interrupt, as the name implies, always causes the SCRIPTS to
stop running. All nonfatal interrupts become fatal when they are enabled
by setting the appropriate interrupt enable bit. Interrupt masking is
discussed in Section 2.7.1.3, “Masking.” All DMA interrupts (indicated by
the DIP bit in Interrupt Status (ISTAT) and one or more bits in DMA
Status (DSTAT) being set) are fatal.
Some SCSI interrupts (indicated by the SIP bit in the Interrupt Status
(ISTAT) and one or more bits in SCSI Interrupt Status Zero (SIST0) or
SCSI Interrupt Status One (SIST1) being set) are nonfatal.
When the LSI53C860 is operating in the Initiator mode, only the Function
Complete (CMP), Selected (SEL), Reselected (RSL), General Purpose
Timer Expired (GEN), and Handshake-to-Handshake Timer Expired
(HTH) interrupts are nonfatal.
When operating in the target mode, CMP, SEL, RSL, Target mode: SATN/
active (M/A), GEN, and HTH are nonfatal. Refer to the description for the
Disable Halt on a Parity Error or SATN/ active (Target Mode Only) (DHP)
bit in the SCSI Control One (SCNTL1) register to configure the chip’s
behavior when the SATN/ interrupt is enabled during Target mode
operation. The Interrupt-on-the-Fly interrupt is also nonfatal, since
SCRIPTS can continue when it occurs.
The reason for nonfatal interrupts is to prevent SCRIPTS from stopping
when an interrupt occurs that does not require service from the CPU.
This prevents an interrupt when arbitration is complete (CMP set), when
the LSI53C860 has been selected or reselected (SEL or RSL set), when
the initiator asserts ATN (target mode: SATN/ active), or when the
General Purpose or Handshake-to-Handshake timers expire. These
interrupts are not needed for events that occur during high-level
SCRIPTS operation.
2-18
Functional Description
2.7.1.3 Masking
Masking an interrupt means disabling or ignoring that interrupt. Interrupts
can be masked by clearing bits in the SCSI Interrupt Enable Zero
(SIEN0) and SCSI Interrupt Enable One (SIEN1) (for SCSI interrupts)
registers or the DMA Interrupt Enable (DIEN) (for DMA interrupts)
register. How the chip responds to masked interrupts depends on:
whether polling or hardware interrupts are being used; whether the
interrupt is fatal or nonfatal; and whether the chip is operating in the
Initiator or Target mode.
If a nonfatal interrupt is masked and that condition occurs, the SCRIPTS
do not stop, the appropriate bit in the SCSI Interrupt Status Zero (SIST0)
or SCSI Interrupt Status One (SIST1) is still set, the SIP bit in the
Interrupt Status (ISTAT) is not set, and the IRQ/ pin is not asserted. See
Section 2.7.1.2, “Fatal vs. Nonfatal Interrupts,” for a list of the nonfatal
interrupts.
If a fatal interrupt is masked and that condition occurs, then the
SCRIPTS still stop, the appropriate bit in the DMA Status (DSTAT), SCSI
Interrupt Status Zero (SIST0), or SCSI Interrupt Status One (SIST1)
register is set, and the SIP or DIP bits in the Interrupt Status (ISTAT)
register is set, but the IRQ/ pin is not asserted.
When the chip is initialized, enable all fatal interrupts if you are using
hardware interrupts. If a fatal interrupt is disabled and that interrupt
condition occurs, the SCRIPTS halt and the system never knows it
unless it times out and checks the Interrupt Status (ISTAT) register after
a certain period of inactivity.
If you are polling the Interrupt Status (ISTAT) instead of using hardware
interrupts, then masking a fatal interrupt makes no difference since the
SIP and DIP bits in the Interrupt Status (ISTAT) inform the system of
interrupts, not the IRQ/ pin.
Masking an interrupt after IRQ/ is asserted does not cause deassertion
of IRQ/.
2.7.1.4 Stacked Interrupts
The LSI53C860 will stack interrupts if they occur one after the other. If
the SIP or DIP bits in the Interrupt Status (ISTAT) register are set (first
level), then there is already at least one pending interrupt, and any future
Interrupt Handling
2-19
interrupts are stacked in extra registers behind the SCSI Interrupt Status
Zero (SIST0), SCSI Interrupt Status One (SIST1), and DMA Status
(DSTAT) registers (second level). When two interrupts have occurred and
the two levels of the stack are full, any further interrupts set additional
bits in the extra registers behind SCSI Interrupt Status Zero (SIST0),
SCSI Interrupt Status One (SIST1), and DMA Status (DSTAT). When the
first level of interrupts are cleared, all the interrupts that came in
afterward move into the SCSI Interrupt Status Zero (SIST0), SCSI
Interrupt Status One (SIST1), and DMA Status (DSTAT). After the first
interrupt is cleared by reading the appropriate register, the IRQ/ pin is
deasserted for a minimum of three CLKs; the stacked interrupts move
into the SCSI Interrupt Status Zero (SIST0), SCSI Interrupt Status One
(SIST1), or DMA Status (DSTAT); and the IRQ/ pin is asserted once
again.
Since a masked nonfatal interrupt does not set the SIP or DIP bits,
interrupt stacking does not occur. A masked, nonfatal interrupt still posts
the interrupt in SCSI Interrupt Status Zero (SIST0), but does not assert
the IRQ/ pin. Since no interrupt is generated, future interrupts move right
into the SCSI Interrupt Status Zero (SIST0) or SCSI Interrupt Status One
(SIST1) instead of being stacked behind another interrupt. When another
condition occurs that generates an interrupt, the bit corresponding to the
earlier masked nonfatal interrupt is still set.
A related situation to interrupt stacking is when two interrupts occur
simultaneously. Since stacking does not occur until the SIP or DIP bits
are set, there is a small timing window in which multiple interrupts can
occur but are not stacked. These could be multiple SCSI interrupts (SIP
set), multiple DMA interrupts (DIP set), or multiple SCSI and multiple
DMA interrupts (both SIP and DIP set).
As previously mentioned, DMA interrupts do not attempt to flush the
FIFOs before generating the interrupt. It is important to set the Clear
DMA FIFO (CLF) and Clear SCSI FIFO (CSF) bits if a DMA interrupt
occurs and the DMA FIFO Empty (DFE) bit is not set. This is because
any future SCSI interrupts are not posted until the DMA FIFO is cleared
of data. These ‘locked out’ SCSI interrupts are posted as soon as the
DMA FIFO is empty.
2-20
Functional Description
2.7.1.5 Halting in an Orderly Fashion
When an interrupt occurs, the LSI53C860 attempts to halt in an orderly
fashion.
•
If the interrupt occurs in the middle of an instruction fetch, the fetch
is completed, except in the case of a Bus Fault. Execution does not
begin, but the DMA SCRIPTS Pointer (DSP) points to the next
instruction since it is updated when the current instruction is fetched.
•
If the DMA direction is a write to memory and a SCSI interrupt
occurs, the LSI53C860 attempts to flush the DMA FIFO to memory
before halting. Under any other circumstances only the current cycle
is completed before halting, so the DFE bit in DMA Status (DSTAT)
register should be checked to see if any data remains in the DMA
FIFO.
•
SCSI SREQ/SACK handshakes that have begun are completed
before halting.
•
The LSI53C860 attempts to clean up any outstanding synchronous
offset before halting.
•
In the case of Transfer Control Instructions, once instruction
execution begins it continues to completion before halting.
•
If the instruction is a JUMP/CALL WHEN/IF <phase>, the DMA
SCRIPTS Pointer (DSP) is updated to the transfer address before
halting.
•
All other instructions may halt before completion.
2.7.1.6 Sample Interrupt Service Routine
The following is a sample of an interrupt service routine for the
LSI53C860. It can be repeated during polling or should be called when
the IRQ/ pin is asserted if hardware interrupts.
1. Read Interrupt Status (ISTAT).
2. If the INTF bit is set, it must be written to a one to clear this status.
3. If only the SIP bit is set, read SCSI Interrupt Status Zero (SIST0) and
SCSI Interrupt Status One (SIST1) to clear the SCSI interrupt
condition and get the SCSI interrupt status. The bits in the SCSI
Interrupt Handling
2-21
Interrupt Status Zero (SIST0) and SCSI Interrupt Status One (SIST1)
tell which SCSI interrupts occurred and determine what action is
required to service the interrupts.
4. If only the DIP bit is set, read the DMA Status (DSTAT) to clear the
interrupt condition and get the DMA interrupt status. The bits in the
DMA Status (DSTAT) tells which DMA interrupts occurred and
determine what action is required to service the interrupts.
5. If both the SIP and DIP bits are set, read SCSI Interrupt Status Zero
(SIST0), SCSI Interrupt Status One (SIST1), and DMA Status
(DSTAT) to clear the SCSI and DMA interrupt condition and get the
interrupt status. If using 8-bit reads of the SCSI Interrupt Status Zero
(SIST0), SCSI Interrupt Status One (SIST1), and DMA Status
(DSTAT) registers to clear interrupts, insert a 12 CLK delay between
the consecutive reads to ensure that the interrupts clear properly.
Both the SCSI and DMA interrupt conditions should be handled
before leaving the ISR. It is recommended that the DMA interrupt is
serviced before the SCSI interrupt, because a serious DMA interrupt
condition could influence how the SCSI interrupt is acted upon.
6. When using polled interrupts, go back to Step 1 before leaving the
interrupt service routine, in case any stacked interrupts moved in
when the first interrupt was cleared. When using hardware interrupts,
the IRQ/ pin is asserted again if there are any stacked interrupts.
This should cause the system to re-enter the interrupt service
routine.
2-22
Functional Description
Chapter 3
PCI Functional
Description
Chapter 3 is divided into the following sections:
•
Section 3.1, “PCI Addressing”
•
Section 3.2, “PCI Cache Mode”
•
Section 3.3, “Configuration Registers”
3.1 PCI Addressing
There are three types of PCI-defined address space:
•
Configuration space
•
Memory space
•
I/O space
3.1.1 Configuration Space
The configuration space is a contiguous 256-byte set of addresses
dedicated to each “slot” or “stub” on the bus. Decoding C_BE/[3:0]
determines if a PCI cycle is intended to access configuration register
space. The IDSEL bus signal is a chip select that allows access to the
configuration register space only. A configuration read/write cycle without
IDSEL is ignored. The eight lower order address lines and byte enables
select a specific 8-bit register. The host processor uses this configuration
space to initialize the LSI53C860.
The lower 128 bytes of the LSI53C860 configuration space hold system
parameters while the upper 128 bytes map into the LSI53C860 operating
registers. For all PCI cycles except configuration cycles, the LSI53C860
registers are located on the 256-byte block boundary defined by the base
LSI53C860 PCI to Ultra SCSI I/O Processor
3-1
address assigned through the configured register. The LSI53C860
operating registers are available in both the upper and lower 128-byte
portions of the 256-byte space selected.
At initialization time, each PCI device is assigned a base address (in the
case of the LSI53C860, the upper 24 bits of the address are used) for
memory accesses and I/O accesses. On every access, the LSI53C860
compares its assigned base addresses with the value on the
Address/Data bus during the PCI address phase. If there is a match of
the upper 24 bits, the access is for the LSI53C860 and the low order
eight bits define the register to be accessed. A decode of C_BE/[3:0]
determines which registers and what type of access is to be performed.
PCI defines memory space as a contiguous 32-bit memory address that
is shared by all system resources, including the LSI53C860. Base
Address One (Memory) determines which 256-byte memory area this
device will occupy.
PCI defines I/O space as a contiguous 32-bit I/O address that is shared
by all system resources, including the LSI53C860. Base Address Zero
(I/O) determines which 256-byte I/O area this device will occupy.
3.1.2 PCI Bus Commands and Functions Supported
Bus commands indicate to the target the type of transaction the master
is requesting. Bus commands are encoded on the C_BE/[3:0] lines
during the address phase. PCI bus command encoding and types appear
in Table 3.1.
3.1.2.1 I/O Read Command
The I/O Read command reads data from an agent mapped in I/O
address space. All 32 address bits are decoded.
3.1.2.2 I/O Write Command
The I/O Write command writes data to an agent when mapped in I/O
address space. All 32 address bits are decoded.
3-2
PCI Functional Description
3.1.2.3 Memory Read Command
The Memory Read command reads data from an agent mapped in
memory address space. All 32 address bits are decoded.
3.1.2.4 Memory Read Multiple Command
The Memory Read Multiple command reads data from an agent mapped
in memory address space. All 32 address bits are decoded.
3.1.2.5 Memory Read Line Command
The Memory Read Line command reads data from an agent mapped in
memory address space. All 32 address bits are decoded.
3.1.2.6 Memory Write Command
The Memory Write command writes data to an agent when mapped in
memory address space. All 32 address bits are decoded.
3.1.2.7 Memory Write and Invalidate Command
The Memory Write and Invalidate command writes data to an agent
when mapped in memory address space. All 32 address bits are
decoded.
3.2 PCI Cache Mode
The LSI53C860 supports the PCI specification for an 8-bit Cache Line
Size register located in PCI configuration space. The Cache Line Size
register provides the ability to sense and react to nonaligned addresses
corresponding to cache line boundaries. In conjunction with the Cache
Line Size register, the PCI commands Read Line, Read Multiple, and
Write and Invalidate are each software enabled or disabled to allow the
user full flexibility in using these commands.
3.2.1 Support for PCI Cache Line Size Register
The LSI53C860 supports the PCI specification for an 8-bit Cache Line
Size register in PCI configuration space. It can sense and react to
nonaligned addresses corresponding to cache line boundaries.
PCI Cache Mode
3-3
3.2.2 Selection of Cache Line Size
The cache logic will select a cache line size based on the values for the
burst size in the DMA Mode (DMODE) register and the PCI Cache Line
Size register.
Note:
The LSI53C860 will not automatically use the value in the
PCI Cache Line Size register as the cache line size value.
The chip scales the value of the Cache Line Size register
down to the nearest binary burst size allowed by the chip
(2, 4, 8 or 16), compares this value to the DMA Mode
(DMODE) burst size, then selects the smallest as the value
for the cache line size. The LSI53C860 will use this value
for all burst data transfers.
3.2.3 Alignment
The LSI53C860 uses the calculated burst size value to monitor the
current address for alignment to the cache line size. When it is not
aligned the chip disables bursting, allowing only single Dword transfers
until a cache line boundary is reached. When the chip is aligned, bursting
is re-enabled. It will burst in increments specified by the Cache Line Size
register as explained above. If the Cache Line Size register is not set
(default = 0x00), the DMA Mode (DMODE) burst size is automatically
used as the cache line size.
3.2.3.1 MMOV Misalignment
The LSI53C860 will not operate in a cache alignment mode when a
MMOV instruction is issued and the read and write addresses are
different distances from the nearest cache line boundary. For example, if
the read address is 0x21F and the write address is 0x42F, and the cache
line size is eight (8), the addresses are byte aligned, but they are not the
same distance from the nearest cache boundary. The read address is
1 byte from the cache boundary 0x220 and the write address is 17 bytes
from the cache boundary 0x440. In this situation, the chip will not align
to cache boundaries and will operate as an LSI53C810.
3-4
PCI Functional Description
3.2.3.2 Memory Write and Invalidate Command
The Memory Write and Invalidate command is identical to the Memory
Write command, except that it additionally guarantees a minimum
transfer of one complete cache line; in other words, the master intends
to write all bytes within the addressed cache line in a single PCI
transaction unless interrupted by the target. This command requires
implementation of the PCI Cache Line Size register at address 0x0C in
PCI configuration space. The LSI53C860 enables Memory Write and
Invalidate cycles when bit 0 in the Chip Test Three (CTEST3) register
(WRIE) and bit 4 in the PCI Command register are set. This will cause
Memory Write and Invalidate commands to be issued when the following
conditions are met:
•
The CLSE bit, WRIE bit, and PCI Configuration Command register,
bit 4 must be set.
•
The Cache Line Size register must contain a legal burst size (2, 4, 8
or 16) value AND that value must be less than or equal to the DMA
Mode (DMODE) burst size.
•
The chip must have enough bytes in the DMA FIFO to complete at
least one full cache line burst.
•
The chip must be aligned to a cache line boundary.
When these conditions have been met, the LSI53C860 will issue a Write
and Invalidate command instead of a Memory Write command during all
PCI write cycles.
Multiple Cache Transfers – When multiple cache lines of data have
been read in during a MMOV instruction (see the description for the
Read Multiple command), the LSI53C860 will issue a Write and
Invalidate command using the burst size necessary to transfer all the
data in one transfer. For example, if the cache line size is 4, and the chip
read in 16 Dwords of data using a Read Multiple command, the chip will
switch the burst size to 16, and issue a Write and Invalidate to transfer
all 16 Dwords in one bus ownership.
Latency – In accordance with the PCI specification, the chip's latency
timer will be ignored when issuing a Write and Invalidate command such
that when a latency time-out has occurred, the LSI53C860 will continue
to transfer up until a cache line boundary. At that point, the chip will
PCI Cache Mode
3-5
relinquish the bus, and finish the transfer at a later time using another
bus ownership. If the chip is transferring multiple cache lines it will
continue to transfer until the next cache boundary is reached.
PCI Target Retry – During a Write and Invalidate transfer, if the target
device issues a retry (STOP with no TRDY, indicating that no data was
transferred), the LSI53C860 will relinquish the bus and immediately try
to finish the transfer on another bus ownership. The chip will issue
another Write and Invalidate command on the next ownership, in
accordance with the PCI specification.
PCI Target Disconnect – During a Write and Invalidate transfer, if the
target device issues a disconnect the LSI53C860 will relinquish the bus
and immediately try to finish the transfer on another bus ownership. The
chip will not issue another Write and Invalidate command on the next
ownership.
3.2.3.3 Memory Read Line Command
This command is identical to the Memory Read command, except that it
additionally indicates that the master intends to fetch a complete cache
line. This command is intended to be used with bulk sequential data
transfers where the memory system and the requesting master might
gain some performance advantage by reading up to a cache line
boundary rather than a single memory cycle. The Read Line Mode
function that exists in the previous LSI53C8XX chips has been modified
in the LSI53C860 to reflect the PCI Cache Line Size register
specifications. The functionality of the Enable Read Line bit (bit 3 in DMA
Mode (DMODE)) has been modified to more resemble the Write and
Invalidate mode in terms of conditions that must be met before a Read
Line command will be issued. However, the Read Line option will operate
exactly like the previous LSI53C8XX chips when cache mode has been
disabled by a CLSE bit reset or when certain conditions exist in the chip
(explained below).
The Read Line mode is enabled by setting bit 3 in the DMA Mode
(DMODE) register. If cache mode is disabled, Read Line commands will
be issued on every read data transfer, except opcode fetches, as in
previous LSI53C8XX chips.
3-6
PCI Functional Description
If cache mode has been enabled, a Read Line command will be issued
on all read cycles, except opcode fetches, when the following conditions
have been met:
•
The CLSE and Enable Read Line bits must be set.
•
The Cache Line Size register must contain a legal burst size value
(2, 4, 8 or 16) AND that value must be less than or equal to the
DMODE burst size.
•
The number of bytes to be transferred at the time a cache boundary
has been reached must be equal to or greater than a full cache line
size.
•
The chip must be aligned to a cache line boundary.
When these conditions have been met, the chip will issue a Read Line
command instead of a Memory Read during all PCI read cycles.
Otherwise, it will issue a normal Memory Read command.
3.2.4 Memory Read Multiple Command
This command is identical to the Memory read command except that it
additionally indicates that the master may intend to fetch more than one
cache line before disconnecting. The LSI53C860 supports PCI Read
Multiple functionality and will issue Read Multiple commands on the PCI
bus when the Read Multiple Mode is enabled. This mode is enabled by
setting bit 2 of the DMA Mode (DMODE) register (ERMP). The command
will be issued when certain conditions have been met.
If cache mode has been enabled, a Read Multiple command will be
issued on all read cycles, except opcode fetches, when the following
conditions have been met:
1. The CLSE and ERMP bits must be set.
2. The Cache Line Size register must contain a legal burst size value
(2, 4, 8 or 16) AND that value must be less than or equal to the
DMODE burst size.
3. The number of bytes to be transferred at the time a cache boundary
has been reached must be equal to or greater than the DMA Mode
(DMODE) burst size.
4. The chip must be aligned to a cache line boundary.
PCI Cache Mode
3-7
When these conditions have been met, the chip will issue a Read
Multiple command instead of a Memory Read during all PCI read cycles.
Burst Size Selection – The Read Multiple command reads in multiple
cache lines of data in a single bus ownership. The number of cache lines
to be read is determined by the DMA Mode (DMODE) burst size bits. In
other words, the chip will switch its normal operating burst size to reflect
the DMA Mode (DMODE) burst size settings for the Read Multiple
command. For example, if the cache line size is 4, and the DMA Mode
(DMODE) burst size is 16, the chip will switch the current burst size from
4 to 16, and issue a Read Multiple. After the transfer, the chip will then
switch the burst size back to the normal operating burst size of 4.
Read Multiple with Read Line Enabled – When both the Read
Multiple and Read Line modes have been enabled, the Read Line
command will not be issued if the above conditions are met. Instead, a
Read Multiple command will be issued, even though the conditions for
Read Line have been met.
If the Read Multiple mode is enabled and the Read Line mode has been
disabled, Read Multiple commands will still be issued if the Read Multiple
conditions are met.
3.2.5 Unsupported PCI Commands
The LSI53C860 does not respond to reserved commands, special cycle,
dual address cycle, or interrupt acknowledge commands as a slave. It
will never generate these commands as a master.
The PCI bus commands and encoding types appear in Table 3.1.
3-8
PCI Functional Description
Table 3.1
PCI Bus Commands and Encoding Types
C_BE[3:0]
Command Type
Supported as Master
Supported as Slave
0000
Interrupt Acknowledge
No
No
0001
Special Cycle
No
No
0010
I/O Read Cycle
Yes
Yes
0011
I/O Write Cycle
Yes
Yes
0100
Reserved
N/A
N/A
0101
Reserved
N/A
N/A
0110
Memory Read
Yes
Yes
0111
Memory Write
Yes
Yes
1000
Reserved
N/A
N/A
1001
Reserved
N/A
N/A
1010
Configuration Read
No
Yes
1011
Configuration Write
No
Yes
1100
Memory Read Multiple
Yes
No (defaults to 0110)
1101
Dual Address Cycle
No
No
1110
Memory Read Line
Yes
No (defaults to 0110)
1111
Memory Write and Invalidate
Yes
No (defaults to 0111)
3.3 Configuration Registers
The Configuration registers are accessible only by system BIOS during
PCI configuration cycles, and are not available to the user at any time.
No other cycles, including SCRIPTS operations, can access these
registers.
The lower 128 bytes hold configuration data while the upper 128 bytes
hold the LSI53C860 operating registers, which are described in
Chapter 5, “Operating Registers.” The operating registers can be
accessed by SCRIPTS or the host processor.
Configuration Registers
3-9
Note:
The configuration register descriptions are provided for
general information only, to indicate which PCI
configuration addresses are supported in the LSI53C860.
For detailed information, refer to the PCI Specification.
All PCI-compliant devices, such as the LSI53C860, must support the
Vendor ID, Device ID, Command, and Status registers. Support of other
PCI-compliant registers is optional. In the LSI53C860, registers that are
not supported are not writable and return all zeros when read. Only those
registers and bits that are currently supported by the LSI53C860 are
described in this chapter. For more detailed information on PCI registers,
please see the PCI Specification.
Table 3.2 shows the PCI configuration registers implemented by the
LSI53C860. Addresses 0x40 through 0x7F are not defined.
Table 3.2
PCI Configuration Register Map
31
16 15
0
Device ID
Vendor ID
Status
Command
Class Code
Not Supported
Header Type
Latency Timer
Base Address One
0x04
Revision ID
0x08
Cache Line Size
0x0C
(I/O)1
0x10
(Memory)2
0x14
Base Address Zero
Max_Lat
0x00
Not Supported
0x18
Not Supported
0x1C
Not Supported
0x20
Not Supported
0x24
Reserved
0x28
Reserved
0x2C
Reserved
0x30
Reserved
0x34
Reserved
0x38
Min_Gnt
Interrupt Pin
Interrupt Line
0x3C
1. I/O Base is supported.
2. Memory Base is supported.
Note: Addresses 0x40 to 0x7F are not defined. All unsupported registers are not writable and return
all zeros when read. Reserved registers also return zeros when read.
3-10
PCI Functional Description
Register: 0x00
Vendor ID
Read Only
15
0
VID
1
1
1
1
VID
0
0
0
0
0
0
0
0
0
0
0
0
Vendor ID
[15:0]
This field identifies the manufacturer of the device. The
Vendor ID is 0x1000.
Register: 0x02
Device ID
Read Only
15
0
DID
0
0
0
0
DID
0
0
0
0
0
0
0
0
0
0
0
0
Device ID
[15:0]
This field identifies the particular device. The LSI53C860
device ID is 0x0006.
Register: 0x04
Command
Read/Write
15
9
R
0
0
0
0
0
0
0
8
7
6
5
4
3
2
1
0
SE
R
EPER
R
WIE
R
EBM
EMS
EIS
0
0
0
0
0
0
0
0
0
The Command register provides coarse control over a device’s ability to
generate and respond to PCI cycles. When a zero is written to this
register, the LSI53C860 is logically disconnected from the PCI bus for all
accesses except configuration accesses.
In the LSI53C860, bits 3, 5, 7, and 9 are not implemented. Bits 10
through 15 are reserved.
Configuration Registers
3-11
3-12
R
Reserved
SE
SERR/ Enable
8
This bit enables the SERR/ driver. SERR/ is disabled
when this bit is clear. The default value of this bit is zero.
This bit and bit 6 must be set to report address parity
errors.
EPER
Enable Parity Error Response
6
This bit allows the LSI53C860 to detect parity errors on
the PCI bus and report these errors to the system. Only
data parity checking is enabled. The LSI53C860 always
generates parity for the PCI bus.
WIE
Write and Invalidate Mode
4
This bit, when set, will cause Memory Write and
Invalidate cycles to be issued on the PCI bus after certain
conditions have been met. For more information on these
conditions, refer to the section Section 3.2.3.2, “Memory
Write and Invalidate Command.” To enable Write and
Invalidate Mode, bit 0 in the Chip Test Three (CTEST3)
register (Operating registers) must also be set.
EBM
Enable Bus Mastering
2
This bit controls the LSI53C860’s ability to act as a
master on the PCI bus. A value of zero disables the
device from generating PCI bus master accesses. A
value of one allows the LSI53C860 to behave as a bus
master. The LSI53C860 must be a bus master in order to
fetch SCRIPTS instructions and transfer data.
EMS
Enable Memory Space
1
This bit controls the LSI53C860’s response to memory
space accesses. A value of zero disables the device
response. A value of one allows the LSI53C860 to
respond to memory space accesses at the address
specified by Base Address One (Memory).
EIS
Enable I/O Space
0
This bit controls the LSI53C860’s response to I/O space
accesses. A value of zero disables the response. A value
of one allows the LSI53C860 to respond to I/O space
accesses at the address specified in Base Address Zero
(I/O).
PCI Functional Description
[15:10]
Register: 0x06
Status
Read/Write
15
14
13
12
DPE SSE RMA RTA
0
0
0
0
11
10
9
R
DT[1:0]
0
0
0
8
7
0
DPR
0
R
0
0
0
0
0
0
0
0
The Status register is used to record status information for PCI bus
related events.
In the LSI53C860, bits 0 through 4 are reserved and bits 5, 6, 7, and 11
are not implemented by the LSI53C860.
Reads to this register behave normally. Writes are slightly different in that
bits can be reset, but not set. A bit is reset whenever the register is
written, and the data in the corresponding bit location is a one. For
instance, to clear bit 15 and not affect any other bits, write the value
0x8000 to the register.
DPE
Detected Parity Error (from Slave)
16
This bit will be set by the LSI53C860 whenever it detects
a data parity error, even if parity error handling is
disabled.
SSE
Signaled System Error
14
This bit is set whenever a device asserts the SERR/
signal.
RMA
Master Abort (from Master)
13
This bit should be set by a master device whenever its
transaction (except for Special Cycle) is terminated with
master-abort. All master devices should implement this
bit.
RTA
Received Target Abort (from Master)
12
This bit should be set by a master device whenever its
transaction is terminated with a target abort. All master
devices should implement this bit.
DT[1:0]
DEVSEL/ Timing
These bits encode the timing of DEVSEL/.
Configuration Registers
[10:9]
3-13
0b00
Fast
0b01
Medium
0b10
Slow
0b11
Reserved
These bits are read only and should indicate the slowest
time that a device asserts DEVSEL/ for any bus
command except Configuration Read and Configuration
Write. The LSI53C860 supports 0b01.
DPR
Data Parity Reported
8
This bit is set when the following three conditions are
met:
• the bus agent asserted PERR/ itself or observed
PERR/ asserted;
• the agent setting this bit acted as the bus master for
the operation in which the error occurred; and
• the Parity Error Response bit in the Command
register is set.
R
Reserved
[7:0]
Register: 0x08
Revision ID
Read Only
7
0
RID
LSI53C810A
0
0
1
0
0
1
1
0
0
0
1
0
1
0
0
LSI53C810
0
RID
3-14
Revision ID
[7:0]
This register specifies device and revision identifiers. In
the LSI53C860, the upper nibble is 0000b. The lower
nibble represents the current revision level of the device.
It should have the same value as the Chip Revision Level
bits in the Chip Test Three (CTEST3) register.
PCI Functional Description
Register: 0x09
Class Code
Read Only
23
0
CC
0
0
0
0
1
1
1
1
0
CC
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Class Code
[23:0]
This register is used to identify the generic function of the
device. The upper byte of this register is a base class
code, the middle byte is a subclass code, and the lower
byte identifies a specific register-level programming
interface. The value of this register is 0x010000, which
indicates a SCSI controller.
Register: 0x0C
Cache Line Size
Read/Write
7
0
CLS
0
CLS
0
0
0
0
0
0
0
Cache Line Size
[7:0]
This register specifies the system cache line size in units
of 32-bit words. Cache mode is enabled and disabled by
the Cache Line Size Enable (CLSE) bit, bit 7 in the DMA
Control (DCNTL) register. Setting this bit causes the
LSI53C860 to align to cache line boundaries before
allowing any bursting, except during MMOVs in which the
read and write addresses are Burst Size boundary
misaligned. For more information see
Section 3.2.1, “Support for PCI Cache Line Size Register.”
Configuration Registers
3-15
Register: 0x0D
Latency Timer
Read/Write
7
0
LT
0
0
LT
0
0
0
0
0
0
Latency Timer
[7:0]
The Latency Timer register specifies, in units of PCI bus
clocks, the value of the Latency Timer for this PCI bus
master. The LSI53C860 supports this timer. All eight bits
are writable, allowing latency values of 0–255 PCI clocks.
Use the following equation to calculate an optimum
latency value for the LSI53C860:
Latency = 2 + (Burst Size * (typical wait states +1)).
Values greater than optimum are also acceptable.
Register: 0x0E
Header Type
Read Only
7
0
HT
0
HT
3-16
0
0
0
0
0
0
0
Header Type
[7:0]
This register identifies the layout of bytes 0x10 through
0x3F in configuration space and also whether or not the
device contains multiple functions. The value of this
register is 0x00.
PCI Functional Description
Register: 0x10
Base Address Zero (I/O)
Read/Write
31
0
BARZ
x
x
x
x
x
x
x
x
x
x
x
x
BARZ
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
1
Base Address Register Zero (I/O)
[31:0]
This 32-bit register has bit zero hardwired to one. Bit 1 is
reserved and must return a zero on all reads, and the
other bits are used to map the device into I/O space.
Register: 0x14
Base Address One (Memory)
Read/Write
31
0
BARO
x
x
x
x
x
x
x
x
x
x
x
x
BARO
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
0
Base Address Register One
[31:0]
This register has bit 0 hardwired to zero. For detailed
information on the operation of this register, refer to the
PCI Specification.
Register: 0x3C
Interrupt Line
Read/Write
7
0
IL
0
IL
0
0
0
0
0
0
0
Interrupt Line
[7:0]
This register is used to communicate interrupt line routing
information. POST software will write the routing
information into this register as it initiates and configures
the system. The value in this register tells which input of
Configuration Registers
3-17
the system interrupt controller(s) has been connected to
the device’s interrupt pin. Values in this register are
specified by system architecture.
Register: 0x3D
Interrupt Pin
Read Only
7
0
IP
0
0
IP
0
0
0
0
0
1
Interrupt Pin
[7:0]
This register tells which interrupt pin the device uses. Its
value is set to 0x01, for the INTA/ signal.
Register: 0x3E
Min_Gnt
Read Only
7
0
MG
0
MG
3-18
0
0
1
0
0
0
1
Min_Gnt
[7:0]
This register is used to specify the desired settings for
Latency Timer values. Min_Gnt is used to specify how
long a burst period the device needs. The value specified
in this register is in units of 0.25 microseconds. Values of
zero indicate that the device has no major requirements
for the settings of Latency Timers. The LSI53C810A sets
the Min_Gnt register to 0x11.
PCI Functional Description
Register: 0x3F
Max_Lat
Read Only
7
0
ML
0
ML
1
0
0
0
0
0
0
Max_Lat
[7:0]
This register is used to specify the desired settings for
Latency Timer values. Max_Lat is used to specify how
often the device needs to gain access to the PCI bus.
The value specified in these registers is in units of
0.25 microseconds. Values of zero indicate that the
device has no major requirements for the settings of
Latency Timers. The LSI53C810A sets the Max_Lat
register to 0x40.
Configuration Registers
3-19
3-20
PCI Functional Description
Chapter 4
Signal Descriptions
This chapter presents the LSI53C860 pin configuration and signal
definitions using tables and illustrations. Figure 4.1 is the pin diagram
and Figure 4.2 is a functional signal grouping. The pin definitions are
presented in Table 4.1 through Table 4.8. This chapter is divided into the
following sections:
•
Section 4.1, “PCI Bus Interface Signals”
•
Section 4.2, “SCSI Bus Interface Signals”
LSI53C860 PCI to Ultra SCSI I/O Processor
4-1
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
Vss-C
LSI53C860 Pin Diagram
AD22
Vss-I
AD23
IDSEL
C_BE3/
AD24
AD25
Vss-I
AD26
AD27
Vdd-I
AD28
AD29
Vss-I
AD30
AD31
Vdd-C
REQ/
GNT/
Figure 4.1
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
LSI53C860
100- Pin QFP
AD9
Vss-I
AD8
C_BEQ/
AD7
AD6
Vss-I
AD5
AD4
Vdd-I
AD3
AD2
Vss-I
AD1
AD0
Vdd-C
IRQ/
GP100_FETCH/
GP01_MASTER/
Vss-O
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
AD21
AD20
Vdd-I
AD19
Vss-I
AD18
AD17
AD16
Vss-I
C_BE2/
FRAME/
IRDY/
Vss-I
TRDY/
DEVSEL/
vdd-I
STOP
Vss-I
PERR/
PAR
C_BE1/
Vss-I
AD15
AD14
AD13
Vss-I
AD12
Vdd-I
Ad11
AD10
Note: NC pins are not connected.
4-2
Signal Descriptions
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
CLK
RST/
SERR/
Vdd-S
SD0/
SD1/
SD2/
Vss-S
SD3/
SD4/
SD5/
SD6/
Vss-S
SD7/
SDP/
SATN/
SBSY/
Vss-S
SACK/
SRST/
SMSG/
SSEL/
Vss-S
SCD/
SREQ/
SIO/
Vdd-S
MAC/_TESTOUT
TESTIN
SCLK
Note:
The decoupling capacitor arrangement shown above is
recommended to maximize the benefits of the internal split
ground system. Capacitor values between 0.01 and 0.1 µF
should provide adequate noise isolation. Because of the
number of high current drivers on the LSI53C860, a
multilayer PC board with power and ground planes is
required.
A slash (/) at the end of the signal name indicates that the active state
occurs when the signal is at a LOW voltage. When the slash is absent,
the signal is active at a HIGH voltage.
There are four signal type definitions:
I
Input, a standard input only signal.
O
Output, a standard output driver (typically a Totem Pole Output).
T/S
3-state, a bidirectional, 3-state input/output signal.
S/T/S
Sustained 3-state, an active LOW 3-state signal owned and driven by
one and only one agent at a time.
Table 4.1 describes the Power and Ground Signals group.
Table 4.1
Power and Ground Signals
Name
Pin No.
Description
VSS-I
5, 9, 13, 18, 22, 26, 32, 37, 43,
87, 93, 99
Power supplies to the PCI I/O pins.
VDD-I1
3, 16, 28, 40, 90
Power supplies to the PCI I/O pins.
VSS-S
58, 63, 68, 73
Power supplies to the SCSI bus I/O pins.
VDD-S
54, 77
Power supplies to the SCSI bus I/O pins.
VSS-C
50, 81
Power supplies to the internal logic core.
VDD-C
46, 84
Power supplies to the internal logic core.
1. These pins can accept a VDD source of 3.3 or 5 V. All other VDD pins must be supplied 5 V.
4-3
Figure 4.2
System
Functional Signal Grouping
CLK
RST
Address
and
Data
AD[31:0]
C_BE/[3:0]
PAR
Interface
Control
FRAME/
TRDY/
IRDY/
STOP/
DEVSEL/
IDSEL
Arbitration
REQ/
GNT/
Error
Reporting
PERR/
SERR/
4-4
Signal Descriptions
SCLK
SD[7:0]
SDP
SCTRL/
TESTIN/
GPIO0_FETCH/
GPIO1_MASTER/
MAC/_TESTOUT
IRQ/
SCSI Bus
Interface
Additional
Interface
4.1 PCI Bus Interface Signals
The PCI signal definitions are organized into the following functional
groups: Power and Ground Signals, System Signals, Address and Data
Signals, Interface Control Signals, Arbitration Signals, and Error
Reporting Signals.
4.1.1 System Signals
Table 4.2 describes the System Signals group.
Table 4.2
System Signals
Name Pin No. Type Description
CLK
80
I
Clock provides timing for all transactions on the PCI bus and is an input to
every PCI device. All other PCI signals are sampled on the rising edge of
CLK, and other timing parameters are defined with respect to this edge.
Clock can optionally serve as the SCSI core clock, but this may effect fast
SCSI transfer rates.
RST/
79
I
Reset forces the PCI sequencer of each device to a known state. All T/S
and S/T/S signals are forced to a high impedance state, and all internal logic
is reset. The RST/ input is synchronized internally to the rising edge of CLK.
The CLK input must be active while RST/ is active to properly reset the
device.
PCI Bus Interface Signals
4-5
4.1.2 Address and Data Signals
Table 4.3 describes the Address and Data Signals group.
Table 4.3
Address and Data Signals
Name
Pin No.
Type Description
AD[31:0]
85, 86, 88, 89,
91, 92, 94, 95,
98, 100, 1, 2, 4,
6, 7, 8, 23, 24,
25, 27, 29, 30,
31, 33, 35, 36,
38, 39, 41, 42,
44, 45
T/S
Physical Dword Address and Data are multiplexed on the
same PCI pins. During the first clock of a transaction,
AD[31:0] contain a physical byte address. During subsequent
clocks, AD[31:0] contain data. A bus transaction consists of
an address phase followed by one or more data phases. PCI
supports both read and write bursts. AD[7:0] define the least
significant byte, and AD[31:24] define the most significant
byte.
C_BE/[3:0] 96, 10, 21, 34
T/S
Bus Command and Byte Enables are multiplexed on the
same PCI pins. During the address phase of a transaction,
C_BE/[3:0] define the bus command. During the data phase,
C_BE/[3:0] are used as byte enables. The byte enables
determine which byte lanes carry meaningful data. C_BE/[0]
applies to byte 0, and C_BE/[3] to byte 3.
PAR
T/S
Parity is the even parity bit that protects the AD[31:0] and
C_BE/[3:0] lines. During address phase, both the address and
command bits are covered. During data phase, both data and
byte enables are covered.
4-6
20
Signal Descriptions
4.1.3 Interface Control Signals
Table 4.4 describes the Interface Control Signals group.
Table 4.4
Name
Interface Control Signals
Pin No.
Type
Description
FRAME/
11
S/T/S
Cycle Frame is driven by the current master to indicate the beginning
and duration of an access. FRAME/ is asserted to indicate that a bus
transaction is beginning. While FRAME/ is asserted, data transfers
continue. While FRAME/ is deasserted, either the transaction is in the
final data phase or the bus is idle.
TRDY/
14
S/T/S
Target Ready indicates the target agent’s (selected device’s) ability
to complete the current data phase of the transaction. TRDY/ is used
with IRDY/. A data phase is completed on any clock when used with
IRDY/. A data phase is completed on any clock when both TRDY/ and
IRDY/ are sampled asserted. During a read, TRDY/ indicates that
valid data is present on AD[31:0]. During a write, it indicates that the
target is prepared to accept data. Wait cycles are inserted until both
IRDY/ and TRDY/ are asserted together.
IRDY/
12
S/T/S
Initiator Ready indicates the initiating agent’s (bus master’s) ability to
complete the current data phase of the transaction. IRDY/ is used
with TRDY/. A data phase is completed on any clock when both IRDY/
and TRDY/ are sampled asserted. During a write, IRDY/ indicates that
valid data is present on AD[31:0]. During a read, it indicates that the
master is prepared to accept data. Wait cycles are inserted until both
IRDY/ and TRDY/ are asserted together.
STOP/
17
S/T/S
Stop indicates that the selected target is requesting the master to
stop the current transaction.
DEVSEL/ 15
S/T/S
Device Select indicates that the driving device has decoded its
address as the target of the current access. As an input, it indicates
to a master whether any device on the bus has been selected.
I
Initialization Device Select is used as a chip select in place of the
upper 24 address lines during configuration read and write
transactions.
IDSEL
97
PCI Bus Interface Signals
4-7
4.1.4 Arbitration Signals
Table 4.5 describes the Arbitration Signals group.
Table 4.5
Arbitration Signals
Name Pin No.
Type Description
REQ/
83
O
Request indicates to the system arbiter that this agent desires use of the
PCI bus. This is a point-to-point signal. Every master has its own REQ/
signal.
GNT/
82
I
Grant indicates to the agent that access to the PCI bus has been granted.
This is a point-to-point signal. Every master has its own GNT/ signal.
4.1.5 Error Reporting Signals
Table 4.6 describes the Error Reporting Signals group.
Table 4.6
Name
Error Reporting Signals
Type
Description
PERR/ 19
S/T/S
Parity Error may be pulsed active by an agent that detects a data
parity error. PERR/ can be used by any agent to signal data corruption.
However, on detection of a PERR/ pulse, the central resource may
generate a nonmaskable interrupt to the host CPU, which often implies
the system is unable to continue operation once error processing is
complete.
SERR/ 78
O
4-8
Pin No.
System Error is an open drain output used to report address parity
errors.
Signal Descriptions
4.2 SCSI Bus Interface Signals
The SCSI signal definitions are organized into the following functional
groups: SCSI Bus Interface Signals and Additional Interface Signals.
4.2.1 SCSI Bus Interface Signals
Table 4.7 describes the SCSI Bus Interface Signals group.
Table 4.7
SCSI Bus Interface Signals
Name
Pin No.
SCLK
51
SD[7:0],
SDP
SCTRL/
Type Description
I
SCSI Clock is used to derive all SCSI-related timings.
The speed of this clock is determined by the application
requirements. In some applications, SCLK may be
sourced internally from the PCI bus clock (CLK). If SCLK
is internally sourced, tie the SCLK pin LOW.
67, 69, 70, 71, 72,
74, 75, 76, 66
I/O
SCSI Data includes the following data lines and parity
signals: SD[7:0] (8-bit SCSI data bus), and SDP (SCSI
data parity bit).
57, 55, 60, 56, 62,
64, 65, 61, 59
I/O
SCSI Control includes the following signals:
SCD/
SCSI phase line, command/data
SIO/
SCSI phase line, input/output
SMSG/
SCSI phase line, message
SREQ/
Data handshake signal from target device
SACK/
Data handshake signal from initiator device
SBSY/
SCSI bus arbitration signal, busy
SATN/
SCSI Attention, the initiator is requesting a
message out phase
SRST/
SCSI bus reset
SSEL/
SCSI bus arbitration signal, select device
SCSI Bus Interface Signals
4-9
4.2.2 Additional Interface Signals
Table 4.8 describes the Additional Interface Signals group.
Table 4.8
Additional Interface Signals
Name
Pin No. Type Description
TESTIN/
52
I
Test In. When this pin is driven LOW, the LSI53C860 connects all
inputs and outputs to an “AND tree.” The SCSI control signals and data
lines are not connected to the “AND tree.” The output of the “AND tree”
is connected to the Test Out pin. This allows manufacturers to verify
chip connectivity and determine exactly which pins are not properly
attached. When the TESTIN pin is driven LOW, internal pull-ups are
enabled on all input, output, and bidirectional pins, all outputs and
bidirectional signals will be 3-stated, and the MAC/_TESTOUT pin will
be enabled. Connectivity can be tested by driving one of the LSI53C860
pins LOW. The MAC/_TESTOUT pin should respond by also driving
LOW.
GPIO0_
FETCH/
48
I/O
General Purpose I/O pin. Optionally, when driven LOW, this pin
indicates that the next bus request will be for an opcode fetch. This pin
powers up as a general purpose input.
This pin has two specific purposes in the LSI Logic SDMS software.
SDMS software uses it to toggle SCSI device LEDs, turning on the LED
whenever the LSI53C860 is on the SCSI bus. SDMS software drives
this pin LOW to turn on the LED, or drives it HIGH to turn off the LED.
This signal can also be used as data I/O for serial EEPROM access. In
this case it is used with the GPIO0 pin, which serves as a clock, and
the pin can be controlled from PCI configuration register 0x35 or
observed from the General Purpose (GPREG) operating register, at
address 0x07.
GPIO1_
MASTER/
49
I/O
General Purpose I/O pin. Optionally, when driven LOW, indicates that
the LSI53C860 is bus master. This pin powers up as a general purpose
input.
LSI Logic SDMS software supports use of this signal in serial EEPROM
applications, when enabled, in combination with the GPIO0 pin. When
this signal is used as a clock for serial EEPROM access, the GPIO1 pin
serves as data, and the pin is controlled from PCI configuration register
0x35.
4-10
Signal Descriptions
Table 4.8
Additional Interface Signals (Cont.)
Name
Pin No. Type Description
MAC/_
TESTOUT
53
T/S
Memory Access Control. This pin can be programmed to indicate
local or system memory accesses (non-PCI applications). It is also
used to test the connectivity of the LSI53C860 signals using an “AND
tree” scheme. The MAC/_TESTOUT pin is only driven as the Test Out
function when the TESTIN/ pin is driven LOW.
IRQ/
47
O
Interrupt. This signal, when asserted LOW, indicates that an
interrupting condition has occurred and that service is required from the
host CPU. The output drive of this pin is programmed as either open
drain with an internal weak pull-up or, optionally, as a totem pole driver.
Refer to the description of DMA Control (DCNTL) register, bit 3, for
additional information.
SCSI Bus Interface Signals
4-11
4-12
Signal Descriptions
Chapter 5
Operating Registers
This section contains descriptions of all LSI53C860 operating registers.
Table 5.1, the register map, lists registers by operating and configuration
addresses. The terms “set” and “assert” are used to refer to bits that are
programmed to a binary one. Similarly, the terms “deassert,” “clear,” and
“reset” are used to refer to bits that are programmed to a binary zero.
Any bits marked as reserved should always be written to zero; mask all
information read from them. Reserved bit functions may be changed at
any time. Unless otherwise indicated, all bits in registers are active high,
that is, the feature is enabled by setting the bit. The bottom row of every
register diagram shows the default register values, which are enabled
after the chip is powered on or reset.
Note:
The only register that the host CPU can access while the
LSI53C860 is executing SCRIPTS is the Interrupt Status
(ISTAT) register. Attempts to access other registers will
interfere with the operation of the chip. However, all
operating registers are accessible with SCRIPTS. All read
data is synchronized and stable when presented to the PCI
bus.
The LSI53C860 cannot fetch SCRIPTS instructions from
the operating register space. Instructions must be fetched
from system memory.
LSI53C860 PCI to Ultra SCSI I/O Processor
5-1
Table 5.1
LSI53C860 Register Address Map
31
16 15
SCNTL3
GPREG
SBCL
SSTAT2
SCNTL2
SDID
SSID
SSTAT1
CTEST3
Reserved
CTEST2
0
SCNTL1
SXFER
SOCL
SSTAT0
SCNTL0
SCID
SFBR
DSTAT
CTEST1
ISTAT
Reserved
DSA
TEMP
CTEST6
DCMD
CTEST5
CTEST4
DBC
DFIFO
DIEN
DMODE
SIEN1
SWIDE
STIME1
STEST1
SIEN0
SLPAR
STIME0
STEST0
DNAD
DSP
DSPS
SCRATCHA
DCNTL
SBR
ADDER
SIST1
GPCNTL
Reserved
STEST3
SIST0
MACNTL
RESPID
STEST2
Reserved
Reserved
Reserved
SIDL
SODL
SBDL
SCRATCH B
5-2
Operating Registers
Mem I/O
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
0x20
0x24
0x28
0x2C
0x30
0x34
0x38
0x3C
0x40
0x44
0x48
0x4C
0x50
0x54
0x58
0x5C
Config
0x80
0x84
0x88
0x8C
0x90
0x94
0x98
0x9C
0xA0
0xA4
0xA8
0xAC
0xB0
0xB4
0xB8
0xBC
0xC0
0xC4
0xC8
0xCC
0xD0
0xD4
0xD8
0xDC
Register: 0x00 (0x80)
SCSI Control Zero (SCNTL0)
Read/Write
7
6
ARB[1:0]
1
ARB[1:0]
1
5
4
3
2
1
0
START
WATN
EPC
R
AAP
TRG
0
0
0
x
0
0
Arbitration Mode Bits 1 and 0
[7:6]
ARB1
ARB0
Arbitration Mode
0
0
Simple arbitration
0
1
Reserved
1
0
Reserved
1
1
Full arbitration, selection/reselection
Simple Arbitration
1.
The LSI53C860 waits for a bus free condition to
occur.
2.
It asserts SBSY/ and its SCSI ID (contained in the
SCSI Chip ID (SCID) register) onto the SCSI bus. If
the SSEL/ signal is asserted by another SCSI
device, the LSI53C860 deasserts SBSY/, deasserts
its ID, and sets the Lost Arbitration bit (bit 3) in the
SCSI Status Zero (SSTAT0) register.
3.
After an arbitration delay, the CPU should read the
SCSI Bus Data Lines (SBDL) register to check if a
higher priority SCSI ID is present. If no higher
priority ID bit is set, and the Lost Arbitration bit is not
set, the LSI53C860 has won arbitration.
4.
Once the LSI53C860 has won arbitration, SSEL/
must be asserted using the SCSI Output Control
Latch (SOCL) for a bus clear plus a bus settle delay
(1.2 µs) before a low level selection can be
performed.
5-3
Full Arbitration, Selection/Reselection
START
5-4
1.
The LSI53C860 waits for a bus free condition.
2.
It asserts SBSY/ and its SCSI ID (the highest priority
ID stored in the SCSI Chip ID (SCID) register) onto
the SCSI bus.
3.
If the SSEL/ signal is asserted by another SCSI
device or if the LSI53C860 detects a higher priority
ID, the LSI53C860 deasserts BSY, deasserts its ID,
and waits until the next bus free state to try
arbitration again.
4.
The LSI53C860 repeats arbitration until it wins
control of the SCSI bus. When it has won, the Won
Arbitration bit is set in the SCSI Status Zero
(SSTAT0) register, bit 2.
5.
The LSI53C860 performs selection by asserting the
following onto the SCSI bus: SSEL/, the target’s ID
(stored in the SCSI Destination ID (SDID) register),
and the LSI53C860’s ID (stored in the SCSI Chip ID
(SCID) register).
6.
After a selection is complete, the Function Complete
bit is set in the SCSI Interrupt Status Zero (SIST0)
register, bit 6.
7.
If a selection time-out occurs, the Selection
Time-Out bit is set in the SCSI Interrupt Status One
(SIST1) register, bit 2.
Start Sequence
5
When this bit is set, the LSI53C860 will start the
arbitration sequence indicated by the Arbitration Mode
bits. The Start Sequence bit is accessed directly in
low-level mode; during SCSI SCRIPTS operations, this
bit is controlled by the SCRIPTS processor. An arbitration
sequence should not be started if the connected (CON)
bit in the SCSI Control One (SCNTL1) register, bit 4,
indicates that the LSI53C860 is already connected to the
SCSI bus. This bit is automatically cleared when the
arbitration sequence is complete. If a sequence is
aborted, bit 4 in the SCSI Control One (SCNTL1) register
should be checked to verify that the LSI53C860 did not
connect to the SCSI bus.
Operating Registers
WATN
Select with SATN/ on a Start Sequence
4
When this bit is set and the LSI53C860 is in initiator
mode, the SATN/ signal will be asserted during
LSI53C860 selection of a SCSI target device. This is to
inform the target that the LSI53C860 has a message to
send. If a selection time-out occurs while attempting to
select a target device, SATN/ will be deasserted at the
same time SSEL/ is deasserted. When this bit is clear,
the SATN/ signal will not be asserted during selection.
When executing SCSI SCRIPTS, this bit is controlled by
the SCRIPTS processor, but it may be set manually in
low level mode.
EPC
Enable Parity Checking
3
When this bit is set, the SCSI data bus is checked for odd
parity when data is received from the SCSI bus in either
initiator or target mode. If a parity error is detected, bit 0
of the SCSI Interrupt Status Zero (SIST0) register is set
and an interrupt may be generated.
If the LSI53C860 is operating in initiator mode and a
parity error is detected, SATN/ can optionally be
asserted, but the transfer continues until the target
changes phase. When this bit is cleared, parity errors are
not reported.
R
Reserved
2
AAP
Assert SATN/ on Parity error
1
When this bit is set, the LSI53C860 automatically asserts
the SATN/ signal upon detection of a parity error. SATN/
is only asserted in initiator mode. The SATN/ signal is
asserted before deasserting SACK/ during the byte
transfer with the parity error. The Enable Parity Checking
bit must also be set for the LSI53C860 to assert SATN/
in this manner. A parity error is detected on data received
from the SCSI bus.
If the Assert SATN/ on Parity Error bit is cleared or the
Enable Parity Checking bit is cleared, SATN/ will not be
automatically asserted on the SCSI bus when a parity
error is received.
TRG
Target Role
0
This bit determines the default operating role of the
LSI53C860. The user must manually set target or initiator
5-5
role. This can be done using the SCRIPTS language (SET
TARGET or CLEAR TARGET). When this bit is set, the chip
is a target device by default. When this bit is cleared, the
LSI53C860 is an initiator device by default.
Caution:
Writing this bit while not connected may cause the loss of
a selection or reselection due to the changing of target or
initiator roles.
Register: 0x01 (0x81)
SCSI Control One (SCNTL1)
Read/Write
5-6
7
6
5
4
3
2
1
0
EXC
ADB
DHP
CON
RST
AESP
IARB
SST
0
0
0
0
0
0
0
0
EXC
Extra Clock Cycle of Data Setup
7
When this bit is set, an extra clock period of data setup
is added to each SCSI data send transfer. The extra data
setup time can provide additional system design margin,
though it will affect the SCSI transfer rates. Clearing this
bit disables the extra clock cycle of data setup time.
Setting this bit only affects SCSI send operations.
ADB
Assert SCSI Data Bus
6
When this bit is set, the LSI53C860 drives the contents
of the SCSI Output Data Latch (SODL) register onto the
SCSI data bus. When the LSI53C860 is an initiator, the
SCSI I/O signal must be inactive to assert the SODL
contents onto the SCSI bus. When the LSI53C860 is a
target, the SCSI I/O signal must be active for the SODL
contents to be asserted onto the SCSI bus. The contents
of the SCSI Output Data Latch (SODL) register can be
asserted at any time, even before the LSI53C860 is
connected to the SCSI bus. This bit should be cleared
when executing SCSI SCRIPTS. It is normally used only
for diagnostics testing or operation in low level mode.
DHP
Disable Halt on Parity Error or ATN (Target Only) 5
The DHP bit is only defined for target role. When this bit
is cleared, the LSI53C860 halts the SCSI data transfer
when a parity error is detected or when the SATN/ signal
is asserted. If SATN/ or a parity error is received in the
Operating Registers
middle of a data transfer, the LSI53C860 may transfer up
to three additional bytes before halting to synchronize
between internal core cells. During synchronous
operation, the LSI53C860 transfers data until there are
no outstanding synchronous offsets. If the LSI53C860 is
receiving data, any data residing in the DMA FIFO is sent
to memory before halting.
When this bit is set, the LSI53C860 does not halt the
SCSI transfer when SATN/ or a parity error is received.
CON
Connected
4
This bit is automatically set any time the LSI53C860 is
connected to the SCSI bus as an initiator or as a target.
It is set after the LSI53C860 successfully completes
arbitration or when it has responded to a bus initiated
selection or reselection. This bit is also set after the chip
wins simple arbitration when operating in low level mode.
When this bit is clear, the LSI53C860 is not connected to
the SCSI bus.
The CPU can force a connected or disconnected
condition by setting or clearing this bit. This feature would
be used primarily during loopback mode.
RST
Assert SCSI RST/ Signal
Setting this bit asserts the SRST/ signal. The SRST/
output remains asserted until this bit is cleared. The
25 µs minimum assertion time defined in the SCSI
specification must be timed out by the controlling
microprocessor or a SCRIPTS loop.
3
AESP
Assert Even SCSI Parity (force bad parity)
2
When this bit is set, the LSI53C860 asserts even parity.
It forces a SCSI parity error on each byte sent to the
SCSI bus from the LSI53C860. If parity checking is
enabled, then the LSI53C860 checks data received for
odd parity. This bit is used for diagnostic testing and
should be clear for normal operation. It can be used to
generate parity errors to test error handling functions.
IARB
Immediate Arbitration
1
Setting this bit causes the SCSI core to immediately
begin arbitration once a Bus Free phase is detected
following an expected SCSI disconnect. This bit is useful
5-7
for multithreaded applications. The ARB[1:0] bits in SCSI
Control Zero (SCNTL0) should be set for full arbitration
and selection before setting this bit.
Arbitration will be retried until won. At that point, the
LSI53C860 will hold BSY and SEL asserted, and wait for
a select or reselect sequence to be requested. The
Immediate Arbitration bit will be reset automatically when
the selection or reselection sequence is completed, or
times out. Interrupts will not occur until after this bit is
reset.
An unexpected disconnect condition will clear IARB
without attempting arbitration. See the SCSI Disconnect
Unexpected bit (SCSI Control Two (SCNTL2), bit 7) for
more information on expected versus unexpected
disconnects.
An immediate arbitration sequence can be aborted. First,
the Abort bit in the Interrupt Status (ISTAT) register
should be set. Then one of two things will eventually
happen:
• The Won Arbitration bit (SCSI Status Zero (SSTAT0),
bit 2) will be set. In this case, the Immediate
Arbitration bit needs to be reset. This will complete the
abort sequence and disconnect the LSI53C860 from
the SCSI bus. If it is not acceptable to go to Bus Free
phase immediately following the arbitration phase, a
low level selection may be performed instead.
• The abort will complete because the LSI53C860 loses
arbitration. This can be detected by the Immediate
Arbitration bit being cleared. The Lost Arbitration bit
(SCSI Status Zero (SSTAT0), bit 3) should not be
used to detect this condition. No further action needs
to be taken in this case.
SST
5-8
Start SCSI Transfer
0
This bit is automatically set during SCRIPTS execution,
and should not be used. It causes the SCSI core to begin
a SCSI transfer, including SREQ/SACK handshaking.
The determination of whether the transfer is a send or
receive is made according to the value written to the I/O
bit in SCSI Output Control Latch (SOCL). This bit is
self-clearing. It should not be set for low level operation.
Operating Registers
Caution:
Writing to this register while not connected may cause the
loss of a selection/reselection by resetting the Connected
bit.
Register: 0x02 (0x82)
SCSI Control Two (SCNTL2)
Read/Write
7
6
0
SDU
0
R
x
x
x
x
x
x
x
SDU
SCSI Disconnect Unexpected
7
This bit is valid in initiator mode only. When this bit is set,
the SCSI core is not expecting the SCSI bus to enter the
Bus Free phase. If it does, an unexpected disconnect
error will be generated (see the Unexpected Disconnect
bit in the SCSI Interrupt Status Zero (SIST0) register,
bit 2). During normal SCRIPTS mode operation, this bit is
set automatically whenever the SCSI core is reselected
or successfully selects another SCSI device. The SDU bit
should be reset with a register write (Move 0x7f and
SCNTL2 TO SCNTL2) before the SCSI core expects a
disconnect to occur, normally prior to sending an Abort,
Abort Tag, Bus Device Reset, Clear Queue or Release
Recovery message, or before deasserting SACK/ after
receiving a Disconnect command or Command Complete
message.
R
Reserved
[6:0]
5-9
Register: 0x03 (0x83)
SCSI Control Three (SCNTL3)
Read/Write
7
6
4
Ultra
0x
ULTRA
SCF[2:0]
0
0
3
2
R
0
x
0
CCF[2:0]
0
0
0
ULTRA Enable
7
Setting this bit enables Ultra SCSI synchronous SCSI
transfers in systems that have an 80 MHz clock. The
default value of this bit is 0. This bit should remain
cleared in systems that have a 40 MHz clock.
When this bit is set, the signal filtering period for SREQ/
and SACK/ automatically changes to 15 ns, regardless of
the value of the Extend REQ/ACK Filtering bit in the SCSI
Test Two (STEST2) register.
SCF[2:0]
Synchronous Clock Conversion Factor
[6:4]
These bits select the factor by which the frequency of
SCLK is divided before being presented to the
synchronous SCSI control logic. The bits are encoded as
per Table 5.2. For synchronous receive, the output of this
divider is always divided by 4 and that value determines
the transfer rate. For example, if SCLK is 80 MHz, and
the SCF value is set to divide by one, then the maximum
synchronous receive rate is 20 Mbytes/s ((80/1)/4 = 20.
For synchronous send, the output of this divider gets
divided by the transfer period (XFERP) bits in the SCSI
Transfer (SXFER) register, and that value determines the
transfer rate. For valid combinations of the SCF and
XFERP, see Table 5.4 and Table 5.5.
5-10
Operating Registers
Table 5.2
Note:
Synchronous Clock Conversion Factor
SCF2
SCF1
SCF0
Factor Frequency
0
0
0
SCLK/3
0
0
1
SCLK/1
0
1
0
SCLK/1.5
0
1
1
SCLK/2
1
0
0
SCLK/3
1
0
1
SCLK/4
1
1
0
Reserved
1
1
1
Reserved
To migrate from a Fast SCSI-2 system with a 40 MHz clock,
divide the clock by a factor of two or more to achieve the
same synchronous transfer rate in a system with an
80 MHz clock.
For additional information on how the synchronous transfer
rate is determined, see Section 2.6.3, “Synchronous Operation,” page 2-13.
R
Reserved
3
CCF[2:0]
Clock Conversion Factor
[2:0]
These bits select the frequency of the SCLK for
asynchronous SCSI operations. The bits are encoded as
per the following table. All other combinations are
reserved and should never be used.
5-11
Table 5.3
Asynchronous Clock Conversion Factor
CCF2
CCF1
CCF0
SCSI Clock (MHz)
0
0
0
50.01–66.00
0
0
1
16.67–25.00
0
1
0
25.01–37.50
0
1
1
37.51–50.00
1
0
0
50.01–66.00
1
0
1
75.01–80.00
1
1
0
Reserved
1
1
1
Reserved
Register: 0x04 (0x84)
SCSI Chip ID (SCID)
Read/Write
5-12
7
6
5
R
RRE
SRE
x
0
0
4
3
2
R
x
0
ENC[2:0]
0
0
0
0
R
Reserved
RRE
Enable Response to Reselection
6
When this bit is set, the LSI53C860 is enabled to respond
to bus-initiated reselection at the chip ID in the Response
ID (RESPID) register. Note that the LSI53C860 will not
automatically reconfigure itself to initiator mode as a
result of being reselected.
SRE
Enable Response to Selection
5
When this bit is set, the LSI53C860 is able to respond to
bus-initiated selection at the chip ID in the Response ID
(RESPID) register. Note that the LSI53C860 will not
automatically reconfigure itself to target mode as a result
of being selected.
Operating Registers
7
R
Reserved
[4:3]
ENC{2:0]
Encoded LSI53C860 Chip SCSI ID
[2:0]
These bits are used to store the LSI53C860 encoded
SCSI ID. This is the ID which the chip will assert when
arbitrating for the SCSI bus. The IDs that the LSI53C860
will respond to when being selected or reselected are
configured in the Response ID (RESPID) register. The
priority of the 8 possible IDs, in descending order is:
Highest
7
6
5
Lowest
4
3
2
1
0
Register: 0x05 (0x85)
SCSI Transfer (SXFER)
Read/Write
7
5
TP[2:0]
0
Note:
0
4
3
0
R
0
x
MO[3:0]
0
0
0
0
When using Table Indirect I/O commands, bits [7:0] of this
register will be loaded from the I/O data structure.
For additional information on how the synchronous transfer
rate is determined, refer to Chapter 2, “Functional Description.”
TP[2:0]
Note:
SCSI Synchronous Transfer Period
[7:5]
These bits determine the SCSI synchronous transfer
period (XFERP) used by the LSI53C860 when sending
synchronous SCSI data in either initiator or target mode.
These bits control the programmable dividers in the chip.
For Ultra SCSI transfers, the ideal transfer period is 4, and
5 is acceptable. Setting the transfer period to a value
greater than 5 is not recommended.
5-13
TP2
TP1
TP0
XFERP
0
0
0
4
0
0
1
5
0
1
0
6
0
1
1
7
1
0
0
8
1
0
1
9
1
1
0
10
1
1
1
11
Use the following formula to calculate the synchronous
send and receive rates. Table 5.4 and Table 5.5 show
examples of possible bit combinations.
Synchronous Send Rate = (SCLK/SCF)/XFERP
Synchronous Receive Rate = (SCLK/SCF) /4
Where:
Table 5.4
SCLK
SCSI clock
SCF
Synchronous Clock Conversion Factor,
SCNTL3 register, bits [6:4]
XFERP
Transfer period, SXFER register, bits [7:5]
Examples of Synchronous Transfer Periods and Rates
for SCSI-1
Synch.
SCF ÷
XFERP
Synch.
Synch.
Receive
Synch.
SCLK SCNTL3 SXFER Send Rate
Send
Rate
Receive
(MHz) Bits [6:4] Bits [7:5] (Mbytes/s) Period (ns) (Mbytes/s) Period (ns)
80
5-14
4
4
5
200
5
200
80
4
5
4
250
5
200
66.67
3
4
5.55
180
5.55
180
66.67
3
5
4.44
225
5.55
180
50
2
4
6.25
160
6.25
160
50
2
5
5
200
6.25
160
Operating Registers
Table 5.4
Examples of Synchronous Transfer Periods and Rates
for SCSI-1 (Cont.)
Synch.
SCF ÷
XFERP
Synch.
Synch.
Receive
Synch.
SCLK SCNTL3 SXFER Send Rate
Send
Rate
Receive
(MHz) Bits [6:4] Bits [7:5] (Mbytes/s) Period (ns) (Mbytes/s) Period (ns)
40
2
4
5
200
5
200
37.50
1.5
4
6.25
160
6.25
160
33.33
1.5
4
5.55
180
5.55
180
25
1
4
6.25
160
6.25
160
20
1
4
5
200
5
200
16.67
1
4
4.17
240
4.17
240
Table 5.5
Examples of Synchronous Transfer Periods and
Rates for Fast SCSI
XFERP
SCF ÷ SXFER
Synch.
SCLK SCNTL3
Bits Send Rate
(MHz) Bits [6:4] [7:5] (Mbytes/s)
Synch.
Send
Period
(ns)
Synch.
Receive
Synch.
Rate
Receive
(Mbytes) Period (ns)
80
1
4
20
50
20
50
80
2
4
10
100
10
100
66.67
1.5
4
11.11
90
11.11
90
66.67
1
5
8.88
112.5
11.11
90
50
1
4
12.5
80
12.5
80
50
1
5
10
100
12.5
80
40
1
4
10
100
10.0
100
37.50
1
4
9.375
106.67
9.375
106.67
33.33
1
4
8.33
120
8.33
120
25
1
4
6.25
160
6.25
160
20
1
4
5
200
5
200
16.67
1
4
4.17
240
4.17
240
R
Reserved
4
MO[3:0]
Max SCSI Synchronous Offset
[3:0]
These bits describe the maximum SCSI synchronous
offset used by the LSI53C860 when transferring
synchronous SCSI data in either initiator or target mode.
5-15
The following table describes the possible combinations
and their relationship to the synchronous data offset used
by the LSI53C860. These bits determine the
LSI53C860’s method of transfer for Data-In and Data-Out
phases only. All other information transfers will occur
asynchronously.
Table 5.6
SCSI Synchronous Offset Values
MO3
MO2
MO1
MO0
Synchronous Offset
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
x
x
1
0
0
1
1
0
0
1
1
0
x
1
x
0
1
0
1
0
1
0
1
0
1
x
x
0-Asynchronous
1
2
3
4
5
6
7
8
Reserved
Reserved
Reserved
Register: 0x06 (0x86)
SCSI Destination ID (SDID)
Read/Write
7
3
2
R
x
5-16
x
x
0
ENC[3:0]
x
x
0
0
0
R
Reserved
ENC[2:0]
Encoded Destination SCSI ID
[2:0]
Writing these bits sets the SCSI ID of the intended
initiator or target during SCSI reselection or selection
phases, respectively. When executing SCRIPTS, the
SCRIPTS processor writes the destination SCSI ID to
this register. The SCSI ID is defined by the user in a
SCRIPTS SELECT or RESELECT instruction. The value
written should be the binary-encoded ID value. The
priority of the 8 possible IDs, in descending order, is:
Operating Registers
[7:3]
Highest
7
6
5
Lowest
4
3
2
1
0
Register: 0x07 (0x87)
General Purpose (GPREG)
Read/Write
7
2
1
R
x
x
x
0
GPIO[1:0]
x
x
x
0
0
R
Reserved
[7:2]
GPIO[1:0]
General Purpose
[1:0]
These bits can be programmed through the General Purpose Pin Control (GPCNTL) register to become inputs,
outputs, or special functions. These signals can also be
programmed as live inputs and sensed through a
SCRIPTS Register to Register Move Instruction.
GPIO[1:0] default as inputs. When configured as inputs,
an internal pull-up is enabled.
The LSI Logic SDMS software uses the GPIO 0 pin to
toggle SCSI device LEDs, turning on the LED whenever
the LSI53C860 is connected to the SCSI bus. SDMS
software drives this pin low to turn on the LED, or drives
it high to turn off the LED.
The GPIO[1:0] pins are used in SDMS software to access
serial NVRAM. When used for accessing serial NVRAM,
GPIO 1 is used as a clock with the GPIO 0 pin serving
as data.
5-17
Register: 0x08 (0x88)
SCSI First Byte Received (SFBR)
Read/Write
7
0
IB
0
0
0
0
0
0
0
0
This register contains the first byte received in any asynchronous
information transfer phase. For example, when the LSI53C860 is
operating in initiator role, this register contains the first byte received in
Message In, Status Phase, Reserved In and Data In.
When a Block Move instruction is executed for a particular phase, the
first byte received is stored in this register—even if the present phase is
the same as the last phase. The first byte-received value for a particular
input phase is not valid until after a MOVE instruction is executed.
This register is also the accumulator for register read-modify-writes with
the SCSI First Byte Received (SFBR) as the destination. This allows bit
testing after an operation.
The SCSI First Byte Received (SFBR) cannot be written to using the
CPU, and therefore not by a Memory Move. Additionally, the Load
instruction cannot be used to write to this register. However, the SCSI
First Byte Received (SFBR) can be loaded using SCRIPTS Read/Write
operations. To load the SCSI First Byte Received (SFBR) with a byte
stored in system memory, the byte must first be moved to an
intermediate LSI53C860 register (such as the SCRATCH register), and
then to the SCSI First Byte Received (SFBR).
This register will also contain the state of the lower eight bits of the SCSI
data bus during the selection phase if the COM bit in the DMA Control
(DCNTL) register is clear.
5-18
Operating Registers
Register: 0x09 (0x89)
SCSI Output Control Latch (SOCL)
Read /Write
7
6
5
4
3
2
1
0
REQ
ACK
BSY
SEL
ATN
MSG
C/D
I/O
0
0
0
0
0
0
0
0
REQ
Assert SCSI REQ/ Signal
7
ACK
Assert SCSI ACK/ Signal
6
BSY
Assert SCSI BSY/ Signal
5
SEL
Assert SCSI SEL/ Signal
4
ATN
Assert SCSI ATN/ Signal
3
MSG
Assert SCSI MSG/ Signal
2
C/D
Assert SCSI C_D/ Signal
1
I/O
Assert SCSI I_O/ Signal
0
This register is used primarily for diagnostic testing or programmed I/O
operation. It is controlled by the SCRIPTS processor when executing
SCSI SCRIPTS. SCSI Output Control Latch (SOCL) should only be used
when transferring data using programmed I/O. Some bits are set (1) or
reset (0) when executing SCSI SCRIPTS. Do not write to the register
once the LSI53C860 starts executing normal SCSI SCRIPTS.
5-19
Register: 0x0A (0x8A)
SCSI Selector ID (SSID)
Read Only
7
6
3
VAL
0
5-20
2
R
x
x
0
ENID[2:0]
x
x
0
0
0
VAL
SCSI Valid Bit
7
If VAL is asserted, the two SCSI IDs were detected on
the bus during a bus-initiated selection or reselection,
and the encoded destination SCSI ID bits below are valid.
If VAL is deasserted, only one ID was present and the
contents of the encoded destination ID are meaningless.
R
Reserved
ENID[2:0]
Encoded Destination SCSI ID
[2:0]
Reading the SSID register immediately after the
LSI53C860 has been selected or reselected returns the
binary-encoded SCSI ID of the device that performed the
operation. These bits are invalid for targets that are
selected under the single initiator option of the SCSI-1
specification. This condition can be detected by
examining the VAL bit above.
Operating Registers
[6:3]
Register: 0x0B (0x8B)
SCSI Bus Control Lines (SBCL)
Read Only
7
6
5
4
3
2
1
0
REQ
ACK
BSY
SEL
ATN
MSG
C/D
I/O
x
x
x
x
x
x
x
x
REQ
SREQ/ Status
7
ACK
SACK/ Status
6
BSY
SBSY/ Status
5
SEL
SSEL/ Status
4
ATN
SATN/ Status
3
MSG
SMSG/ Status
2
C/D
SC_D/ Status
1
I/O
SI_O/ Status
0
When read, this register returns the SCSI control line status. A bit will be
set when the corresponding SCSI control line is asserted. These bits are
not latched. They are a true representation of what is on the SCSI bus
at the time the register is read. The resulting read data is synchronized
before being presented to the PCI bus to prevent parity errors from being
passed to the system. This register can be used for diagnostics testing
or operation in low level mode.
Register: 0x0C (0x8C)
DMA Status (DSTAT)
Read Only
7
6
5
4
3
2
1
0
DFE
MDPE
BF
ABRT
SSI
SIR
R
IID
1
0
0
0
0
0
x
0
Reading this register will clear any bits that are set at the time the
register is read, but will not necessarily clear the register because
additional interrupts may be pending (the LSI53C860 stacks interrupts).
5-21
The DIP bit in the Interrupt Status (ISTAT) register will also be cleared.
DMA interrupt conditions may be individually masked through the DMA
Interrupt Enable (DIEN) register.
When performing consecutive 8-bit reads of the DMA Status (DSTAT),
SCSI Interrupt Status Zero (SIST0) and SCSI Interrupt Status One
(SIST1) registers (in any order), insert a delay equivalent to 12 CLK
periods between the reads to ensure that the interrupts clear properly.
See Chapter 2, “Functional Description,” for more information on
interrupts.
5-22
DFE
DMA FIFO Empty
7
This status bit is set when the DMA FIFO is empty. It may
be used to determine if any data resides in the FIFO
when an error occurs and an interrupt is generated. This
bit is a pure status bit and will not cause an interrupt.
MDPE
Master Data Parity Error
6
This bit is set when the LSI53C860 as a master detects
a data parity error, or a target device signals a parity error
during a data phase. This bit is completely disabled by
the Master Parity Error Enable bit (bit 3 of Chip Test Four
(CTEST4)).
BF
Bus Fault
5
This bit is set when a PCI bus fault condition is detected.
A PCI bus fault can only occur when the LSI53C860 is
bus master. A PCI bus fault occurs when a cycle ends
with a Bad Address or Target Abort Condition.
ABRT
Aborted
This bit is set when an abort condition occurs. An abort
condition occurs when a software abort command is
issued by setting bit 7 of the Interrupt Status (ISTAT)
register.
SSI
Single Step Interrupt
3
If the Single-Step Mode bit in the DMA Control (DCNTL)
register is set, this bit will be set and an interrupt
generated after successful execution of each SCRIPTS
instruction.
SIR
SCRIPTS Interrupt Instruction Received
2
This status bit is set whenever an Interrupt instruction is
evaluated as true.
Operating Registers
R
Reserved
1
IID
Illegal Instruction Detected
0
This status bit is set any time an illegal instruction is
detected, whether the LSI53C860 is operating in
single-step mode or automatically executing SCSI
SCRIPTS. This bit will also be set if one of the following
conditions occurs:
• If the LSI53C860 is executing a Wait Disconnect
instruction and the SCSI REQ line is asserted without
a disconnect occurring.
• If a Move, Chained Move, or Memory Move command
with a byte count of zero is fetched.
• If a Load/Store memory address maps back into chip
register space.
Register: 0x0D (0x8D)
SCSI Status Zero (SSTAT0)
Read Only
7
6
5
4
3
2
1
0
ILF
ORF
OLF
AIP
LOA
WOA
RST/
SDP/
0
0
0
0
0
0
0
0
ILF
SIDL Full
7
This bit is set when the SCSI Input Data Latch (SIDL)
register contains data. Data is transferred from the SCSI
bus to the SCSI Input Data Latch register before being
sent to the DMA FIFO and then to the host bus. The
SCSI Input Data Latch (SIDL) register contains SCSI
data received asynchronously. Synchronous data
received does not flow through this register.
ORF
SODR Full
6
This bit is set when the SCSI Output Data Register
(SODR, a hidden buffer register which is not accessible)
contains data. The SODR register is used by the SCSI
logic as a second storage register when sending data
synchronously. It cannot be read or written by the user.
This bit can be used to determine how many bytes reside
in the chip when an error occurs.
5-23
5-24
OLF
SODL Full
5
This bit is set when SCSI Output Data Latch (SODL)
contains data. The SCSI Output Data Latch (SODL)
register is the interface between the DMA logic and the
SCSI bus. In synchronous mode, data is transferred from
the host bus to the SCSI Output Data Latch (SODL)
register, and then to the SCSI Output Data Register
(SODR, a hidden buffer register which is not accessible)
before being sent to the SCSI bus. In asynchronous
mode, data is transferred from the host bus to the SCSI
Output Data Latch (SODL) register, and then to the SCSI
bus. The SODR buffer register is not used for
asynchronous transfers. This bit can be used to
determine how many bytes reside in the chip when an
error occurs.
AIP
Arbitration in Progress
4
Arbitration in Progress (AIP = 1) indicates that the
LSI53C860 has detected a Bus Free condition, asserted
BSY, and asserted its SCSI ID onto the SCSI bus.
LOA
Lost Arbitration
3
When set, LOA indicates that the LSI53C860 has
detected a bus free condition, arbitrated for the SCSI bus,
and lost arbitration due to another SCSI device asserting
the SEL/ signal.
WOA
Won Arbitration
When set, WOA indicates that the LSI53C860 has
detected a Bus Free condition, arbitrated for the SCSI
bus and won arbitration. The arbitration mode selected in
the SCSI Control Zero (SCNTL0) register must be full
arbitration and selection for this bit to be set.
RST/
SCSI RST/ Signal
1
This bit reports the current status of the SCSI RST/
signal, and the SRST bit (bit 6) in the Interrupt Status
(ISTAT) register.
SDP/
SCSI SDP/ Parity Signal
0
This bit represents the active high current status of the
SCSI SDP/ parity signal.
Operating Registers
Register: 0x0E (0x8E)
SCSI Status One (SSTAT1)
Read Only
7
4
FF[3:0]
0
FF[3:0]
SDPL
0
0
3
2
1
0
SDPL
MSG
C/D
I/O
x
x
x
x
0
FIFO Flags
[7:4]
These four bits define the number of bytes that currently
reside in the LSI53C860’s SCSI synchronous data FIFO.
These bits are not latched and they will change as data
moves through the FIFO. Because the FIFO can only
hold nine bytes, values over nine will not occur.
FF3
FF2
FF1
FF0
Bytes or Words in
the SCSI FIFO
0
0
0
0
0
0
0
0
1
1
0
0
1
0
2
0
0
1
1
3
0
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
7
1
0
0
0
8
1
0
0
1
9
Latched SCSI Parity
3
This bit reflects the SCSI parity signal (SDP/),
corresponding to the data latched in the SCSI Input Data
Latch (SIDL). It changes when a new byte is latched into
the SCSI Input Data Latch (SIDL) register. This bit is
active HIGH, in other words, it is set when the parity
signal is active.
5-25
MSG
SCSI MSG/ signal
2
C/D
SCSI C_D/ signal
1
I/O
SCSI I_O/ signal
These SCSI phase status bits are latched on the
asserting edge of SREQ/ when operating in either
initiator or target mode. These bits are set when the
corresponding signal is active. They are useful when
operating in low level mode.
0
Register: 0x0F (0x8F)
SCSI Status Two (SSTAT2)
Read Only
7
2
R
x
x
x
x
x
0
R
1
x
R
Reserved
LDSC
Last Disconnect
1
This bit is used in conjunction with the Connected (CON)
bit in SCSI Control One (SCNTL1). It allows the user to
detect the case in which a target device disconnects, and
then some SCSI device selects or reselects the
LSI53C860. If the Connected bit is asserted and the
LDSC bit is asserted, a disconnect has occurred. This bit
is set when the Connected bit in SCSI Control One
(SCNTL1) is clear. This bit is cleared when a Block Move
instruction executes while the Connected bit in SCSI
Control One (SCNTL1) is on.
R
5-26
x
1
LDSC
Reserved
Operating Registers
[7:2]
0
Registers: 0x10–0x13 (0x90–0x93)
Data Structure Address (DSA)
Read/Write
31
0
DSA
0
0
0
0
0
0
0
0
0
0
0
0
DSA
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Data Structure Address
[31:0]
This 32-bit register contains the base address used for all
table indirect calculations. The DSA register is usually
loaded prior to starting an I/O, but it is possible for a
SCRIPTS Memory Move to load the DSA during the I/O.
During any Memory-to-Memory Move operation, the
contents of this register are preserved. The power-up
value of this register is indeterminate.
Register: 0x14 (0x94)
Interrupt Status (ISTAT)
Read/Write
7
6
5
4
3
2
1
0
ABRT
SRST
SIGP
SEM
CON
INTF
SIP
DIP
0
0
0
0
0
0
0
0
This is the only register that can be accessed by the host CPU while the
LSI53C860 is executing SCRIPTS (without interfering in the operation of
the LSI53C860). It may be used to poll for interrupts if hardware
interrupts are disabled. There may be stacked interrupts pending. Read
this register after servicing an interrupt to check for stacked interrupts.
For more information on interrupt handling refer to Chapter 2, “Functional
Description.”
ABRT
Abort Operation
7
Setting this bit aborts the current operation being
executed by the LSI53C860. If this bit is set and an
interrupt is received, reset this bit before reading the
DMA Status (DSTAT) register to prevent further aborted
interrupts from being generated. The sequence to abort
any operation is:
1. Set this bit.
5-27
2. Wait for an interrupt.
3. Read the Interrupt Status (ISTAT) register.
4. If the SCSI Interrupt Pending bit is set, then read the
SCSI Interrupt Status Zero (SIST0) or SCSI Interrupt
Status One (SIST1) register to determine the cause of
the SCSI Interrupt and go back to Step 2.
5. If the SCSI Interrupt Pending bit is clear, and the DMA
Interrupt Pending bit is set, then write 0x00 value to
this register.
6. Read the DMA Status (DSTAT) register to verify the
aborted interrupt and to see if any other interrupting
conditions have occurred.
SRST
Software Reset
6
Setting this bit resets the LSI53C860. All operating
registers are cleared to their default values and all SCSI
signals are deasserted. Setting this bit does not cause
the SCSI RST/ signal to be asserted. This reset will not
clear the LSI53C700 compatibility bit or any of the PCI
configuration registers. This bit is not self-clearing; it must
be cleared to clear the reset condition (a hardware reset
will also clear this bit).
SIGP
Signal Process
5
SIGP is a R/W bit that can be written at any time, and
polled and reset using Chip Test Two (CTEST2). The
SIGP bit can be used in various ways to pass a flag to or
from a running SCRIPTS instruction.
The only SCRIPTS instruction directly affected by the
SIGP bit is Wait For Selection/Reselection. Setting this bit
causes that instruction to jump to the alternate address
immediately. The instructions at the alternate jump
address should check the status of SIGP to determine
the cause of the jump. The SIGP bit may be used at any
time and is not restricted to the wait for selection/
reselection condition.
SEM
5-28
Semaphore
4
This bit can be set by the SCRIPTS processor using a
SCRIPTS register write instruction. The bit may also be
set by an external processor while the LSI53C860 is
executing a SCRIPTS operation. This bit enables the
Operating Registers
LSI53C860 to notify an external processor of a
predefined condition while SCRIPTS are running. The
external processor may also notify the LSI53C860 of a
predefined condition and the SCRIPTS processor may
take action while SCRIPTS are executing.
CON
Connected
3
This bit is automatically set any time the LSI53C860 is
connected to the SCSI bus as an initiator or as a target.
It will be set after successfully completing selection or
when the LSI53C860 has responded to a bus-initiated
selection or reselection. It will also be set after the
LSI53C860 wins arbitration when operating in low level
mode. When this bit is clear, the LSI53C860 is not
connected to the SCSI bus.
INTF
Interrupt-on-the-Fly
2
This bit is asserted by an INTFLY instruction during
SCRIPTS execution. SCRIPTS programs will not halt
when the interrupt occurs. This bit can be used to notify
a service routine, running on the main processor while
the SCRIPTS processor is still executing a SCRIPTS
program. If this bit is set, when the Interrupt Status
(ISTAT) register is read it will not automatically be
cleared. To clear this bit, it must be written to a one. The
reset operation is self-clearing.
Note:
If the INTF bit is set but SIP or DIP is not set, do not
attempt to read the other chip status registers. An
interrupt-on-the-fly interrupt must be cleared before
servicing any other interrupts indicated by SIP or DIP.
This bit must be written to one in order to clear it after it
has been set.
SIP
SCSI Interrupt Pending
This status bit is set when an interrupt condition is
detected in the SCSI portion of the LSI53C860. The
following conditions will cause a SCSI interrupt.
1
• A phase mismatch occurs (initiator mode) or SATN/
becomes active (target mode)
• An arbitration sequence completes
• A selection or reselection time-out occurs
5-29
• The LSI53C860 was selected
• The LSI53C860 was reselected
• A SCSI gross error occurs
• An unexpected disconnect occurs
• A SCSI reset occurs
• A parity error is detected
• The handshake-to-handshake timer is expired
• The general purpose timer is expired
To determine exactly which condition(s) caused the
interrupt, read the SCSI Interrupt Status Zero (SIST0)
and SCSI Interrupt Status One (SIST1) registers.
DIP
DMA Interrupt Pending
This status bit is set when an interrupt condition is
detected in the DMA portion of the LSI53C860. The
following conditions will cause a DMA interrupt.
• A PCI parity error is detected
• A bus fault is detected
• An abort condition is detected
• A SCRIPTS instruction is executed in single-step
mode
• A SCRIPTS interrupt instruction is executed
• An illegal instruction is detected
To determine exactly which condition(s) caused the
interrupt, read the DMA Status (DSTAT) register.
5-30
Operating Registers
0
Register: 0x18 (0x98)
Chip Test Zero (CTEST0)
Read/Write
7
0
FMT
1
1
FMT
1
1
1
1
1
1
Byte Empty in DMA FIFO
[7:0]
This was a general purpose read/write register in
previous LSI53C8XX family chips. Although it is still a
read/write register, LSI Logic reserves the right to use
these bits for future LSI53C8XX family enhancements.
Register: 0x19 (0x99)
Chip Test One (CTEST1)
Read Only
7
4
3
0
FMT[3:0]
1
1
FFL[3:0]
1
1
0
0
0
0
FMT[3:0]
Byte Empty in DMA FIFO
[7:4]
These bits identify the bottom bytes in the DMA FIFO that
are empty. Each bit corresponds to a byte lane in the
DMA FIFO. For example, if byte lane three is empty, then
FMT3 will be set. Since the FMT flags indicate the status
of bytes at the bottom of the FIFO, if all FMT bits are set,
the DMA FIFO is empty.
FFL[3:0]
Byte Full in DMA FIFO
[3:0]
These status bits identify the top bytes in the DMA FIFO
that are full. Each bit corresponds to a byte lane in the
DMA FIFO. For example, if byte lane three is full then
FFL3 will be set. Since the FFL flags indicate the status
of bytes at the top of the FIFO, if all FFL bits are set, the
DMA FIFO is full.
5-31
Register: 0x1A (0x9A)
Chip Test Two (CTEST2)
Read Only
7
6
5
4
3
2
1
0
DDIR
SIGP
CIO
CM
R
TEOP
DREQ
DACK
0
0
x
x
0
0
0
1
DDIR
Data Transfer Direction
7
This status bit indicates which direction data is being
transferred. When this bit is set, the data will be
transferred from the SCSI bus to the host bus. When this
bit is clear, the data will be transferred from the host bus
to the SCSI bus.
SIGP
Signal Process
6
This bit is a copy of the SIGP bit in the Interrupt Status
(ISTAT) register (bit 5). The SIGP bit is used to signal a
running SCRIPTS instruction. When this register is read,
the SIGP bit in the Interrupt Status (ISTAT) register is
cleared.
CIO
Configured as I/O
5
This bit is defined as the Configuration I/O Enable Status
bit. This read only bit indicates if the chip is currently
enabled as I/O space.
Note:
CM
Configured as Memory
4
This bit is defined as the configuration memory enable
status bit. This read only bit indicates if the chip is
currently enabled as memory space.
Note:
5-32
Both bits 4 and 5 may be set if the chip is dual-mapped.
Both bits 4 and 5 may be set if the chip is dual-mapped.
R
Reserved
TEOP
SCSI True End of Process
2
This bit indicates the status of the LSI53C860’s internal
TEOP signal. The TEOP signal acknowledges the
completion of a transfer through the SCSI portion of the
LSI53C860. When this bit is set, TEOP is active. When
this bit is clear, TEOP is inactive.
Operating Registers
3
DREQ
Data Request Status
1
This bit indicates the status of the LSI53C860’s internal
Data Request signal (DREQ). When this bit is set, DREQ
is active. When this bit is clear, DREQ is inactive.
DACK
Data Acknowledge Status
0
This bit indicates the status of the LSI53C860’s internal
Data Acknowledge signal (DACK/). When this bit is set,
DACK/ is inactive. When this bit is clear, DACK/ is active.
Register: 0x1B (0x9B)
Chip Test Three (CTEST3)
Read/Write
7
4
V[3:0]
x
x
x
x
3
2
1
0
FLF
CLF
FM
WRIE
0
0
0
0
V[3:0]
Chip Revision Level
[7:4]
These bits identify the chip revision level for software
purposes.
FLF
Flush DMA FIFO
3
When this bit is set, data residing in the DMA FIFO is
transferred to memory, starting at the address in the DMA
Next Address (DNAD) register. The internal DMAWR
signal, controlled by the Chip Test Five (CTEST5)
register, determines the direction of the transfer. This bit
is not self-clearing; once the LSI53C860 has successfully
transferred the data, this bit should be reset.
Note:
CLF
Polling of FIFO flags is allowed during flush operations.
Clear DMA FIFO
2
When this bit is set, all data pointers for the DMA FIFO
are cleared. Any data in the FIFO is lost. This bit
automatically resets after the LSI53C860 has
successfully cleared the appropriate FIFO pointers and
registers.
Note:
This bit does not clear the data visible at the bottom of the
FIFO.
5-33
FM
Fetch Pin Mode
1
When set, this bit causes the FETCH/ pin to deassert
during indirect and table indirect read operations.
FETCH/ will only be active during the opcode portion of
an instruction fetch. This allows SCRIPTS to be stored in
a PROM while data tables are stored in RAM.
If this bit is not set, FETCH/ will be asserted for all bus
cycles during instruction fetches.
WRIE
Write and Invalidate Enable
0
This bit, when set, causes Memory Write and Invalidate
commands to be issued on the PCI bus after certain
conditions have been met. These conditions are
described in more detail in Chapter 3, “PCI Functional
Description.”
Registers: 0x1C–0x1F (0x9C–0x9F)
Temporary (TEMP)
Read/Write
31
0
TEMP
x
x
x
x
x
x
x
x
x
TEMP
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Temporary
[31:0]
This 32-bit register stores the Return instruction address
pointer from the Call instruction. The address pointer
stored in this register is loaded into the DMA SCRIPTS
Pointer (DSP) register when a Return instruction is
executed. This address points to the next instruction to be
executed. Do not write to this register while the
LSI53C860 is executing SCRIPTS.
During any Memory-to-Memory Move operation, the
contents of this register are preserved. The power-up
value of this register is indeterminate.
5-34
x
Operating Registers
Register: 0x20 (0xA0)
DMA FIFO (DFIFO)
Read/Write
7
6
0
R
x
BO[6:0]
0
0
0
0
0
0
0
R
Reserved
7
BO[6:0]
Byte Offset Counter
[6:0]
These bits indicate the amount of data transferred
between the SCSI core and the DMA core. It may be
used to determine the number of bytes in the DMA FIFO
when an interrupt occurs. These bits are unstable while
data is being transferred between the two cores. Once
the chip has stopped transferring data, these bits are
stable.
Since the DFIFO register counts the number of bytes
transferred between the DMA core and the SCSI core,
and the DMA Byte Counter (DBC) register counts the
number of bytes transferred across the host bus, the
difference between these two counters represents the
number of bytes remaining in the DMA FIFO.
The following steps will determine how many bytes are
left in the DMA FIFO when an error occurs, regardless of
the direction of the transfer:
1. Subtract the seven least significant bits of the DMA
Byte Counter (DBC) register from the 7-bit value of
the DMA FIFO (DFIFO) register.
2. AND the result with 0x7F for a byte count between
zero and 64.
Note:
To calculate the total number of bytes in both the DMA
FIFO and SCSI logic, see the section on Data Paths in
Chapter 2, “Functional Description.”
5-35
Register: 0x21 (0xA1)
Chip Test Four (CTEST4)
Read/Write
5-36
7
6
5
4
3
BDIS
ZMOD
ZSD
SRTM
MPEE
0
0
0
0
0
2
0
FBL[2:0]
0
0
0
BDIS
Burst Disable
7
When set, this bit will cause the LSI53C860 to perform
back-to-back cycles for all transfers. When reset, the
LSI53C860 performs back-to-back transfers for opcode
fetches and burst transfers for data moves. The handling
of opcode fetches is dependent on the setting of the
Burst OpCode Fetch bit in the DMA Mode (DMODE)
register.
ZMOD
High Impedance Mode
6
Setting this bit causes the LSI53C860 to place all output
and bidirectional pins into a high impedance state. In
order to read data out of the LSI53C860, this bit must be
cleared. This bit is intended for board-level testing only.
Do not set this bit during normal system operation.
ZSD
SCSI Data High Impedance
5
Setting this bit causes the LSI53C860 to place the SCSI
data bus SD[7:0] and the parity line (SDP) in a high
impedance state. In order to transfer data on the SCSI
bus, this bit must be cleared.
SRTM
Shadow Register Test Mode
4
Setting this bit allows access to the shadow registers
used by Memory-to-Memory Move operations. When this
bit is set, register accesses to the Temporary (TEMP) and
Data Structure Address (DSA) registers are directed to
the shadow copies STEMP (Shadow TEMP) and SDSA
(Shadow DSA). The registers are shadowed to prevent
them from being overwritten during a Memory-to-Memory
Move operation. The Data Structure Address (DSA) and
Temporary (TEMP) registers contain the base address
used for table indirect calculations, and the address
pointer for a call or return instruction, respectively. This bit
is intended for manufacturing diagnostics only and should
not be set during normal operations.
Operating Registers
MPEE
Master Parity Error Enable
3
Setting this bit enables parity checking during master
data phases. A parity error during a bus master read is
detected by the LSI53C860. A parity error during a bus
master write is detected by the target, and the
LSI53C860 is informed of the error by the PERR/ pin
being asserted by the target. When this bit is reset, the
LSI53C860 will not interrupt if a master parity error
occurs. This bit is reset at power-up.
FBL[2:0]
FIFO Byte Control
[2:0]
FBL2
FBL1
FBL0
DMA FIFO
Byte Lane
Pins
x
x
x
Disabled
N/A
0
0
0
0
D[7:0]
0
0
1
1
D[15:8]
0
1
0
2
D[23:16]
0
1
1
3
D[31:24]
These bits steer the contents of the Chip Test Six
(CTEST6) register to the appropriate byte lane of the
32-bit DMA FIFO. If the FBL2 bit is set, then FBL1 and
FBL0 determine which of four byte lanes can be read or
written. When cleared, the byte lane read or written is
determined by the current contents of the DNAD and
DMA Byte Counter (DBC) registers. Each of the four
bytes that make up the 32-bit DMA FIFO can be
accessed by writing these bits to the proper value. For
normal operation, FBL2 must equal zero.
Register: 0x22 (0xA2)
Chip Test Five (CTEST5)
Read/Write
7
6
5
4
3
ADCK
BBCK
R
MASR
DDIR
0
0
x
0
0
ADCK
2
0
R
x
x
x
Clock Address Incrementor
7
Setting this bit increments the address pointer contained
in the DNAD register. The DNAD register is incremented
5-37
based on the DNAD contents and the current DMA Byte
Counter (DBC) value. This bit automatically clears itself
after incrementing the DNAD register.
BBCK
Clock Byte Counter
6
Setting this bit decrements the byte count contained in
the 24-bit DMA Byte Counter (DBC) register. It is
decremented based on the DMA Byte Counter (DBC)
contents and the current DNAD value. This bit
automatically clears itself after decrementing the DMA
Byte Counter (DBC) register.
R
Reserved
MASR
Master Control for Set or Reset Pulses
4
This bit controls the operation of bit 3. When this bit is
set, bit 3 asserts the corresponding signals. When this bit
is reset, bit 3 deasserts the corresponding signals. This
bit and bit 3 should not be changed in the same write
cycle.
DDIR
DMA Direction
3
Setting this bit either asserts or deasserts the internal
DMA Write (DMAWR) direction signal depending on the
current status of the MASR bit in this register. Asserting
the DMAWR signal indicates that data will be transferred
from the SCSI bus to the host bus. Deasserting the
DMAWR signal transfers data from the host bus to the
SCSI bus.
R
Reserved
5
[2:0]
Register: 0x23 (0xA3)
Chip Test Six (CTEST6)
Read/Write
7
0
DF
0
DF
5-38
0
0
0
0
0
0
0
DMA FIFO
[7:0]
Writing to this register writes data to the appropriate byte
lane of the DMA FIFO as determined by the FBL bits in
the Chip Test Four (CTEST4) register. Reading this
register unloads data from the appropriate byte lane of
Operating Registers
the DMA FIFO as determined by the FBL bits in the Chip
Test Four (CTEST4) register. Data written to the FIFO is
loaded into the top of the FIFO. Data read out of the FIFO
is taken from the bottom. To prevent DMA data from
being corrupted, this register should not be accessed
before starting or restarting SCRIPTS operation. This
register should only be written when testing the DMA
FIFO using the Chip Test Four (CTEST4) register. Writes
to this register while the test mode is not enabled will
have unexpected results.
Register: 0x24–0x26 (0xA4–0xA6)
DMA Byte Counter (DBC)
Read/Write
23
0
DBC
x
x
x
x
x
x
x
DBC
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
DMA Byte Counter
[23:0]
This 24-bit register determines the number of bytes to be
transferred in a Block Move instruction. While sending
data to the SCSI bus, the counter is decremented as data
is moved into the DMA FIFO from memory. While
receiving data from the SCSI bus, the counter is
decremented as data is written to memory from the
LSI53C860. The DMA Byte Counter (DBC) counter is
decremented each time that data is transferred on the
PCI bus. It is decremented by an amount equal to the
number of bytes that were transferred.
The maximum number of bytes that can be transferred in
any one Block Move command is 16,777,215 bytes. The
maximum value that can be loaded into the DMA Byte
Counter (DBC) register is 0xFFFFFF. If the instruction is
a Block Move and a value of 0x000000 is loaded into the
DMA Byte Counter (DBC) register, an illegal instruction
interrupt will occur if the LSI53C860 is not in target role,
Command phase.
The DMA Byte Counter (DBC) register is also used to
hold the least significant 24 bits of the first Dword of a
SCRIPTS fetch, and to hold the offset value during table
5-39
indirect I/O SCRIPTS. For a complete description, see
Chapter 6, “Instruction Set of the I/O Processor.” The
power-up value of this register is indeterminate.
Register: 0x27 (0xA7)
DMA Command (DCMD)
Read/Write
7
0
DCMD
x
x
DCMD
x
x
x
x
x
x
DMA Command
[7:0]
This 8-bit register determines the instruction for the
LSI53C860 to execute. This register has a different
format for each instruction. For a complete description,
see Chapter 6, “Instruction Set of the I/O Processor.”
Register: 0x28–0x2B (0xA8–0xAB)
DMA Next Address (DNAD)
Read/Write
31
0
DNAD
0
0
0
0
0
0
0
0
0
DNAD
5-40
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DMA Next Address
[31:0]
This 32-bit register contains the general purpose address
pointer. At the start of some SCRIPTS operations, its
value is copied from the DMA SCRIPTS Pointer Save
(DSPS) register. Its value may not be valid except in
certain abort conditions. The default value of this register
is zero.
Operating Registers
Register: 0x2C–0x2F (0xAC–0xAF)
DMA SCRIPTS Pointer (DSP)
Read/Write
31
0
DSP
0
0
0
0
0
0
0
0
0
0
0
0
DSP
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DMA SCRIPTS Pointer
[31:0]
The CPU writes the address of the first SCRIPTS
instruction to this register to begin SCSI SCRIPTS
operation. In normal SCRIPTS operation, once the
starting address of the first SCRIPTS instruction is
written to this register, SCRIPTS instructions are
automatically fetched and executed until an interrupt
condition occurs.
In single-step mode, there is a single step interrupt after
each instruction is executed. The DMA SCRIPTS Pointer
(DSP) register does not need to be written with the next
address, but the Start DMA bit (bit 2, DMA Control
(DCNTL) register) must be set each time the step
interrupt occurs to fetch and execute the next SCRIPTS
command. When writing this register eight bits at a time,
writing the upper eight bits begins execution of the SCSI
SCRIPTS. The default value of this register is zero.
Register: 0x30–0x33 (0xB0–0xB3)
DMA SCRIPTS Pointer Save (DSPS)
Read/Write
31
0
DSPS
x
x
x
x
x
x
x
x
x
DSPS
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
DMA SCRIPTS Pointer Save
[31:0]
This register contains the second Dword of a SCRIPTS
instruction. It is overwritten each time a SCRIPTS
instruction is fetched. When a SCRIPTS interrupt
instruction is executed, this register holds the interrupt
vector. The power-up value of this register is
indeterminate.
5-41
Register: 0x34–0x37 (0xB4–0xB7)
Scratch Register A (SCRATCHA)
Read/Write
31
0
SCRATCHA
x
x
x
x
x
x
x
x
x
x
x
x
SCRATCHA
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Scratch Register A
[31:0]
This is a general purpose, user-definable scratch pad
register. Apart from CPU access, only Register
Read/Write and Memory Moves into the SCRATCH
register will alter its contents. The power-up value of this
register is indeterminate.
The LSI53C860 cannot fetch SCRIPTS instructions from
this location.
Register: 0x38 (0xB8)
DMA Mode (DMODE)
Read/Write
7
6
BL[1:0]
0
BL[1:0]
5-42
0
5
4
3
2
1
0
SIOM
DIOM
ER
ERMP
BOF
MAN
0
0
0
0
0
0
Burst Length
[7:6]
These bits control the maximum number of transfers
performed per bus ownership, regardless of whether the
transfers are back-to-back, burst, or a combination of
both. The LSI53C860 asserts the Bus Request (REQ/)
output when the DMA FIFO can accommodate a transfer
of at least one burst size of data. Bus Request (REQ/) is
also asserted during start-of-transfer and end-of-transfer
cleanup and alignment, even though less than a full burst
of transfers may be performed. The LSI53C860 inserts a
“fairness delay” of four CLKs between burst-length
transfers (as set in BL[1:0]) during normal operation. The
fairness delay is not inserted during PCI retry cycles. This
gives the CPU and other bus master devices the
opportunity to access the PCI bus between bursts.
Operating Registers
SIOM
BL1
BL0
Burst Length
0
0
2-transfer burst
0
1
4-transfer burst
1
0
8-transfer burst
1
1
16-transfer burst
Source I/O-Memory Enable
5
This bit is defined as an I/O Memory Enable bit for the
source address of a Memory Move or Block Move
Command. If this bit is set, then the source address is in
I/O space; and if reset, then the source address is in
memory space.
This function is useful for register-to-memory operations
using the Memory Move instruction when the LSI53C860
is I/O mapped. Bits 4 and 5 of the Chip Test Two
(CTEST2) register can be used to determine the
configuration status of the LSI53C860.
DIOM
Destination I/O-Memory Enable
4
This bit is defined as an I/O Memory Enable bit for the
destination address of a Memory Move or Block Move
Command. If this bit is set, then the destination address
is in I/O space; and if reset, then the destination address
is in memory space.
This function is useful for memory-to-register operations
using the Memory Move instruction when the LSI53C860
is I/O mapped. Bits 4 and 5 of the Chip Test Two
(CTEST2) register can be used to determine the
configuration status of the LSI53C860.
ERL
Enable Read Line
3
This bit enables a PCI Read Line command. If PCI cache
mode is enabled by setting bits in the PCI Cache Line
Size register, the chip issues a Read Line command on
all read cycles if other conditions are met. For more
information on these conditions, refer to Chapter 3, “PCI
Functional Description.”
5-43
ERMP
Enable Read Multiple
2
This bit, when set, will cause Read Multiple commands to
be issued on the PCI bus after certain conditions have
been met. These conditions are described in Chapter 3,
“PCI Functional Description.”
BOF
Burst OpCode Fetch Enable
1
Setting this bit causes the LSI53C860 to fetch
instructions in burst mode, if the Burst Disable bit (Chip
Test Four (CTEST4), bit7) is cleared. Specifically, the chip
will burst in the first two Dwords of all instructions using
a single bus ownership. If the instruction is a memory-tomemory move type, the third Dword will be accessed in
a subsequent bus ownership. If the instruction is an
indirect type, the additional Dword will be accessed in a
subsequent bus ownership. If the instruction is a table
indirect block move type, the chip will access the
remaining two Dwords in a subsequent bus ownership,
thereby fetching the four Dwords required in two bursts of
two Dwords each.
MAN
Manual Start Mode
0
Setting this bit prevents the LSI53C860 from
automatically fetching and executing SCSI SCRIPTS
when the DMA SCRIPTS Pointer (DSP) register is
written. When this bit is set, the Start DMA bit in the DMA
Control (DCNTL) register must be set to begin SCRIPTS
execution. Clearing this bit causes the LSI53C860 to
automatically begin fetching and executing SCSI
SCRIPTS when the DMA SCRIPTS Pointer (DSP)
register is written. This bit is not normally used for SCSI
SCRIPTS operations.
Register: 0x39 (0xB9)
DMA Interrupt Enable (DIEN)
Read/Write
7
6
5
4
3
2
1
0
R
MDPE
BF
ABRT
SSI
SIR
R
IID
x
0
0
0
0
0
x
0
This register contains the interrupt mask bits corresponding to the
interrupting conditions described in the DMA Status (DSTAT) register. An
interrupt is masked by clearing the appropriate mask bit. Masking an
5-44
Operating Registers
interrupt prevents IRQ/ from being asserted for the corresponding
interrupt, but the status bit will still be set in the DMA Status (DSTAT)
register. Masking an interrupt will not prevent the ISTAT DIP from being
set. All DMA interrupts are considered fatal, therefore SCRIPTS will stop
running when a DMA interrupt occurs, whether or not the interrupt is
masked. Setting a mask bit enables the assertion of IRQ/ for the
corresponding interrupt. (A masked nonfatal interrupt will not prevent
unmasked or fatal interrupts from getting through; interrupt stacking
begins when either the ISTAT SIP or DIP bit is set.)
The LSI53C860 IRQ/ output is latched; once asserted, it will remain
asserted until the interrupt is cleared by reading the appropriate status
register. Masking an interrupt after the IRQ/ output is asserted will not
cause IRQ/ to be deasserted.
For more information on interrupts, see Chapter 2, “Functional
Description.”
R
Reserved
7
MDPE
Master Data Parity Error
6
BF
Bus fault
5
ABRT
Aborted
4
SSI
Single step interrupt
3
SIR
SCRIPTS interrupt instruction received
2
R
Reserved
1
IID
Illegal instruction detected
0
5-45
Register: 0x3A (0xBA)
Scratch Byte Register (SBR)
Read/Write
7
0
SBR
0
0
SBR
0
0
0
0
0
0
Scratch Byte Register
[7:0]
This is a general purpose register. Apart from CPU
access, only Register Read/Write and Memory Moves
into this register will alter its contents. The default value
of this register is zero. This register was called the DMA
Watchdog Timer on previous LSI53C8XX family products.
Register: 0x3B (0xBB)
DMA Control (DCNTL)
Read/Write
5-46
7
6
5
4
3
2
1
0
CLSE
PFF
PFEN
SSM
IRQM
STD
IRQD
COM
0
0
0
0
0
0
0
0
CLSE
Cache Line Size Enable
7
Setting this bit enables the LSI53C860 to sense and react
to cache line boundaries set up by the DMA Mode
(DMODE) or PCI Cache Line Size register, whichever
contains the smaller value. Clearing this bit disables the
cache line size logic and the LSI53C860 monitors the
cache line size using the DMA Mode (DMODE) register.
PFF
Prefetch Flush
6
Setting this bit will cause the prefetch unit to flush its
contents. The bit will reset after the flush is complete.
PFEN
Prefetch Enable
5
Setting this bit enables the prefetch unit if the burst size
is equal to or greater than four. For more information on
SCRIPTS instruction prefetching, see Chapter 2, “Functional Description.”
Operating Registers
SSM
Single-Step Mode
4
Setting this bit causes the LSI53C860 to stop after
executing each SCRIPTS instruction, and generate a
single step interrupt. When this bit is clear the LSI53C860
will not stop after each instruction; instead it continues
fetching and executing instructions until an interrupt
condition occurs. This bit should be clear for normal SCSI
SCRIPTS operation. To restart the LSI53C860 after it
generates a SCRIPTS Step interrupt, read the Interrupt
Status (ISTAT) and DMA Status (DSTAT) registers to
recognize and clear the interrupt; then set the START
DMA bit in this register.
IRQM
IRQ Mode
3
When set, this bit enables a totem pole driver for the IRQ
pin. When reset, this bit enables an open drain driver for
the IRQ pin with a internal weak pull-up. This bit is reset
at power-up.
STD
Start DMA operation
2
The LSI53C860 fetches a SCSI SCRIPTS instruction
from the address contained in the DMA SCRIPTS Pointer
(DSP) register when this bit is set. This bit is required if
the LSI53C860 is in one of the following modes:
• Manual start mode – Bit 0 in the DMA Mode
(DMODE) register is set
• Single-step mode – Bit 4 in the DMA Control (DCNTL)
register is set
When the LSI53C860 is executing SCRIPTS in manual
start mode, the Start DMA bit needs to be set to start
instruction fetches. This bit will remain set until an
interrupt occurs. When the LSI53C860 is in single-step
mode, the Start DMA bit needs to be set to restart
execution of SCRIPTS after a single-step interrupt.
IRQD
IRQ Disable
1
Setting this bit 3-states the IRQ pin; clearing the bit
enables normal operation. When bit 1 in this register is
set, the IRQ/ pin will not be asserted when an interrupt
condition occurs. The interrupt is not lost or ignored, but
merely masked at the pin. Clearing this bit when an
interrupt is pending will immediately cause the IRQ/ pin
5-47
to assert. As with any register other than Interrupt Status
(ISTAT), this register cannot be accessed except by a
SCRIPTS instruction during SCRIPTS execution.
COM
LSI53C700 Family Compatibility
0
When this bit is clear, the LSI53C860 will behave in a
manner compatible with the LSI53C700 family;
selection/reselection IDs will be stored in both the SCSI
Selector ID (SSID) and SCSI First Byte Received (SFBR)
registers.
When this bit is set, the ID will be stored only in the SSID
register, protecting the SCSI First Byte Received (SFBR)
from being overwritten if a selection/reselection occurs
during a DMA register-to-register operation.
This bit is not affected by a software reset.
Register: 0x3C–0x3F (0xBC–0xBF)
Adder Sum Output (ADDER)
Read Only
31
0
ADDER
x
x
x
x
x
x
x
x
x
x
x
x
ADDER
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Adder Sum Output
[31:0]
This register contains the output of the internal adder,
and is used primarily for test purposes. The power-up
value for this register is indeterminate.
Register: 0x40 (0xC0)
SCSI Interrupt Enable Zero (SIEN0)
Read/Write
7
6
5
4
3
2
1
0
M/A
CMP
SEL
RSL
SGE
UDC
RST
PAR
0
0
0
0
0
0
0
0
This register contains the interrupt mask bits that correspond to the
interrupting conditions described in the SCSI Interrupt Status Zero
(SIST0) register. An interrupt is masked by clearing the appropriate mask
bit. For more information on interrupts, see Chapter 2, “Functional
Description.”
5-48
Operating Registers
M/A
SCSI Phase Mismatch - Initiator Mode;
7
SCSI ATN Condition - Target Mode
In initiator mode, this bit controls whether an interrupt
occurs when the SCSI phase asserted by the target and
sampled during SREQ/ does not match the expected
phase in the SCSI Output Control Latch (SOCL) register.
This expected phase is automatically written by the SCSI
SCRIPTS program. In target mode, this bit is set when
the initiator has asserted SATN/. See the Disable Halt on
Parity Error or SATN/ Condition bit in the SCSI Control
One (SCNTL1) register for more information on when this
status is actually raised.
CMP
Function Complete
6
This bit controls whether an interrupt occurs when full
arbitration and selection sequence has completed.
SEL
Selected
5
This bit controls whether an interrupt occurs when the
LSI53C860 has been selected by a SCSI target device.
The Enable Response to Selection bit in the SCSI Chip
ID (SCID) register must be set for this to occur.
RSL
Reselected
4
This bit controls whether an interrupt occurs when the
LSI53C860 has been reselected by a SCSI initiator
device. The Enable Response to Reselection bit in the
SCSI Chip ID (SCID) register must be set for this to
occur.
SGE
SCSI Gross Error
3
This bit controls whether an interrupt occurs when the
LSI53C860 detects a SCSI Gross Error. The following
conditions are considered SCSI Gross Errors:
• Data underflow – the SCSI FIFO was read when no
data was present.
• Data overflow – the SCSI FIFO was written to while
full.
• Offset underflow – in target mode, a SACK/ pulse was
received before the corresponding SREQ/ was sent.
5-49
• Offset overflow – in initiator mode, an SREQ/ pulse
was received which caused the maximum offset
(defined by the MO[3:0] bits in the SCSI Transfer
(SXFER) register) to be exceeded.
• In initiator mode, a phase change occurred with an
outstanding SREQ/SACK offset.
• Residual data in SCSI FIFO – a transfer other than
synchronous data receive was started with data left in
the SCSI synchronous receive FIFO.
5-50
UDC
Unexpected Disconnect
2
This bit controls whether an interrupt occurs in the case
of an unexpected disconnect. This condition only occurs
in initiator mode. It happens when the target to which the
LSI53C860 is connected disconnects from the SCSI bus
unexpectedly. See the SCSI Disconnect Unexpected bit
in the SCSI Control Two (SCNTL2) register for more
information on expected versus unexpected disconnects.
Any disconnect in low level mode causes this condition.
RST
SCSI Reset Condition
1
This bit controls whether an interrupt occurs when the
SRST/ signal has been asserted by the LSI53C860 or
any other SCSI device. Note that this condition is
edge-triggered, so that multiple interrupts cannot occur
because of a single SRST/ pulse.
PAR
SCSI Parity Error
0
This bit controls whether an interrupt occurs when the
LSI53C860 detects a parity error while receiving or
sending SCSI data. See the Disable Halt on Parity Error
or SATN/ Condition bits in the SCSI Control One
(SCNTL1) register for more information on when this
condition will actually be raised.
Operating Registers
Register: 0x41 (0xC1)
SCSI Interrupt Enable One (SIEN1)
Read/Write
7
3
R
x
x
x
x
x
2
1
0
STO
GEN
HTH
0
0
0
This register contains the interrupt mask bits corresponding to the
interrupting conditions described in the SCSI Interrupt Status One
(SIST1) register. An interrupt is masked by clearing the appropriate mask
bit. For more information on interrupts, refer to Chapter 2, “Functional
Description.”
R
Reserved
[7:3]
STO
Selection or Reselection Time-out
2
This bit controls whether an interrupt occurs when the
SCSI device which the LSI53C860 was attempting to
select or reselect did not respond within the programmed
time-out period. See the description of the SCSI Timer
Zero (STIME0) register bits [3:0] for more information on
the time-out timer.
GEN
General Purpose Timer Expired
1
This bit controls whether an interrupt occurs when the
general purpose timer has expired. The time measured is
the time between enabling and disabling of the timer. See
the description of the SCSI Timer One (STIME1) register,
bits [3:0], for more information on the general purpose
timer.
HTH
Handshake to Handshake timer Expired
0
This bit controls whether an interrupt occurs when the
handshake-to-handshake timer has expired. The time
measured is the SCSI Request to Request (target) or
Acknowledge to Acknowledge (initiator) period. See the
description of the SCSI Timer Zero (STIME0) register,
bits [7:4], for more information on the handshake-tohandshake timer.
5-51
Register: 0x42 (0xC2)
SCSI Interrupt Status Zero (SIST0)
Read Only
7
6
5
4
3
2
1
0
M/A
CMP
SEL
RSL
SGE
UDC
RST
PAR
0
0
0
0
0
0
0
0
Reading the SCSI Interrupt Status Zero (SIST0) register returns the
status of the various interrupt conditions, whether or not they are enabled
in the SCSI Interrupt Enable Zero (SIEN0) register. Each bit set indicates
that the corresponding condition has occurred. Reading the SCSI
Interrupt Status Zero (SIST0) will clear the interrupt status.
Reading this register will clear any bits that are set at the time the
register is read, but will not necessarily clear the register because
additional interrupts may be pending (the LSI53C860 stacks interrupts).
SCSI interrupt conditions may be individually masked through the SCSI
Interrupt Enable Zero (SIEN0) register.
When performing consecutive 8-bit reads of the DMA Status (DSTAT),
SCSI Interrupt Status Zero (SIST0), and SCSI Interrupt Status One
(SIST1) registers (in any order), insert a delay equivalent to 12 CLK
periods between the reads to ensure the interrupts clear properly. Also,
if reading the registers when both the ISTAT SIP and DIP bits may not
be set, the SCSI Interrupt Status Zero (SIST0) and SCSI Interrupt Status
One (SIST1) registers should be read before the DMA Status (DSTAT)
register to avoid missing a SCSI interrupt. For more information on
interrupts, refer to Chapter 2, “Functional Description.”
5-52
M/A
Initiator Mode: Phase Mismatch;
7
Target Mode: SATN/ Active
In initiator mode, this bit is set if the SCSI phase asserted
by the target does not match the instruction. The phase
is sampled when SREQ/ is asserted by the target. In
target mode, this bit is set when the SATN/ signal is
asserted by the initiator.
CMP
Function Complete
6
This bit is set when an arbitration only or full arbitration
sequence has completed.
Operating Registers
SEL
Selected
5
This bit is set when the LSI53C860 is selected by another
SCSI device. The Enable Response to Selection bit must
have been set in the SCSI Chip ID (SCID) register (and
the Response ID (RESPID) register must hold the chip’s
ID) for the LSI53C860 to respond to selection attempts.
RSL
Reselected
4
This bit is set when the LSI53C860 is reselected by
another SCSI device. The Enable Response to
Reselection bit must have been set in the SCSI Chip ID
(SCID) register (and the Response ID (RESPID) register
must hold the chip’s ID) for the LSI53C860 to respond to
reselection attempts.
SGE
SCSI Gross Error
3
This bit is set when the LSI53C860 encounters a SCSI
Gross Error Condition. The following conditions can result
in a SCSI Gross Error Condition:
• Data Underflow – the SCSI FIFO register was read
when no data was present.
• Data Overflow – too many bytes were written to the
SCSI FIFO or the synchronous offset caused the
SCSI FIFO to be overwritten.
• Offset Underflow – the LSI53C860 is operating in
target mode and a SACK/ pulse is received when the
outstanding offset is zero.
• Offset Overflow – the other SCSI device sent a
SREQ/ or SACK/ pulse with data which exceeded the
maximum synchronous offset defined by the SCSI
Transfer (SXFER) register.
• A phase change occurred with an outstanding
synchronous offset when the LSI53C860 was
operating as an initiator.
• Residual data in the Synchronous data FIFO – a
transfer other than synchronous data receive was
started with data left in the synchronous data FIFO.
UDC
Unexpected Disconnect
2
This bit is set when the LSI53C860 is operating in initiator
mode and the target device unexpectedly disconnects
from the SCSI bus. This bit is only valid when the
5-53
LSI53C860 operates in the initiator mode. When the
LSI53C860 operates in low level mode, any disconnect
will cause an interrupt, even a valid SCSI disconnect.
This bit will also be set if a selection time-out occurs (it
may occur before, at the same time, or stacked after the
STO interrupt, since this is not considered an expected
disconnect).
RST
SCSI RST/ Received
1
This bit is set when the LSI53C860 detects an active
SRST/ signal, whether the reset was generated external
to the chip or caused by the Assert SRST/ bit in the SCSI
Control One (SCNTL1) register. This LSI53C860 SCSI
reset detection logic is edge-sensitive, so that multiple
interrupts will not be generated for a single assertion of
the SRST/ signal.
PAR
Parity Error
0
This bit is set when the LSI53C860 detects a parity error
while receiving SCSI data. The Enable Parity Checking
bit (bit 3 in the SCSI Control Zero (SCNTL0) register)
must be set for this bit to become active. The LSI53C860
always generates parity when sending SCSI data.
Register: 0x43 (0xC3)
SCSI Interrupt Status One (SIST1)
Read Only
7
3
R
x
x
x
x
x
2
1
0
STO
GEN
HTH
0
0
0
Reading the SCSI Interrupt Status One (SIST1) register returns the
status of the various interrupt conditions, whether or not they are enabled
in the SCSI Interrupt Enable One (SIEN1) register. Each bit that is set
indicates the corresponding condition has occurred.
Reading the SCSI Interrupt Status One (SIST1) register will clear the
interrupt condition.
5-54
Operating Registers
R
Reserved
[7:3]
STO
Selection or Reselection Time-out
2
This bit is set when the SCSI device which the
LSI53C860 was attempting to select or reselect did not
respond within the programmed time-out period. See the
description of the SCSI Timer Zero (STIME0) register,
bits [3:0], for more information on the time-out timer.
GEN
General Purpose Timer Expired
1
This bit is set when the general purpose timer has
expired. The time measured is the time between enabling
and disabling of the timer. See the description of the
SCSI Timer One (STIME1) register, bits [3:0], for more
information on the general purpose timer.
HTH
Handshake-to-Handshake Timer Expired
0
This bit is set when the handshake-to-handshake timer
has expired. The time measured is the SCSI Request to
Request (target) or Acknowledge to Acknowledge
(initiator) period. See the description of the SCSI Timer
Zero (STIME0) register, bits [7:4], for more information on
the handshake-to-handshake timer.
Register: 0x44 (0xC4)
SCSI Longitudinal Parity (SLPAR)
Read/Write
7
0
SLPAR
x
SLPAR
x
x
x
x
x
x
x
SCSI Longitudinal Parity
[7:0]
This register performs a bytewise longitudinal parity
check on all SCSI data received or sent through the SCSI
core. If one of the bytes received or sent (usually the last)
is the set of correct even parity bits, SCSI Longitudinal
Parity (SLPAR) should go to zero (assuming it started at
zero). As an example, suppose that the following three
data bytes and one check byte are received from the
SCSI bus (all signals are shown active HIGH):
5-55
Data Bytes
–
Running SLPAR
00000000
1. 11001100 11001100 (XOR of word 1)
2. 01010101 10011001 (XOR of word 1 and 2)
3. 00001111 10010110 (XOR of word 1, 2 and 3)
Even parity >>> 10010110
4. 10010110 00000000
A one in any bit position of the final SCSI Longitudinal
Parity (SLPAR) value would indicate a transmission error.
The SCSI Longitudinal Parity (SLPAR) register can also
be used to generate the check bytes for SCSI send
operations. If the SCSI Longitudinal Parity (SLPAR)
register contains all zeros prior to sending a block move,
it will contain the appropriate check byte at the end of the
block move. This byte must then be sent across the SCSI
bus.
Note:
Writing any value to this register resets it to zero.
The longitudinal parity checks are meant to provide an
added measure of SCSI data integrity and are entirely
optional. This register does not latch SCSI
selection/reselection IDs under any circumstances. The
default value of this register is zero.
5-56
Operating Registers
Register: 0x46 (0xC6)
Memory Access Control (MACNTL)
Read/Write
7
4
TYP[3:0]
0
TYP[3:0]
1
1
0
3
2
1
0
DWR
DRD
PSCPT
SCPTS
0
0
0
0
Chip Type
[7:4]
These bits identify the chip type for software purposes.
Bits 3 through 0 of this register are used to determine if
an external bus master access is to local or far memory.
When bits 3 through 0 are set, the corresponding access
is considered local and the MAC/_TESTOUT pin is driven
high. When these bits are clear, the corresponding
access is to far memory and the MAC/_TESTOUT pin is
driven low. This function is enabled after a Transfer
Control SCRIPTS instruction is executed.
DWR
DataWR
3
This bit is used to define if a data write is considered
local memory access.
DRD
DataRD
2
This bit is used to define if a data read is considered local
memory access.
PSCPT
Pointer SCRIPTS
1
This bit is used to define if a pointer to a SCRIPTS
indirect or table indirect fetch is considered local memory
access.
SCPTS
SCRIPTS
This bit is used to define if a SCRIPTS fetch is
considered local memory access.
0
5-57
Register: 0x47 (0xC7)
General Purpose Pin Control (GPCNTL)
Read/Write
7
6
ME
FE
0
0
5
2
1
R
x
0
0
GPIO[1:0]
1
1
1
1
This register is used to determine if the pins controlled by the General
Purpose (GPREG) register are inputs or outputs. Bits [1:0] in General
Purpose Pin Control (GPCNTL) correspond to bits [1:0] in the General
Purpose (GPREG) register. When the bits are enabled as inputs, an
internal pull-up is also enabled.
5-58
ME
Master Enable
7
The internal bus master signal will be presented on
GPIO1 if this bit is set, regardless of the state of Bit 1
(GPIO1_EN).
FE
Fetch Enable
6
The internal opcode fetch signal will be presented on
GPIO0 if this bit is set, regardless of the state of Bit 0
(GPIO0_EN).
R
Reserved
GPIO[1:0]
GPIO Enable
[1:0]
These bits power-up set, causing the GPIO1 and GPIO0
pins to become inputs. Resetting these bits causes
GPIO[1:0] to become outputs.
Operating Registers
[5:2]
Register: 0x48 (0xC8)
SCSI Timer Zero (STIME0)
Read/Write
7
4
3
0
HTH[3:0]
0
HTH
0
SEL[3:0]
0
0
0
0
0
0
Handshake-to-Handshake Timer Period
[7:4]
These bits select the handshake-to-handshake time-out
period, the maximum time between SCSI handshakes
(SREQ/ to SREQ/ in target mode, or SACK/ to SACK/ in
initiator mode). When this timing is exceeded, an interrupt
is generated and the HTH bit in the SCSI Interrupt Status
One (SIST1) register is set. The following table contains
time-out periods for the Handshake-to-Handshake Timer,
the Selection/Reselection Timer (bits [3:0]), and the
General Purpose Timer (SCSI Timer One (STIME1) bits
[3:0]). For a more detailed explanation of interrupts, refer
to Chapter 2, “Functional Description.”
5-59
HTH[7:4],
SEL[3:0],
GEN[3:0]1
Minimum Timeout
(40 MHz)
Minimum Timeout
(50 MHz)
0000
Disabled
Disabled
0001
125 µs
100 µs
0010
250 µs
200 µs
0011
500 µs
400 µs
0100
1 ms
800 µs
0101
2 ms
1.6 ms
0110
4 ms
3.2 ms
0111
8 ms
6.4 ms
1000
16 ms
12.8 ms
1001
32 ms
25.6 ms
1010
64 ms
51.2 ms
1011
128 ms
102.4 ms
1100
256 ms
204.8 ms
1101
512 ms
409.6 ms
1110
1.024 s
819.2 ms
1111
2.048 s
1.6384 s
1. These values are correct if the CCF bits in the SCSI Control
Three (SCNTL3) register are set according to the valid
combinations in the bit description.
SEL
5-60
Selection Time-Out
[3:0]
These bits select the SCSI selection/reselection time-out
period. When this timing (plus the 200 µs selection abort
time) is exceeded, the STO bit in the SCSI Interrupt Status One (SIST1) register is set. For a more detailed
explanation of interrupts, refer to Chapter 2, “Functional
Description.”
Operating Registers
Register: 0x49 (0xC9)
SCSI Timer One (STIME1)
Read/Write
7
4
3
0
R
x
x
R
GEN[3:0]
x
x
0
0
0
Reserved
0
[7:4]
GEN[3:0]
General Purpose Timer Period
[3:0]
These bits select the period of the general purpose timer.
The time measured is the time between enabling and
disabling of the timer. When this timing is exceeded, the
GEN bit in the SCSI Interrupt Status One (SIST1) register
is set. Refer to the table under SCSI Timer Zero
(STIME0), bits [3:0], for the available time-out periods.
Note:
To reset a timer before it has expired and to obtain
repeatable delays, the time value must be written to zero
first, and then written back to the desired value. This is also
required when changing from one time value to another.
Chapter 2, “Functional Description,” for an explanation of
how interrupts are generated when the timers expire.
Register: 0x4A (0xCA)
Response ID (RESPID)
Read/Write
7
0
ID
x
RESPID
x
x
x
x
x
x
x
Response ID
[7:0]
This register contains the IDs that the chip responds to
on the SCSI bus. Each bit represents one possible ID
with the most significant bit representing ID 7 and the
least significant bit representing ID 0. The SCSI Chip ID
(SCID) register still contains the chip ID used during
arbitration. The chip can respond to more than one ID
because more than one bit can be set in the Response
5-61
ID (RESPID) register. However, the chip can arbitrate
with only one ID value in the SCSI Chip ID (SCID)
register.
Register: 0x4C (0xCC)
SCSI Test Zero (STEST0)
Read Only
7
6
4
R
x
5-62
SSAID
x
x
x
3
2
1
0
SLT
ART
SOZ
SOM
0
x
1
1
R
Reserved
SSAID
SCSI Selected As ID
[6:4]
These bits contain the encoded value of the SCSI ID that
the LSI53C860 was selected or reselected as during a
SCSI selection or reselection phase. These bits are read
only and contain the encoded value of 0–7 possible IDs
that could be used to select the LSI53C860. During a
SCSI selection or reselection phase when a valid ID has
been put on the bus, and the LSI53C860 responds to that
ID, the “selected as” ID is written into these bits.
SLT
Selection Response Logic Test
3
This bit is set when the LSI53C860 is ready to be
selected or reselected. This does not take into account
the bus settle delay of 400 ns. This bit is used for
functional test and fault purposes.
ART
Arbitration Priority Encoder Test
2
This bit will always be set when the LSI53C860 exhibits
the highest priority ID asserted on the SCSI bus during
arbitration. It is primarily used for chip level testing, but it
may be used during low level mode operation to
determine if the LSI53C860 has won arbitration.
SOZ
SCSI Synchronous Offset Zero
1
This bit indicates that the current synchronous
SREQ/SACK offset is zero. This bit is not latched and
may change at any time. It is used in low level
synchronous SCSI operations. When this bit is set, the
Operating Registers
7
LSI53C860, as an initiator, is waiting for the target to
request data transfers. If the LSI53C860 is a target, then
the initiator has sent the offset number of acknowledges.
SOM
SCSI Synchronous Offset Maximum
0
This bit indicates that the current synchronous
SREQ/SACK offset is the maximum specified by bits [3:0]
in the SCSI Transfer register. This bit is not latched and
may change at any time. It is used in low level
synchronous SCSI operations. When this bit is set, the
LSI53C860, as a target, is waiting for the initiator to
acknowledge the data transfers. If the LSI53C860 is an
initiator, then the target has sent the offset number of
requests.
Register: 0x4D (0xCD)
SCSI Test One (STEST1)
Read/Write
7
6
5
SCLK
SISO
0
0
0
R
x
x
x
x
x
x
SCLK
SCSI Clock
7
This bit, when set, disables the external SCLK (SCSI
Clock) pin, and causes the chip to use the PCI clock as
the internal SCSI clock. If a transfer rate of 10 Mbytes/s
is to be achieved on the SCSI bus, this bit must be
cleared and the chip must be connected to at least a
40 MHz external SCLK. To achieve Ultra SCSI
synchronous transfer rates, this bit must be cleared and
the chip must be connected to an 80 MHz external SCLK.
SISO
SCSI Isolation Mode
6
This bit allows the LSI53C860 to put the SCSI
bidirectional and input pins into a low power mode when
the SCSI bus is not in use. When this bit is set, the SCSI
bus inputs are logically isolated from the SCSI bus.
R
Reserved
[5:0]
5-63
Register: 0x4E (0xCE)
SCSI Test Two (STEST2)
Read/Write
7
6
5
4
3
2
1
0
SCE
ROF
R
SLB
SZM
R
EXT
LOW
0
0
x
0
0
x
0
0
SCE
SCSI Control Enable
7
This bit, when set, allows all SCSI control and data lines
to be asserted through the SCSI Output Control Latch
(SOCL) and SCSI Output Data Latch (SODL) registers
regardless of whether the LSI53C860 is configured as a
target or initiator.
Note:
5-64
This bit should not be set during normal operation, since it
could cause contention on the SCSI bus. It is included for
diagnostic purposes only.
ROF
Reset SCSI Offset
6
Setting this bit clears any outstanding synchronous
SREQ/SACK offset. This bit should be set if a SCSI gross
error condition occurs, to clear the offset when a
synchronous transfer does not complete successfully.
The bit automatically clears itself after resetting the
synchronous offset.
R
Reserved
SLB
SCSI Loopback Mode
4
Setting this bit allows the LSI53C860 to perform SCSI
loopback diagnostics. That is, it enables the SCSI core to
simultaneously perform as both initiator and target.
SZM
SCSI High Impedance Mode
3
Setting this bit places all the open-drain 48 mA SCSI
drivers into a high impedance state. This is to allow
internal loopback mode operation without affecting the
SCSI bus.
R
Reserved
EXT
Extend SREQ/SACK filtering
1
LSI Logic TolerANT SCSI receiver technology includes a
special digital filter on the SREQ/ and SACK/ pins which
Operating Registers
5
2
will cause glitches on deasserting edges to be
disregarded. Setting this bit will increase the filtering
period from 30 ns to 60 ns on the deasserting edge of
the SREQ/ and SACK/ signals.
Note:
This bit must never be set during fast SCSI (greater than
5 M transfers per second) operations, because a valid
assertion could be treated as a glitch.
This bit does not affect the filtering period when the
Fast-20 Enable bit in the SCSI Control Three (SCNTL3)
register is set. When the LSI53C860 is executing Ultra
SCSI transfers, the filtering period is automatically set at
15 ns.
LOW
Note:
SCSI Low level Mode
0
Setting this bit places the LSI53C860 in low level mode.
In this mode, no DMA operations occur, and no SCRIPTS
execute. Arbitration and selection may be performed by
setting the start sequence bit as described in the SCSI
Control Zero (SCNTL0) register. SCSI bus transfers are
performed by manually asserting and polling SCSI
signals. Clearing this bit allows instructions to be
executed in SCSI SCRIPTS mode.
It is not necessary to set this bit for access to the SCSI
bit-level registers (SCSI Output Data Latch (SODL), SCSI
Bus Control Lines (SBCL), and input registers).
Register: 0x4F (0xCF)
SCSI Test Three (STEST3)
Read/Write
TE
7
6
5
4
3
2
1
0
TE
STR
HSC
DSI
R
TTM
CSF
STW
0
0
0
0
x
0
0
0
TolerANT Enable
7
Setting this bit enables the active negation portion of
TolerANT technology. Active negation causes the SCSI
Request, Acknowledge, Data, and Parity signals to be
actively deasserted, instead of relying on external
pull-ups, when the LSI53C860 is driving these signals.
5-65
Active deassertion of these signals will occur only when
the LSI53C860 is in an information transfer phase.
TolerANT active negation should be enabled to improve
setup and deassertion times at fast SCSI timings. Active
negation is disabled after reset or when this bit is cleared.
For more information on TolerANT technology, refer to
Chapter 1, “General Description.”
Note:
5-66
This bit must be set if the Enable Fast 20 bit in SCSI Control Three (SCNTL3) is set.
STR
SCSI FIFO Test Read
6
Setting this bit places the SCSI core into a test mode in
which the SCSI FIFO can be easily read. Reading the
SCSI Output Data Latch (SODL) register will cause the
FIFO to unload.
HSC
Halt SCSI Clock
5
Asserting this bit causes the internal divided SCSI clock
to come to a stop in a glitchless manner. This bit may be
used for test purposes or to lower IDD during a power
down mode.
DSI
Disable Single Initiator Response
4
If this bit is set, the LSI53C860 will ignore all bus-initiated
selection attempts that employ the single-initiator option
from SCSI-1. In order to select the LSI53C860 while this
bit is set, the LSI53C860’s SCSI ID and the initiator’s
SCSI ID must both be asserted. This bit should be
asserted in SCSI-2 systems so that a single bit error on
the SCSI bus will not be interpreted as a single initiator
response.
R
Reserved
TTM
Timer Test Mode
2
Setting this bit facilitates testing of the selection time-out,
general purpose, and handshake-to-handshake timers by
greatly reducing all three time-out periods. Setting this bit
starts all three timers and, if the respective bits in the
SCSI Interrupt Enable One (SIEN1) register are set,
causes the LSI53C860 to generate interrupts at time-out.
This bit is intended for internal manufacturing diagnosis
and should not be used.
Operating Registers
3
CSF
Clear SCSI FIFO
1
Setting this bit will cause the “full flags” for the SCSI FIFO
to be cleared. This empties the FIFO. This bit is
self-clearing. In addition, the SCSI FIFO pointers, the
SCSI Input Data Latch (SIDL), SCSI Output Data Latch
(SODL), and SODR Full bits in the SCSI Status Zero
(SSTAT0) register are cleared.
STW
SCSI FIFO Test Write
0
Setting this bit places the SCSI core into a test mode in
which the FIFO can easily be written. While this bit is set,
writes to the SCSI Output Data Latch (SODL) register will
cause the entire word contained in this register to be
loaded into the FIFO. Writing the least significant byte of
the SCSI Output Data Latch (SODL) register will cause
the FIFO to load.
Register: 0x50 (0xD0)
SCSI Input Data Latch (SIDL)
Read Only
15
0
SIDL
x
SIDL
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
SCSI Input Data Latch
[15:0]
This register is used primarily for diagnostic testing,
programmed I/O operation or error recovery. Data
received from the SCSI bus can be read from this
register. Data can be written to the SCSI Output Data
Latch (SODL) register and then read back into the
LSI53C860 by reading this register to allow loopback
testing. When receiving SCSI data, the data will flow into
this register and out to the host FIFO. This register differs
from the SCSI Bus Data Lines (SBDL) register; SIDL
contains latched data and the SBDL always contains
exactly what is currently on the SCSI data bus. Reading
this register causes the SCSI parity bit to be checked,
and will cause a parity error interrupt if the data is not
valid. The power-up values are indeterminate.
5-67
Register: 0x54 (0xD4)
SCSI Output Data Latch (SODL)
Read/Write
15
0
SODL
x
x
x
x
SODL
x
x
x
x
x
x
x
x
x
x
x
x
SCSI Output Data Latch
[15:0]
This register is used primarily for diagnostic testing or
programmed I/O operation. Data written to this register is
asserted onto the SCSI data bus by setting the Assert
Data Bus bit in the SCSI Control One (SCNTL1) register.
This register is used to send data using programmed I/O.
Data flows through this register when sending data in any
mode. It is also used to write to the synchronous data
FIFO when testing the chip. The power-up value of this
register is indeterminate.
Register: 0x58 (0xD8)
SCSI Bus Data Lines (SBDL)
Read Only
15
0
SBDL
x
x
SBDL
5-68
x
x
x
x
x
x
x
x
x
x
x
x
x
x
SCSI Bus Data Lines
[15:0]
This register contains the SCSI data bus status. Even
though the SCSI data bus is active low, these bits are
active high. The signal status is not latched and is a true
representation of exactly what is on the data bus at the
time the register is read. This register is used when
receiving data using programmed I/O. This register can
also be used for diagnostic testing or in low level mode.
The power-up value of this register is indeterminate.
Operating Registers
Register: 0x5C–0x5F (0xDC–0xDF)
Scratch Register B (SCRATCHB)
Read/Write
31
0
SCRATCHB
x
x
x
x
x
x
x
x
x
x
x
SCRATCHB
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Scratch Register B
[31:0]
This is a general purpose user definable scratch pad
register. Apart from CPU access, only Register
Read/Write and Memory Moves directed at the
SCRATCH register will alter its contents. The power-up
values are indeterminate.
The LSI53C860 cannot fetch SCRIPTS instructions from
this location.
5-69
5-70
Operating Registers
Chapter 6
Instruction Set of the
I/O Processor
This chapter is divided into the following sections:
•
Section 6.1, “Low Level Register Interface Mode”
•
Section 6.2, “SCSI SCRIPTS”
•
Section 6.3, “Block Move Instructions”
•
Section 6.4, “I/O Instructions”
•
Section 6.5, “Read/Write Instructions”
•
Section 6.6, “Transfer Control Instructions”
•
Section 6.7, “Memory Move Instructions”
•
Section 6.8, “Load and Store Instructions”
After power-up and initialization of the LSI53C860, the chip can operate
in the low level register interface mode, or use SCSI SCRIPTS.
6.1 Low Level Register Interface Mode
With the low level register interface, the user has access to the DMA
control logic and the SCSI bus control logic. An external processor has
access to the SCSI bus signals and the low level DMA signals, which
allows creation of complicated board level test algorithms. The low level
interface is useful for backward compatibility with SCSI devices that
require certain unique timings or bus sequences to operate properly.
Another feature allowed at the low level is loopback testing. In loopback
mode, the SCSI core can be directed to talk to the DMA core to test
internal data paths all the way out to the chip’s pins.
LSI53C860 PCI to Ultra SCSI I/O Processor
6-1
6.2 SCSI SCRIPTS
To operate in the SCSI SCRIPTS mode, the LSI53C860 requires only a
SCRIPTS start address. The start address must be at a Dword (four
byte) boundary. This aligns the following SCRIPTS at a Dword boundary,
since all SCRIPTS are 8 or 12 bytes long. All instructions are fetched
from external memory. The LSI53C860 fetches and executes its own
instructions by becoming a bus master on the host bus and fetching two
or three 32-bit words into its registers. Instructions are fetched until an
interrupt instruction is encountered, or until an unexpected event (such
as a hardware error) causes an interrupt to the external processor.
Once an interrupt is generated, the LSI53C860 halts all operations until
the interrupt is serviced. Then, the start address of the next SCRIPTS
instruction may be written to the DMA SCRIPTS Pointer (DSP) register
to restart the automatic fetching and execution of instructions.
The SCSI SCRIPTS mode of execution allows the LSI53C860 to make
decisions based on the status of the SCSI bus, so that the
microprocessor does not have to service all of the interrupts inherent in
I/O operations.
Given the rich set of SCSI oriented features included in the instruction
set, and the ability to re-enter the SCSI algorithm at any point, this high
level interface is all that is required for both normal and exception
conditions. There is no need to switch to low level mode for error
recovery.
The following types of SCRIPTS instructions are implemented in the
LSI53C860 as shown in Table 6.1:
6-2
Instruction Set of the I/O Processor
Table 6.1
SCRIPTS Instructions
Instruction
Description
Block Move
Block Move instruction moves data between the SCSI
bus and memory.
I/O or Read/Write
I/O or Read/Write instructions cause the LSI53C860 to
trigger common SCSI hardware sequences, or to move
registers.
Transfer Control
Transfer Control instruction allows SCRIPTS instructions
to make decisions based on real time SCSI bus
conditions.
Memory Move
Memory Move instruction causes the LSI53C860 to
execute block moves between different parts of main
memory.
Load and Store
Load and Store instructions provide a more efficient way
to move data to/from memory from/to an internal register
in the chip without using the Memory Move instruction.
Each instruction consists of two or three 32-bit words. The first 32-bit
word is always loaded into the DMA Command (DCMD) and DMA Byte
Counter (DBC) registers, the second into the DMA SCRIPTS Pointer
Save (DSPS) register. The third word, used only by Memory Move
instructions, is loaded into the Temporary (TEMP) shadow register. In an
indirect I/O or Move instruction, the first two 32-bit opcode fetches will be
followed by one or two more 32-bit fetch cycles.
6.2.1 Sample Operation
The following example describes execution of a SCRIPTS instruction.
This sample operation is for a Block Move instruction. Figure 6.1
illustrates a SCRIPTS Initiator Write operation, which uses several Block
Move instructions.
•
The host CPU, through programmed I/O, gives the DMA SCRIPTS
Pointer (DSP) register (in the Operating Register file) the starting
address in main memory that points to a SCSI SCRIPTS program
for execution.
SCSI SCRIPTS
6-3
•
Loading the DMA SCRIPTS Pointer (DSP) register causes the
LSI53C860 to request use of the PCI bus to fetch its first instruction
from main memory at the address just loaded.
•
The LSI53C860 typically fetches two Dwords (64 bits) and decodes
the high order byte of the first Dword as a SCRIPTS instruction. If
the instruction is a Block Move, the lower three bytes of the first
Dword are stored and interpreted as the number of bytes to be
moved. The second Dword is stored and interpreted as the 32-bit
beginning address in main memory to which the move is directed.
•
For a SCSI send operation, the LSI53C860 waits until there is
enough space in the DMA FIFO to transfer a programmable size
block of data. For a SCSI receive operation, it waits until enough data
is collected in the DMA FIFO for transfer to memory.
•
LSI53C860 requests use of the PCI bus again, this time for data
transfers.
•
When the LSI53C860 is again granted the PCI bus, it will execute
(as a bus master) a burst transfer (programmable size) of data,
decrement the internally stored remaining byte count, increment the
address pointer, and then release the PCI bus. The LSI53C860 stays
off the PCI bus until the FIFO can again hold (for a write) or has
collected (for a read) enough data to repeat the process.
The process repeats until the internally stored byte count has reached
zero. The LSI53C860 releases the PCI bus and then requests use of the
PCI bus again for another SCRIPTS instruction fetch cycle, using the
incremented stored address maintained in the DMA SCRIPTS Pointer
(DSP) register. Execution of SCRIPTS instructions continues until an
error condition occurs or an interrupt SCRIPTS instruction is received. At
this point, the LSI53C860 interrupts the host CPU and waits for further
servicing by the host system. It can execute independent Block Move
instructions, specifying new byte counts and starting locations in main
memory. In this manner, the LSI53C860 performs scatter/gather
operations on data without requiring help from the host program,
generating a host interrupt, or requiring an external DMA controller to be
programmed. Figure 6.1 illustrates a SCRIPTS Initiator Write operation,
which uses several Block Move instructions.
6-4
Instruction Set of the I/O Processor
Figure 6.1
SCRIPTS Overview
System Processor
Write DSP
System Memory
SCSI Initiator Write Example
×
×
×
×
×
×
×
×
×
×
Select ATN 0, alt_addr
Move from identify_msg_buf, when MSG_OUT
Move from cmd_buf, when CMD
Move from data_buf when DATA_OUT
Move from stat_in_buf, when STATUS
Move from msg_in_buf, when MSG_IN
Move SCNTL2 & 7F to SCNTL2
Clear ACK
Wail disconnect alt2
Int 10
S
Y
S
T
E
M
B
Fetch
U SCRIPTS
S
LSI53C860
SCSI Bus
Data Structure
Message Buffer
Command Buffer
Data Buffer
Status Buffer
Data
6.3 Block Move Instructions
The Block Move SCRIPTS instruction is used to move data between the
SCSI bus and memory. For a Block Move instruction, the LSI53C860
operates much like a chaining DMA device with a SCSI controller
attached. Figure 6.2 illustrates the register bit values that represent a
Block Move instruction. In Block Move instructions, bits 5 and 4 (SIOM
and DIOM) in the DMA Mode (DMODE) register determine whether the
source/destination address resides in memory or I/O space. When data
is being moved onto the SCSI bus, SIOM controls whether that data
comes from I/O or memory space. When data is being moved off of the
SCSI bus, DIOM controls whether that data goes to I/O or memory
space.
Block Move Instructions
6-5
6.3.1 First Dword
IT[1:0]
Instruction Type-Block Move
[31:30]
IA
Indirect Addressing
29
When this bit is cleared, user data is moved to or from
the 32-bit data start address for the Block Move
instruction. The value is loaded into the chip’s address
register and incremented as data is transferred. The
address of data to be moved is in the second Dword of
this instruction.
When set, the 32-bit user data start address for the Block
Move is the address of a pointer to the actual data buffer
address. The value at the 32-bit start address is loaded
into the chip’s DMA Next Address (DNAD) register using
a third Dword fetch (4-byte transfer across the host
computer bus).
Direct Addressing
The byte count and absolute address are:
Command
Byte Count
Address of Data
Indirect Addressing
Use the fetched byte count, but fetch the data address
from the address in the instruction.
Command
Byte Count
Address of Pointer to Data
Once the data pointer address is loaded, it is executed
as when the chip operates in the direct mode. This
indirect feature allows a table of data buffer addresses to
be specified. Using the SCSI SCRIPTS assembler, the
table offset is placed in the SCRIPTS file when the
program is assembled. Then at the actual data transfer
time, the offsets are added to the base address of the
data address table by the external processor. The logical
I/O driver builds a structure of addresses for an I/O rather
than treating each address individually. This feature
makes it possible to locate SCSI SCRIPTS in a PROM.
6-6
Instruction Set of the I/O Processor
Note:
TIA
Indirect and table indirect addressing cannot be used
simultaneously; only one addressing method can be used
at a time.
Table Indirect
28
When this bit is set, the 24-bit signed value in the start
address of the move is treated as a relative displacement
from the value in the Data Structure Address (DSA)
register. Both the transfer count and the
source/destination address are fetched from this address.
Use the signed integer offset in bits [23:0] of the second
four bytes of the instruction, added to the value in the
Data Structure Address (DSA) register, to fetch first the
byte count and then the data address. The signed value
is combined with the data structure base address to
generate the physical address used to fetch values from
the data structure. Sign-extended values of all ones for
negative values are allowed, but bits [31:24] are ignored.
Command
Not Used
Don’t Care
Table Offset
Block Move Instructions
6-7
Figure 6.2
Block Move Instruction Register
DCMD Register
DBC Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
5 4 3 2 1 0
I/O
C/D
24-bit Block Move Byte Counter
MSG/
Opcode
Table Indirect Addressing
Indirect Addressing (LSI53C700 Family Compatible)
0 - Instruction Type - Block Move
0 - Instruction Type - Block Move
DSPS Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
7 6
5 4 3 2 1 0
Prior to the start of an I/O, the Data Structure Address
(DSA) register should be loaded with the base address of
the I/O data structure. The address may be any address
on a Dword boundary.
After a Table Indirect opcode is fetched, the DSA is
added to the 24-bit signed offset value from the opcode
to generate the address of the required data; both
positive and negative offsets are allowed. A subsequent
fetch from that address brings the data values into the
chip.
For a MOVE instruction, the 24-bit byte count is fetched
from system memory. Then the 32-bit physical address is
brought into the LSI53C860. Execution of the move
begins at this point.
6-8
Instruction Set of the I/O Processor
SCRIPTS can directly execute operating system I/O data
structures, saving time at the beginning of an I/O
operation. The I/O data structure can begin on any Dword
boundary and may cross system segment boundaries.
There are two restrictions on the placement of pointer
data in system memory:
• the eight bytes of data in the MOVE instruction must
be contiguous, as shown below; and
• indirect data fetches are not available during
execution of a Memory-to-Memory DMA operation.
00
Byte Count
Physical Data Address
OpCode
27
This 1-bit field defines the instruction to be executed as
a block move (MOVE).
Target Mode
OPC
Instruction Defined
0
MOVE
1
Reserved
These instructions perform the following steps:
1. The LSI53C860 verifies that it is connected to the
SCSI bus as a Target before executing this instruction.
2. The LSI53C860 asserts the SCSI phase signals
(SMSG/, SC_D/, and SI_O/) as defined by the Phase
Field bits in the instruction.
3. If the instruction is for the command phase, the
LSI53C860 receives the first command byte and
decodes its SCSI Group Code.
– If the SCSI Group Code is either Group 0, Group 1,
Group 2, or Group 5, then the LSI53C860
overwrites the DMA Byte Counter (DBC) register
with the length of the Command Descriptor Block:
6, 10, or 12 bytes.
Block Move Instructions
6-9
– If any other Group Code is received, the DMA Byte
Counter (DBC) register is not modified and the
LSI53C860 will request the number of bytes
specified in the DMA Byte Counter (DBC) register.
If the DMA Byte Counter (DBC) register contains
0x000000, an illegal instruction interrupt is
generated.
4. The LSI53C860 transfers the number of bytes
specified in the DMA Byte Counter (DBC) register
starting at the address specified in the DMA Next
Address (DNAD) register.
5. If the SATN/ signal is asserted by the Initiator or a
parity error occurred during the transfer, the transfer
can optionally be halted and an interrupt generated.
The Disable Halt on Parity Error or ATN bit in the
SCSI Control One (SCNTL1) register controls
whether the LSI53C860 halts on these conditions
immediately, or waits until completion of the current
Move.
Initiator Mode
OPC
Instruction Defined
0
Reserved
1
MOVE
These instructions perform the following steps:
1. The LSI53C860 verifies that it is connected to the
SCSI bus as an Initiator before executing this
instruction.
2. The LSI53C860 waits for an unserviced phase to
occur. An unserviced phase is any phase (with SREQ/
asserted) for which the LSI53C860 has not yet
transferred data by responding with a SACK/.
6-10
Instruction Set of the I/O Processor
3. The LSI53C860 compares the SCSI phase bits in the
DMA Command (DCMD) register with the latched
SCSI phase lines stored in the SCSI Status One
(SSTAT1) register. These phase lines are latched
when SREQ/ is asserted.
4. If the SCSI phase bits match the value stored in the
SCSI SCSI Status One (SSTAT1) register, the
LSI53C860 transfers the number of bytes specified in
the DMA Byte Counter (DBC) register starting at the
address pointed to by the DMA Next Address (DNAD)
register.
5. If the SCSI phase bits do not match the value stored
in the SCSI Status One (SSTAT1) register, the
LSI53C860 generates a phase mismatch interrupt
and the instruction is not executed.
6. During a Message-Out phase, after the LSI53C860
has performed a select with Attention (or SATN/ is
manually asserted with a Set ATN instruction), the
LSI53C860 deasserts SATN/ during the final
SREQ/SACK/ handshake of the first move of
Message-Out bytes after SATN/ was set.
7. When the LSI53C860 is performing a block move for
Message-In phase, it does not deassert the SACK/
signal for the last SREQ/SACK/ handshake. Clear the
SACK/ signal using the Clear SACK I/O instruction.
SCSIP[2:0]
SCSI Phase
[26:24]
This 3-bit field defines the desired SCSI information
transfer phase. When the LSI53C860 operates in initiator
mode, these bits are compared with the latched SCSI
phase bits in the SCSI Status One (SSTAT1) register.
When the LSI53C860 operates in target mode, the
LSI53C860 asserts the phase defined in this field. The
following table describes the possible combinations and
the corresponding SCSI phase.
Block Move Instructions
6-11
MSG C_D
TC[23:0]
I_O
SCSI Phase
0
0
0
Data-Out
0
0
1
Data-In
0
1
0
Command
0
1
1
Status
1
0
0
Reserved-Out
1
0
1
Reserved-In
1
1
0
Message-Out
1
1
1
Message-In
Transfer Counter
[23:0]
This 24-bit field specifies the number of data bytes to be
moved between the LSI53C860 and system memory. The
field is stored in the DMA Byte Counter (DBC) register.
When the LSI53C860 transfers data to/from memory, the
DMA Byte Counter (DBC) register is decremented by the
number of bytes transferred. In addition, the DMA Next
Address (DNAD) register is incremented by the number
of bytes transferred. This process is repeated until the
DMA Byte Counter (DBC) register has been decremented to zero. At that time, the LSI53C860 fetches the
next instruction.
If bit 28 is set, indicating table indirect addressing, this
field is not used. The byte count is instead fetched from
a table pointed to by the Data Structure Address (DSA)
register.
6.3.2 Second Dword
Start Address
[31:0]
This 32-bit field specifies the starting address of the data
to be moved to/from memory. This field is copied to the
DMA Next Address (DNAD) register. When the
LSI53C860 transfers data to or from memory, the DMA
Next Address (DNAD) register is incremented by the
number of bytes transferred.
When bit 29 is set, indicating indirect addressing, this
address is a pointer to an address in memory that points
to the data location. When bit 28 is set, indicating table
6-12
Instruction Set of the I/O Processor
indirect addressing, the value in this field is an offset into
a table pointed to by the DSA. The table entry contains
byte count and address information.
6.4 I/O Instructions
The I/O SCRIPTS instruction causes the LSI53C860 to trigger common
SCSI hardware sequences such as Set/Clear ACK, Set/Clear ATN,
Set/Clear Target Mode, Select With ATN, or Wait for Reselect.
6.4.1 First Dword
IT[1:0]
Instruction Type - I/O Instruction
OPC[2:0]
OpCode
[29:27]
The following OpCode bits have different meanings,
depending on whether the LSI53C860 is operating in
initiator or target mode.
Note:
[31:30]
OpCode selections 101–111 are considered Read/Write
instructions, and are described in that section.
Target Mode
OPC2 OPC1 OPC0
Instruction Defined
0
0
0
Reselect
0
0
1
Disconnect
0
1
0
Wait Select
0
1
1
Set
1
0
0
Clear
Reselect Instruction
1. The LSI53C860 arbitrates for the SCSI bus by
asserting the SCSI ID stored in the SCSI Chip ID
(SCID) register. If it loses arbitration, it tries again
during the next available arbitration cycle without
reporting any lost arbitration status.
2. If the LSI53C860 wins arbitration, it attempts to
reselect the SCSI device whose ID is defined in the
destination ID field of the instruction. Once the
I/O Instructions
6-13
LSI53C860 wins arbitration, it fetches the next
instruction from the address pointed to by the DMA
SCRIPTS Pointer (DSP) register. This way the
SCRIPTS can move on to the next instruction before
the reselection completes. It continues executing
SCRIPTS until a SCRIPT that requires a response
from the Initiator is encountered.
3. If the LSI53C860 is selected or reselected before
winning arbitration, it fetches the next instruction from
the address pointed to by the 32-bit jump address
field stored in the DMA Next Address (DNAD) register.
Manually set the LSI53C860 to Initiator mode if it is
reselected, or to Target mode if it is selected.
Disconnect Instruction
The LSI53C860 disconnects from the SCSI bus by
deasserting all SCSI signal outputs.
Wait Select Instruction
1. If the LSI53C860 is selected, it fetches the next
instruction from the address pointed to by the DMA
SCRIPTS Pointer (DSP) register.
2. If reselected, the LSI53C860 fetches the next
instruction from the address pointed to by the 32-bit
jump address field stored in the DMA Next Address
(DNAD) register. Manually set the LSI53C860 to
Initiator mode when it is reselected.
3. If the CPU sets the SIGP bit in the SCSI Status Zero
(SSTAT0) register, the LSI53C860 aborts the Wait
Select instruction and fetches the next instruction from
the address pointed to by the 32-bit jump address
field stored in the DMA Next Address (DNAD) register.
Set Instruction
When the SACK/ or SATN/ bits are set, the
corresponding bits in the SCSI Output Control Latch
(SOCL) register are set. SACK/ or SATN/ should not be
set except for testing purposes. When the target bit is set,
the corresponding bit in the SCSI Control Zero (SCNTL0)
6-14
Instruction Set of the I/O Processor
register is also set. When the carry bit is set, the
corresponding bit in the Arithmetic Logic Unit (ALU) is
set.
Note:
None of the signals are set on the SCSI bus in target mode.
Figure 6.3 illustrates the register bit values that represent an I/O
instruction.
I/O Instructions
6-15
Figure 6.3
I/O Instruction Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
R
R
5 4 3 2 1 0
R
R
Set/Clear ATN/
Set/Clear ACK/
Set/Clear Target Mode
Set/Clear Carry
Encoded Destination ID 0
Encoded Destination ID 1
Encoded Destination ID 2
Reserved
Reserved
Reserved
Reserved
Reserved
Select with ATN/
Table Indirect Mode
Relative Address Mode
Opcode Bit 0
Opcode Bit 1
Opcode Bit 2
1 - Instruction Type - I/O
0 - Instruction Type - I/O
Second 32-bit Word of the I/O Instruction
DSPS Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
32-bit Jump Address
6-16
Instruction Set of the I/O Processor
5 4 3 2 1 0
Clear Instruction
When the SACK/ or SATN/ bits are set, the
corresponding bits are cleared in the SCSI Output Control Latch (SOCL) register. SACK/ or SATN/ should not be
set except for testing purposes. When the target bit is set,
the corresponding bit in the SCSI Control Zero (SCNTL0)
register is cleared. When the carry bit is set, the
corresponding bit in the ALU is cleared.
Note:
None of the signals are reset on the SCSI bus in target
mode.
Initiator Mode
OPC2
OPC1
OPC0
Instruction Defined
0
0
0
Select
0
0
1
Wait Disconnect
0
1
0
Wait Reselect
0
1
1
Set
1
0
0
Clear
Select Instruction
1. The LSI53C860 arbitrates for the SCSI bus by
asserting the SCSI ID stored in the SCSI Chip ID
(SCID) register. If it loses arbitration, it tries again
during the next available arbitration cycle without
reporting any lost arbitration status.
2. If the LSI53C860 wins arbitration, it attempts to select
the SCSI device whose ID is defined in the destination
ID field of the instruction. Once the LSI53C860 wins
arbitration, it fetches the next instruction from the
address pointed to by the DMA SCRIPTS Pointer
(DSP) register. This way the SCRIPTS can move to
the next instruction before the selection completes. It
continues executing SCRIPTS until a SCRIPT that
requires a response from the Target is encountered.
3. If the LSI53C860 is selected or reselected before
winning arbitration, it fetches the next instruction from
the address pointed to by the 32-bit jump address
field stored in the DMA Next Address (DNAD) register.
I/O Instructions
6-17
Manually set the LSI53C860 to Initiator mode if it is
reselected, or to Target mode if it is selected.
4. If the Select with SATN/ field is set, the SATN/ signal
is asserted during the selection phase.
Wait Disconnect Instruction
1. The LSI53C860 waits for the Target to perform a
“legal” disconnect from the SCSI bus. A “legal”
disconnect occurs when SBSY/ and SSEL/ are
inactive for a minimum of one Bus Free delay
(400 ns), after the LSI53C860 has received a
Disconnect Message or a Command Complete
Message.
Wait Reselect Instruction
1. If the LSI53C860 is selected before being reselected,
it fetches the next instruction from the address pointed
to by the 32-bit jump address field stored in the DMA
Next Address (DNAD) register. Manually set the
LSI53C860 to Target mode when it is selected.
2. If the LSI53C860 is reselected, it fetches the next
instruction from the address pointed to by the DMA
SCRIPTS Pointer (DSP) register.
3. If the CPU sets the SIGP bit in the Interrupt Status
(ISTAT) register, the LSI53C860 aborts the Wait
Reselect instruction and fetches the next instruction
from the address pointed to by the 32-bit jump
address field stored in the DMA Next Address (DNAD)
register.
Set Instruction
When the SACK/ or SATN/ bits are set, the
corresponding bits in the SCSI Output Control Latch
(SOCL) register are set. When the Target bit is set, the
corresponding bit in the SCSI Control Zero (SCNTL0)
register is also set. When the Carry bit is set, the
corresponding bit in the ALU is set.
Clear Instruction
When the SACK/or SATN/ bits are set, the corresponding
bits are cleared in the SCSI Output Control Latch (SOCL)
6-18
Instruction Set of the I/O Processor
register. When the Target bit is set, the corresponding bit
in the SCSI Control Zero (SCNTL0) register is cleared.
When the Carry bit is set, the corresponding bit in the
ALU is cleared.
RA
Relative Addressing Mode
26
When this bit is set, the 24-bit signed value in the DMA
Next Address (DNAD) register is used as a relative
displacement from the current DSP address. This bit
should only be used in conjunction with the Select,
Reselect, Wait Select, and Wait Reselect instructions.
The Select and Reselect instructions can contain an
absolute alternate jump address or a relative transfer
address.
TI
Table Indirect Mode
25
When this bit is set, the 24-bit signed value in the DMA
Byte Counter (DBC) register is added to the value in the
Data Structure Address (DSA) register, used as an offset
relative to the value in the Data Structure Address (DSA)
register. The SCNTL3 value, SCSI ID, synchronous offset
and synchronous period are loaded from this address.
Prior to the start of an I/O, the DSA should be loaded with
the base address of the I/O data structure. The address
may be any address on a Dword boundary. After a Table
Indirect opcode is fetched, the DSA is added to the
24-bit signed offset value from the opcode to generate
the address of the required data; both positive and
negative offsets are allowed. A subsequent fetch from
that address brings the data values into the chip.
SCRIPTS can directly execute operating system I/O data
structures, saving time at the beginning of an I/O
operation. The I/O data structure can begin on any Dword
boundary and may cross system segment boundaries.
There are two restrictions on the placement of data in
system memory:
• The I/O data structure must lie within the 8 Mbytes
above or below the base address.
• An I/O command structure must have all four bytes
contiguous in system memory, as shown below. The
offset/period bits are ordered as in the SCSI Transfer
(SXFER) register. The configuration bits are ordered
as in the SCSI Control Three (SCNTL3) register.
I/O Instructions
6-19
Config
ID
Offset/period
00
This bit should only be used in conjunction with the
Select, Reselect, Wait Select, and Wait Reselect
instructions. Bits 25 and 26 may be set individually or in
combination:
Bit 25
Bit 26
Direct
0
0
Table Indirect
0
1
Relative
1
0
Table Relative
1
1
Direct
Uses the device ID and physical address in the
instruction.
Command
ID
Not Used
Not Used
Absolute Alternate Address
Table Indirect
Uses the physical jump address, but fetches data using
the table indirect method.
Command
Table Offset
Absolute Jump Offset
Relative
Uses the device ID in the instruction, but treats the
alternate address as a relative jump.
Command
ID
Not Used
Not Used
Absolute Jump Offset
Table Relative
Treats the alternate jump address as a relative jump and
fetches the device ID, synchronous offset, and
synchronous period indirectly. Adds the value in bits
6-20
Instruction Set of the I/O Processor
[23:0] of the first four bytes of the SCRIPTS instruction to
the data structure base address to form the fetch
address.
Command
Table Offset
Absolute Jump Offset
Sel
Select with ATN/
24
This bit specifies whether SATN/ will be asserted during
the selection phase when the LSI53C860 is executing a
Select instruction. When operating in initiator mode, set
this bit for the Select instruction. If this bit is set on any
other I/O instruction, an illegal instruction interrupt is
generated.
ENDID
Encoded SCSI Destination ID
[18:16]
This 3-bit field specifies the destination SCSI ID for an I/O
instruction.
CC
Set/Clear Carry
10
This bit is used in conjunction with a Set or Clear
instruction to set or clear the Carry bit. Setting this bit
with a Set instruction asserts the Carry bit in the ALU.
Setting this bit with a Clear instruction deasserts the
Carry bit in the ALU.
TM
Set/Clear Target Mode
9
This bit is used in conjunction with a Set or Clear
instruction to set or clear target mode. Setting this bit with
a Set instruction configures the LSI53C860 as a target
device (this sets bit 0 of the SCSI Control Zero (SCNTL0)
register). Clearing this bit with a Clear instruction
configures the LSI53C860 as an initiator device (this
clears bit 0 of the SCSI Control Zero (SCNTL0) register).
ACK
Set/Clear SACK/
ATN
Set/Clear SATN/
3
These two bits are used in conjunction with a Set or Clear
instruction to assert or deassert the corresponding SCSI
control signal. Bit 6 controls the SCSI SACK/ signal; bit 3
controls the SCSI SATN/ signal.
I/O Instructions
6
6-21
Setting either of these bits will set or reset the
corresponding bit in the SCSI Output Control Latch
(SOCL) register, depending on the instruction used. The
Set instruction is used to assert SACK/ and/or SATN/ on
the SCSI bus. The Clear instruction is used to deassert
SACK/ and/or SATN/ on the SCSI bus.
Since SACK/ and SATN/ are initiator signals, they will not
be asserted on the SCSI bus unless the LSI53C860 is
operating as an initiator or the SCSI Loopback Enable bit
is set in the SCSI Test Two (STEST2) register.
The Set/Clear SCSI ACK/ATN instruction would be used
after message phase Block Move operations to give the
initiator the opportunity to assert attention before
acknowledging the last message byte. For example, if the
initiator wishes to reject a message, an Assert SCSI ATN
instruction would be issued before a Clear SCSI ACK
instruction.
R
Reserved
[2:0]
6.4.2 Second Dword
SA
Start Address
[31:0]
This 32-bit field contains the memory address to fetch the
next instruction if the selection or reselection fails.
If relative or table relative addressing is used, this value
is a 24-bit signed offset relative to the current DMA
SCRIPTS Pointer (DSP) register value.
6.5 Read/Write Instructions
The Read/Write Instruction type moves the contents of one register to
another, or performs arithmetic operations such as AND, OR, XOR,
Addition, and Shift.
6.5.1 First Dword
IT[1:0]
6-22
Instruction Type - Read/Write Instruction
[31:30]
The Read/Write instruction uses operator bits 26 through
24 in conjunction with the opcode bits to determine which
instruction is currently selected.
Instruction Set of the I/O Processor
OPC[2:0]
OpCode
[29:27]
The combinations of these bits determine if the
instruction is a Read/Write or an I/O instruction. Opcodes
000 through 100 are considered I/O instructions. Refer to
Table 6.2 for field definitions.
O[2:0]
Operator
[26:24]
These bits are used in conjunction with the opcode bits
to determine which instruction is currently selected. Refer
to Table 6.2 for field definitions.
A[6:0]
Register Address - A[6:0]
[22:16]
Register values may be changed from SCRIPTS in
read-modify-write cycles or move to/from SFBR cycles.
A[6:0] select an 8-bit source/destination register within
the LSI53C860.
6.5.2 Second Dword
Destination Address
[31:0]
This field contains the 32-bit destination address where
the data is to be moved.
6.5.3 Read-Modify-Write Cycles
During these cycles the register is read, the selected operation is
performed, and the result is written back to the source register.
The Add operation can be used to increment or decrement register
values (or memory values if used in conjunction with a Memory-toRegister Move operation) for use as loop counters.
6.5.4 Move To/From SFBR Cycles
All operations are read-modify-writes. However, two registers are
involved, one of which is always the SFBR. The possible functions of this
instruction are:
•
Write one byte (value contained within the SCRIPTS instruction) into
any chip register.
•
Move to/from the SCSI First Byte Received (SFBR) from/to any other
register.
Read/Write Instructions
6-23
•
Alter the value of a register with AND, OR, ADD, XOR, SHIFT LEFT,
or SHIFT RIGHT operators.
•
After moving values to the SCSI First Byte Received (SFBR), the
compare and jump, call, or similar instructions may be used to check
the value.
•
A Move-to-SFBR followed by a Move-from-SFBR can be used to
perform a register to register move.
Figure 6.4 illustrates the register bit values that represent a Read/Write
instruction.
6-24
Instruction Set of the I/O Processor
Figure 6.4
Read/Write Register Instruction
DCMD Register
DBC Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
Immediate Data
5 4 3 2 1 0
Reserved (must be 0)
A0
A1
A2
A3
Register
Address
A4
A5
A6
0 (Reserved)
Operator 0
Operator 1
Operator 2
Opcode Bit 0
Opcode Bit 1
Opcode Bit 2
1 - Instruction Type - R/W
0 - Instruction Type - R/W
DSPS Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
Read/Write Instructions
7 6
5 4 3 2 1 0
6-25
Table 6.2
Read/Write Instructions
Opcode 111
Read-Modify-Write
Opcode 110
Move to SFBR
Opcode 101
Move from SFBR
000
Move data into register.
Syntax: “Move data8 to
RegA”
Move data into SCSI First
Byte Received (SFBR)
register. Syntax: “Move
data8 to SFBR”
Move data into register.
Syntax: “Move data8 to
RegA”
0011
Shift register one bit to the
left and place the result in
the same register. Syntax:
“Move RegA SHL RegA”
Shift register one bit to the
left and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA SHL
SFBR”
Shift the SCSI First Byte
Received (SFBR) register
one bit to the left and place
the result in the register.
Syntax: “Move SFBR SHL
RegA”
010
OR data with register and
place the result in the same
register. Syntax: “Move
RegA | data8 to RegA”
OR data with register and
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA | data8 to SFBR”
OR data with SFBR and
place the result in the
register. Syntax: “Move
SFBR | data8 to RegA”
011
XOR data with register and
place the result in the same
register. Syntax: “Move
RegA XOR data8 to RegA”
XOR data with register and
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA XOR data8 to SFBR”
XOR data with SFBR and
place the result in the
register. Syntax: “Move
SFBR XOR data8 to RegA”
100
AND data with register and
place the result in the same
register. Syntax: “Move
RegA & data8 to RegA”
AND data with register and
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA & data8 to SFBR”
AND data with SFBR and
place the result in the
register. Syntax: “Move
SFBR & data8 to RegA”
1011
Shift register one bit to the
right and place the result in
the same register. Syntax:
“Move RegA SHR RegA”
Shift register one bit to the
right and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA SHR
SFBR”
Shift the SCSI First Byte
Received (SFBR) register
one bit to the right and place
the result in the register.
Syntax: “Move SFBR SHR
RegA”
Operator
6-26
Instruction Set of the I/O Processor
Table 6.2
Read/Write Instructions (Cont.)
Opcode 111
Read-Modify-Write
Opcode 110
Move to SFBR
Opcode 101
Move from SFBR
110
Add data to register without
carry and place the result
in the same register.
Syntax: “Move RegA +
data8 to RegA”
Add data to register without
carry and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA + data8
to SFBR”
Add data to SFBR without
carry and place the result in
the register. Syntax: “Move
SFBR + data8 to RegA”
111
Add data to register with
carry and place the result
in the same register.
Syntax: “Move RegA +
data8 to RegA with carry”
Add data to register with
carry and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA + data8
to SFBR with carry”
Add data to SFBR with carry
and place the result in the
register. Syntax: “Move
SFBR + data8 to RegA with
carry”
Operator
1. Data is shifted through the Carry bit and the Carry bit is shifted into the data byte.
Miscellaneous Notes:
˘ Substitute the desired register name or address for “RegA” in the syntax examples.
˘ data8 indicates eight bits of data.
6.6 Transfer Control Instructions
The Transfer Control or Conditional Jump instruction allows you to write
SCRIPTS that make decisions based on real time conditions on the SCSI
bus, such as phase or data. This instruction type includes Jump, Call,
Return, and Interrupt instructions.
6.6.1 First Dword
IT[2:0]
Instruction Type Transfer Control Instruction
OPC[2:0]
OpCode
[29:27]
This 3-bit field specifies the type of transfer control
instruction to be executed. All transfer control instructions
can be conditional. They can be dependent on a
true/false comparison of the ALU Carry bit or a
comparison of the SCSI information transfer phase with
the Phase field, and/or a comparison of the First Byte
Received with the Data Compare field. Each instruction
can operate in initiator or target mode.
Transfer Control Instructions
[31:30]
6-27
OPC2
OPC1
OPC0
Instruction Defined
0
0
0
Jump
0
0
1
Call
0
1
0
Return
0
1
1
Interrupt
1
x
x
Reserved
Jump Instruction
The LSI53C860 can do a true/false comparison of the
ALU carry bit, or compare the phase and/or data as
defined by the Phase Compare, Data Compare and
True/False bit fields. If the comparisons are true, the
LSI53C860 loads the DMA SCRIPTS Pointer (DSP)
register with the contents of the DMA SCRIPTS Pointer
Save (DSPS) register. The DMA SCRIPTS Pointer (DSP)
register now contains the address of the next instruction.
If the comparisons are false, the LSI53C860 fetches the
next instruction from the address pointed to by the DMA
SCRIPTS Pointer (DSP) register, leaving the instruction
pointer unchanged.
Call Instruction
The LSI53C860 can do a true/false comparison of the
ALU carry bit, or compare the phase and/or data as
defined by the Phase Compare, Data Compare, and
True/False bit fields. If the comparisons are true, the
LSI53C860 loads the DMA SCRIPTS Pointer (DSP)
register with the contents of the DMA SCRIPTS Pointer
Save (DSPS) register and that address value becomes
the address of the next instruction.
When the LSI53C860 executes a Call instruction, the
instruction pointer contained in the DMA SCRIPTS
Pointer (DSP) register is stored in the Temporary (TEMP)
register. Since the Temporary (TEMP) register is not a
stack and can only hold one Dword, nested call
instructions are not allowed.
If the comparisons are false, the LSI53C860 fetches the
next instruction from the address pointed to by the DMA
SCRIPTS Pointer (DSP) register and the instruction
pointer is not modified.
6-28
Instruction Set of the I/O Processor
Return Instruction
The LSI53C860 can do a true/false comparison of the
ALU carry bit, or compare the phase and/or data as
defined by the Phase Compare, Data Compare, and
True/False bit fields. If the comparisons are true, then the
LSI53C860 loads the DMA SCRIPTS Pointer (DSP)
register with the contents of the DMA SCRIPTS Pointer
Save (DSPS) register. That address value becomes the
address of the next instruction.
When a Return instruction is executed, the value stored
in the Temporary (TEMP) register is returned to the DMA
SCRIPTS Pointer (DSP) register. The LSI53C860 does
not check to see whether the Call instruction has already
been executed. It will not generate an interrupt if a Return
instruction is executed without previously executing a Call
instruction.
Figure 6.5 illustrates the register bit values that represent a Transfer
Control instruction.
Transfer Control Instructions
6-29
Figure 6.5
Transfer Control Instruction
DCMD Register
DBC Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
Mask for Compare
Wait for Valid Phase
5 4 3 2 1 0
Data to be compared
with the SCSI First
Byte Received
Compare Phase
Compare Data
Jump if: True=1, False=0
Interrupt on the Fly
Carry Test
0 (Reserved)
Relative Addressing Mode
I/O
C/D
MSG
Opcode Bit 0
Opcode Bit 1
Opcode Bit 2
1 - Instruction Type - Transfer Control
0 - Instruction Type - Transfer Control
DSPS Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
6-30
Instruction Set of the I/O Processor
7 6
5 4 3 2 1 0
If the comparisons are false, then the LSI53C860 fetches
the next instruction from the address pointed to by the
DMA SCRIPTS Pointer (DSP) register and the instruction
pointer will not be modified.
Interrupt Instruction
The LSI53C860 can do a true/false comparison of the
ALU carry bit, or compare the phase and/or data as
defined by the Phase Compare, Data Compare, and
True/False bit fields. If the comparisons are true, then the
LSI53C860 generates an interrupt by asserting the IRQ/
signal.
The 32-bit address field stored in the DMA SCRIPTS
Pointer Save (DSPS) register can contain a unique
interrupt service vector. When servicing the interrupt, this
unique status code allows the ISR to quickly identify the
point at which the interrupt occurred.
The LSI53C860 halts and the DMA SCRIPTS Pointer
(DSP) register must be written to start any further
operation.
Interrupt on-the-Fly Instruction
The LSI53C860 can do a true/false comparison of the
ALU carry bit or compare the phase and/or data as
defined by the Phase Compare, Data Compare, and
True/False bit fields. If the comparisons are true, and the
Interrupt-on-the-Fly bit is set (bit 2), the LSI53C860 will
assert the Interrupt-on-the-Fly bit (Interrupt Status
(ISTAT) bit 2).
SCSIP[2:0]
SCSI Phase
[26:24]
This 3-bit field corresponds to the three SCSI bus phase
signals which are compared with the phase lines latched
when SREQ/ is asserted. Comparisons can be performed
to determine the SCSI phase actually being driven on the
SCSI bus. The following table describes the possible
combinations and their corresponding SCSI phase.
These bits are only valid when the LSI53C860 is
operating in initiator mode; when the LSI53C860 is
operating in the target mode, these bits should be
cleared.
Transfer Control Instructions
6-31
RA
MSG
C/D
I/O
SCSI Phase
0
0
0
Data-Out
0
0
1
Data-In
0
1
0
Command
0
1
1
Status
1
0
0
Reserved
1
0
1
Reserved
1
1
0
Message-Out
1
1
1
Message-In
Relative Addressing Mode
23
When this bit is set, the 24-bit signed value in the DMA
SCRIPTS Pointer Save (DSPS) register is used as a
relative offset from the current DSP address (which is
pointing to the next instruction, not the one currently
executing). Relative mode does not apply to Return and
Interrupt SCRIPTS.
Jump/Call an Absolute Address
Start execution at the new absolute address.
Command
Condition Codes
Absolute Alternate Address
Jump/Call a Relative Address
Start execution at the current address plus (or minus) the
relative offset.
Command
Condition Codes
Don’t Care
Alternate Jump Offset
The SCRIPTS program counter is a 32-bit value pointing
to the SCRIPTS instruction currently being executed by
the LSI53C860. The next address is formed by adding
the 32-bit program counter to the 24-bit signed value of
the last 24 bits of the Jump or Call instruction. Because
it is signed (2’s complement), the jump can be forward or
backward.
6-32
Instruction Set of the I/O Processor
A relative transfer can be to any address within a
16-Mbyte segment. The program counter is combined
with the 24-bit signed offset (using addition or
subtraction) to form the new execution address.
SCRIPTS programs may contain a mixture of direct
jumps and relative jumps to provide maximum versatility
when writing SCRIPTS. For example, major sections of
code can be accessed with far calls using the 32-bit
physical address, then local labels can be called using
relative transfers. If a SCRIPTS instruction uses only
relative transfers it would not require any run time
alteration of physical addresses, and could be stored in
and executed from a PROM.
CT
Carry Test
21
When this bit is set, decisions based on the ALU carry bit
can be made. True/False comparisons are legal, but Data
Compare and Phase Compare are illegal.
IF
Interrupt-on-the-Fly
20
When this bit is set, the Interrupt instruction will not halt
the SCRIPTS processor. Once the interrupt occurs, the
Interrupt-on-the-Fly bit (Interrupt Status (ISTAT), bit 2) will
be asserted.
JMP
Jump If True/False
19
This bit determines whether the LSI53C860 should
branch when a comparison is true or when a comparison
is false. This bit applies to phase compares, data
compares, and carry tests. If both the Phase Compare
and Data Compare bits are set, then both compares must
be true to branch on a true condition. Both compares
must be false to branch on a false condition.
Bit 19
Result of
Compare
0
False
Jump Taken
0
True
No Jump
1
False
No Jump
1
True
Jump Taken
Transfer Control Instructions
Action
6-33
6-34
CD
Compare Data
18
When this bit is set, the first byte received from the SCSI
data bus (contained in SCSI First Byte Received (SFBR)
register) is compared with the Data to be Compared Field
in the Transfer Control instruction. The Wait for Valid
Phase bit controls when this compare will occur. The
Jump if True/False bit determines the condition (true or
false) to branch on.
CP
Compare Phase
17
When the LSI53C860 is in initiator mode, this bit controls
phase compare operations. When this bit is set, the SCSI
phase signals (latched by SREQ/) are compared to the
Phase Field in the Transfer Control instruction; if they
match, the comparison is true. The Wait for Valid Phase
bit controls when the compare will occur. When the
LSI53C860 is operating in target mode this bit, when set,
tests for an active SCSI SATN/ signal.
WVP
Wait For Valid Phase
16
If the Wait for Valid Phase bit is set, the LSI53C860 waits
for a previously unserviced phase before comparing the
SCSI phase and data. If the Wait for Valid Phase bit is
clear, the LSI53C860 compares the SCSI phase and data
immediately.
DCM
Data Compare Mask
[15:8]
The Data Compare Mask allows a SCRIPTS instruction
to test certain bits within a data byte. During the data
compare, any mask bits that are set cause the
corresponding bit in the SFBR data byte to be ignored.
For instance, a mask of 01111111b and data compare
value of 1XXXXXXXb allows the SCRIPTS processor to
determine whether or not the high order bit is set while
ignoring the remaining bits.
DCV
Data Compare Value
[7:0]
This 8-bit field is the data to be compared against the
SCSI First Byte Received (SFBR) register. These bits are
used in conjunction with the Data Compare Mask Field to
test for a particular data value.
Instruction Set of the I/O Processor
6.6.2
Second Dword
Jump Address
[31:0]
This 32-bit field contains the address of the next
instruction to fetch when a jump is taken. Once the
LSI53C860 has fetched the instruction from the address
pointed to by these 32 bits, this address is incremented
by 4, loaded into the DMA SCRIPTS Pointer (DSP)
register and becomes the current instruction pointer.
6.7 Memory Move Instructions
This SCRIPTS Instruction allows the LSI53C860 to execute high
performance block moves of 32-bit data from one part of main memory
to another. In this mode, the LSI53C860 is an independent,
high-performance DMA controller irrespective of SCSI operations. Since
the registers of the LSI53C860 can be mapped into system memory, this
SCRIPTS instruction also moves an LSI53C860 register to or from
memory or another LSI53C860 register.
For Memory Move instructions, bits 5 and 4 (SIOM and DIOM) in the
DMA Mode (DMODE) register determine whether the source or
destination addresses reside in memory or I/O space. By setting these
bits appropriately, data may be moved within memory space, within I/O
space, or between the two address spaces.
The Memory Move instruction is used to copy the specified number of
bytes from the source address to the destination address.
Allowing the LSI53C860 to perform memory moves frees the system
processor for other tasks and moves data at higher speeds than available
from current DMA controllers. Up to 16 Mbytes may be transferred with
one instruction. There are two restrictions:
•
Both the source and destination addresses must start with the same
address alignment (A[1:0] must be the same). If source and
destination are not aligned, then an illegal instruction interrupt will
occur.
Memory Move Instructions
6-35
•
Indirect addresses are not allowed. A burst of data is fetched from
the source address, put into the DMA FIFO and then written out to
the destination address. The move continues until the byte count
decrements to zero, then another SCRIPTS instruction is fetched
from system memory.
Figure 6.6 illustrates the register bit values that represent a Memory
Move instruction.
6-36
Instruction Set of the I/O Processor
Figure 6.6
Memory to Memory Move Instruction
DCMD Register
DBC Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
5 4 3 2 1 0
No Flush
24-bit Memory Move Byte Counter
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
0 (Reserved)
1 - Instruction Type - Memory Move
1 - Instruction Type - Memory Move
DSPS Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
7 6
5 4 3 2 1 0
7 6
5 4 3 2 1 0
TEMP Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
Memory Move Instructions
6-37
The DMA SCRIPTS Pointer Save (DSPS) and Data Structure Address
(DSA) registers are additional holding registers used during the Memory
Move; however, the contents of the Data Structure Address (DSA)
register are preserved.
6.7.1 First Dword
IT[1:0]
Instruction Type - Memory Move Instruction
R
Reserved
[29:25]
These bits are reserved and must be zero. If any of these
bits are set, an illegal instruction interrupt will occur.
NF
No Flush
Note:
[31:30]
24
This bit has no effect unless the Prefetch Enable bit in the
DMA Control (DCNTL) register is set. For information on
SCRIPTS instruction prefetching, see Chapter 2, “Functional Description.”
When this bit is set, the LSI53C860 performs a Memory
Move (MMOV) without flushing the prefetch unit
(NFMMOV). When this bit is clear, the Memory Move
instruction automatically flushes the prefetch unit.
NFMMOV should be used if the source and destination
are not within four instructions of the current MMOV
instruction.
TC[23:0]
Transfer Count
[23:0]
The number of bytes to be transferred is stored in the
lower 24 bits of the first instruction word.
6.7.2 Second Dword
DSPS Register
[31:0]
These bits contain the source address of the Memory
Move.
6.7.3 Third Dword
TEMP Register
[31:0]
These bits contain the destination address for the
Memory Move.
6-38
Instruction Set of the I/O Processor
6.7.4 Read/Write System Memory from a SCRIPTS Instruction
By using the Memory Move instruction, single or multiple register values
may be transferred to or from system memory.
Because the LSI53C860 will respond to addresses as defined in the
Base I/O or Base Memory registers, it could be accessed during a
Memory Move operation if the source or destination address decodes to
within the chip’s register space. If this occurs, the register indicated by
the lower seven bits of the address is taken to be the data source or
destination. In this way, register values can be saved to system memory
and later restored, and SCRIPTS can make decisions based on data
values in system memory.
The SFBR is not writable using the CPU, and therefore not by a Memory
Move. However, it can be loaded using SCRIPTS Read/Write operations.
To load the SFBR with a byte stored in system memory, the byte must
first be moved to an intermediate LSI53C860 register (for example, a
SCRATCH register), and then to the SFBR.
The same address alignment restrictions apply to register access
operations as to normal memory-to-memory transfers.
6.8 Load and Store Instructions
The Load and Store instruction provides a more efficient way to move
data from/to memory to/from an internal register in the chip without using
the normal memory move instruction.
The load and store instructions are represented by two Dword opcodes.
The first Dword contains the DMA Command (DCMD) and DMA Byte
Counter (DBC) register values. The second Dword contains the DMA
SCRIPTS Pointer Save (DSPS) value. This is either the actual memory
location of where to load or store, or the offset from the DSA, depending
on the value of Bit 28 (DSA Relative).
A maximum of 4 bytes may be moved with these instructions. The
register address and memory address must have the same byte
alignment, and the count set such that it does not cross Dword
boundaries. The destination memory address in the Store instruction and
the source address in the Load instruction may not map back to the
Load and Store Instructions
6-39
operating register set of the chip. If it does, a PCI illegal read/write cycle
will occur, and the chip will issue an interrupt (Illegal Instruction
Detected) immediately following.
Bits A1, A0
Number of Bytes Allowed to Load/Store
00
One, two, three or four
01
One, two, or three
10
One or two
11
One
The SIOM and DIOM bits in the DMA Mode (DMODE) register determine
whether the destination or source address of the instruction is in Memory
space or I/O space. The Load/Store utilizes the PCI commands for I/O
read and I/O write to access the I/O space.
6.8.1 First Dword
6-40
IT[2:0]
Instruction Type
[31:29]
These bits should be 111, indicating the Load and Store
instruction.
DSA
DSA Relative
28
When this bit is clear, the value in the DMA SCRIPTS
Pointer Save (DSPS) is the actual 32-bit memory address
to perform the load/store to/from. When this bit is set, the
chip determines the memory address to perform the
load/store to/from by adding the 24-bit signed offset value
in the DMA SCRIPTS Pointer Save (DSPS) to the Data
Structure Address (DSA).
R
Reserved
NF
No Flush (Store instruction only)
25
When this bit is set, the LSI53C860 performs a Store
without flushing the prefetch unit. When this bit is clear,
the Store instruction automatically flushes the prefetch
unit. No Flush should be used if the source and
destination are not within four instructions of the current
Store instruction.
Instruction Set of the I/O Processor
[27:26]
Note:
This bit has no effect unless the Prefetch Enable bit in the
DMA Control (DCNTL) register is set. For information on
SCRIPTS instruction prefetching, see Chapter 2, “Functional Description.”
LS
Load and Store
24
When this bit is set, the instruction is a Load. When
cleared, it is a Store.
R
Reserved
RA[6:0]
Register Address
[22:16]
A[6:0] select the register to load/store to/from within the
LSI53C860.
Note:
23
It is not possible to load the SCSI First Byte Received
(SFBR) register, although the SFBR contents may be
stored in another location.
R
Reserved
BC
Byte Count
This value is the number of bytes to load/store.
[15:3]
[2:0]
6.8.2 Second Dword
Memory/IO Address / DSA Offset
[31:0]
This is the actual memory location of where to load or
store, or the offset from the Data Structure Address
(DSA) register value.
Figure 6.7 illustrates the register bit values that represent a Load and
Store instruction.
Load and Store Instructions
6-41
Figure 6.7
Load and Store Instruction Format
DCMD Register
DBC Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
Reserved
(must be 0)
5 4 3 2 1 0
Byte Count
(Number of bytes
to load/store)
A0
A1
A2
A3
Register
Address
A4
A5
A6
0 (Reserved)
Load/Store
No Flush
0 - Reserved
0 - Reserved
DSA Relative
1
1
Instruction Type - Load and Store
1
DSPS Register - Memory/ I/O Address/DSA Offset
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
6-42
Instruction Set of the I/O Processor
7 6
5 4 3 2 1 0
Chapter 7
Electrical
Characteristics
This chapter specifies the LSI53C860 electrical and mechanical
characteristics. It is divided into the following sections:
•
Section 7.1, “DC Characteristics”
•
Section 7.2, “TolerANT Technology”
•
Section 7.3, “AC Characteristics”
•
Section 7.4, “PCI Interface Timing Diagrams”
•
Section 7.4.1, “Target Timing”
•
Section 7.5, “PCI Interface Timing”
•
Section 7.6, “SCSI Timing”
•
Section 7.7, “Package Drawings”
7.1 DC Characteristics
This section of the manual describes the LSI53C860 DC characteristics.
Table 7.1 through Table 7.11 give the current and voltage specifications.
LSI53C860 PCI to Ultra SCSI I/O Processor
7-1
Table 7.1
Symbol
Absolute Maximum Stress Ratings
Parameter
Min
Max
Unit
Test Conditions
TSTG
Storage temperature
−55
150
°C
–
VDD
Supply voltage
−0.5
7.0
V
–
VIN
Input voltage
VSS −0.5
VDD +0.5
V
–
±150
–
mA
–
–
2K
V
MIL-STD 883C,
Method 3015.7
ILP1
2
ESD
Latch-up current
Electrostatic discharge
1. − 2 V < VPIN < 8 V.
2. SCSI pins only.
Note: Stresses beyond those listed above may cause permanent damage to the device. These are
stress ratings only; functional operation of the device at these or any other conditions beyond
those indicated in the Operating Conditions section of the manual is not implied.
Table 7.2
Symbol
Operating Conditions
Parameter
Min
Max
Unit
Test Conditions
VDD
Supply voltage
4.75
5.25
V
–
IDD1
Supply current (dynamic)
Supply current (static)
–
–
130
1
mA
mA
–
–
Operating free air
0
70
°C
–
Thermal resistance
(junction to ambient air)
–
67
°C/W
–
TA
θJA
1. Average operating supply current is 50 mA.
Note: Conditions that exceed the operating limits may cause the device to function incorrectly.
7-2
Electrical Characteristics
Table 7.3
Symbol
SCSI Signals—SD[7:0]/, SDP/, SREQ/, SACK/
Parameter
Min
Max
Unit
Test Conditions
VIH
Input high voltage
2.0
VDD +0.5
V
–
VIL
Input low voltage
VSS −0.5
0.8
V
–
VOH1
Output high voltage
2.5
3.5
V
2.5 mA
VOL
Output low voltage
VSS
0.5
V
48 mA
IIN
Input leakage
−10
10
µA
–
IOZ
3-state leakage
−10
10
µA
–
1. TolerANT active negation enabled.
Table 7.4
SCSI Signals—SMSG, SI_O/, SC_D/, SATN/, SBSY/, SSEL/, SRST/
Symbol
Parameter
Min
Max
Unit
Test Conditions
VIH
Input high voltage
2.0
VDD +0.5
V
–
VIL
Input low voltage
VSS −0.5
0.8
V
–
VOL
Output low voltage
VSS
0.5
V
48 mA
IIN
Input leakage
(SRST/ only)
−10
−500
10
−50
µA
µA
–
IOZ
3-state leakage
−10
10
µA
–
Table 7.5
Symbol
Input Signals—CLK, SCLK, GNT/, IDSEL, RST/, TESTIN
Parameter
Min
Max
Unit
Test Conditions
VIH
Input high voltage
2.0
VDD +0.5
V
–
VIL
Input low voltage
VSS −0.5
0.8
V
–
IIN
Input leakage
−1.0
1.0
µA
–
Note: CLK, SCLK, GNT/ and IDSEL have 100 µA pull-ups that are enabled when TESTIN is low.
TESTIN has a 100 µA pull-up that is always enabled.
DC Characteristics
7-3
Table 7.6
Symbol
CI
CIO
Table 7.7
Symbol
Capacitance
Parameter
Min
Max
Unit
Test Conditions
Input capacitance of input pads
–
7
pF
–
Input capacitance of I/O pads
–
10
pF
–
Output Signals—MAC/_TESTOUT, REQ/
Parameter
Min
Max
Unit
Test Conditions
VOH
Output high voltage
2.4
VDD
V
−16 mA
VOL
Output low voltage
VSS
0.4
V
16 mA
IOH
Output high current
−8
–
mA
VDD −0.5 V
IOL
Output low current
16
–
mA
0.4 V
IOZ
3-state leakage
−10
10
µA
–
Note: REQ/ has a 100 µA pull-up that is enabled when TESTIN is low.
Table 7.8
Symbol
Output Signal—IRQ/
Parameter
Min
Max
Unit
Test Conditions
VOH
Output high voltage
2.4
VDD
V
−8 mA
VOL
Output low voltage
VSS
0.4
V
8 mA
IOH
Output high current
−4
–
mA
VDD −0.5 V
IOL
Output low current
8
–
mA
0.4 V
IOZ
3-state leakage
−10
10
µA
–
Note: IRQ/ has a 100 µA pull-up that is enabled when TESTIN is low. IRQ/ can be enabled with a
register as an open drain with an internal 100 µA pull-up.
7-4
Electrical Characteristics
Table 7.9
Output Signal—SERR/
Symbol Parameter
Min
Max
Unit
Test Conditions
VOL
Output low voltage
VSS
0.4
V
16 mA
IOL
Output low current
16
–
mA
0.4 V
IOZ
3-state leakage
−10
10
µA
–
Table 7.10
Bidirectional Signals—AD[31:0], C_BE/[3:0], FRAME/, IRDY/, TRDY/,
DEVSEL/, STOP/, PERR/, PAR/
Symbol Parameter
Min
Max
Unit
Test Conditions
VIH
Input high voltage
2.0
VDD +0.5
V
–
VIL
Input low voltage
VSS −0.5
0.8
V
–
VOH
Output high voltage
2.4
VDD
V
16 mA
VOL
Output low voltage
VSS
0.4
V
16 mA
IOH
Output high current
−8
–
mA
VDD −0.5
IOL
Output low current
16
–
mA
0.4 V
IIN
Input leakage
−10
10
µA
VSS < VIN < VDD
IOZ
3-state leakage
−10
10
µA
–
Note: All the signals in this table have 100 µA pull-ups that are enabled when TESTIN is low.
DC Characteristics
7-5
Table 7.11
Symbol
Bidirectional Signals—GPIO0_FETCH/, GPIO1_MASTER/
Parameter
Min
Max
Unit
Test Conditions
VIH
Input high voltage
2.0
VDD +0.5
V
–
VIL
Input low voltage
VSS −0.5
0.8
V
–
VOH
Output high voltage
2.4
VDD
V
−16 mA
VOL
Output low voltage
VSS
0.4
V
16 mA
IOH
Output high current
−8
–
mA
2.4 V
IOL
Output low current
16
–
mA
0.4 V
IIN
Input leakage
−10
10
µA
–
IOZ
3-state leakage
−10
10
µA
–
Note: All the signals in this table have 100 µA pull-ups that are enabled when TESTIN is low.
7.2 TolerANT Technology
The LSI53C860 features TolerANT technology, which includes active
negation on the SCSI drivers and input signal filtering on the SCSI
receivers. Active negation actively drives the SCSI Request,
Acknowledge, Data, and Parity signals HIGH rather than allowing them
to be passively pulled up by terminators. Table 7.12 provides electrical
characteristics for SE SCSI signals. Figure 7.1 through Figure 7.5 show
the effect of TolerANT technology on the DC characteristics of the chip.
7-6
Electrical Characteristics
Table 7.12
Symbol
TolerANT Technology Electrical Characteristics
Parameter
Min
Max
Unit
Test Conditions
VOH
Output high voltage
2.5
3.5
V
IOH = 2.5 mA
VOL
Output low voltage
0.1
0.5
V
IOL = 48 mA
VIH
Input high voltage
2.0
7.0
V
–
VIL
Input low voltage
−0.5
0.8
V
Referenced to VSS
VIK
Input clamp voltage
−0.66
−0.77
V
VDD = 4.75; II = −20 mA
VTH
Threshold, HIGH to LOW
1.1
1.3
V
–
VTL
Threshold, LOW to HIGH
1.5
1.7
V
–
200
400
mV
–
VOH = 2.5 V
1
VTH–VTL Hysteresis
1
IOH
Output high current
2.5
24
mA
IOL
Output low current
100
200
mA
VOL = 0.5 V
IOSH1
Short-circuit output high current
–
625
mA
Output driving low, pin
shorted to VDD supply2
IOSL
Short-circuit output low current
–
95
mA
Output driving high, pin
shorted to VSS supply
ILH
Input high leakage
–
10
µA
−0.5 < VDD < 5.25
VPIN = 2.7 V
ILL
Input low leakage
–
−10
µA
−0.5 < VDD < 5.25
VPIN = 0.5 V
RI
Input resistance
20
–
MΩ
SCSI pins3
CP
Capacitance per pin
–
10
pF
PQFP
9.7
18.5
ns
Figure 7.1
tR
1
Rise time, 10% to 90%
Fall time, 90% to 10%
5.2
14.7
ns
Figure 7.1
dVH/dt
Slew rate, LOW to HIGH
0.15
0.49
V/ns
Figure 7.1
dVL/dt
Slew rate, HIGH to LOW
0.19
0.52
V/ns
Figure 7.1
2
–
kV
MIL-STD-883C; 3015-7
tF
ESD
Electrostatic discharge
Latch-up
100
–
mA
–
Filter delay
20
30
ns
Figure 7.2
Extended filter delay
40
60
ns
Figure 7.2
1. Active negation outputs only: Data, Parity, SREQ/, SACK/.
2. Single pin only; irreversible damage may occur if sustained for one second.
3. SCSI RESET pin has 10 kΩ pull-up resistor.
Note: These values are guaranteed by periodic characterization; they are not 100% tested on every
device.
TolerANT Technology
7-7
Figure 7.1
Rise and Fall Time Test Conditions
47 Ω
+
20 pF
2.5 V
−
Figure 7.2
SCSI Input Filtering
t1
VTH
REQ/ or ACK/ Input
Note: t1 is the input filtering period.
Figure 7.3
Hysteresis of SCSI Receiver
1.1
1.3
Receiving Logic Level
1
0
1.5
1.7
Input Voltage (Volts)
7-8
Electrical Characteristics
Figure 7.4
Input Current as a Function of Input Voltage
Input Current (milliAmperes)
+40
+20
14.4 V
8.2 V
0
− 0.7 V
HIGH-Z
OUTPUT
−20
ACTIVE
−40
−4
0
4
8
12
16
Input Voltage (Volts)
Output Current as a Function of Output Voltage
0
−200
−400
−600
−800
0
1
2
3
4
5
Output Voltage (Volts)
TolerANT Technology
Output Source Current (milliamperes)
Output Sink Current (milliamperes)
Figure 7.5
100
80
60
40
20
0
0
1
2
3
4
5
Output Voltage (Volts)
7-9
7.3 AC Characteristics
The AC characteristics described in this section apply over the entire
range of operating conditions (refer to Section 7.1, “DC Characteristics”),
Chip timings are based on simulation at worst case voltage, temperature,
and processing. Timings were developed with a load capacitance of
50 pF. Table 7.13 and Figure 7.6 provide clock timing data.
Table 7.13
Symbol
t1
Clock Timing
Parameter
Min
Max
Unit
30
DC
ns
12.5
60
ns
CLK LOW time2
12
–
ns
SCLK LOW time2
5
33
ns
CLK HIGH time2
12
–
ns
5
33
ns
CLK slew rate
1
–
V/ns
SCLK slew rate
1
–
V/ns
Bus clock cycle time
SCSI clock cycle time
t2
t3
SCLK HIGH
t4
(SCLK)1
time2
1. This parameter must be met to ensure SCSI timings are within specification.
2. Duty cycle not to exceed 60/40.
Figure 7.6
Clock Timing Waveform
t1
t3
CLK, SCLK
t2
t4
7-10
Electrical Characteristics
Table 7.14 and Figure 7.7 provide Reset Input timing data.
Table 7.14
Symbol
Reset Input
Parameter
Min
Max
Unit
t1
Reset pulse width
10
–
tCLK
t2
Reset deasserted setup to CLK HIGH
0
–
ns
Figure 7.7
Reset Input Waveforms
CLK
t1
t2
RST/
t3
MAD1
t4
Valid Data
1. When enabled.
Table 7.15 and Figure 7.8 provide Interrupt Output timing data.
Table 7.15
Symbol
Interrupt Output
Parameter
Min
Max
Unit
t1
CLK HIGH to IRQ/ LOW
–
20
ns
t2
CLK HIGH to IRQ/ HIGH
–
40
ns
t3
IRQ/ deassertion time
3
–
CLK
Figure 7.8
Interrupt Output Waveforms
t2
t3
t1
IRQ/
CLK
AC Characteristics
7-11
7.4 PCI Interface Timing Diagrams
Figure 7.9 through Figure 7.18 represent signal activity when the
LSI53C860 accesses the PCI bus. The timings for the PCI bus interface
are listed on page 7-25. The following timing diagrams are included in
this section:
Target Timing
•
PCI Configuration Register Read
•
PCI Configuration Register Write
•
Target Read
•
Target Write
Initiator Timing
7-12
•
OpCode Fetch, Nonburst
•
Burst OpCode Fetch
•
Back-to-Back Read
•
Back-to-Back Write
•
Burst Read
•
Burst Write
Electrical Characteristics
7.4.1 Target Timing
Figure 7.9 through Figure 7.12 describe Target timing.
Figure 7.9
PCI Configuration Register Read
CLK
(Driven by System)
FRAME/
(Driven by System)
t1
t2
AD/
(Driven by Master-Addr;
LSI53C860-Data)
t1
t3
Addr
In
t1
C_BE/
(Driven by Master)
Data Out
t2
CMD
t2
PAR
(Driven by Master-Addr;
LSI53C860-Data)
t2
Byte Enable
t3
t1
Out
In
t2
IRDY/
(Driven by Master)
t2
t1
t3
TRDY/
(Driven by LSI53C860)
STOP/
(Driven by LSI53C860)
DEVSEL/
(Driven by LSI53C860)
t3
t1
IDSEL
(Driven by Master)
t2
PCI Interface Timing Diagrams
7-13
Figure 7.10 PCI Configuration Register Write
CLK
(Driven by System)
t1
FRAME/
(Driven by Master)
t1
AD/
(Driven by Master)
t2
t1
t2
Addr
In
t1
C_BE/
(Driven by Master)
Data In
t2
t2
CMD
Byte Enable
t2
PAR/
(Driven by Master)
t1
IRDY/
(Driven by Master)
t1
t2
TRDY/
(Driven by LSI53C860)
t3
STOP/
(Driven by LSI53C860)
DEVSEL/
(Driven by LSI53C860)
t3
t1
IDSEL
(Driven by Master)
7-14
t2
t2
Electrical Characteristics
Figure 7.11 Target Read
CLK
(Driven by System)
t1
FRAME/
(Driven by Master)
t2
PAR
(Driven by Master-Addr;
LSI53C860-Data)
IRDY/
(Driven by Master)
Data
Out
Addr
In
t1
C_BE/
(Driven by Master)
t3
t1
AD/
(Driven by Master-Addr;
LSI53C860-Data)
t2
Byte Enable
CMD
t2
t2
t1
In
t3
Out
t2
t1
t2
t3
TRDY/
(Driven by LSI53C860)
t3
STOP/
(Driven by LSI53C860)
DEVSEL/
(Driven by LSI53C860)
t3
PCI Interface Timing Diagrams
7-15
Figure 7.12 Target Write
CLK
(Driven by System)
t1
FRAME/
(Driven by Master)
t2
t1
AD/
(Driven by Master)
Addr
In
t1
C_BE/
(Driven by Master)
PAR/
(Driven by Master)
IRDY/
(Driven by Master)
t2
t1
Data In
t2
Byte Enable
CMD
t2
t1
t2
t2
t2
t3
STOP/
(Driven by LSI53C860)
DEVSEL/
(Driven by LSI53C860)
7-16
t2
t1
TRDY/
(Driven by LSI53C860)
t3
Electrical Characteristics
t1
7.4.2 Initiator Timing
Figure 7.13 through Figure 7.18 describe Initiator timing.
Figure 7.13 OpCode Fetch, Nonburst
CLK
(Driven by System)
GPIO0_FETCH/
(Driven by LSI53C860)
t8
t7
t9
GPIO1_MASTER/
(Driven by LSI53C860)
REQ/
(Driven by LSI53C860)
t10
t6
t4
GNT/
(Driven by Arbiter)
t5
FRAME/
(Driven by LSI53C860)
t3
t1
Data
In
AD/
(Driven by LSI53C860Addr; Target-Data)
C_BE/
(Driven by LSI53C860)
PAR/
(Driven by LSI53C860Addr/ Target-Data)
Data
In
Addr
Out
Addr
Out
t2
t3
CMD
t3
CMD
BE
BE
t1
t3
t3
t2
IRDY/
(Driven by LSI53C860)
t3
t1
TRDY/
(Driven by Target)
t2
STOP/
(Driven by Target)
t1
DEVSEL/
(Driven by Target)
PCI Interface Timing Diagrams
t2
7-17
Figure 7.14 Burst OpCode Fetch
CLK
(Driven by System)
GPIO0_FETCH/
(Driven by LSI53C860)
t7
t8
t10
t9
GPIO1_MASTER/
(Driven by LSI53C860)
t6
REQ/
(Driven by LSI53C860)
t4
GNT/
(Driven by Arbiter)
t5
FRAME/
(Driven by LSI53C860)
t3
t1
Data
In
t3
AD/
(Driven by LSI53C860Addr; Target-Data)
C_BE/
(Driven by LSI53C860)
Data
In
Addr
Out
t3
t2
CMD
t3
BE
t1
t3
PAR
(Driven by LSI53C860Addr; Target-Data)
Out
In
In
t2
t3
IRDY/
(Driven by LSI53C860)
t3
TRDY/
(Driven by Target)
t1
t2
STOP/
(Driven by Target)
t2
t1
DEVSEL/
(Driven by Target)
7-18
Electrical Characteristics
Figure 7.15 Back-to-Back Read
CLK
(Driven by System)
GPIO0_FETCH/
(Driven by LSI53C860)
t10
t9
GPIO1_MASTER/
(Driven by LSI53C860)
REQ/
(Driven by LSI53C860)
t6
GNT/
(Driven by Arbiter)
t4
FRAME/
t5
t3
(Driven by LSI53C860)
AD/
(Driven by LSI53C860)
PAR
Data In
Addr
Out
t2
t3
CMD
BE
CMD
BE
t1
t3
(Driven by LSI53C860Addr; Target-Data)
IRDY/
Data In
Addr
Out
(Driven by LSI53C860Addr; Target-Data)
C_BE/
t1
t3
Out
Out
In
In
t2
t3
(Driven by LSI53C860)
TRDY/
(Driven by Target)
t1
t2
STOP/
(Driven by Target)
DEVSEL/
(Driven by Target)
t1
PCI Interface Timing Diagrams
t2
7-19
Figure 7.16 Back-to-Back Write
CLK
(Driven by System)
GPIO0_FETCH/
(Driven by LSI53C860)
t9
t10
GPIO1_MASTER/
(Driven by LSI53C860)
REQ/
t6
(Driven by LSI53C860)
GNT/
(Driven by Arbiter)
FRAME/
t4
t5
t3
(Driven by LSI53C860)
AD/
t3
(Driven by LSI53C860)
C_BE/
(Driven by LSI53C860)
PAR/
t3
Addr Data
Out Out
Addr Data
Out Out
t3
t3
CMD
BE
CMD
t3
BE
t3
(Driven by LSI53C860)
t3
IRDY/
(Driven by LSI53C860)
TRDY/
(Driven by Target)
t1
t2
STOP/
(Driven by Target)
DEVSEL/
(Driven by Target)
7-20
t1
Electrical Characteristics
t2
Figure 7.17 Burst Read
CLK
GPIO0_FETCH/
(Driven by LSI53C860)
GPIO1_MASTER/
(Driven by LSI53C860)
REQ/
(Driven by LSI53C860)
GNT/
(Driven by Arbiter)
FRAME/
(Driven by LSI53C860)
Data In
AD
(Driven by LSI53C860Addr; Target-Data)
Addr
Out
Addr
Out
t3
C_BE/
(Driven by LSI53C860)
CMD
CMD
BE
t2
PAR
(Driven by LSI53C860Addr; Target-Data)
Out
In
t1
IRDY/
(Driven by LSI53C860)
t1
TRDY/
(Driven by Target)
t2
STOP/
(Driven by Target)
DEVSEL/
(Driven by Target)
t2
PCI Interface Timing Diagrams
7-21
Figure 7.17 Burst Read (Cont.)
CLK
GPIO0_FETCH/
(Driven by LSI53C860)
GPIO1_MASTER/
(Driven by LSI53C860)
REQ/
(Driven by LSI53C860)
GNT/
(Driven by Arbiter)
FRAME/
(Driven by LSI53C860)
Data In
AD
(Driven by LSI53C860Addr; Target-Data)
Addr
Out
C_BE/
(Driven by LSI53C860)
PAR
(Driven by LSI53C860Addr; Target-Data)
BE
CMD
In
Out
In
IRDY/
(Driven by LSI53C860)
TRDY/
(Driven by Target)
STOP/
(Driven by Target)
t1
t2
DEVSEL/
(Driven by Target)
7-22
Electrical Characteristics
BE
Out
In
Figure 7.18 Burst Write
CLK
(Driven by System)
GPIO0_
FETCH/
(Driven by LSI53C860)
t9
GPIO1_
MASTER/
(Driven by LSI53C860)
t10
t6
REQ/
(Driven by LSI53C860)
t5
GNT/
(Driven by Arbiter)
t4
t3
FRAME/
(Driven by LSI53C860)
AD
(Driven by LSI53C860)
t3
t3
C_BE/
(Driven by LSI53C860)
t3
Addr Data
Out
Out
t3
BE
CMD
Addr
Out
CMD
t3
PAR
(Driven by LSI53C860)
t3
IRDY/
(Driven by LSI53C860)
TRDY/
(Driven by Target)
STOP/
(Driven by Target)
DEVSEL/
(Driven by Target)
PCI Interface Timing Diagrams
7-23
Figure 7.18 Burst Write (Cont.)
CLK
(Driven by System)
GPIO0_
FETCH/
(Driven by LSI53C860)
GPIO1_
MASTER/
(Driven by LSI53C860)
REQ/
(Driven by LSI53C860)
GNT/
(Driven by Arbiter)
FRAME/
(Driven by LSI53C860)
AD
(Driven by LSI53C860)
Data
Out
C_BE/
(Driven by LSI53C860)
Data
Out
BE
PAR
(Driven by LSI53C860)
IRDY/
(Driven by LSI53C860)
TRDY/
(Driven by Target)
t1
t2
STOP/
(Driven by Target)
DEVSEL/
(Driven by Target)
7-24
t1
t2
Electrical Characteristics
Addr
Out
Data
Out
CMD
BE
7.5 PCI Interface Timing
Table 7.16 describes the PCI timing data for the LSI53C860.
Table 7.16
Symbol
PCI Timing
Parameter
Min
Max
Unit
t1
Shared signal input setup time
7
–
ns
t2
Shared signal input hold time
0
–
ns
t3
CLK to shared signal output valid
–
11
ns
t4
Side signal input setup time
10
–
ns
t5
Side signal input hold time
0
–
ns
t6
CLK to side signal output valid
–
12
ns
t7
CLK high to FETCH/ low
–
20
ns
t8
CLK high to FETCH/ high
–
20
ns
t9
CLK high to MASTER/ low
–
20
ns
t10
CLK high to MASTER/ high
–
20
ns
PCI Interface Timing
7-25
7.6 SCSI Timing
Tables 7.17 through 7.23 and Figures 7.19 through 7.23 describe the
LSI53C860 SCSI timing data.
Table 7.17
Symbol
Initiator Asynchronous Send (5 Mbytes/s)
Parameter
Min
Max
Unit
t1
SACK/ asserted from SREQ/ asserted
10
–
ns
t2
SACK/ deasserted from SREQ/ deasserted
10
–
ns
t3
Data setup to SACK/ asserted
55
–
ns
t4
Data hold from SREQ/ deasserted
20
–
ns
Figure 7.19 Initiator Asynchronous Send
SREQ/
n+1
t1
SACK/
t2
t3
SD[7:0],
SDP/
7-26
n+1
n
t4
Valid n
Electrical Characteristics
Valid n + 1
Table 7.18
Symbol
Initiator Asynchronous Receive (5 Mbytes/s)
Parameter
Min
Max
Unit
t1
SACK/ asserted from SREQ/ asserted
10
–
ns
t2
SACK/ deasserted from SREQ/ deasserted
10
–
ns
t3
Data setup to SREQ/ asserted
0
–
ns
t4
Data hold from SACK/ asserted
0
–
ns
Figure 7.20 Initiator Asynchronous Receive
SREQ/
n
n+1
t1
t2
SACK/
n
SD[7:0],
SDP/
Table 7.19
Symbol
n+1
t4
t3
Valid n
Valid n + 1
Target Asynchronous Send (5 Mbytes/s)
Parameter
Min
Max
Unit
t1
SACK/ asserted from SREQ/ asserted
10
–
ns
t2
SACK/ deasserted from SREQ/ deasserted
10
–
ns
t3
Data setup to SREQ/ asserted
55
–
ns
t4
Data hold from SACK/ asserted
20
–
ns
Figure 7.21 Target Asynchronous Send
SREQ/
n
n+1
t1
SACK/
n
t3
SD[7:0],
SDP/
t2
n+1
t4
Valid n
SCSI Timing
Valid n + 1
7-27
Table 7.20
Symbol
Target Asynchronous Receive (5 Mbytes/s)
Parameter
Min
Max
Unit
t1
SREQ/ deasserted from SACK/ asserted
10
–
ns
t2
SREQ/ asserted from SACK/ deasserted
10
–
ns
t3
Data setup to SREQ/ asserted
0
–
ns
t4
Data hold from SACK/ asserted
0
–
ns
Figure 7.22 Target Asynchronous Receive
SREQ/
n
n+1
t1
t2
SACK/
n+1
n
t3
SD[7:0],
SDP/
t4
Valid n
Valid n + 1
Figure 7.23 Initiator and Target Synchronous Transfers
t1
SREQ/
or SACK/
n
t3
Send Data
SD[7:0], SDP/
Receive Data
SD[15:0]/,
SDP[1:0]/
7-28
n+1
t4
Valid n
t5
t2
Valid n + 1
t6
Valid n
Electrical Characteristics
Valid n + 1
Table 7.21
Symbol
SCSI-1 Transfers (SE, 5.0 Mbytes/s)
Parameter
Min
Max
Unit
t1
Send SREQ/ or SACK/ assertion pulse width
90
–
ns
t2
Send SREQ/ or SACK/ deassertion pulse width
90
–
ns
t1
Receive SREQ/ or SACK/ assertion pulse width
90
–
ns
t2
Receive SREQ/ or SACK/ deassertion pulse width
90
–
ns
t3
Send data setup to SREQ/ or SACK/ asserted
55
–
ns
t4
Send data hold from SREQ/ or SACK/ asserted
100
–
ns
t5
Receive data setup to SREQ/ or SACK/ asserted
0
–
ns
t6
Receive data hold from SREQ/ or SACK/ asserted
45
–
ns
Table 7.22
Symbol
SCSI-2 Fast Transfers (10.0 Mbytes/s (8-Bit Transfers), 40 MHz Clock)
Parameter
Min
Max
Unit
t1
Send SREQ/ or SACK/ assertion pulse width
35
–
ns
t2
Send SREQ/ or SACK/ deassertion pulse width
35
–
ns
t1
Receive SREQ/ or SACK/ assertion pulse width
20
–
ns
t2
Receive SREQ/ or SACK/deassertion pulse width
20
–
ns
t3
Send data setup to SREQ/ or SACK/ asserted
33
–
ns
t4
Send data hold from SREQ/ or SACK/ asserted
45
–
ns
t5
Receive data setup to SREQ/ or SACK/ asserted
0
–
ns
t6
Receive data hold from SREQ/ or SACK/ asserted
10
–
ns
Notes: Transfer period bits (bits [7:5] in the SCSI Transfer (SXFER) register) are set to zero and the
Extra Clock cycle of Data Setup bit (bit 7 in SCSI Control One (SCNTL1)) is set. Analysis of
system configuration is recommended due to reduced driver skew margin in differential
systems. For Fast SCSI, set the TolerANT Enable bit (bit 7 in SCSI Test Three (STEST3)).
SCSI Timing
7-29
Table 7.23
Symbol
Ultra SCSI Transfers (20.0 Mbytes/s (8-Bit Transfers), 80 MHz Clock)
Parameter
Min
Max
Unit
t1
Send SREQ/ or SACK/ assertion pulse width
16
–
ns
t2
Send SREQ/ or SACK/ deassertion pulse width
16
–
ns
t1
Receive SREQ/ or SACK/ assertion pulse width
10
–
ns
t2
Receive SREQ/ or SACK/deassertion pulse width
10
–
ns
t3
Send data setup to SREQ/ or SACK/ asserted
12
–
ns
t4
Send data hold from SREQ/ or SACK/ asserted
17
–
ns
t5
Receive data setup to SREQ/ or SACK/ asserted
0
–
ns
t6
Receive data hold from SREQ/ or SACK/ asserted
6
–
ns
Notes: Transfer period bits (bits [7:5] in the SCSI Transfer (SXFER) register) are set to zero and the
Extra Clock cycle of Data Setup bit (bit 7 in SCSI Control One (SCNTL1)) is set. For fast SCSI,
set the TolerANT Enable bit (bit 7 in SCSI Test Three (STEST3)). During Ultra SCSI transfers,
the value of the Extend REQ/ ACK Filtering bit (SCSI Test Two (STEST2), bit 1) has no effect.
7.7 Package Drawings
Figure 7.24 illustrates the mechanical drawing for the LSI53C860.
7-30
Electrical Characteristics
Figure 7.24 100 LD PQFP (UD) Mechanical Drawing (Sheet 1 of 2)
Important:
This drawing may not be the latest version. For board layout and manufacturing, obtain the
most recent engineering drawings from your LSI Logic marketing representative by
requesting the outline drawing for package code UD.
Package Drawings
7-31
Figure 7.24
Important:
7-32
100 LD PQFP (UD) Mechanical Drawing (Sheet 2 of 2)
This drawing may not be the latest version. For board layout and manufacturing, obtain the
most recent engineering drawings from your LSI Logic marketing representative by
requesting the outline drawing for package code UD.
Electrical Characteristics
Appendix A
Register Summary
Table A.1 lists the LSI53C860 configuration registers by register name.
Table A.1
Configuration Registers
Register Name
Address
Read/Write Page
Base Address One (Memory)
0x14
Read/Write
3-17
Base Address Zero (I/O)
0x10
Read/Write
3-17
Cache Line Size
0x0C
Read/Write
3-15
Class Code
0x09
Read Only
3-15
Command
0x04
Read/Write
3-11
Device ID
0x02
Read Only
3-11
Header Type
0x0E
Read Only
3-16
Interrupt Line
0x3C
Read/Write
3-17
Interrupt Pin
0x3D
Read Only
3-18
Latency Timer
0x0D
Read/Write
3-16
Max_Lat
0x3F
Read Only
3-19
Min_Gnt
0x3E
Read Only
3-18
Revision ID
0x08
Read Only
3-14
Status
0x06
Read/Write
3-13
Vendor ID
0x00
Read Only
3-11
LSI53C860 PCI to Ultra SCSI I/O Processor
A-1
Table A.2 lists the LSI53C860 SCSI registers by register name.
Table A.2
SCSI Registers
Register Name
Address
Read/Write
Page
Adder Sum Output (ADDER)
0x3C–0x3F (0xBC–0xBF)
Read Only
5-48
Chip Test Five (CTEST5)
0x22 (0xA2)
Read/Write
5-37
Chip Test Four (CTEST4)
0x21 (0xA1)
Read/Write
5-36
Chip Test One (CTEST1)
0x19 (0x99)
Read Only
5-31
Chip Test Six (CTEST6)
0x23 (0xA3)
Read/Write
5-38
Chip Test Three (CTEST3)
0x1B (0x9B)
Read/Write
5-33
Chip Test Two (CTEST2)
0x1A (0x9A)
Read Only
5-32
Chip Test Zero (CTEST0)
0x18 (0x98)
Read/Write
5-31
Data Structure Address (DSA)
0x10–0x13 (0x90–0x93)
Read/Write
5-27
DMA Byte Counter (DBC)
0x24–0x26 (0xA4–0xA6)
Read/Write
5-39
DMA Command (DCMD)
0x27 (0xA7)
Read/Write
5-40
DMA Control (DCNTL)
0x3B (0xBB)
Read/Write
5-46
DMA FIFO (DFIFO)
0x20 (0xA0)
Read/Write
5-35
DMA Interrupt Enable (DIEN)
0x39 (0xB9)
Read/Write
5-44
DMA Mode (DMODE)
0x38 (0xB8)
Read/Write
5-42
DMA Next Address (DNAD)
0x28–0x2B (0xA8–0xAB)
Read/Write
5-40
DMA SCRIPTS Pointer (DSP)
0x2C–0x2F (0xAC–0xAF)
Read/Write
5-41
DMA SCRIPTS Pointer Save (DSPS)
0x30–0x33 (0xB0–0xB3)
Read/Write
5-41
DMA Status (DSTAT)
0x0C (0x8C)
Read Only
5-21
General Purpose (GPREG)
0x07 (0x87)
Read/Write
5-17
General Purpose Pin Control (GPCNTL)
0x47 (0xC7)
Read/Write
5-58
Interrupt Status (ISTAT)
0x14 (0x94)
Read/Write
5-27
Memory Access Control (MACNTL)
0x46 (0xC6)
Read/Write
5-57
Response ID (RESPID)
0x4A (0xCA)
Read/Write
5-61
A-2
Register Summary
Table A.2
SCSI Registers
Register Name
Address
Read/Write
Page
Scratch Byte Register (SBR)
0x3A (0xBA)
Read/Write
5-46
Scratch Register A (SCRATCHA)
0x34–0x37 (0xB4–0xB7)
Read/Write
5-42
Scratch Register B (SCRATCHB)
0x5C–0x5F (0xDC–0xDF)
Read/Write
5-69
SCSI Bus Control Lines (SBCL)
0x0B (0x8B)
Read Only
5-21
SCSI Bus Data Lines (SBDL)
0x58 (0xD8)
Read Only
5-68
SCSI Chip ID (SCID)
0x04 (0x84)
Read/Write
5-12
SCSI Control One (SCNTL1)
0x01 (0x81)
Read/Write
5-6
SCSI Control Three (SCNTL3)
0x03 (0x83)
Read/Write
5-10
SCSI Control Two (SCNTL2)
0x02 (0x82)
Read/Write
5-9
SCSI Control Zero (SCNTL0)
0x00 (0x80)
Read/Write
5-3
SCSI Destination ID (SDID)
0x06 (0x86)
Read/Write
5-16
SCSI First Byte Received (SFBR)
0x08 (0x88)
Read/Write
5-18
SCSI Input Data Latch (SIDL)
0x50 (0xD0)
Read Only
5-67
SCSI Interrupt Enable One (SIEN1)
0x41 (0xC1)
Read/Write
5-51
SCSI Interrupt Enable Zero (SIEN0)
0x40 (0xC0)
Read/Write
5-48
SCSI Interrupt Status One (SIST1)
0x43 (0xC3)
Read Only
5-54
SCSI Interrupt Status Zero (SIST0)
0x42 (0xC2)
Read Only
5-52
SCSI Longitudinal Parity (SLPAR)
0x44 (0xC4)
Read/Write
5-55
SCSI Output Control Latch (SOCL)
0x09 (0x89)
Read /Write 5-19
SCSI Output Data Latch (SODL)
0x54 (0xD4)
Read/Write
5-68
SCSI Selector ID (SSID)
0x0A (0x8A)
Read Only
5-20
SCSI Status One (SSTAT1)
0x0E (0x8E)
Read Only
5-25
SCSI Status Two (SSTAT2)
0x0F (0x8F)
Read Only
5-26
SCSI Status Zero (SSTAT0)
0x0D (0x8D)
Read Only
5-23
SCSI Test One (STEST1)
0x4D (0xCD)
Read/Write
5-63
Register Summary
A-3
Table A.2
SCSI Registers
Register Name
Address
Read/Write
Page
SCSI Test Three (STEST3)
0x4F (0xCF)
Read/Write
5-65
SCSI Test Two (STEST2)
0x4E (0xCE)
Read/Write
5-64
SCSI Test Zero (STEST0)
0x4C (0xCC)
Read Only
5-62
SCSI Timer One (STIME1)
0x49 (0xC9)
Read/Write
5-61
SCSI Timer Zero (STIME0)
0x48 (0xC8)
Read/Write
5-59
SCSI Transfer (SXFER)
0x05 (0x85)
Read/Write
5-13
Temporary (TEMP)
0x1C–0x1F (0x9C–0x9F)
Read/Write
5-34
A-4
Register Summary
Index
Symbols
benefits summary 1-3
BF bit 6-22, 6-45
bidirectional 5-3
BL[1:0] bits 6-42
block move Instructions 7-5
BO[6:0] bits 6-35
BOF bit 6-44
BSY bit 6-19, 6-21
burst disable bit 6-36
burst length bits 6-42
burst mode fetch enable bit 6-44
bus command and byte enables 5-6
bus fault bit 6-22, 6-45
byte
empty in DMA FIFO (FMT) 6-31
byte empty in DMA FIFO bits 6-31
byte full in DMA FIFO bits 6-31
byte offset counter bits 6-35
(AD[31:0]) 5-6
(BARO[31:0]) 3-17
(BARZ[31:0]) 3-17
(CLS[7:0]) 3-15
(FMT) 6-31
(HT[7:0]) 3-16
(IL[7:0]) 3-17
(IP[7:0]) 3-18
(LT[7:0]) 3-16
(MG[7:0]) 3-18
(ML[7:0]) 3-19
Numerics
3.3/5 volt PCI interface 2-6
3-state 5-3
C
A
abort operation bit 6-27
aborted bit 6-22, 6-45
ABRT bit 6-22, 6-27, 6-45
AC characteristics 8-10
ACK bit 6-19, 6-21
active negation. See TolerANT
ADCK bit 6-37
ADDER register 6-48
adder sum output register 6-48
AIP bit 6-24
arbitration in progress bit 6-24
arbitration priority encoder test bit 6-62
ART bit 6-62
assert SCSI ACK bit 6-19
assert SCSI ATN/ bit 6-19
assert SCSI BSY/ bit 6-19
assert SCSI C_D/ bit 6-19
assert SCSI I_O/ bit 6-19
assert SCSI MSG/ bit 6-19
assert SCSI REQ/ signal bit 6-19
assert SCSI SEL/ bit 6-19
ATN bit 6-19
B
base address register
one (BARO[31:0]) 3-17
zero - I/O (BARZ[31:0]) 3-17
BBCK bit 6-38
BDIS bit 6-36
C_BE/[3:0] 5-6
C_D bit 6-19, 6-21, 6-26
cache line size
(CLS[7:0]) 3-15
cache line size enable bit 6-46
cache mode, see PCI cache mode 3-3
chip revision level bits 6-33
chip test five register 6-37
chip test four register 6-36
chip test one register 6-31
chip test six register 6-38
chip test two register 6-32
chip test zero register 6-31
chip type bits 6-57
clear SCSI FIFO bit 6-67
CLK 5-5
clock 5-5
clock address incrementor bit 6-37
clock byte counter bit 6-38
CLSE bit 6-46
CM bit 6-32
CMP bit 6-49, 6-52
COM bit 6-48
CON bit 6-29
configuration registers. See PCI configuration registers
configured as memory bit 6-32
connected bit 6-29
CSF bit 6-67
CTEST0 register 6-31
CTEST1 register 6-31
LSI53C860 PCI to Ultra SCSI I/O Processor
IX-1
CTEST2 register
CTEST4 register
CTEST5 register
CTEST6 register
cycle frame 5-7
6-32
6-36
6-37
6-38
ERL bit 6-43
EXT bit 6-64
extend SREQ/SACK filtering bit 6-64
F
D
DACK bit 6-33
Data acknowledge status bit 6-33
data path 2-9
Data request status bit 6-33
data structure address register 6-27
data transfer direction bit 6-32
dataRD bit 6-57
dataWR bit
DWR bit 6-57
DBC register 6-39
DCMD register 6-40
DCNTL register 6-46
DDIR bit 6-32, 6-38
destination I/O-memory enable bit 6-43
determining the data transfer rate 2-14
device select 5-7
DEVSEL/ 5-7
DF[7:0] bits 6-38
DFE bit 6-22
DFIFO register 6-35
DIEN register 6-44
DIFFSENS SCSI signal 8-3
DIOM bit 6-43
disable single initiator response bit 6-66
DMA byte counter register 6-39
DMA command register 6-40
DMA control register 6-46
DMA core 2-2
DMA direction bit 6-38
DMA FIFO 2-9
DMA FIFO bits 6-38
DMA FIFO empty bit 6-22
DMA FIFO register 6-35
DMA interrupt enable register 6-44
DMA mode register 6-42
DMA next address register 6-40
DMA SCRIPTS pointer register 6-41
DMA SCRIPTS pointer save register 6-41
DMA status register 6-21
DMODE register 6-42
DNAD register 6-40
DRD bit 6-57
DREQ bit 6-33
DSA register 6-27
DSI bit 6-66
DSP register 6-41
DSPS register 6-41
DSTAT register 6-21
E
ease of use 1-5
enable read line bit 6-43
enable read multiple bit 6-44
enable response to reselection bit 6-12
enable response to selection bit 6-12
encoded chip SCSI ID, bits[2:0] 6-13
encoded destination SCSI ID bits 6-16, 6-20
IX-2
Index
FBL[2:0] bits 6-37
fetch enable bit 6-58
fetch opcode bursting 2-5
FFL[3:0] bits 6-31
FIFO byte control bits 6-37
FMT[3:0] bits 6-31
FRAME/ 5-7
full arbitration, selection/reselection 6-4
function complete bit 6-49, 6-52
G
GEN bit 6-51, 6-55
GEN[3:0] bits 6-61
general purpose pin control register 6-58
general purpose register 6-17
general purpose timer expired bit 6-51, 6-55
general purpose timer period bits 6-61
GNT/ 5-8
GPCNTL register 6-58
GPIO enable bits 6-58
GPIO[1:0] bits 6-58
GPREG register 6-17
grant 5-8
H
halt SCSI clock bit
HSC bit 6-66
handshake-to-handshake timer expired bit 6-51, 6-55
header type (HT[7:0]) 3-16
high impedance mode bit 6-36
HTH bit 6-51, 6-55
I
I/O bit 6-26
I/O instructions 7-13
I_O bit 6-19
IDSEL 5-7
IID bit 6-45
illegal instruction detected bit 6-45
initialization device select 5-7
initiator ready 5-7
input 5-3
instruction prefetch. See SCRIPTS instruction prefetching
instruction set 7-1 to 7-42
instructions
block move 7-5
I/O 7-13
load and store 7-39
memory move 7-35
read/write 7-22
transfer control 7-27
interrupt
line 3-17
pin (IP[7:0]) 3-18
interrupt output timings 8-11
interrupt status register 6-27
interrupt-on-the-fly bit 6-29
interrupts
fatal vs. nonfatal interrupts 2-18
halting 2-21
IRQ disable bit 2-17, 6-47
masking 2-19
polling vs. hardware 2-16
registers 2-16
stacked interrupts 2-19
INTF bit 6-29
IRDY/ 5-7
IRQ disable bit 6-47
IRQ mode bit 6-47
IRQD bit 6-47
IRQM bit 6-47
ISTAT register 6-27
L
last disconnect bit 6-26
latched SCSI parity bit 6-25
latency
timer (LT[7:0]) 3-16
LDSC bit 6-26
load and store instructions 7-39
no flush option 7-40
prefetch unit and store instructions 2-4, 7-41
LOW bit 6-65
LSI53C700 family compatibility bit 6-48
LSI53C810A
ease of use 1-5
LSI53C860
ease of use 1-5
flexibility 1-5
integration 1-5
performance 1-4
testability 1-7
M
M/A bit 6-49
MACNTL register 6-57
MAN bit 6-44
manual start mode bit 6-44
MASR bit 6-38
master control for set or reset pulses bit 6-38
master data parity error bit 6-22
MDPE bit 6-45
master enable bit 6-58
master parity error enable bit 6-37
max SCSI synchronous offset bits 6-15
max_lat (ML[7:0]) 3-19
MDPE bit 6-22
memory access control register 6-57
memory move instructions 7-35
and SCRIPTS instruction prefetching 2-4
no flush option 7-38
memory read line command 3-6
memory read multiple command 3-7
memory write and invalidate command 3-5
write and invalidate mode bit 3-12
min_gnt (MG[7:0]) 3-18
move to/from SFBR cycles 7-23
MPEE bit 6-37
MSG bit 6-19, 6-21, 6-26
Index
N
NFMMOV instruction 7-38
no flush memory-to-memory move 7-38
O
OLF bit 6-24
opcode fetch bursting 2-5
operating registers
adder sum output 6-48
chip test five 6-37
chip test four 6-36
chip test one 6-31
chip test six 6-38
chip test three 6-33
chip test two 6-32
chip test zero 6-31
data structure address 6-27
DMA byte counter 6-39
DMA command 6-40
DMA control 6-46
DMA FIFO 6-35
DMA interrupt enable 6-44
DMA mode 6-42
DMA next address 6-40
DMA SCRIPTS pointer 6-41
DMA SCRIPTS pointer save 6-41
DMA status 6-21
general purpose 6-17
general purpose pin control 6-58
interrupt status 6-27
memory access control 6-57
response ID zero 6-61
scratch register A 6-42
scratch register B 6-69
SCSI bus control lines 6-21
SCSI bus data lines 6-68
SCSI chip ID 6-12
SCSI destination ID 6-16
SCSI first byte received 6-18
SCSI input data latch 6-67
SCSI interrupt enable one 6-51
SCSI interrupt enable zero 6-48
SCSI interrupt status one 6-54
SCSI interrupt status zero 6-52
SCSI longitudinal parity 6-55
SCSI output control latch 6-19
SCSI output data latch 6-68
SCSI selector ID 6-20
SCSI Status One 6-25
SCSI status two 6-26
SCSI status zero 6-23
SCSI test one 6-63
SCSI test three 6-65
SCSI test two 6-64
SCSI test zero 6-62
SCSI timer one 6-61
SCSI timer zero 6-59
SCSI transfer 6-13
temporary stack 6-34
ORF bit 6-23
IX-3
P
PAR 5-6
PAR bit 6-50, 6-54
parity 2-6 to 2-8, 5-6
master data parity error bit 6-45
master parity error enable bit 6-37
parity error bit 6-54
SCSI parity error bit 6-50
parity error 5-8
parity error bit 6-54
PCI
addressing 3-1
bus commands and functions supported 3-2
PCI addressing 3-1
PCI bus commands and functions supported 3-2
PCI cache mode 2-5, 3-3
cache line size enable bit 6-46
enable read line bit 6-43
enable read multiple bit 6-44
memory read line command 3-6
memory read multiple command 3-7
memory write and invalidate command 3-5
write and invalidate mode bit 3-12
write and invalidate enable bit 6-34
PCI commands 3-2
PCI configuration registers 3-9, 3-18
command 3-11
device ID 3-11
status 3-13
vendor ID 3-11
PCI configuration space 3-1
PCI I/O space 3-2
PCI memory space 3-2
PERR/ 5-8
PFEN bit 6-46
PFF bit 6-46
physical dword address and data 5-6
pointer SCRIPTS bit
PSCPT bit 6-57
prefetch enable bit 6-46
prefetch flush bit 6-46
prefetching
prefetching. See SCRIPTS instruction
R
read multiple commands
enable read multiple bit 6-44
read/write instructions 7-22
register addresses
operating registers
0x04 6-12
0x06 6-16
0x07 6-17
0x08 6-18
0x09 6-19
0x0A 6-20
0x0B 6-21
0x0C 6-21
0x0D 6-23
0x0E 6-25
0x0F 6-26
0x10–0x13 6-27
0x14 6-27
0x18 6-31
IX-4
Index
0x19 6-31
0x1A 6-32
0x1C–0x1F 6-34
0x20 6-35
0x21 6-36
0x22 6-37
0x23 6-38
0x24h–0x26 6-39
0x27 6-40
0x28–0x2B 6-40
0x2C–0x2F 6-41
0x30–0x33 6-41
0x34–0x37 6-42
0x38 6-42
0x39 6-44
0x3B 6-46
0x3C–0x3F 6-48
0x40 6-48
0x41 6-51
0x42 6-52
0x43 6-54
0x44 6-55
0x46 6-57
0x47 6-58
0x48 6-59
0x49 6-61
0x4A 6-61
0x4C 6-62
0x4D 6-63
0x4E 6-64
0x4F 6-65
0x50 6-67
0x54 6-68
0x58 6-68
0x5C–0x5F 6-69
PCI configuration registers
0x00 3-11
0x02 3-11
0x04 3-11
0x06 3-13
register bits
abort operation 6-27
aborted 6-22, 6-45
arbitration in progress 6-24
arbitration priority encoder test 6-62
assert SCSI ACK 6-19
assert SCSI ATN/ 6-19
assert SCSI BSY/ 6-19
assert SCSI C_D/ 6-19
assert SCSI I_O/ 6-19
assert SCSI MSG/ 6-19
assert SCSI REQ/ signal 6-19
assert SCSI SEL/ 6-19
burst disable 6-36
burst length 6-42
burst mode fetch enable 6-44
bus fault 6-45
byte empty in DMA FIFO 6-31
byte full in DMA FIFO 6-31
byte offset counter 6-35
cache line size enable 6-46
chip revision level 6-33
chip type 6-57
clear DMA FIFO 6-33
clear SCSI FIFO 6-67
clock address incrementor 6-37
register bits (Cont.)
clock byte counter 6-38
configured as memory 6-32
connected 6-29
DACK 6-33
data transfer direction 6-32
dataRD 6-57
dataWR 6-57
destination I/O-memory enable 6-43
disable single initiator response 6-66
DMA direction 6-38
DMA FIFO 6-38
DMA FIFO empty bit 6-22
DREQ 6-33
enable read line 6-43
enable read multiple 6-44
enable response to reselection 6-12
enable response to selection 6-12
encoded chip SCSI ID, bits[2:0] 6-13
encoded destination ID 6-16
encoded destination SCSI ID 6-20
extend SREQ/SACK filtering 6-64
fetch enable 6-58
fetch pin mode 6-34
FIFO byte control 6-37
flush DMA FIFO 6-33
function complete 6-49, 6-52
general purpose timer expired 6-51, 6-55
general purpose timer period 6-61
GPIO enable 6-58
GPIO[1:0] 6-17
halt SCSI clock 6-66
handshake-to-handshake timer expired 6-51, 6-55
high impedance mode 6-36
illegal instruction detected 6-45
interrupt-on-the-fly 6-29
IRQ disable 6-47
IRQ mode 6-47
last disconnect 6-26
latched SCSI parity 6-25
LSI53C700 family compatibility 6-48
manual start mode 6-44
master control for set or reset pulses 6-38
master data parity error 6-22, 6-45
master enable 6-58
master parity error enable 6-37
max SCSI synchronous offset 6-15
parity error 6-54
pointer SCRIPTS 6-57
prefetch enable 6-46
prefetch flush 6-46
reselected 6-53
reset SCSI offset 6-64
SACK/ status 6-21
SATN/ status 6-21
SBSY/ status 6-21
SC_D/ status 6-21
SCLK 6-63
SCRIPTS 6-57
SCSI C_D/ signal 6-26
SCSI Data high impedance 6-36
SCSI FIFO test read 6-66
SCSI FIFO test write 6-67
SCSI gross error 6-49, 6-53
SCSI high impedance mode 6-64
SCSI I_O/ signal 6-26
Index
SCSI interrupt pending 6-29
SCSI isolation 6-63
SCSI loopback mode 6-64
SCSI low level mode 6-65
SCSI MSG/ signal 6-26
SCSI parity error 6-50
SCSI phase mismatch or SCSI ATN condition 6-49
SCSI RST/ signal 6-24
SCSI selected as ID 6-62
SCSI synchronous offset maximum 6-63
SCSI synchronous offset zero 6-62
SCSI synchronous transfer period 6-13
SCSI true end of process 6-32
SCSI valid 6-20
selected 6-49, 6-53
selection or reselection time-out 6-51, 6-55
selection response logic test 6-62
selection time-out 6-60
semaphore 6-28
shadow register test mode 6-36
SI_O/ status 6-21
SIDL full 6-23
signal process 6-32
single step interrupt 6-22, 6-45
single-step mode 6-47
SMSG/ status 6-21
SODL full 6-24
SODR full 6-23
software reset 6-28
source I/O-memory enable 6-43
SREQ/ status 6-21
SSEL/ status 6-21
start DMA operation 6-47
unexpected disconnect 6-50, 6-53
won arbitration 6-24
write and invalidate enable 6-34
REQ bit 6-19, 6-21
REQ/ 5-8
request 5-8
reselect
during reselection 2-12
response to 2-12
reselected bit 6-53
reset 5-5
reset SCSI offset bit 6-64
RESPID0 register 6-61
response ID zero register 6-61
revision level bits 6-33
ROF bit 6-64
RRE bit 6-12
RSL bit 6-53
RST/ 5-5
RST/ bit 6-24
S
SACK/ 5-9
SACK/ status bit 6-21
SAT bit 6-21
SATN/ 5-9
SATN/ status bit 6-21
SBCL register 6-21
SBDL register 6-68
SBSY/ 5-9
SBSY/ status bit 6-21
SC_D/ status bit 6-21
IX-5
SCD/ 5-9
SCF[2:0] bits 6-10
SCID register 6-12
SCLK 5-9
SCLK bit 6-63
SCPTS bit 6-57
SCRATCHA register 6-42
SCRATCHB register 6-69
SCRIPTS
sample operation 7-3
SCRIPTS bit 6-57
SCRIPTS instruction prefetching
no flush memory move instruction 7-38
prefetch enable bit 6-46
prefetch flush bit 6-46
SCRIPTS processor 2-2
performance 2-2
SCSI
termination 2-12
SCSI ATN condition - target mode 6-49
SCSI bus control lines register 6-21
SCSI bus data lines register 6-68
SCSI bus interface 2-11 to 2-12
SCSI C_D/ signal 6-26
SCSI chip ID register 6-12
SCSI clock 5-9
SCSI control 5-9
SCSI core 2-1
SCSI data high impedance bit 6-36
SCSI destination ID register 6-16
SCSI FIFO test read bit 6-66
SCSI FIFO test write bit 6-67
SCSI first byte received register 6-18
SCSI gross error bit 6-49, 6-53
SCSI high impedance mode bit 6-64
SCSI I_O/ bit 6-26
SCSI input data latch register 6-67
SCSI instructions
block move 7-5
I/O 7-13
load/store 7-39
memory move 7-35
read/write 7-22
SCSI interrupt enable one register 6-51
SCSI interrupt enable zero register 6-48
SCSI interrupt pending bit 6-29
SCSI interrupt status one register 6-54
SCSI interrupt status zero register 6-52
SCSI isolation bit 6-63
SCSI longitudinal parity register 6-55
SCSI loopback mode bit 6-64
SCSI low level mode 6-65
SCSI MSG/ bit 6-26
SCSI output control latch register 6-19
SCSI output data latch register 6-68
SCSI parity error bit 6-50
SCSI phase mismatch - initiator mode bit 6-49
SCSI RST/ signal bit 6-24
SCSI SCRIPTS operation 7-2
SCSI selected as ID bits 6-62
SCSI selector ID register 6-20
SCSI status one register 6-25
SCSI status two register 6-26
SCSI status zero register 6-23
SCSI synchronous offset maximum bit 6-63
SCSI synchronous offset zero bit 6-62
IX-6
Index
SCSI synchronous transfer period bits 6-13
SCSI test one register 6-63
SCSI test three register 6-65
SCSI test two register 6-64
SCSI test zero register 6-62
SCSI timer one register 6-61
SCSI timer zero register 6-59
SCSI timings 8-26
SCSI true end of process bit 6-32
SCSI valid Bit 6-20
SCTRL/ 5-9
SD/[15:0] 5-9
SDID register 6-16
SDP/[1:0] 5-9
SDPL bit 6-25
SEL bit 6-19, 6-21, 6-49, 6-53
SEL bits 6-60
selected bit 6-49, 6-53
selection
during reselection 2-12
during selection 2-12
response to 2-12
selection or reselection time-out bit 6-51
STO bit 6-55
selection response logic test bit 6-62
selection time-out bits 6-60
SEM bit 6-28
semaphore bit 6-28
SERR/ 5-8
SFBR register 6-18
SGE bit 6-49, 6-53
shadow register test mode bit 6-36
SI_O bit 6-21
SI_O/ status bit 6-21
SIDL bit 6-23
SIDL least significant byte full bit 6-23
SIDL register 6-67
SIEN0 register 6-48
SIEN1 register 6-51
signal process bit 6-32
SIGP bit 6-32
single step interrupt bit 6-22, 6-45
single-ended operation 2-11
single-step mode bit 6-47
SIO/ 5-9
SIOM bit 6-43
SIP bit 6-29
SISO bit 6-63
SIST0 register 6-52
SIST1 register 6-54
SLB bit 6-64
SLPAR register 6-55
SLT bit 6-62
SMSG/ 5-9
SMSG/ status bit 6-21
SOCL register 6-19
SODL least significant byte full bit 6-24
SODL register 6-68
SODR least significant byte full bit 6-23
software reset bit 6-28
SOM bit 6-63
source I/O-memory enable bit 6-43
SOZ bit 6-62
SRE bit 6-12
SREQ/ 5-9
SREQ/ status bit 6-21
SRST bit 6-28
SRST/ 5-9
SRTM bit 6-36
SSAID bits 6-62
SSEL/ 5-9
SSEL/ status bit 6-21
SSI bit 6-22, 6-45
SSID register 6-20
SSM bit 6-47
SSTAT0 register 6-23
SSTAT1 register 6-25
SSTAT2 register 6-26
stacked interrupts 2-19
start DMA operation bit 6-47
STD bit 6-47
STEST0 register 6-62
STEST1 register 6-63
STEST2 register 6-64
STEST3 register 6-65
STIME0 register 6-59
STIME1 register 6-61
STO bit 6-51
stop 5-7
Storage Device Management System (SDMS) 2-3
STR bit 6-66
STW bit 6-67
synchronous clock conversion factor bits 6-10
synchronous data transfer rate 2-14
synchronous operation 2-13
SZM bit 6-64
V
VAL bit 6-20
VDD 5-3
VDD-C 5-3
VSS 5-3
VSS-C 5-3
VSS-S 5-3
W
WOA bit 6-24
won arbitration bit 6-24
write and invalidate command
write and invalidate enable bit 6-34
Z
ZMOD bit 6-36
ZSD bit 6-36
T
target ready 5-7
TE bit 6-65
TEMP register 6-34
temporary register 6-34
TEOP bit 6-32
termination 2-12
timer test mode bit 6-66
timing diagrams 8-12 to 8-28
interrupt output 8-11
PCI interface 8-25
SCSI timings 8-26
timings
PCI 8-25
SCSI 8-26
TolerANT 1-2
extend SREQ/SACK filtering bit 6-64
TolerANT enable bit 6-65
TolerANT enable bit 6-65
totem pole output 5-3
TP[2:0] bits 6-13
transfer control instructions 7-27
prefetch unit flushing 2-4
transfer rate 1-4
synchronous 2-14
TRDY/ 5-7
TTM bit 6-66
TYP[3:0] bits 6-57
U
UDC bit 6-50, 6-53
Ultra SCSI
SCSI termination requirements 2-12
synchronous clock conversion factor bits 6-10
unexpected disconnect bit 6-50, 6-53
Index
IX-7
IX-8
Index
Customer Feedback
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Name
Telephone
Title
Department
Company Name
Street
City, State, Zip
Customer Feedback
Date
Fax
Mail Stop
U.S. Distributors
by State
A. E.
Avnet Electronics
http://www.hh.avnet.com
B. M.
Bell Microproducts,
Inc. (for HAB’s)
http://www.bellmicro.com
I. E.
Insight Electronics
http://www.insight-electronics.com
W. E.
Wyle Electronics
http://www.wyle.com
Alabama
Daphne
I. E.
Tel: 334.626.6190
Huntsville
A. E.
Tel: 256.837.8700
I. E.
Tel: 256.830.1222
W. E. Tel: 800.964.9953
Alaska
A. E.
Tel: 800.332.8638
Arkansas
W. E. Tel: 972.235.9953
Arizona
Phoenix
A. E.
Tel: 480.736.7000
B. M.
Tel: 602.267.9551
W. E. Tel: 800.528.4040
Tempe
I. E.
Tel: 480.829.1800
Tucson
A. E.
Tel: 520.742.0515
California
Agoura Hills
B. M.
Tel: 818.865.0266
Irvine
A. E.
Tel: 949.789.4100
B. M.
Tel: 949.470.2900
I. E.
Tel: 949.727.3291
W. E. Tel: 800.626.9953
Los Angeles
A. E.
Tel: 818.594.0404
W. E. Tel: 800.288.9953
Sacramento
A. E.
Tel: 916.632.4500
W. E. Tel: 800.627.9953
San Diego
A. E.
Tel: 858.385.7500
B. M.
Tel: 858.597.3010
I. E.
Tel: 800.677.6011
W. E. Tel: 800.829.9953
San Jose
A. E.
Tel: 408.435.3500
B. M.
Tel: 408.436.0881
I. E.
Tel: 408.952.7000
Santa Clara
W. E. Tel: 800.866.9953
Woodland Hills
A. E.
Tel: 818.594.0404
Westlake Village
I. E.
Tel: 818.707.2101
Colorado
Denver
A. E.
Tel: 303.790.1662
B. M.
Tel: 303.846.3065
W. E. Tel: 800.933.9953
Englewood
I. E.
Tel: 303.649.1800
Connecticut
Cheshire
A. E.
Tel: 203.271.5700
I. E.
Tel: 203.272.5843
Wallingford
W. E. Tel: 800.605.9953
Delaware
North/South
A. E.
Tel: 800.526.4812
Tel: 800.638.5988
B. M.
Tel: 302.328.8968
W. E. Tel: 856.439.9110
Florida
Altamonte Springs
B. M.
Tel: 407.682.1199
I. E.
Tel: 407.834.6310
Boca Raton
I. E.
Tel: 561.997.2540
Clearwater
I. E.
Tel: 727.524.8850
Fort Lauderdale
A. E.
Tel: 954.484.5482
W. E. Tel: 800.568.9953
Miami
B. M.
Tel: 305.477.6406
Orlando
A. E.
Tel: 407.657.3300
W. E. Tel: 407.740.7450
Tampa
W. E. Tel: 800.395.9953
St. Petersburg
A. E.
Tel: 727.507.5000
Georgia
Atlanta
A. E.
Tel: 770.623.4400
B. M.
Tel: 770.980.4922
W. E. Tel: 800.876.9953
Duluth
I. E.
Tel: 678.584.0812
Hawaii
A. E.
Tel: 800.851.2282
Idaho
A. E.
W. E.
Tel: 801.365.3800
Tel: 801.974.9953
Illinois
North/South
A. E.
Tel: 847.797.7300
Tel: 314.291.5350
Chicago
B. M.
Tel: 847.413.8530
W. E. Tel: 800.853.9953
Schaumburg
I. E.
Tel: 847.885.9700
Indiana
Fort Wayne
I. E.
Tel: 219.436.4250
W. E. Tel: 888.358.9953
Indianapolis
A. E.
Tel: 317.575.3500
Iowa
W. E. Tel: 612.853.2280
Cedar Rapids
A. E.
Tel: 319.393.0033
Kansas
W. E. Tel: 303.457.9953
Kansas City
A. E.
Tel: 913.663.7900
Lenexa
I. E.
Tel: 913.492.0408
Kentucky
W. E. Tel: 937.436.9953
Central/Northern/ Western
A. E.
Tel: 800.984.9503
Tel: 800.767.0329
Tel: 800.829.0146
Louisiana
W. E. Tel: 713.854.9953
North/South
A. E.
Tel: 800.231.0253
Tel: 800.231.5575
Maine
A. E.
W. E.
Tel: 800.272.9255
Tel: 781.271.9953
Maryland
Baltimore
A. E.
Tel: 410.720.3400
W. E. Tel: 800.863.9953
Columbia
B. M.
Tel: 800.673.7461
I. E.
Tel: 410.381.3131
Massachusetts
Boston
A. E.
Tel: 978.532.9808
W. E. Tel: 800.444.9953
Burlingtonr
I. E.
Tel: 781.270.9400
Marlborough
B. M.
Tel: 508.480.9099
Woburn
B. M.
Tel: 781.933.9010
Michigan
Brighton
I. E.
Tel: 810.229.7710
Detroit
A. E.
Tel: 734.416.5800
W. E. Tel: 888.318.9953
Minnesota
Champlin
B. M.
Tel: 800.557.2566
Eden Prairie
B. M.
Tel: 800.255.1469
Minneapolis
A. E.
Tel: 612.346.3000
W. E. Tel: 800.860.9953
St. Louis Park
I. E.
Tel: 612.525.9999
Mississippi
A. E.
Tel: 800.633.2918
W. E. Tel: 256.830.1119
Missouri
W. E. Tel: 630.620.0969
St. Louis
A. E.
Tel: 314.291.5350
I. E.
Tel: 314.872.2182
Montana
A. E.
Tel: 800.526.1741
W. E. Tel: 801.974.9953
Nebraska
A. E.
Tel: 800.332.4375
W. E. Tel: 303.457.9953
Nevada
Las Vegas
A. E.
Tel: 800.528.8471
W. E. Tel: 702.765.7117
New Hampshire
A. E.
Tel: 800.272.9255
W. E. Tel: 781.271.9953
New Jersey
North/South
A. E.
Tel: 201.515.1641
Tel: 609.222.6400
Mt. Laurel
I. E.
Tel: 609.222.9566
Pine Brook
W. E. Tel: 800.862.9953
Parsippany
I. E.
Tel: 973.299.4425
Wayne
W. E. Tel: 973.237.9010
New Mexico
W. E. Tel: 480.804.7000
Albuquerque
A. E.
Tel: 505.293.5119
U.S. Distributors
by State
(Continued)
New York
Hauppauge
I. E.
Tel: 516.761.0960
Long Island
A. E.
Tel: 516.434.7400
W. E. Tel: 800.861.9953
Rochester
A. E.
Tel: 716.475.9130
I. E.
Tel: 716.242.7790
W. E. Tel: 800.319.9953
Smithtown
B. M.
Tel: 800.543.2008
Syracuse
A. E.
Tel: 315.449.4927
North Carolina
Raleigh
A. E.
Tel: 919.859.9159
I. E.
Tel: 919.873.9922
W. E. Tel: 800.560.9953
North Dakota
A. E.
Tel: 800.829.0116
W. E. Tel: 612.853.2280
Ohio
Cleveland
A. E.
Tel: 216.498.1100
W. E. Tel: 800.763.9953
Dayton
A. E.
Tel: 614.888.3313
I. E.
Tel: 937.253.7501
W. E. Tel: 800.575.9953
Strongsville
B. M.
Tel: 440.238.0404
Valley View
I. E.
Tel: 216.520.4333
Oklahoma
W. E. Tel: 972.235.9953
Tulsa
A. E.
Tel: 918.459.6000
I. E.
Tel: 918.665.4664
Oregon
Beavertonr
B. M.
Tel: 503.524.0787
I. E.
Tel: 503.644.3300
Portland
A. E.
Tel: 503.526.6200
W. E. Tel: 800.879.9953
Pennsylvania
Mercer
I. E.
Tel: 412.662.2707
Pittsburgh
A. E.
Tel: 412.281.4150
W. E. Tel: 440.248.9996
Philadelphia
A. E.
Tel: 800.526.4812
B. M.
Tel: 215.741.4080
W. E. Tel: 800.871.9953
Rhode Island
A. E.
800.272.9255
W. E. Tel: 781.271.9953
South Carolina
A. E.
Tel: 919.872.0712
W. E. Tel: 919.469.1502
South Dakota
A. E.
Tel: 800.829.0116
W. E. Tel: 612.853.2280
Tennessee
W. E. Tel: 256.830.1119
East/West
A. E.
Tel: 800.241.8182
Tel: 800.633.2918
Texas
Austin
A. E.
Tel: 512.219.3700
B. M.
Tel: 512.258.0725
I. E.
Tel: 512.719.3090
W. E. Tel: 800.365.9953
Dallas
A. E.
Tel: 214.553.4300
B. M.
Tel: 972.783.4191
W. E. Tel: 800.955.9953
El Paso
A. E.
Tel: 800.526.9238
Houston
A. E.
Tel: 713.781.6100
B. M.
Tel: 713.917.0663
W. E. Tel: 800.888.9953
Richardson
I. E.
Tel: 972.783.0800
Rio Grande Valley
A. E.
Tel: 210.412.2047
Stafford
I. E.
Tel: 281.277.8200
Utah
Centerville
B. M.
Tel: 801.295.3900
Murray
I. E.
Tel: 801.288.9001
Salt Lake City
A. E.
Tel: 801.365.3800
W. E. Tel: 800.477.9953
Vermont
A. E.
Tel: 800.272.9255
W. E. Tel: 716.334.5970
Virginia
A. E.
Tel: 800.638.5988
W. E. Tel: 301.604.8488
Washington
Kirkland
I. E.
Tel: 425.820.8100
Seattle
A. E.
Tel: 425.882.7000
W. E. Tel: 800.248.9953
West Virginia
A. E.
Tel: 800.638.5988
Wisconsin
Milwaukee
A. E.
Tel: 414.513.1500
W. E. Tel: 800.867.9953
Wauwatosa
I. E.
Tel: 414.258.5338
Wyoming
A. E.
Tel: 800.332.9326
W. E. Tel: 801.974.9953
Direct Sales
Representatives by State
(Component and Boards)
E. A.
E. L.
GRP
I. S.
ION
R. A.
SGY
Earle Associates
Electrodyne - UT
Group 2000
Infinity Sales, Inc.
ION Associates, Inc.
Rathsburg Associates, Inc.
Synergy Associates,
Inc.
Arizona
Tempe
E. A.
Tel: 480.921.3305
California
Calabasas
I. S.
Tel: 818.880.6480
Irvine
I. S.
Tel: 714.833.0300
San Diego
E. A.
Tel: 619.278.5441
Illinois
Elmhurst
R. A.
Tel: 630.516.8400
Indiana
Cicero
R. A.
Tel: 317.984.8608
Ligonier
R. A.
Tel: 219.894.3184
Plainfield
R. A.
Tel: 317.838.0360
Massachusetts
Burlington
SGY
Tel: 781.238.0870
Michigan
Byron Center
R. A.
Tel: 616.554.1460
Good Rich
R. A.
Tel: 810.636.6060
Novi
R. A.
Tel: 810.615.4000
North Carolina
Cary
GRP
Tel: 919.481.1530
Ohio
Columbus
R. A.
Tel: 614.457.2242
Dayton
R. A.
Tel: 513.291.4001
Independence
R. A.
Tel: 216.447.8825
Pennsylvania
Somerset
R. A.
Tel: 814.445.6976
Texas
Austin
ION
Tel: 512.794.9006
Arlington
ION
Tel: 817.695.8000
Houston
ION
Tel: 281.376.2000
Utah
Salt Lake City
E. L.
Tel: 801.264.8050
Wisconsin
Muskego
R. A.
Tel: 414.679.8250
Saukville
R. A.
Tel: 414.268.1152
Sales Offices and Design
Resource Centers
LSI Logic Corporation
Corporate Headquarters
Tel: 408.433.8000
Fax: 408.433.8989
NORTH AMERICA
California
Costa Mesa - Mint Technology
Tel: 949.752.6468
Fax: 949.752.6868
Irvine
♦ Tel: 949.809.4600
Fax: 949.809.4444
Pleasanton Design Center
Tel: 925.730.8800
Fax: 925.730.8700
San Diego
Tel: 858.467.6981
Fax: 858.496.0548
Silicon Valley
♦ Tel: 408.433.8000
Fax: 408.954.3353
Wireless Design Center
Tel: 858.350.5560
Fax: 858.350.0171
Colorado
Boulder
♦ Tel: 303.447.3800
Fax: 303.541.0641
Colorado Springs
Tel: 719.533.7000
Fax: 719.533.7020
Fort Collins
Tel: 970.223.5100
Fax: 970.206.5549
Florida
Boca Raton
Tel: 561.989.3236
Fax: 561.989.3237
Georgia
Alpharetta
Tel: 770.753.6146
Fax: 770.753.6147
Illinois
Oakbrook Terrace
Tel: 630.954.2234
Fax: 630.954.2235
Kentucky
Bowling Green
Tel: 270.793.0010
Fax: 270.793.0040
Maryland
Bethesda
Tel: 301.897.5800
Fax: 301.897.8389
Massachusetts
Waltham
♦ Tel: 781.890.0180
Fax: 781.890.6158
Burlington - Mint Technology
Tel: 781.685.3800
Fax: 781.685.3801
Minnesota
Minneapolis
♦ Tel: 612.921.8300
Fax: 612.921.8399
New Jersey
Red Bank
Tel: 732.933.2656
Fax: 732.933.2643
Cherry Hill - Mint Technology
Tel: 609.489.5530
Fax: 609.489.5531
New York
Fairport
Tel: 716.218.0020
Fax: 716.218.9010
North Carolina
Raleigh
Tel: 919.785.4520
Fax: 919.783.8909
Oregon
Beaverton
Tel: 503.645.0589
Fax: 503.645.6612
Texas
Austin
Tel: 512.388.7294
Fax: 512.388.4171
Plano
♦ Tel: 972.244.5000
Fax: 972.244.5001
Houston
Tel: 281.379.7800
Fax: 281.379.7818
Canada
Ontario
Ottawa
♦ Tel: 613.592.1263
Fax: 613.592.3253
INTERNATIONAL
France
Paris
LSI Logic S.A.
Immeuble Europa
♦ Tel: 33.1.34.63.13.13
Fax: 33.1.34.63.13.19
Germany
Munich
LSI Logic GmbH
♦ Tel: 49.89.4.58.33.0
Fax: 49.89.4.58.33.108
Stuttgart
Tel: 49.711.13.96.90
Fax: 49.711.86.61.428
Italy
Milano
LSI Logic S.P.A.
♦ Tel: 39.039.687371
Fax: 39.039.6057867
Japan
Tokyo
LSI Logic K.K.
♦ Tel: 81.3.5463.7821
Fax: 81.3.5463.7820
Osaka
♦ Tel: 81.6.947.5281
Fax: 81.6.947.5287
Korea
Seoul
LSI Logic Corporation of
Korea Ltd
Tel: 82.2.528.3400
Fax: 82.2.528.2250
The Netherlands
Eindhoven
LSI Logic Europe Ltd
Tel: 31.40.265.3580
Fax: 31.40.296.2109
Singapore
Singapore
LSI Logic Pte Ltd
Tel: 65.334.9061
Fax: 65.334.4749
Tel: 65.835.5040
Fax: 65.732.5047
Sweden
Stockholm
LSI Logic AB
♦ Tel: 46.8.444.15.00
Fax: 46.8.750.66.47
Taiwan
Taipei
LSI Logic Asia, Inc.
Taiwan Branch
Tel: 886.2.2718.7828
Fax: 886.2.2718.8869
United Kingdom
Bracknell
LSI Logic Europe Ltd
♦ Tel: 44.1344.426544
Fax: 44.1344.481039
♦ Sales Offices with
Design Resource Centers
International Distributors
Australia
New South Wales
Reptechnic Pty Ltd
♦ Tel: 612.9953.9844
Fax: 612.9953.9683
Belgium
Acal nv/sa
Tel: 32.2.7205983
Fax: 32.2.7251014
China
Beijing
LSI Logic International
Services Inc.
Tel: 86.10.6804.2534
Fax: 86.10.6804.2521
France
Rungis Cedex
Azzurri Technology France
Tel: 33.1.41806310
Fax: 33.1.41730340
Germany
Haar
EBV Elektronik
Tel: 49.89.4600980
Fax: 49.89.46009840
Munich
Avnet Emg GmbH
Tel: 49.89.45110102
Fax: 49.89.42.27.75
Wuennenberg-Haaren
Peacock AG
Tel: 49.2957.79.1692
Fax: 49.2957.79.9341
Hong Kong
Hong Kong
AVT Industrial Ltd
Tel: 852.2428.0008
Fax: 852.2401.2105
EastEle
Tel: 852.2798.8860
Fax: 852.2305.0640
India
Bangalore
Spike Technologies India
Private Ltd
♦ Tel: 91.80.664.5530
Fax: 91.80.664.9748
Israel
Tel Aviv
Eastronics Ltd
Tel: 972.3.6458777
Fax: 972.3.6458666
Japan
Tokyo
Global Electronics
Corporation
Tel: 81.3.3260.1411
Fax: 81.3.3260.7100
Technical Center
Tel: 81.471.43.8200
Yokohama-City
Macnica Corporation
Tel: 81.45.939.6140
Fax: 81.45.939.6141
The Netherlands
Eindhoven
Acal Nederland b.v.
Tel: 31.40.2.502602
Fax: 31.40.2.510255
Switzerland
Brugg
LSI Logic Sulzer AG
Tel: 41.32.3743232
Fax: 41.32.3743233
Taiwan
Taipei
Avnet-Mercuries
Corporation, Ltd
Tel: 886.2.2516.7303
Fax: 886.2.2505.7391
Lumax International
Corporation, Ltd
Tel: 886.2.2788.3656
Fax: 886.2.2788.3568
Prospect Technology
Corporation, Ltd
Tel: 886.2.2721.9533
Fax: 886.2.2773.3756
Serial Semiconductor
Corporation, Ltd
Tel: 886.2.2579.5858
Fax: 886.2.2570.3123
United Kingdom
Maidenhead
Azzurri Technology Ltd
Tel: 44.1628.826826
Fax: 44.1628.829730
Swindon
EBV Elektronik
Tel: 44.1793.849933
Fax: 44.1793.859555
♦ Sales Offices with
Design Resource Centers