Document Outline
- Front Cover
- Preface
- Revision Record
- Contents
- Chapter 1 Introduction
- General Description
- Application Examples
- Chapter 2 Functional Description
- Interface Signal Descriptions
- Chapter 3 Signal Descriptions
- SYM53C120 Pin Diagram
- SYM53C120 Signal Grouping
- SCSI A Interface Pins
- SCSI B Single-ended Interface Pins
- SCSI B Differential Interface Pins
- Control Interface Pins
- Chapter 4 Electrical Characteristics
- DC Characteristics
- TolerANT Technology Electrical Characteristics
- AC Characteristics
- Chapter 5 SYM20101/2 SCSI Bus Boards
- SYM20101/2 Circuit Board Description
- SYM20101 SCSI Bus Extender Board
- SYM20101 SCSI Bus Extender Board Installation Instructions
- SYM20102 SCSI Bus Converter Board
- SYM20102 SCSI Bus Converter Board Installation Instructions
- Appendix A Mechanical Drawings
- SYM53C120 Mechanical Drawing
- Appendix B Differential Wiring Diagram
- SYM53C120 Differential Wiring Diagram
- Glossary
- Index
- Symbios Logic Sales Locations
- Back Cover
PRELIMINARY
Data Manual and User's Guide
Version 3.0
SCSI Bus Expander Family
SYM53C120 SCSI Bus Expander
SYM20101 Extender Board
SYM20102 Converter Board
Supports Single-Ended(SE)-to-SE or
(SE)-to-Differential Modes
T14971I
A C T I V E N E G A T I O N T E C H N O L O G Y
I N C R E A S I N G S C S I R E L I A B I L I T Y
Toler
ANT
SCSI
SE-SE
The product described in this publication is a licensed product of Symbios Logic.
TolerANT is a registered trademark of Symbios Logic. Wolfpack is a registered trademark of
Microsoft Corporation.
It is the policy of Symbios Logic to improve products as new technology, components, software,
and firmware become available. Symbios Logic, therefore, reserves the right to change specifica-
tions without notice.
The products in this manual are not intended for use in life-support appliances, devices, or sys-
tems. Use of these products in such applications without the written consent of the appropriate
Symbios Logic officer is prohibited.
Copyright 1996-1997
By Symbios Logic
Fort Collins, Colorado U.S.A.
All Rights Reserved
Printed in U.S.A.
We use comments from our readers to improve Symbios Logic product literature.
Please e-mail any comments regarding technical documentation to pubs@symbios.com.
Preface
SYM53C120 Data Manual and SYM2010x Boards
i
PRELIMINARY
Preface
This manual provides description and electrical characteristics of the SYM53C120 SCSI Bus Expander chip which
supports single-ended to single-end SCSI bus expansion (Extender) or single-ended to differential SCSI bus conver-
sion (Converter). This manual also provides a description of and how to install the SYM20101 Extender board and
the SYM20102 Converter board. Both boards use the SYM53C120 SCSI Bus Expander chip.
This manual assumes some prior knowledge of current and proposed SCSI standards. For background information,
please contact:
ANSI
11 West 42nd Street
New York, NY 10036
(212) 642-4900
Ask for document number X3.131-1994 (SCSI-2) (SCSI-3)
Global Engineering Documents
15 Inverness Way East
Englewood, CO 80112
(800) 854-7179 or (303) 792-2181 (outside U.S.)
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
Prentice Hall
Englewood Cliffs, NJ 07632
(201) 767-5937
Ask for document number ISBN 0-13-796855-8, SCSI: Understanding the Small Computer System Interface
Symbios Logic Electronic Bulletin Board
(719) 573-3562
SCSI Electronic Bulletin Board
(719) 574-0424
Symbios Logic World Wide Web
http://www.symbios.com
(See EPI (Enhanced Parallel Interface) Specification for expander configurations)
Revision Record
ii
SYM53C120 Data Manual and SYM2010x Boards
PRELIMINARY
Revision Record
Page No.
Date
Version
Remarks
All
10/96
1.0
Preliminary Data Manual
All
11/96
2.0
Complete Data Manual
All
1/97
2.1
Changed DIFF_MODE to DIFF_MODE/
and modified SCSI Interface Timings
All
2/97
2.2
Title changed to SYM53C120 SCSI Bus
Expander. DC Characteristics, TolerANT
Technology Electrical Characteristics and
Differential Wiring Diagram changed.
Manual Title
4-1, 2, 3, 4, and 8
All of Chapter 5
6/97
3.0
This manual now includes the SYM2010x
boards
Timing changes in Chapter 4
Added Chapter 5, SYM2010x SCSI Boards
SYM53C120 Data Manual and SYM2010x Boards
iii
Contents
PRELIMINARY
Contents
Chapter 1
Introduction
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Scalable Device Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
SCSI Bus Electrical Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Chapter 2
Functional Description
Interface Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
SCSI A-Side and B-Side Single-Ended Control Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Re-timing Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Precision Delay Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
State Machine Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Differential Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Data and Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Busy (BSY) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Request (REQ)/Acknowledge (ACK) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Reset (RST) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Control/Data (C/D), Input/Output (I/O), Message (MSG) and Attention (ATN) Controls . . . . . . . . . . . . 2-4
Select (SEL) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Differential Direction Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Differential Mode (DIFF_MODE/) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Differential Sense (DIFF_SENSE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Clock (CLOCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Chip Reset (RESET/) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Warm Start Enable and Transfer Active (WS_ENABLE and XFER_ACTIVE) . . . . . . . . . . . . . . . . . . . . . . . 2-6
Chapter 3
Signal Descriptions
SYM53C120 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SYM53C120 Signal Grouping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
SCSI A Interface Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
SCSI B Single-ended Interface Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
SCSI B Differential Interface Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Control Interface Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
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