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     CHIPS AND TECHNOLOGIES, INC.
 3050 ZANKER ROAD, SAN JOSE, CA 95134
             408-434-0600



            PRELIMINARY


     82C5086
REFERENCE MANUAL




            NOVEMBER 1989
             CPI063/11-89
                 REVC

            STK# 10063-001
CHIPS 82C5086 SCSI-Bus Interface Controller
            Reference Manual


       Document Number: 3001711-0001
                 Revision C
The infonnation in this publication is subject to change without notice.

No part of this publication may be reproduced, stored in a retrieval system,
or transmitted, in any fonn or by any means, electronic, mechanical,
photocopying, recording, or otherwise. without the prior written pennission
of Chips and Technologies Inc.

Copyright 1989 Chips and Technologies, Inc.

All Rights Reserved

CHIPS is a trademark of Chips and Technologies, Inc.

The following products trademarked by other companies are referenced in
this manual:

IBM PC AT is an IBM trademark.
Z8 is a Zilog trademark.
80286 is an Intel trademark.




                              ii
Revision History



 Revision     Change Activity             Date      Applioved


    A              First Release         1/29/88    P.H./ P.D.

    B          Second Release            10/31/88   P.H . ./M.S.

    C              Third Release         10/10/89    BJM/JC




                                   iii
    PREFACE


    AUDIENCE
               This manual is intended for firmware design engineers who are interested
               in programming the CHIPS 82C5086 SCSI-Bus Interface Controller;
               however, such topics as pin descriptions that would be of interest to
               hardware design engineers are also addressed.

    SCOPE
               This manual contains the information a firmware design engineer needs to
               program this chip to implement the SCSI (Small Computer System
               Interface) interface on a host computer or a device controller. It is assumed
               the reader already has a working knowledge of the SCSI interface.

    CONTENTS
               The information in this manual is divided into five chapters, one appendix,
               and a glossary.

               o      Chapter 1 provides an overview of the CHIPS 82C5086 SCSI-Bus
                      Interface Controller.

               o      Chapter 2 which is intended for hardware design engineers
                      describes the 82C5086 hardware specifications. It supplies physical
                      and functional pin specifications, signal descriptions, electrical
                      specifications, and packaging specifications.

               o      Chapter 3 which is directed at firmware engineers describes the
                      operational modes of the 82C5086.

               o      Chapter 4 which is intended for firmware engineers provides a
                      detailed description of the function and operation of each of the 24
                      internal registers of the 82C5086.

               o      Chapter 5 provides a detailed description of the operation of each of
                      the 46 commands of the 82C5086. This chapter is intended for
                      firmware engineers.
               o      Appendix A contains a sample flow chart that illustrates the steps
                      involved in completing an asynchronous data transfer to a target

c                     device.




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