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Title Page and Frt Matter New Format DAT Scsi Manual . DDS-4 and DAT 72 Tape Drives and Autoloaders . SCSI Interface Manual . Copyright © 2003 Certance LLC. All rights reserved Part Number 50000697 June 2003, Rev.B Certance and the Certance logo are trademarks of Certance LLC. Seagate is a trademark of Seagate Technology LLC. Other product names are trademarks or registered trademarks of their respective owners. Certance reserves the right to change, without notice, product offerings or specifications. No part of this publication may be reproduced in any form without written permission from Certance LLC. Important Information About This Manual All information contained in or disclosed by this document is considered proprietary by Certance. By accepting this material, the recipient agrees that this material and the information contained therein are held in confidence and in trust and will not be used, reproduced in whole or in part, nor its contents revealed to others, except to meet the purpose for which it was delivered. It is understood that no right is conveyed to reproduce or translate any item herein disclosed without express written permission from Certance. Certance provides this manual "as is," without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Certance reserves the right to change, without notification, the specifications contained in this manual. Certance assumes no responsibility for the accuracy, completeness, sufficiency, or usefulness of this manual, nor for any problem that might arise from the use of the information in this manual. Contents Page iii Contents Introduction 1 Overview...................................................................................................................... 1 Drive Models ............................................................................................................... 1 About This Manual ...................................................................................................... 1 SCSI Interface Description 2 Overview...................................................................................................................... 2 ANSI SCSI Bus Standards ................................................................................... 2 Cabling and Connectors ....................................................................................... 2 Signal Descriptions...................................................................................................... 3 Command Set Description .......................................................................................... 4 ANSI X3.131, 199x Conformance Statement (SCSI-2) .............................................. 5 General features ................................................................................................... 5 Interface standards conformance ......................................................................... 5 Commands............................................................................................................ 6 * Autoloader only commands................................................................................ 6 Messages.............................................................................................................. 6 Vendor-unique commands.................................................................................... 6 SCSI Bus Protocol....................................................................................................... 6 Waiting and Control Phases........................................................................................ 7 Arbitrating Systems............................................................................................... 7 Selection and Reselection Phases.............................................................................. 9 Select With Attention ..........................................................................................10 Identify Message.................................................................................................10 Information Transfer Phases.....................................................................................11 Asynchronous Data Transfer..............................................................................11 Synchronous Data Transfer................................................................................13 Command Phase.......................................................................................................14 Data Phase................................................................................................................15 Data-In Phase.....................................................................................................15 Data-Out Phase ..................................................................................................15 Status Phase .............................................................................................................15 Message Phase.........................................................................................................15 Message-In Phase..............................................................................................15 Page iv DDS-4 SCSI Interface Manual, Rev. B Message-Out Phase ...........................................................................................15 Command Descriptor Block.......................................................................................16 Logical Unit Support ..................................................................................................17 SCSI Message Descriptions and Definitions.............................................................18 SCSI Status Code Descriptions and Definitions .......................................................23 Attention Condition ....................................................................................................24 Reset Condition .........................................................................................................24 Unit Attention Condition.............................................................................................24 Buffered Mode ...........................................................................................................25 Immediate Function ...................................................................................................25 Residual Length Function..........................................................................................25 Disconnect/Reconnect Function................................................................................26 SCSI Memory Address Pointers................................................................................27 Current Data Pointers .........................................................................................27 Saved Data Pointers ...........................................................................................27 Early Warning Function .............................................................................................27 Error Reporting ..........................................................................................................28 Soft Errors ...........................................................................................................28 Hard Errors..........................................................................................................28 Variable and Fixed Mode Recording.........................................................................28 Autoloader Operation ................................................................................................29 General SCSI Information...................................................................................29 SCSI Medium Changer Commands ...................................................................29 General Operation ..............................................................................................31 Loading and Initialization ....................................................................................31 Front Panel Operation.........................................................................................32 Cassette Selection ..............................................................................................32 Automatic Loading Mode ....................................................................................32 Magazine Ejection...............................................................................................33 Stray Tape Recovery ..........................................................................................33 Commands 34 Introduction................................................................................................................34 Command Reference List ...................................................................................34 Conventions ........................................................................................................35 Command Descriptor Blocks (CDBs)........................................................................35 Command Descriptor Block Formats..................................................................35 Command Descriptor Block Field Descriptions ..................................................36 Flag and Link Bit Descriptions ............................................................................36
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