Table Of Content

Working Draft T10 American National Project 1525D Standard Revision 6 16-Jan.-2003 Information technology - SCSI Parallel Interface-5 (SPI-5) This is a draft proposed American National Standard of Accredited Standards Committee INCITS. As such this is not a completed standard. The T10 Technical Committee may modify this document as a result of comments received during public review and its approval as a standard. Use of the information contained here in is at your own risk. Permission is granted to members of INCITS, its technical committees, and their associated task groups to reproduce this document for the purposes of INCITS standardization activities without further permission, provided this notice is included. All other rights are reserved. Any commercial or for-profit duplication is strictly prohibited. T10 Technical Editor: George O. Penokie IBM/Tivoli MS 2C6 3605 Highway 52 N. Rochester, MN 55901 USA Telephone: 1-507-253-5208 Facsimile: 1-507-253-2880 Email: [email protected] Reference number ISO/IEC ****** : 200x ANSI NCITS. - 200x Printed Thursday, January 16, 2003 5:13 pm T10/1525D revision 6 POINTS OF CONTACT: T10 Chair T10 Vice-Chair John B. Lohmeyer George O. Penokie LSI IBM/Tivoli 4420 ArrowsWest Drive 3605 Highway 52 N. MS 2C6 Colo Spgs, CO 80907-3444 Rochester, MN 55901 Tel: 1-719-533-7560 Tel: 1-507-253-5208 Fax: 1-719-593-7183 Fax: 1-507-253-2880 Email: [email protected] Email: [email protected] INCITS Secretariat INCITS Secretariat Telephone: 1-202-737-8888 1250 Eye Street, NW Suite 200 Facsimile: 1-202-638-4922 Washington, DC 20005 Email: [email protected] T10 Web Site http://www.t10.org/ T10 Reflector Internet address for subscription to the T10 reflector: [email protected] The message body should be: subscribe t10 Internet address for distribution via T10 reflector: [email protected] Internet address to unsubscribe from the T10 reflector: [email protected] The message body should be: unsubscribe t10 Document Distribution INCITS Online Store http://www.techstreet.com/incits.html managed by Techstreet Telephone: 1-734-302-7801 1327 Jones Drive or 1-800-699-9277 Ann Arbor, MI 48105 Facsimile: 1-734-302-7811 or Global Engineering http://global.ihs.com/ 15 Inverness Way East Telephone: 1-303-792-2181 Englewood, CO 80112-5704 or 1-800-854-7179 Facsimile: 1-303-792-2192 ii Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 American National Standard for Information Technology SCSI Parallel Interface-5 (SPI-5) Secretariat Information Technology Industry Council Approved mm.dd.yy American National Standards Institute, Inc. ABSTRACT This standard defines mechanical, electrical, timing requirements, command, and task management delivery protocol requirements to transfer commands and data between SCSI devices attached to a SCSI parallel interface. This standard is intended to be used in conjunction with the SCSI command sets. The resulting interface facilitates the interconnection of computers and intelligent peripherals and thus provides a common interface standard for both system integrators and suppliers of intelligent peripherals. Working Draft SCSI Parallel Interface-5 iii ANSI NCITS. - 200x Approval of an American National Standard requires verification by ANSI that the American requirements for due process, consensus, and other criteria for approval have been National met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by Standard directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give interpretation on any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. CAUTION: The developers of this standard have requested that holders of patents that may be required for the implementation of the standard, disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard, following calls for the identification of patents that may be required for the implementation of the standard, no such claims have been made. No further patent search is conducted by the developer or the publisher in respect to any standard it processes. No representation is made or implied that licenses are not required to avoid infringement in the use of this standard. Published by American National Standards Institute 11 W. 42nd Street, New York, New York 10036 Copyright © 2002 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Suite 200, Washington, DC 20005. Printed in the United States of America iv Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 Contents Page Foreword (This foreword is not part of this standard) ...............................................................................xxi Introduction ..............................................................................................................................................xxiii 1 Scope .......................................................................................................................................................1 2 Normative references ...............................................................................................................................3 2.1 Normative references ......................................................................................................................3 2.2 Approved references .......................................................................................................................3 2.3 References under development ......................................................................................................4 2.4 Other references .............................................................................................................................4 3 Definitions, symbols, abbreviations, and conventions ..............................................................................4 3.1 Definitions .......................................................................................................................................4 3.2 Symbols and abbreviations ...........................................................................................................11 3.3 Keywords ......................................................................................................................................11 3.4 Conventions ..................................................................................................................................12 3.5 Notation for Procedures and Functions .........................................................................................13 4 General ...................................................................................................................................................14 4.1 General overview ..........................................................................................................................14 4.2 Cables, connectors, signals, transceivers .....................................................................................14 4.3 Physical architecture of bus segment ...........................................................................................14 4.4 Driver-receiver connections ..........................................................................................................15 4.5 Physical topology details and definitions .......................................................................................15 4.6 Bus segment loading .....................................................................................................................17 4.7 Termination requirements .............................................................................................................18 4.8 SCSI device Addressing ...............................................................................................................18 4.9 Clocking methods for data transfers .............................................................................................18 4.10 Paced transfer on a SCSI bus .....................................................................................................21 4.11 Data transfers ..............................................................................................................................23 4.11.1 Data transfer modes .................................................................................................................23 4.11.1.1 Asynchronous transfers ........................................................................................................23 4.11.1.2 Synchronous transfers ..........................................................................................................23 4.11.1.3 Paced transfers .....................................................................................................................23 4.11.2 ST DATA phase parallel transfers ............................................................................................23 4.11.3 DT DATA phase parallel transfers ...........................................................................................24 4.11.3.1 DT DATA phase parallel transfers format .............................................................................24 4.11.3.2 Data group transfers .............................................................................................................24 4.11.3.3 Information unit transfers ......................................................................................................24 4.12 Negotiation ..................................................................................................................................25 4.12.1 Negotiation introduction ...........................................................................................................25 4.12.2 Negotiation algorithm ...............................................................................................................25 4.12.3 When to negotiate ....................................................................................................................26 4.12.4 Negotiable fields .......................................................................................................................27 4.12.4.1 Negotiable fields introduction ................................................................................................27 4.12.4.2 Transfer agreements .............................................................................................................28 4.12.4.3 Transfer period factor ............................................................................................................29 4.12.4.4 REQ/ACK offset ....................................................................................................................31 4.12.4.5 Transfer width exponent ........................................................................................................32 4.12.4.6 Protocol options ....................................................................................................................32 4.12.4.6.1 Protocol options introduction ..............................................................................................32 4.12.4.6.2 IU_REQ ..............................................................................................................................33 4.12.4.6.3 DT_REQ .............................................................................................................................34 4.12.4.6.4 QAS_REQ ..........................................................................................................................34 4.12.4.6.5 HOLD_MCS .......................................................................................................................34 Working Draft SCSI Parallel Interface-5 v T10/1525D revision 6 4.12.4.6.6 WR_FLOW .........................................................................................................................35 4.12.4.6.7 RD_STRM ..........................................................................................................................35 4.12.4.6.8 RTI .....................................................................................................................................35 4.12.4.6.9 PCOMP_EN .......................................................................................................................35 4.12.5 Negotiable field combinations ..................................................................................................36 4.12.6 Message restrictions ................................................................................................................38 4.12.7 Negotiation message sequences .............................................................................................38 4.12.7.1 Negotiation message sequences overview ...........................................................................38 4.12.7.2 SCSI initiator port originated PPR negotiation ......................................................................39 4.12.7.3 SCSI initiator port originated WDTR negotiation ...................................................................41 4.12.7.4 SCSI initiator port originated SDTR negotiation ....................................................................43 4.12.7.5 SCSI target port originated WDTR negotiation .....................................................................45 4.12.7.6 SCSI target port originated SDTR negotiation ......................................................................47 4.13 Protocol .......................................................................................................................................49 5 SCSI parallel interface connectors .........................................................................................................52 5.1 SCSI parallel interface connectors overview .................................................................................52 5.2 Nonshielded connector .................................................................................................................52 5.2.1 Nonshielded connector alternative 1 - A cable ...........................................................................52 5.2.2 Nonshielded connector alternative 2 - A cable ...........................................................................52 5.2.3 Nonshielded connector alternative 3 - P cable ...........................................................................53 5.2.4 Nonshielded connector alternative 4 ..........................................................................................53 5.3 Shielded connector .......................................................................................................................59 5.3.1 Shielded connector overview .....................................................................................................59 5.3.2 Shielded connector alternative 1 - A cable .................................................................................59 5.3.3 Shielded connector alternative 2 - A cable .................................................................................59 5.3.4 Shielded connector alternative 3 - P cable .................................................................................59 5.3.5 Shielded connector alternative 4 - P cable .................................................................................59 5.4 Connector contact assignments ....................................................................................................67 5.4.1 Connector contact assignments overview ..................................................................................67 5.4.2 Differential connector contact assignments ...............................................................................68 6 SCSI bus segment interconnect .............................................................................................................71 6.1 SCSI bus segment interconnect overview ....................................................................................71 6.2 SCSI bus segment cables .............................................................................................................71 6.3 Interconnect characteristics for signals .........................................................................................72 6.3.1 SCSI bulk cable ..........................................................................................................................72 6.3.2 Minimum conductor size for signals ...........................................................................................73 6.3.3 Local transmission line impedance ............................................................................................73 6.3.4 Extended distance transmission line impedance .......................................................................73 6.3.5 Capacitance ...............................................................................................................................73 6.3.6 Differential propagation time and propagation time skew ..........................................................73 6.3.7 Differential attenuation ...............................................................................................................73 6.3.8 Crosstalk ....................................................................................................................................74 6.4 Decoupling characteristics for TERMPWR lines ...........................................................................74 6.5 Connection requirements for RESERVED lines ............................................................................75 6.6 Cables used with LVD transceivers ..............................................................................................75 6.7 LVD stub length and spacing ........................................................................................................76 7 SCSI parallel interface electrical characteristics .....................................................................................77 7.1 SCSI parallel interface electrical characteristics overview ............................................................77 7.2 LVD termination .............................................................................................................................77 7.2.1 LVD termination overview ..........................................................................................................77 7.2.2 LVD driver characteristics ..........................................................................................................82 7.2.3 LVD receiver characteristics ......................................................................................................85 7.2.4 LVD capacitive loads ..................................................................................................................86 7.2.4.1 Management of LVD release glitches .....................................................................................88 vi Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 7.2.5 SE/HVD transmission mode detection .......................................................................................90 7.2.5.1 SE/HVD transmission mode detection overview .....................................................................90 7.2.5.2 LVD DIFFSENS driver ............................................................................................................90 7.2.5.3 LVD DIFFSENS receiver .........................................................................................................91 7.3 Terminator power ..........................................................................................................................93 8 SCSI bus signals ....................................................................................................................................95 8.1 SCSI bus signals overview ............................................................................................................95 8.2 Signal descriptions ........................................................................................................................95 8.3 LVD Signal states ..........................................................................................................................98 8.4 OR-tied signals ..............................................................................................................................99 8.5 Signal sources ...............................................................................................................................99 9 SCSI parallel bus timing .......................................................................................................................101 9.1 SCSI parallel bus timing values ..................................................................................................101 9.2 Timing description .......................................................................................................................107 9.2.1 Arbitration delay .......................................................................................................................107 9.2.2 ATN transmit setup time ...........................................................................................................108 9.2.3 ATN receive setup time ............................................................................................................108 9.2.4 Bus clear delay .........................................................................................................................108 9.2.5 Bus free delay ..........................................................................................................................108 9.2.6 Bus set delay ............................................................................................................................108 9.2.7 Bus settle delay ........................................................................................................................109 9.2.8 Cable skew ...............................................................................................................................109 9.2.9 Chip noise in receiver ...............................................................................................................109 9.2.10 Clock jitter ..............................................................................................................................109 9.2.11 Crosstalk time shift .................................................................................................................109 9.2.12 Flow control receive hold time ................................................................................................109 9.2.13 Flow control receive setup time ..............................................................................................109 9.2.14 Flow control transmit hold time ..............................................................................................109 9.2.15 Flow control transmit setup time ............................................................................................109 9.2.16 Offset induced time asymmetry ..............................................................................................110 9.2.17 pCRC receive hold time .........................................................................................................110 9.2.18 pCRC receive setup time .......................................................................................................110 9.2.19 pCRC transmit hold time ........................................................................................................110 9.2.20 pCRC transmit setup time ......................................................................................................110 9.2.21 Data release delay .................................................................................................................110 9.2.22 DIFFSENS voltage filter time .................................................................................................110 9.2.23 Physical disconnection delay .................................................................................................110 9.2.24 Power on to selection .............................................................................................................110 9.2.25 QAS arbitration delay .............................................................................................................111 9.2.26 QAS assertion delay ..............................................................................................................111 9.2.27 QAS release delay .................................................................................................................111 9.2.28 QAS non-DATA phase REQ(ACK) period .............................................................................111 9.2.29 Receive assertion period ........................................................................................................111 9.2.30 Receive hold time ...................................................................................................................111 9.2.31 Receive internal hold time ......................................................................................................111 9.2.32 Receive internal setup time ....................................................................................................111 9.2.33 Receive negation period ........................................................................................................112 9.2.34 Receive setup time .................................................................................................................112 9.2.35 Receive REQ(ACK) period tolerance .....................................................................................112 9.2.36 Receive REQ assertion period with P_CRCA transitioning ...................................................112 9.2.37 Receive REQ negation period with P_CRCA transitioning ....................................................112 9.2.38 Receive Skew Compensation ................................................................................................112 9.2.39 Receiver amplitude time skew ...............................................................................................112 9.2.40 Receiver de-skewed data valid window .................................................................................112 9.2.41 REQ(ACK) period ...................................................................................................................113 Working Draft SCSI Parallel Interface-5 vii T10/1525D revision 6 9.2.42 Reset delay ............................................................................................................................113 9.2.43 Reset hold time ......................................................................................................................113 9.2.44 Reset to selection ...................................................................................................................113 9.2.45 Residual skew error ...............................................................................................................114 9.2.46 Selection abort time ...............................................................................................................114 9.2.47 Selection time-out delay .........................................................................................................114 9.2.48 Signal timing skew .................................................................................................................114 9.2.49 Skew correction range ...........................................................................................................114 9.2.50 Strobe offset tolerance ...........................................................................................................115 9.2.51 System deskew delay ............................................................................................................115 9.2.52 System noise at launch ..........................................................................................................115 9.2.53 System noise at receiver ........................................................................................................115 9.2.54 Time asymmetry .....................................................................................................................115 9.2.55 Transmit assertion period .......................................................................................................115 9.2.56 Transmit hold time ..................................................................................................................116 9.2.57 Transmit ISI Compensation ....................................................................................................116 9.2.58 Transmit negation period .......................................................................................................116 9.2.59 Transmit setup time ................................................................................................................116 9.2.60 Transmit REQ(ACK) period tolerance ....................................................................................116 9.2.61 Transmit REQ assertion period with P_CRCA transitioning ..................................................116 9.2.62 Transmit REQ negation period with P_CRCA transitioning ...................................................116 9.2.63 Transmitter skew ....................................................................................................................116 9.2.64 Transmitter time asymmetry ...................................................................................................117 9.3 Measurement points ....................................................................................................................117 9.3.1 Measurement points overview .................................................................................................117 9.3.2 LVD measurement points .........................................................................................................118 9.4 Receiver Masks ...........................................................................................................................120 9.4.1 Synchronous transfers and for fast-160 paced transfer clocking signals .................................120 9.4.2 Paced transfers with precompensation enabled on fast-160 ...................................................121 9.4.3 Paced transfers with precompensation disabled on fast-160 and fast-320 ..............................123 9.5 Timing parameters ......................................................................................................................129 9.6 Setup and hold timings ................................................................................................................129 9.6.1 ST data transfer calculations ....................................................................................................129 9.6.2 DT data transfer calculations ...................................................................................................130 10 SCSI bus phases ................................................................................................................................132 10.1 SCSI bus phases overview .......................................................................................................132 10.2 BUS FREE phase .....................................................................................................................132 10.3 Expected and unexpected bus free phases ..............................................................................132 10.4 Arbitration ..................................................................................................................................133 10.4.1 Arbitration and QAS overview ................................................................................................133 10.4.2 NORMAL ARBITRATION phase ............................................................................................133 10.4.3 QAS protocol ..........................................................................................................................134 10.4.4 QAS phase .............................................................................................................................135 10.5 SELECTION phase ...................................................................................................................136 10.5.1 Selection Overview ................................................................................................................136 10.5.2 Selection using attention condition .........................................................................................137 10.5.2.1 Starting the SELECTION phase when using attention condition ........................................137 10.5.2.2 Information unit transfers disabled ......................................................................................137 10.5.2.3 Information unit transfers enabled .......................................................................................137 10.5.2.4 Selection using attention condition time-out procedure ......................................................137 10.5.3 Selection without using attention condition ............................................................................138 10.5.3.1 Information unit transfers disabled or enabled ....................................................................138 10.5.3.2 Selection without using attention condition time-out procedure ..........................................138 10.6 RESELECTION phase ..............................................................................................................139 10.6.1 RESELECTION phase overview ............................................................................................139 10.6.2 Physical reconnection ............................................................................................................139 viii Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 10.6.3 Physical reconnection time-out procedure .............................................................................140 10.7 Information transfer phases ......................................................................................................140 10.7.1 Information transfer phases overview ....................................................................................140 10.7.2 Asynchronous transfer ...........................................................................................................141 10.7.3 Synchronous transfer .............................................................................................................142 10.7.3.1 Synchronous transfer overview ...........................................................................................142 10.7.3.2 ST synchronous transfer .....................................................................................................142 10.7.3.3 DT synchronous transfer .....................................................................................................143 10.7.3.3.1 DT synchronous transfer overview ...................................................................................143 10.7.3.3.2 Information unit transfer ...................................................................................................143 10.7.3.3.3 DT DATA IN phase information unit transfer exception condition handling .....................144 10.7.3.3.4 DT DATA OUT phase information unit transfer exception condition handling ..................145 10.7.3.3.5 Data group data field transfer ...........................................................................................146 10.7.3.3.6 Data Group Pad field and pCRC field transfer to SCSI initiator port ................................146 10.7.3.3.7 Data Group Pad field and pCRC field transfer to SCSI target port ..................................148 10.7.4 Paced transfer ........................................................................................................................149 10.7.4.1 Paced transfer overview ......................................................................................................149 10.7.4.2 Paced transfer training pattern ............................................................................................150 10.7.4.2.1 Training pattern overview .................................................................................................150 10.7.4.2.2 DT DATA IN phase training pattern .................................................................................151 10.7.4.2.3 DT DATA OUT phase training pattern .............................................................................152 10.7.4.3 P1 data valid/invalid state transitions ..................................................................................153 10.7.4.3.1 P1 data valid/invalid state transitions overview ................................................................153 10.7.4.3.2 Starting pacing transfers at end of training pattern ..........................................................154 10.7.4.3.3 Starting pacing transfers with no training pattern .............................................................154 10.7.4.3.4 Ending pacing transfers ...................................................................................................155 10.7.4.4 Paced information unit transfer ...........................................................................................155 10.7.4.5 Deskewing ...........................................................................................................................156 10.7.5 Wide transfer ..........................................................................................................................156 10.8 COMMAND phase ....................................................................................................................157 10.8.1 COMMAND phase description ...............................................................................................157 10.8.2 COMMAND phase exception condition handling ...................................................................157 10.9 DATA phase ..............................................................................................................................158 10.9.1 DATA phase overview ............................................................................................................158 10.9.2 DT DATA IN phase .................................................................................................................158 10.9.3 DT DATA OUT phase .............................................................................................................158 10.9.4 ST DATA IN phase .................................................................................................................158 10.9.5 ST DATA OUT phase .............................................................................................................158 10.10 STATUS phase .......................................................................................................................158 10.10.1 STATUS phase description ..................................................................................................158 10.10.2 STATUS phase exception condition handling ......................................................................159 10.11 MESSAGE phase ....................................................................................................................159 10.11.1 MESSAGE phase overview .................................................................................................159 10.11.2 MESSAGE IN phase ............................................................................................................159 10.11.3 MESSAGE IN phase exception condition handling ..............................................................159 10.11.4 MESSAGE OUT phase ........................................................................................................159 10.11.5 MESSAGE OUT phase exception condition handling ..........................................................160 10.12 Signal restrictions between phases .........................................................................................160 11 DATA BUS protection .........................................................................................................................162 11.1 DATA BUS protection overview ................................................................................................162 11.2 ST DATA BUS protection using parity ......................................................................................162 11.3 DT DATA BUS protection using CRC .......................................................................................162 11.3.1 DT DATA BUS protection using CRC overview .....................................................................162 11.3.2 Error detection capabilities .....................................................................................................162 11.3.3 Order of bytes in the CRC field ..............................................................................................163 11.3.4 CRC generation and checking ...............................................................................................165 Working Draft SCSI Parallel Interface-5 ix T10/1525D revision 6 11.3.5 Test cases ..............................................................................................................................165 12 SCSI bus conditions ...........................................................................................................................166 12.1 SCSI bus conditions overview ...................................................................................................166 12.2 Attention condition .....................................................................................................................166 12.3 Bus reset condition ....................................................................................................................167 12.4 Hard reset .................................................................................................................................167 12.5 Reset events .............................................................................................................................168 12.5.1 Reset events overview ...........................................................................................................168 12.5.2 Bus reset event ......................................................................................................................168 12.5.3 Power on reset event .............................................................................................................168 12.5.4 Target reset event ..................................................................................................................168 13 SCSI bus phase sequences ...............................................................................................................169 13.1 SCSI bus phase sequences overview .......................................................................................169 13.2 Phase sequences with information units disabled ....................................................................170 13.2.1 Phase sequences for physical reconnection or selection using attention condition ...............170 13.2.2 Phase sequences for selection without using attention condition ..........................................171 13.3 Phase sequences with information unit enabled .......................................................................172 13.3.1 Phase sequences for physical reconnection or selection without using attention condition ..172 13.3.2 Phase sequences for selection using attention condition ......................................................173 14 SPI information units ..........................................................................................................................174 14.1 SPI information unit overview ....................................................................................................174 14.2 Information unit transfer logical operations ...............................................................................174 14.3 SPI information units .................................................................................................................180 14.3.1 SPI command information unit ...............................................................................................180 14.3.2 SPI L_Q information unit ........................................................................................................184 14.3.3 SPI data information unit ........................................................................................................187 14.3.4 SPI data stream information unit ............................................................................................188 14.3.5 SPI status information unit .....................................................................................................189 15 SCSI pointers .....................................................................................................................................193 16 SCSI messages ..................................................................................................................................194 16.1 SCSI messages overview .........................................................................................................194 16.2 Message protocols and formats ................................................................................................194 16.2.1 Message protocol rules ..........................................................................................................194 16.2.2 Message formats ....................................................................................................................194 16.2.3 One-byte messages ...............................................................................................................195 16.2.4 Two-byte messages ...............................................................................................................195 16.2.5 Extended messages ...............................................................................................................195 16.3 Link control messages ..............................................................................................................197 16.3.1 Link control message codes ...................................................................................................197 16.3.2 DISCONNECT .......................................................................................................................198 16.3.3 IDENTIFY ...............................................................................................................................198 16.3.4 IGNORE WIDE RESIDUE ......................................................................................................199 16.3.5 INITIATOR DETECTED ERROR ...........................................................................................200 16.3.6 LINKED COMMAND COMPLETE .........................................................................................200 16.3.7 MESSAGE PARITY ERROR .................................................................................................200 16.3.8 MESSAGE REJECT ..............................................................................................................200 16.3.9 MODIFY DATA POINTER ......................................................................................................201 16.3.10 MODIFY BIDIRECTIONAL DATA POINTER .......................................................................202 16.3.11 NO OPERATION ..................................................................................................................203 16.3.12 PARALLEL PROTOCOL REQUEST ...................................................................................203 16.3.13 QAS REQUEST ...................................................................................................................203 16.3.14 RESTORE POINTERS ........................................................................................................204 x Working Draft SCSI Parallel Interface-5

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Working Draft T10 American National Project 1525D Standard Revision 6 16-Jan.-2003 Information technology - SCSI Parallel Interface-5 (SPI-5) This is a draft proposed American National Standard of Accredited Standards Committee INCITS. As such this is not a completed standard. The T10 Technical Committee may modify this document as a result of comments received during public review and its approval as a standard. Use of the information contained here in is at your own risk. Permission is granted to members of INCITS, its technical committees, and their associated task groups to reproduce this document for the purposes of INCITS standardization activities without further permission, provided this notice is included. All other rights are reserved. Any commercial or for-profit duplication is strictly prohibited. T10 Technical Editor: George O. Penokie IBM/Tivoli MS 2C6 3605 Highway 52 N. Rochester, MN 55901 USA Telephone: 1-507-253-5208 Facsimile: 1-507-253-2880 Email: [email protected] Reference number ISO/IEC ****** : 200x ANSI NCITS. - 200x Printed Thursday, January 16, 2003 5:13 pm T10/1525D revision 6 POINTS OF CONTACT: T10 Chair T10 Vice-Chair John B. Lohmeyer George O. Penokie LSI IBM/Tivoli 4420 ArrowsWest Drive 3605 Highway 52 N. MS 2C6 Colo Spgs, CO 80907-3444 Rochester, MN 55901 Tel: 1-719-533-7560 Tel: 1-507-253-5208 Fax: 1-719-593-7183 Fax: 1-507-253-2880 Email: [email protected] Email: [email protected] INCITS Secretariat INCITS Secretariat Telephone: 1-202-737-8888 1250 Eye Street, NW Suite 200 Facsimile: 1-202-638-4922 Washington, DC 20005 Email: [email protected] T10 Web Site http://www.t10.org/ T10 Reflector Internet address for subscription to the T10 reflector: [email protected] The message body should be: subscribe t10 Internet address for distribution via T10 reflector: [email protected] Internet address to unsubscribe from the T10 reflector: [email protected] The message body should be: unsubscribe t10 Document Distribution INCITS Online Store http://www.techstreet.com/incits.html managed by Techstreet Telephone: 1-734-302-7801 1327 Jones Drive or 1-800-699-9277 Ann Arbor, MI 48105 Facsimile: 1-734-302-7811 or Global Engineering http://global.ihs.com/ 15 Inverness Way East Telephone: 1-303-792-2181 Englewood, CO 80112-5704 or 1-800-854-7179 Facsimile: 1-303-792-2192 ii Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 American National Standard for Information Technology SCSI Parallel Interface-5 (SPI-5) Secretariat Information Technology Industry Council Approved mm.dd.yy American National Standards Institute, Inc. ABSTRACT This standard defines mechanical, electrical, timing requirements, command, and task management delivery protocol requirements to transfer commands and data between SCSI devices attached to a SCSI parallel interface. This standard is intended to be used in conjunction with the SCSI command sets. The resulting interface facilitates the interconnection of computers and intelligent peripherals and thus provides a common interface standard for both system integrators and suppliers of intelligent peripherals. Working Draft SCSI Parallel Interface-5 iii ANSI NCITS. - 200x Approval of an American National Standard requires verification by ANSI that the American requirements for due process, consensus, and other criteria for approval have been National met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by Standard directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give interpretation on any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. CAUTION: The developers of this standard have requested that holders of patents that may be required for the implementation of the standard, disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard, following calls for the identification of patents that may be required for the implementation of the standard, no such claims have been made. No further patent search is conducted by the developer or the publisher in respect to any standard it processes. No representation is made or implied that licenses are not required to avoid infringement in the use of this standard. Published by American National Standards Institute 11 W. 42nd Street, New York, New York 10036 Copyright © 2002 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Suite 200, Washington, DC 20005. Printed in the United States of America iv Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 Contents Page Foreword (This foreword is not part of this standard) ...............................................................................xxi Introduction ..............................................................................................................................................xxiii 1 Scope .......................................................................................................................................................1 2 Normative references ...............................................................................................................................3 2.1 Normative references ......................................................................................................................3 2.2 Approved references .......................................................................................................................3 2.3 References under development ......................................................................................................4 2.4 Other references .............................................................................................................................4 3 Definitions, symbols, abbreviations, and conventions ..............................................................................4 3.1 Definitions .......................................................................................................................................4 3.2 Symbols and abbreviations ...........................................................................................................11 3.3 Keywords ......................................................................................................................................11 3.4 Conventions ..................................................................................................................................12 3.5 Notation for Procedures and Functions .........................................................................................13 4 General ...................................................................................................................................................14 4.1 General overview ..........................................................................................................................14 4.2 Cables, connectors, signals, transceivers .....................................................................................14 4.3 Physical architecture of bus segment ...........................................................................................14 4.4 Driver-receiver connections ..........................................................................................................15 4.5 Physical topology details and definitions .......................................................................................15 4.6 Bus segment loading .....................................................................................................................17 4.7 Termination requirements .............................................................................................................18 4.8 SCSI device Addressing ...............................................................................................................18 4.9 Clocking methods for data transfers .............................................................................................18 4.10 Paced transfer on a SCSI bus .....................................................................................................21 4.11 Data transfers ..............................................................................................................................23 4.11.1 Data transfer modes .................................................................................................................23 4.11.1.1 Asynchronous transfers ........................................................................................................23 4.11.1.2 Synchronous transfers ..........................................................................................................23 4.11.1.3 Paced transfers .....................................................................................................................23 4.11.2 ST DATA phase parallel transfers ............................................................................................23 4.11.3 DT DATA phase parallel transfers ...........................................................................................24 4.11.3.1 DT DATA phase parallel transfers format .............................................................................24 4.11.3.2 Data group transfers .............................................................................................................24 4.11.3.3 Information unit transfers ......................................................................................................24 4.12 Negotiation ..................................................................................................................................25 4.12.1 Negotiation introduction ...........................................................................................................25 4.12.2 Negotiation algorithm ...............................................................................................................25 4.12.3 When to negotiate ....................................................................................................................26 4.12.4 Negotiable fields .......................................................................................................................27 4.12.4.1 Negotiable fields introduction ................................................................................................27 4.12.4.2 Transfer agreements .............................................................................................................28 4.12.4.3 Transfer period factor ............................................................................................................29 4.12.4.4 REQ/ACK offset ....................................................................................................................31 4.12.4.5 Transfer width exponent ........................................................................................................32 4.12.4.6 Protocol options ....................................................................................................................32 4.12.4.6.1 Protocol options introduction ..............................................................................................32 4.12.4.6.2 IU_REQ ..............................................................................................................................33 4.12.4.6.3 DT_REQ .............................................................................................................................34 4.12.4.6.4 QAS_REQ ..........................................................................................................................34 4.12.4.6.5 HOLD_MCS .......................................................................................................................34 Working Draft SCSI Parallel Interface-5 v T10/1525D revision 6 4.12.4.6.6 WR_FLOW .........................................................................................................................35 4.12.4.6.7 RD_STRM ..........................................................................................................................35 4.12.4.6.8 RTI .....................................................................................................................................35 4.12.4.6.9 PCOMP_EN .......................................................................................................................35 4.12.5 Negotiable field combinations ..................................................................................................36 4.12.6 Message restrictions ................................................................................................................38 4.12.7 Negotiation message sequences .............................................................................................38 4.12.7.1 Negotiation message sequences overview ...........................................................................38 4.12.7.2 SCSI initiator port originated PPR negotiation ......................................................................39 4.12.7.3 SCSI initiator port originated WDTR negotiation ...................................................................41 4.12.7.4 SCSI initiator port originated SDTR negotiation ....................................................................43 4.12.7.5 SCSI target port originated WDTR negotiation .....................................................................45 4.12.7.6 SCSI target port originated SDTR negotiation ......................................................................47 4.13 Protocol .......................................................................................................................................49 5 SCSI parallel interface connectors .........................................................................................................52 5.1 SCSI parallel interface connectors overview .................................................................................52 5.2 Nonshielded connector .................................................................................................................52 5.2.1 Nonshielded connector alternative 1 - A cable ...........................................................................52 5.2.2 Nonshielded connector alternative 2 - A cable ...........................................................................52 5.2.3 Nonshielded connector alternative 3 - P cable ...........................................................................53 5.2.4 Nonshielded connector alternative 4 ..........................................................................................53 5.3 Shielded connector .......................................................................................................................59 5.3.1 Shielded connector overview .....................................................................................................59 5.3.2 Shielded connector alternative 1 - A cable .................................................................................59 5.3.3 Shielded connector alternative 2 - A cable .................................................................................59 5.3.4 Shielded connector alternative 3 - P cable .................................................................................59 5.3.5 Shielded connector alternative 4 - P cable .................................................................................59 5.4 Connector contact assignments ....................................................................................................67 5.4.1 Connector contact assignments overview ..................................................................................67 5.4.2 Differential connector contact assignments ...............................................................................68 6 SCSI bus segment interconnect .............................................................................................................71 6.1 SCSI bus segment interconnect overview ....................................................................................71 6.2 SCSI bus segment cables .............................................................................................................71 6.3 Interconnect characteristics for signals .........................................................................................72 6.3.1 SCSI bulk cable ..........................................................................................................................72 6.3.2 Minimum conductor size for signals ...........................................................................................73 6.3.3 Local transmission line impedance ............................................................................................73 6.3.4 Extended distance transmission line impedance .......................................................................73 6.3.5 Capacitance ...............................................................................................................................73 6.3.6 Differential propagation time and propagation time skew ..........................................................73 6.3.7 Differential attenuation ...............................................................................................................73 6.3.8 Crosstalk ....................................................................................................................................74 6.4 Decoupling characteristics for TERMPWR lines ...........................................................................74 6.5 Connection requirements for RESERVED lines ............................................................................75 6.6 Cables used with LVD transceivers ..............................................................................................75 6.7 LVD stub length and spacing ........................................................................................................76 7 SCSI parallel interface electrical characteristics .....................................................................................77 7.1 SCSI parallel interface electrical characteristics overview ............................................................77 7.2 LVD termination .............................................................................................................................77 7.2.1 LVD termination overview ..........................................................................................................77 7.2.2 LVD driver characteristics ..........................................................................................................82 7.2.3 LVD receiver characteristics ......................................................................................................85 7.2.4 LVD capacitive loads ..................................................................................................................86 7.2.4.1 Management of LVD release glitches .....................................................................................88 vi Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 7.2.5 SE/HVD transmission mode detection .......................................................................................90 7.2.5.1 SE/HVD transmission mode detection overview .....................................................................90 7.2.5.2 LVD DIFFSENS driver ............................................................................................................90 7.2.5.3 LVD DIFFSENS receiver .........................................................................................................91 7.3 Terminator power ..........................................................................................................................93 8 SCSI bus signals ....................................................................................................................................95 8.1 SCSI bus signals overview ............................................................................................................95 8.2 Signal descriptions ........................................................................................................................95 8.3 LVD Signal states ..........................................................................................................................98 8.4 OR-tied signals ..............................................................................................................................99 8.5 Signal sources ...............................................................................................................................99 9 SCSI parallel bus timing .......................................................................................................................101 9.1 SCSI parallel bus timing values ..................................................................................................101 9.2 Timing description .......................................................................................................................107 9.2.1 Arbitration delay .......................................................................................................................107 9.2.2 ATN transmit setup time ...........................................................................................................108 9.2.3 ATN receive setup time ............................................................................................................108 9.2.4 Bus clear delay .........................................................................................................................108 9.2.5 Bus free delay ..........................................................................................................................108 9.2.6 Bus set delay ............................................................................................................................108 9.2.7 Bus settle delay ........................................................................................................................109 9.2.8 Cable skew ...............................................................................................................................109 9.2.9 Chip noise in receiver ...............................................................................................................109 9.2.10 Clock jitter ..............................................................................................................................109 9.2.11 Crosstalk time shift .................................................................................................................109 9.2.12 Flow control receive hold time ................................................................................................109 9.2.13 Flow control receive setup time ..............................................................................................109 9.2.14 Flow control transmit hold time ..............................................................................................109 9.2.15 Flow control transmit setup time ............................................................................................109 9.2.16 Offset induced time asymmetry ..............................................................................................110 9.2.17 pCRC receive hold time .........................................................................................................110 9.2.18 pCRC receive setup time .......................................................................................................110 9.2.19 pCRC transmit hold time ........................................................................................................110 9.2.20 pCRC transmit setup time ......................................................................................................110 9.2.21 Data release delay .................................................................................................................110 9.2.22 DIFFSENS voltage filter time .................................................................................................110 9.2.23 Physical disconnection delay .................................................................................................110 9.2.24 Power on to selection .............................................................................................................110 9.2.25 QAS arbitration delay .............................................................................................................111 9.2.26 QAS assertion delay ..............................................................................................................111 9.2.27 QAS release delay .................................................................................................................111 9.2.28 QAS non-DATA phase REQ(ACK) period .............................................................................111 9.2.29 Receive assertion period ........................................................................................................111 9.2.30 Receive hold time ...................................................................................................................111 9.2.31 Receive internal hold time ......................................................................................................111 9.2.32 Receive internal setup time ....................................................................................................111 9.2.33 Receive negation period ........................................................................................................112 9.2.34 Receive setup time .................................................................................................................112 9.2.35 Receive REQ(ACK) period tolerance .....................................................................................112 9.2.36 Receive REQ assertion period with P_CRCA transitioning ...................................................112 9.2.37 Receive REQ negation period with P_CRCA transitioning ....................................................112 9.2.38 Receive Skew Compensation ................................................................................................112 9.2.39 Receiver amplitude time skew ...............................................................................................112 9.2.40 Receiver de-skewed data valid window .................................................................................112 9.2.41 REQ(ACK) period ...................................................................................................................113 Working Draft SCSI Parallel Interface-5 vii T10/1525D revision 6 9.2.42 Reset delay ............................................................................................................................113 9.2.43 Reset hold time ......................................................................................................................113 9.2.44 Reset to selection ...................................................................................................................113 9.2.45 Residual skew error ...............................................................................................................114 9.2.46 Selection abort time ...............................................................................................................114 9.2.47 Selection time-out delay .........................................................................................................114 9.2.48 Signal timing skew .................................................................................................................114 9.2.49 Skew correction range ...........................................................................................................114 9.2.50 Strobe offset tolerance ...........................................................................................................115 9.2.51 System deskew delay ............................................................................................................115 9.2.52 System noise at launch ..........................................................................................................115 9.2.53 System noise at receiver ........................................................................................................115 9.2.54 Time asymmetry .....................................................................................................................115 9.2.55 Transmit assertion period .......................................................................................................115 9.2.56 Transmit hold time ..................................................................................................................116 9.2.57 Transmit ISI Compensation ....................................................................................................116 9.2.58 Transmit negation period .......................................................................................................116 9.2.59 Transmit setup time ................................................................................................................116 9.2.60 Transmit REQ(ACK) period tolerance ....................................................................................116 9.2.61 Transmit REQ assertion period with P_CRCA transitioning ..................................................116 9.2.62 Transmit REQ negation period with P_CRCA transitioning ...................................................116 9.2.63 Transmitter skew ....................................................................................................................116 9.2.64 Transmitter time asymmetry ...................................................................................................117 9.3 Measurement points ....................................................................................................................117 9.3.1 Measurement points overview .................................................................................................117 9.3.2 LVD measurement points .........................................................................................................118 9.4 Receiver Masks ...........................................................................................................................120 9.4.1 Synchronous transfers and for fast-160 paced transfer clocking signals .................................120 9.4.2 Paced transfers with precompensation enabled on fast-160 ...................................................121 9.4.3 Paced transfers with precompensation disabled on fast-160 and fast-320 ..............................123 9.5 Timing parameters ......................................................................................................................129 9.6 Setup and hold timings ................................................................................................................129 9.6.1 ST data transfer calculations ....................................................................................................129 9.6.2 DT data transfer calculations ...................................................................................................130 10 SCSI bus phases ................................................................................................................................132 10.1 SCSI bus phases overview .......................................................................................................132 10.2 BUS FREE phase .....................................................................................................................132 10.3 Expected and unexpected bus free phases ..............................................................................132 10.4 Arbitration ..................................................................................................................................133 10.4.1 Arbitration and QAS overview ................................................................................................133 10.4.2 NORMAL ARBITRATION phase ............................................................................................133 10.4.3 QAS protocol ..........................................................................................................................134 10.4.4 QAS phase .............................................................................................................................135 10.5 SELECTION phase ...................................................................................................................136 10.5.1 Selection Overview ................................................................................................................136 10.5.2 Selection using attention condition .........................................................................................137 10.5.2.1 Starting the SELECTION phase when using attention condition ........................................137 10.5.2.2 Information unit transfers disabled ......................................................................................137 10.5.2.3 Information unit transfers enabled .......................................................................................137 10.5.2.4 Selection using attention condition time-out procedure ......................................................137 10.5.3 Selection without using attention condition ............................................................................138 10.5.3.1 Information unit transfers disabled or enabled ....................................................................138 10.5.3.2 Selection without using attention condition time-out procedure ..........................................138 10.6 RESELECTION phase ..............................................................................................................139 10.6.1 RESELECTION phase overview ............................................................................................139 10.6.2 Physical reconnection ............................................................................................................139 viii Working Draft SCSI Parallel Interface-5 T10/1525D revision 6 10.6.3 Physical reconnection time-out procedure .............................................................................140 10.7 Information transfer phases ......................................................................................................140 10.7.1 Information transfer phases overview ....................................................................................140 10.7.2 Asynchronous transfer ...........................................................................................................141 10.7.3 Synchronous transfer .............................................................................................................142 10.7.3.1 Synchronous transfer overview ...........................................................................................142 10.7.3.2 ST synchronous transfer .....................................................................................................142 10.7.3.3 DT synchronous transfer .....................................................................................................143 10.7.3.3.1 DT synchronous transfer overview ...................................................................................143 10.7.3.3.2 Information unit transfer ...................................................................................................143 10.7.3.3.3 DT DATA IN phase information unit transfer exception condition handling .....................144 10.7.3.3.4 DT DATA OUT phase information unit transfer exception condition handling ..................145 10.7.3.3.5 Data group data field transfer ...........................................................................................146 10.7.3.3.6 Data Group Pad field and pCRC field transfer to SCSI initiator port ................................146 10.7.3.3.7 Data Group Pad field and pCRC field transfer to SCSI target port ..................................148 10.7.4 Paced transfer ........................................................................................................................149 10.7.4.1 Paced transfer overview ......................................................................................................149 10.7.4.2 Paced transfer training pattern ............................................................................................150 10.7.4.2.1 Training pattern overview .................................................................................................150 10.7.4.2.2 DT DATA IN phase training pattern .................................................................................151 10.7.4.2.3 DT DATA OUT phase training pattern .............................................................................152 10.7.4.3 P1 data valid/invalid state transitions ..................................................................................153 10.7.4.3.1 P1 data valid/invalid state transitions overview ................................................................153 10.7.4.3.2 Starting pacing transfers at end of training pattern ..........................................................154 10.7.4.3.3 Starting pacing transfers with no training pattern .............................................................154 10.7.4.3.4 Ending pacing transfers ...................................................................................................155 10.7.4.4 Paced information unit transfer ...........................................................................................155 10.7.4.5 Deskewing ...........................................................................................................................156 10.7.5 Wide transfer ..........................................................................................................................156 10.8 COMMAND phase ....................................................................................................................157 10.8.1 COMMAND phase description ...............................................................................................157 10.8.2 COMMAND phase exception condition handling ...................................................................157 10.9 DATA phase ..............................................................................................................................158 10.9.1 DATA phase overview ............................................................................................................158 10.9.2 DT DATA IN phase .................................................................................................................158 10.9.3 DT DATA OUT phase .............................................................................................................158 10.9.4 ST DATA IN phase .................................................................................................................158 10.9.5 ST DATA OUT phase .............................................................................................................158 10.10 STATUS phase .......................................................................................................................158 10.10.1 STATUS phase description ..................................................................................................158 10.10.2 STATUS phase exception condition handling ......................................................................159 10.11 MESSAGE phase ....................................................................................................................159 10.11.1 MESSAGE phase overview .................................................................................................159 10.11.2 MESSAGE IN phase ............................................................................................................159 10.11.3 MESSAGE IN phase exception condition handling ..............................................................159 10.11.4 MESSAGE OUT phase ........................................................................................................159 10.11.5 MESSAGE OUT phase exception condition handling ..........................................................160 10.12 Signal restrictions between phases .........................................................................................160 11 DATA BUS protection .........................................................................................................................162 11.1 DATA BUS protection overview ................................................................................................162 11.2 ST DATA BUS protection using parity ......................................................................................162 11.3 DT DATA BUS protection using CRC .......................................................................................162 11.3.1 DT DATA BUS protection using CRC overview .....................................................................162 11.3.2 Error detection capabilities .....................................................................................................162 11.3.3 Order of bytes in the CRC field ..............................................................................................163 11.3.4 CRC generation and checking ...............................................................................................165 Working Draft SCSI Parallel Interface-5 ix T10/1525D revision 6 11.3.5 Test cases ..............................................................................................................................165 12 SCSI bus conditions ...........................................................................................................................166 12.1 SCSI bus conditions overview ...................................................................................................166 12.2 Attention condition .....................................................................................................................166 12.3 Bus reset condition ....................................................................................................................167 12.4 Hard reset .................................................................................................................................167 12.5 Reset events .............................................................................................................................168 12.5.1 Reset events overview ...........................................................................................................168 12.5.2 Bus reset event ......................................................................................................................168 12.5.3 Power on reset event .............................................................................................................168 12.5.4 Target reset event ..................................................................................................................168 13 SCSI bus phase sequences ...............................................................................................................169 13.1 SCSI bus phase sequences overview .......................................................................................169 13.2 Phase sequences with information units disabled ....................................................................170 13.2.1 Phase sequences for physical reconnection or selection using attention condition ...............170 13.2.2 Phase sequences for selection without using attention condition ..........................................171 13.3 Phase sequences with information unit enabled .......................................................................172 13.3.1 Phase sequences for physical reconnection or selection without using attention condition ..172 13.3.2 Phase sequences for selection using attention condition ......................................................173 14 SPI information units ..........................................................................................................................174 14.1 SPI information unit overview ....................................................................................................174 14.2 Information unit transfer logical operations ...............................................................................174 14.3 SPI information units .................................................................................................................180 14.3.1 SPI command information unit ...............................................................................................180 14.3.2 SPI L_Q information unit ........................................................................................................184 14.3.3 SPI data information unit ........................................................................................................187 14.3.4 SPI data stream information unit ............................................................................................188 14.3.5 SPI status information unit .....................................................................................................189 15 SCSI pointers .....................................................................................................................................193 16 SCSI messages ..................................................................................................................................194 16.1 SCSI messages overview .........................................................................................................194 16.2 Message protocols and formats ................................................................................................194 16.2.1 Message protocol rules ..........................................................................................................194 16.2.2 Message formats ....................................................................................................................194 16.2.3 One-byte messages ...............................................................................................................195 16.2.4 Two-byte messages ...............................................................................................................195 16.2.5 Extended messages ...............................................................................................................195 16.3 Link control messages ..............................................................................................................197 16.3.1 Link control message codes ...................................................................................................197 16.3.2 DISCONNECT .......................................................................................................................198 16.3.3 IDENTIFY ...............................................................................................................................198 16.3.4 IGNORE WIDE RESIDUE ......................................................................................................199 16.3.5 INITIATOR DETECTED ERROR ...........................................................................................200 16.3.6 LINKED COMMAND COMPLETE .........................................................................................200 16.3.7 MESSAGE PARITY ERROR .................................................................................................200 16.3.8 MESSAGE REJECT ..............................................................................................................200 16.3.9 MODIFY DATA POINTER ......................................................................................................201 16.3.10 MODIFY BIDIRECTIONAL DATA POINTER .......................................................................202 16.3.11 NO OPERATION ..................................................................................................................203 16.3.12 PARALLEL PROTOCOL REQUEST ...................................................................................203 16.3.13 QAS REQUEST ...................................................................................................................203 16.3.14 RESTORE POINTERS ........................................................................................................204 x Working Draft SCSI Parallel Interface-5

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