1、ANSI INCITS 336-2000(formerly ANSI NCITS 336-2000)for Information Technology SCSI Parallel Interface-3 (SPI-3)ANSINCITS 336-2000American National Standardfor Information Technology SCSI Parallel Interface-3 (SPI-3)SecretariatInformation Technology Industry Council (ITI)Approved November 14, 2000 Ame
2、rican National Standards Institute, Inc.AbstractThis standard defines mechanical, electrical, timing requirements, command, and the task managementdelivery protocol requirements to transfer commands and data between SCSI devices attached to aSCSI parallel interface. This standard is intended to be u
3、sed in conjunction with the SCSI command sets.The resulting interface facilitates the interconnection of computers and intelligent peripherals and thusprovides a common interface standard for both system integrators and suppliers of intelligent peripherals.Approval of an American National Standard r
4、equires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgement of the ANSI Board ofStandards Review, substantial agreement has been reached by directly andmaterially affec
5、ted interests. Substantial agreement means much more thana simple majority, but not necessarily unanimity. Consensus requires that allviews and objections be considered, and that a concerted effort be madetowards their resolution.The use of American National Standards is completely voluntary; theire
6、xistence does not in any respect preclude anyone, whether he has approvedthe standards or not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures not conforming to the standards.The American National Standards Institute does not develop standards andwill in no circ
7、umstances give an interpretation of any American NationalStandard. Moreover, no person shall have the right or authority to issue aninterpretation of an American National Standard in the name of the AmericanNational Standards Institute. Requests for interpretations should beaddressed to the secretar
8、iat or sponsor whose name appears on the titlepage of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, orwithdraw this standa
9、rd. Purchasers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Standards Institute, Inc.11 West 42nd Street, New York, NY 10036Copyright 2000 by Infor
10、mation Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of AmericaCAUTION: The
11、developers of this standard have requested that holders of patents that may be re-quired for the implementation of the standard disclose such patents to the publisher. However, nei-ther the developers nor the publisher have undertaken a patent search in order to identify which, ifany, patents may ap
12、ply to this standard. As of the date of publication of this standard, followingcalls for the identification of patents that may be required for the implementation of the standard,notice of one or more such claims has been received. By publication of this standard, no positionis taken with respect to
13、 the validity of this claim or of any rights in connection therewith. The knownpatent holder(s) has (have), however, filed a statement of willingness to grant a license underthese rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to ob-tain such a license. Detail
14、s may be obtained from the publisher. No further patent search is con-ducted by the developer or publisher in respect to any standard it processes. No representation ismade or implied that this is the only license that may be required to avoid infringement in the use ofthis standard.iContentsPageFor
15、eword . xiiiIntroduction .xvi1 Scope. 12 Normative references. 32.1 Normative references. 32.2 Approved references 32.3 References under development. 42.4 Other references 43 Definitions, symbols, abbreviations, and conventions . 43.1 Definitions 43.2 Symbols and abbreviations 93.3 Keywords . 103.4
16、Conventions. 113.5 Notation for Procedures and Functions . 114 General 134.1 General overview. 134.2 Cables, Connectors, Signals, Transceivers. 134.3 Physical architecture of bus. 134.4 Physical topology details and definitions . 144.5 Bus loading 164.6 Termination requirements 174.7 SCSI device Add
17、ressing 174.8 Data transfers 174.9 Data transfer modes 194.9.1 Data transfer modes overview . 194.9.2 ST DATA phase parallel transfers . 194.9.3 DT DATA phase parallel transfers . 194.9.3.1 DT DATA phase parallel transfers format 194.9.3.2 Data group transfers 204.9.3.3 Information unit transfers .
18、204.10 Protocol 205 SCSI parallel interface connectors. 235.1 SCSI parallel interface connectors overview . 235.2 Nonshielded connector 235.2.1 Nonshielded connector alternative 1 - A cable 235.2.2 Nonshielded connector alternative 2 - A cable 235.2.3 Nonshielded connector alternative 3 - P cable 24
19、5.2.4 Nonshielded connector alternative 4 245.3 Shielded connector 305.3.1 Shielded connector overview. 305.3.2 Shielded connector alternative 1 - A cable 305.3.3 Shielded connector alternative 2 - A cable 305.3.4 Shielded connector alternative 3 - P cable 305.3.5 Shielded connector alternative 4 -
20、P cable 305.4 Connector contact assignments. 38iiPage5.4.1 Connector contact assignments overview . 385.4.2 SE assignments. 405.4.3 Differential connector contact assignments . 436 SCSI bus interconnect . 466.1 SCSI bus interconnect overview 466.2 SCSI bus cables 466.3 Interconnect characteristics f
21、or signals 476.3.1 Applicability of requirements for SCSI cable media. 476.3.2 Minimum conductor size for signals. 476.3.3 Local transmission line impedance 476.3.4 Extended distance transmission line impedance. 486.3.5 Capacitance. 486.3.6 SE propagation time and propagation time skew 486.3.7 Diffe
22、rential propagation time and propagation time skew 486.3.8 SE attenuation . 496.3.9 Differential attenuation. 496.3.10 Crosstalk 496.4 Decoupling characteristics for TERMPWR lines 506.5 Connection requirements for RESERVED lines 506.6 Cables used with SE transceivers . 506.7 SE ground offset 516.8 C
23、ables used with LVD transceivers . 516.9 LVD stub length and spacing. 527 SCSI parallel interface electrical characteristics 537.1 SCSI parallel interface electrical characteristics overview. 537.2 SE alternative 547.2.1 SE termination . 547.2.2 SE output characteristics . 557.2.3 SE input character
24、istics . 577.2.4 SE input and output characteristics . 597.3 LVD alternative 597.3.1 LVD termination . 597.3.2 LVD driver characteristics 647.3.3 LVD receiver characteristics 657.3.4 LVD capacitive loads . 667.3.4. 1 Management of LVD release glitches. 687.3.5 SE/HVD transmission mode detection. 707
25、.3.5.1 SE/HVD transmission mode detection overview . 707.3.5.2 LVD DIFFSENS driver . 707.3.5.3 LVD DIFFSENS receiver . 717.4 LVD/MSE multimode alternative 737.4.1 LVD/MSE multimode termination. 737.4.2 LVD/MSE multimode transceiver characteristics. 757.4.3 Transceiver ground drivers 767.5 Terminator
26、 power. 768 SCSI bus signals . 788.1 SCSI bus signals overview 788.2 Signal descriptions. 788.3 Signal states 80iiiPage8.3.1 SE signals 808.3.2 LVD signals 808.4 OR-tied signals. 818.5 Signal sources 819 SCSI parallel bus timing. 839.1 SCSI parallel bus timing values . 839.2 Timing description 869.2
27、.1 Arbitration delay . 869.2.2 ATN transmit setup time. 869.2.3 ATN receive setup time 869.2.4 Bus clear delay. 869.2.5 Bus free delay 869.2.6 Bus set delay 869.2.7 Bus settle delay 869.2.8 Cable skew. 879.2.9 pCRC receive hold time . 879.2.10 pCRC receive setup time . 879.2.11 pCRC transmit hold ti
28、me 879.2.12 pCRC transmit setup time 879.2.13 Data release delay . 879.2.14 DIFFSENS voltage filter time . 879.2.15 Physical disconnection delay . 879.2.16 Power on to selection. 879.2.17 QAS arbitration delay . 879.2.18 QAS assertion delay 889.2.19 QAS release delay . 889.2.20 QAS non-DATA phase RE
29、Q (ACK) period 889.2.21 Receive assertion period 889.2.22 Receive hold time. 889.2.23 Receive negation period 889.2.24 Receive setup time. 889.2.25 Receive REQ (ACK) period tolerance 889.2.26 Receive REQ assertion period with P_CRCA transitioning . 889.2.27 Receive REQ negation period with P_CRCA tr
30、ansitioning 899.2.28 REQ (ACK) period 899.2.29 Reset delay 899.2.30 Reset hold time 899.2.31 Reset to selection. 899.2.32 Selection abort time . 899.2.33 Selection time-out delay. 899.2.34 Signal timing skew . 899.2.35 System deskew delay 909.2.36 Transmit assertion period. 909.2.37 Transmit hold ti
31、me 909.2.38 Transmit negation period . 909.2.39 Transmit setup time 909.2.40 Transmit REQ (ACK) period tolerance. 909.2.41 Transmit REQ assertion period with P_CRCA transitioning 909.2.42 Transmit REQ negation period with P_CRCA transitioning . 909.3 Measurement points. 919.3.1 Measurement points ov
32、erview . 91ivPage9.3.2 SE fast-5 and fast-10 measurement points . 919.3.3 SE fast-20 measurement points 929.3.4 LVD measurement points 929.4 Setup and hold timings 959.4.1 ST data transfer calculations . 959.4.2 DT data transfer calculations . 9610 SCSI bus phases . 9810.1 SCSI bus phases overview 9
33、810.2 BUS FREE phase 9810.3 Unexpected bus free phases . 9810.4 Expected bus free phases . 9910.5 Arbitration 9910.5.1 Arbitration and QAS overview 9910.5.2 NORMAL ARBITRATION phase . 9910.5.3 QAS protocol . 10010.5.4 QAS phase 10110.6 SELECTION phase 10210.6.1 Selection Overview 10210.6.2 Selection
34、 using attention condition 10210.6.2.1 Information unit transfers disabled. 10210.6.2.2 Information unit transfers enabled . 10310.6.2.3 Selection using attention condition time-out procedure . 10310.6.3 Selection without using attention condition 10310.6.3.1 Information unit transfers disabled or e
35、nabled. 10310.6.3.2 Selection without using attention condition time-out procedure. 10410.7 RESELECTION phase. 10410.7.1 RESELECTION phase overview . 10410.7.2 Physical reconnection 10410.7.3 Physical reconnection time-out procedure. 10510.8 Information transfer phases . 10610.8.1 Information transf
36、er phases overview 10610.8.2 Asynchronous information transfer 10710.8.3 Synchronous data transfer. 10810.8.3.1 Synchronous data transfer overview . 10810.8.3.2 ST synchronous data transfer 10810.8.3.3 DT synchronous data transfer . 10810.8.3.3.1 DT synchronous data transfer overview 10810.8.3.3.2 I
37、nformation unit transfer. 10910.8.3.3.3 DT DATA IN phase information unit transfer exception condition handling 10910.8.3.3.4 DT DATA OUT phase information unit transfer exception condition handling 11010.8.3.3.5 Data Group data field transfer . 11110.8.3.3.6 Data Group Pad field and pCRC field tran
38、sfer to initiator 11110.8.3.3.7 Data Group Pad field and pCRC field transfer to target 11310.8.3.4 Wide data transfer . 11410.9 COMMAND phase . 11510.9.1 COMMAND phase description. 11510.9.2 COMMAND phase exception condition handling. 11510.10 DATA phase 11610.10.1 DATA phase overview . 116vPage10.1
39、0.2 DT DATA IN phase 11610.10.3 DT DATA OUT phase 11610.10.4 ST DATA IN phase. 11610.10.5 ST DATA OUT phase. 11610.11 STATUS phase 11610.11.1 STATUS phase description 11610.11.2 STATUS phase exception condition handling 11710.12 MESSAGE phase. 11710.12.1 MESSAGE phase overview . 11710.12.2 MESSAGE I
40、N phase 11710.12.3 MESSAGE IN phase exception condition handling 11710.12.4 MESSAGE OUT phase 11710.12.5 MESSAGE OUT phase exception condition handling 11810.13 Signal restrictions between phases 11811 DATA BUS protection 11911.1 DATA BUS protection overview . 11911.2 ST DATA BUS protection (parity)
41、. 11911.3 DT DATA BUS protection (CRC) . 11911.3.1 DT DATA BUS protection (CRC) overview 11911.3.2 Error detection capabilities. 11911.3.3 Order of bytes in the CRC field 11911.3.4 CRC generation and checking . 12111.3.5 Test cases 12112 SCSI bus conditions. 12212.1 SCSI bus conditions overview 1221
42、2.2 Attention condition 12212.3 Hard reset 12312.4 Reset events 12312.4.1 Reset events overview. 12312.4.2 Transceiver mode change reset event. 12313 SCSI bus phase sequences. 12513.1 SCSI bus phase sequences overview 12513.2 Phase sequences for physical reconnection and selection using attention co
43、ndition with informa-tion unit transfers disabled. 12513.3 Phase sequences for selection without using attention condition with information unit transfers disabled 12713.4 Phase sequences for selection without using attention condition/physical reconnection with infor-mation unit transfers enabled .
44、 12813.5 Phase sequences for physical selection using attention condition with information unit transfers enabled . 12914 SPI information unit sequences . 13014.1 SPI information unit overview. 13014.2 Information unit transfer logical operations 13014.3 SPI information units 13514.3.1 SPI command i
45、nformation unit. 13514.3.2 SPI L_Q information unit 13814.3.3 SPI data information unit 140viPage14.3.4 SPI data stream information unit . 14014.3.5 SPI status information unit. 14115 SCSI pointers. 14416 SCSI messages . 14516.1 SCSI messages overview 14516.2 Message protocols and formats. 14516.2.1
46、 Message protocol rules 14516.2.2 Message formats . 14516.2.3 One-byte messages. 14616.2.4 Two-byte messages. 14616.2.5 Extended messages 14616.3 Link control messages . 14816.3.1 Link control message codes 14816.3.2 DISCONNECT . 14816.3.3 IDENTIFY 14916.3.4 IGNORE WIDE RESIDUE . 15016.3.5 INITIATOR
47、 DETECTED ERROR. 15116.3.6 MESSAGE PARITY ERROR . 15116.3.7 MESSAGE REJECT 15116.3.8 MODIFY DATA POINTER . 15216.3.9 NO OPERATION . 15216.3.10 PARALLEL PROTOCOL REQUEST . 15216.3.10.1 PARALLEL PROTOCOL REQUEST message description . 15216.3.10.2 PARALLEL PROTOCOL REQUEST negotiation 15716.3.11 QAS RE
48、QUEST. 15816.3.12 RESTORE POINTERS 15816.3.13 SAVE DATA POINTER 15816.3.14 SYNCHRONOUS DATA TRANSFER REQUEST . 15816.3.14.1 SYNCHRONOUS DATA TRANSFER REQUEST message description 15816.3.14.2 Target initiated SDTR negotiation 16116.3.14.3 Initiator initiated SDTR negotiation 16216.3.15 TASK COMPLETE.
49、 16216.3.16 WIDE DATA TRANSFER REQUEST 16216.3.16.1 WIDE DATA TRANSFER REQUEST message description 16216.3.16.2 Target initiated WDTR negotiation. 16416.3.16.3 Initiator initiated WDTR negotiation . 16516.4 Task attribute messages 16516.4.1 Task attribute message overview and codes. 16516.4.2 ACA . 16616.4.3 HEAD OF QUEUE . 16716.4.4 LINKED COMMAND COMPLETE . 16716.4.5 ORDERED. 16716.4.6 SIMPLE 16716.5 Task management messages 16816.5.1 Task management message codes. 16816.5.2 ABORT TASK 16816.5.3 ABORT TASK SET 16916.5.4 CLEAR ACA 16916.5.5 CLEAR TASK SET 16916.5.6 LOGICAL UNIT RESET. 16
