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1、 INTERNATIONAL STANDARD ISO/IEC 14776-115 First edition 2004-11 Information technology Small computer system interface (SCSI) Part 115: Parallel Interface-5 (SPI-5) Reference number ISO/IEC 14776-115:2004(E) Copyright International Organization for Standardization Provided by IHS under license with
2、ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, Us
3、er=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO/IEC 14776-115 First edition 2004-11 Information technology Small computer system interface (SCSI) Part 115: Parallel Interface-5 (SPI-5) PRICE CODE
4、 ISO/IEC 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office Case postal
5、e 56 CH-1211 Genve 20 Switzerland For price, see current catalogue XG Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted wi
6、thout license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 1477
7、6-1153 Contents Page Foreword .19 Introduction.20 1 Scope .21 2 Normative references .22 2.1 Normative references 22 2.2 Approved references .22 2.3 References under development 23 2.4 Other references .23 3 Definitions, symbols, abbreviations, and conventions 23 3.1 Definitions .23 3.2 Symbols and
8、abbreviations .32 3.3 Keywords 33 3.4 Conventions 34 3.5 Notation for Procedures and Functions .35 4 SCSI parallel interface model .36 4.1 SCSI parallel interface model overview 36 4.2 Cables, connectors, signals, transceivers .36 4.3 Physical architecture of bus segment .36 4.4 Driver-receiver conn
9、ections 37 4.5 Physical topology details and definitions .37 4.6 Bus segment loading .39 4.7 Termination requirements .39 4.8 SCSI device Addressing .39 4.9 Clocking methods for data transfers .40 4.10 Paced transfer on a SCSI bus .42 4.11 Data transfers 44 4.11.1 Data transfer modes .44 4.11.1.1 As
10、ynchronous transfers 44 4.11.1.2 Synchronous transfers 44 4.11.1.3 Paced transfers .44 4.11.2 ST DATA phase parallel transfers 44 4.11.3 DT DATA phase parallel transfers .45 4.11.3.1 DT DATA phase parallel transfers format .45 4.11.3.2 Data group transfers .45 4.11.3.3 Information unit transfers 45
11、4.12 Negotiation 46 4.12.1 Negotiation introduction .46 4.12.2 Negotiation algorithm .46 4.12.3 When to negotiate 47 4.12.4 Negotiable fields .48 4.12.4.1 Negotiable fields introduction 48 4.12.4.2 Transfer agreements .49 4.12.4.3 Transfer period factor 49 4.12.4.4 REQ/ACK offset 51 4.12.4.5 Transfe
12、r width exponent 52 4.12.4.6 Protocol options 52 4.12.4.6.1 Protocol options introduction 52 4.12.4.6.2 IU_REQ 53 4.12.4.6.3 DT_REQ .54 14776-115 ISO/IEC:2004(E)3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=W
13、ing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS -,-,- 4ISO/IEC 14776-115 4.12.4.6.4 QAS_REQ 54 4.12.4.6.5 HOLD_MCS .54 4.12.4.6.6 WR_FLOW .55 4.12.4.6.7 RD_STRM 55 4.12.4.6.8 RTI .55 4.12.4.6.9 PCOMP_EN .55 4.12.5 Negotiable field c
14、ombinations 56 4.12.6 Message restrictions 57 4.12.7 Negotiation message sequences .58 4.12.7.1 Negotiation message sequences overview .58 4.12.7.2 SCSI initiator port originated PPR negotiation 59 4.12.7.3 SCSI initiator port originated WDTR negotiation .60 4.12.7.4 SCSI initiator port originated S
15、DTR negotiation 62 4.12.7.5 SCSI target port originated WDTR negotiation .64 4.12.7.6 SCSI target port originated SDTR negotiation 67 4.13 Protocol .68 5 SCSI parallel interface connectors .71 5.1 SCSI parallel interface connectors overview .71 5.2 Non-shielded connector 71 5.2.1 Non-shielded connec
16、tor alternative 1 - A cable .71 5.2.2 Non-shielded connector alternative 2 - A cable .71 5.2.3 Non-shielded connector alternative 3 - P cable .72 5.2.4 Non-shielded connector alternative 4 .72 5.3 Shielded connector .78 5.3.1 Shielded connector overview .78 5.3.2 Shielded connector alternative 1 - A
17、 cable .78 5.3.3 Shielded connector alternative 2 - A cable .78 5.3.4 Shielded connector alternative 3 - P cable .78 5.3.5 Shielded connector alternative 4 - P cable .78 5.4 Connector contact assignments 86 5.4.1 Connector contact assignments overview 86 5.4.2 Differential connector contact assignme
18、nts .87 6 SCSI bus segment interconnect .90 6.1 SCSI bus segment interconnect overview 90 6.2 SCSI bus segment cables .90 6.3 Interconnect characteristics for signals .91 6.3.1 SCSI bulk cable 91 6.3.2 Minimum conductor size for signals .92 6.3.3 Local transmission line impedance 92 6.3.4 Extended d
19、istance transmission line impedance .92 6.3.5 Capacitance .92 6.3.6 Differential propagation time and propagation time skew 92 6.3.7 Differential attenuation .92 6.3.8 Crosstalk 93 6.4 Decoupling characteristics for TERMPWR lines .93 6.5 Connection requirements for RESERVED lines 94 6.6 Cables used
20、with LVD transceivers 94 6.7 LVD stub length and spacing 95 7 SCSI parallel interface electrical characteristics .96 7.1 SCSI parallel interface electrical characteristics overview 96 7.2 LVD termination .96 7.2.1 LVD termination overview 96 7.2.2 LVD driver characteristics 101 7.2.3 LVD receiver ch
21、aracteristics 104 414776-115 ISO/IEC:2004(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS -,
22、-,- ISO/IEC 14776-1155 7.2.4 LVD capacitive loads 105 7.2.4.1 Management of LVD release glitches .107 7.2.5 SE/HVD transmission mode detection .109 7.2.5.1 SE/HVD transmission mode detection overview .109 7.2.5.2 LVD DIFFSENS driver 109 7.2.5.3 LVD DIFFSENS receiver .110 7.3 Terminator power 112 8 S
23、CSI bus signals 114 8.1 SCSI bus signals overview 114 8.2 Signal descriptions 114 8.3 LVD Signal states 117 8.4 OR-tied signals 118 8.5 Signal sources .118 9 SCSI parallel bus timing .120 9.1 SCSI parallel bus timing values 120 9.2 Timing description .126 9.2.1 Arbitration delay .126 9.2.2 ATN trans
24、mit setup time .127 9.2.3 ATN receive setup time 127 9.2.4 Bus clear delay .127 9.2.5 Bus free delay 127 9.2.6 Bus set delay 127 9.2.7 Bus settle delay 128 9.2.8 Cable skew .128 9.2.9 Chip noise in receiver .128 9.2.10 Clock jitter 128 9.2.11 Crosstalk time shift .128 9.2.12 Flow control receive hol
25、d time 128 9.2.13 Flow control receive setup time 128 9.2.14 Flow control transmit hold time 128 9.2.15 Flow control transmit setup time 128 9.2.16 Offset induced time asymmetry 129 9.2.17 pCRC receive hold time .129 9.2.18 pCRC receive setup time .129 9.2.19 pCRC transmit hold time 129 9.2.20 pCRC
26、transmit setup time 129 9.2.21 Data release delay .129 9.2.22 DIFFSENS voltage filter time .129 9.2.23 Physical disconnection delay .129 9.2.24 Power on to selection .129 9.2.25 QAS arbitration delay .130 9.2.26 QAS assertion delay 130 9.2.27 QAS release delay .130 9.2.28 QAS non-DATA phase REQ(ACK)
27、 period .130 9.2.29 Receive assertion period 130 9.2.30 Receive hold time .130 9.2.31 Receive internal hold time 130 9.2.32 Receive internal setup time 130 9.2.33 Receive negation period 131 9.2.34 Receive setup time .131 9.2.35 Receive REQ(ACK) period tolerance .131 9.2.36 Receive REQ assertion per
28、iod with P_CRCA transitioning .131 9.2.37 Receive REQ negation period with P_CRCA transitioning 131 9.2.38 Receive Skew Compensation 131 9.2.39 Receiver amplitude time skew .131 14776-115 ISO/IEC:2004(E)5 Copyright International Organization for Standardization Provided by IHS under license with ISO
29、 Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS -,-,- 6ISO/IEC 14776-115 9.2.40 Receiver de-skewed data valid window .131 9.2.41 REQ(ACK) period .132 9.2.42 Reset delay 132 9.2.43 Reset hold
30、 time 132 9.2.44 Reset to selection .132 9.2.45 Residual skew error .133 9.2.46 Selection abort time .133 9.2.47 Selection time-out delay .133 9.2.48 Signal timing skew .133 9.2.49 Skew correction range .133 9.2.50 Strobe offset tolerance .134 9.2.51 System deskew delay 134 9.2.52 System noise at la
31、unch 134 9.2.53 System noise at receiver 134 9.2.54 Time asymmetry .134 9.2.55 Transmit assertion period .134 9.2.56 Transmit hold time 135 9.2.57 Transmit ISI Compensation 135 9.2.58 Transmit negation period .135 9.2.59 Transmit setup time 135 9.2.60 Transmit REQ(ACK) period tolerance 135 9.2.61 Tr
32、ansmit REQ assertion period with P_CRCA transitioning 135 9.2.62 Transmit REQ negation period with P_CRCA transitioning .135 9.2.63 Transmitter skew 135 9.2.64 Transmitter time asymmetry .136 9.3 Measurement points 136 9.3.1 Measurement points overview .136 9.3.2 LVD measurement points .137 9.4 Rece
33、iver Masks .139 9.4.1 Synchronous transfers and for fast-160 paced transfer clocking signals .139 9.4.2 Paced transfers with precompensation enabled on fast-160 .140 9.4.3 Paced transfers with precompensation disabled on fast-160 and fast-320 142 9.5 Timing parameters 148 9.6 Setup and hold timings
34、148 9.6.1 ST data transfer calculations 148 9.6.2 DT data transfer calculations .149 10 SCSI bus phases 151 10.1 SCSI bus phases overview .151 10.2 BUS FREE phase .151 10.3 Expected and unexpected bus free phases 151 10.4 Arbitration 152 10.4.1 Arbitration and QAS overview 152 10.4.2 NORMAL ARBITRAT
35、ION phase 152 10.4.3 QAS protocol 153 10.4.4 QAS phase .154 10.5 SELECTION phase .155 10.5.1 Selection Overview 155 10.5.2 Selection using attention condition .156 10.5.2.1 Starting the SELECTION phase when using attention condition 156 10.5.2.2 Information unit transfers disabled 156 10.5.2.3 Infor
36、mation unit transfers enabled .156 10.5.2.4 Selection using attention condition time-out procedure 156 10.5.3 Selection without using attention condition 157 10.5.3.1 Information unit transfers disabled or enabled 157 10.5.3.2 Selection without using attention condition time-out procedure 157 10.6 R
37、ESELECTION phase 158 614776-115 ISO/IEC:2004(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction or networking permitted without license from IHS
38、 -,-,- ISO/IEC 14776-1157 10.6.1 RESELECTION phase overview 158 10.6.2 Physical reconnection 158 10.6.3 Physical reconnection time-out procedure .159 10.7 Information transfer phases 159 10.7.1 Information transfer phases overview 159 10.7.2 Asynchronous transfer .160 10.7.3 Synchronous transfer .16
39、1 10.7.3.1 Synchronous transfer overview .161 10.7.3.2 ST synchronous transfer .161 10.7.3.3 DT synchronous transfer .162 10.7.3.3.1 DT synchronous transfer overview .162 10.7.3.3.2 Information unit transfer .162 10.7.3.3.3 DT DATA IN phase information unit transfer exception condition handling .163
40、 10.7.3.3.4 DT DATA OUT phase information unit transfer exception condition handling 164 10.7.3.3.5 Data group data field transfer .165 10.7.3.3.6 Data Group Pad field and pCRC field transfer to SCSI initiator port 165 10.7.3.3.7 Data Group Pad field and pCRC field transfer to SCSI target port 167 1
41、0.7.4 Paced transfer 168 10.7.4.1 Paced transfer overview 168 10.7.4.2 Paced transfer training pattern 169 10.7.4.2.1 Training pattern overview .169 10.7.4.2.2 DT DATA IN phase training pattern .170 10.7.4.2.3 DT DATA OUT phase training pattern .171 10.7.4.3 P1 data valid/invalid state transitions 1
42、72 10.7.4.3.1 P1 data valid/invalid state transitions overview 172 10.7.4.3.2 Starting pacing transfers at end of training pattern 173 10.7.4.3.3 Starting pacing transfers with no training pattern .173 10.7.4.3.4 Ending pacing transfers .174 10.7.4.4 Paced information unit transfer .174 10.7.4.5 Des
43、kewing .175 10.7.5 Wide transfer 175 10.8 COMMAND phase 176 10.8.1 COMMAND phase description .176 10.8.2 COMMAND phase exception condition handling .176 10.9 DATA phase 177 10.9.1 DATA phase overview 177 10.9.2 DT DATA IN phase .177 10.9.3 DT DATA OUT phase .177 10.9.4 ST DATA IN phase .177 10.9.5 S
44、T DATA OUT phase .177 10.10 STATUS phase .177 10.10.1 STATUS phase description 177 10.10.2 STATUS phase exception condition handling 178 10.11 MESSAGE phase 178 10.11.1 MESSAGE phase overview .178 10.11.2 MESSAGE IN phase 178 10.11.3 MESSAGE IN phase exception condition handling 178 10.11.4 MESSAGE
45、OUT phase 178 10.11.5 MESSAGE OUT phase exception condition handling 179 10.12 Signal restrictions between phases .179 11 DATA BUS protection .181 11.1 DATA BUS protection overview 181 11.2 ST DATA BUS protection using parity 181 11.3 DT DATA BUS protection using CRC .181 11.3.1 DT DATA BUS protecti
46、on using CRC overview .181 11.3.2 Error detection capabilities .181 14776-115 ISO/IEC:2004(E)7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/02/2007 21:41:15 MDTNo reproduction o
47、r networking permitted without license from IHS -,-,- 8ISO/IEC 14776-115 11.3.3 Order of bytes in the CRC field 182 11.3.4 CRC generation and checking .184 11.3.5 Test cases 184 12 SCSI bus conditions .185 12.1 SCSI bus conditions overview .185 12.2 Attention condition .185 12.3 Bus reset condition
48、186 12.4 Hard reset .186 12.5 Reset events .187 12.5.1 Reset events overview .187 12.5.2 Bus reset event 187 12.5.3 Power on reset event .187 12.5.4 Target reset event 187 13 SCSI bus phase sequences .188 13.1 SCSI bus phase sequences overview .188 13.2 Phase sequences with information units disabled 189 13.2.1 Phase sequences for physical reconnection or selection using attention condition .189 13.2.2 Phase sequences for selection without using attention condi