ISO/IEC INTERNATIONAL STANDARD 14776-112 First edition 2002-05 Information technology - Small computer system interface (scsl) - Part 112: Parallel Interface-2 (SPl-2) EC So Reference number ISO/IEC 14776-112:2002(E) Not for Resale adizai eworkingmitedwihoutlicenefrmH Not for Resale ISO/IEC INTERNATIONAL STANDARD 14776-112 First edition 2002-05 Information technology Small computer system interface (scsl) - Part 112: Parallel Interface-2 (SPl-2) @ISO/IEC 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any ISO/IEC Copyright Office:Case postale 56·CH-1211Geneve 20·Switzerland XE IEC PRICE CODE So Forprice, see currentcatalogue IHSunder Not for Resale 14776-112 @ ISO/IEC:2002(E) Contents Page Introduction xiv 1 Scope 2 Normative references 2.1Normativereferences 2.2 Approved references .. 2.3 References under development . .3 3 Definitions, symbols, abbreviations, and conventions 3 3.1Definitions 3.2 Symbols and abbreviations .. 3.3Keywords.. 3.4 Conventions .. 3.5 Notation for Procedures and Functions ...... 13 4 General ... 4.1Overview.. 14 4.1.1Datatransfermodes. .14 4.1.2 Cables, Connectors, Signals, Transceivers 14 4.1.3 Physical architecture of bus ... 4.1.4 Physical topology details and definitions .... 15 .5 Bus loading ........ 4.1.6 Termination requirements 4.1.7 Device Addressing 18 4.1.8 Protocol ... .18 5 Scsl parallel interface connectors 5.1 scsl parallel interface connectors overview .21 5.2 Nonshielded connector ... 21 5.2.1Nonshieldedconnectoralternative1-Acable .21 5.2.2 Nonshielded connector alternative 2 - A cable .. .21 5.2.3 Nonshielded connector alternative 3 - P cable and Q cable .21 5.2.4 Nonshielded connector alternative 4 22 5.3 Shielded connector . 5.3.1 Shielded connector alternative 1 - A cable .28 5.3.2Shieldedconnectoralternative2-Acable. 5.3.3 Shielded connector alternative 3 - P cable and Q cable ..28 5.3.4 Shielded connector alternative 4 - P cable and Q cable 28 5.4 Connector contact assignments . 5.4.1 SE assignments .38 5.4.2 Differential connector contact assignments ..42 6 ScsI bus interconnect ..49 6.1 scsI bus interconnect overview . .49 6.2 scsI bus cables ... .49 6.3Interconnectcharacteristicsforsignals 6.4 Decoupling characteristics for TERMPWR and TERMPWRQ lines . .52 6.5 Connection requirements for RESERVED lines ..... 6.6 Cables used with SE transceivers .. ..53 6.1 SE ground offset .... .54 6.7 Cables used with differential transceivers . 6.7.1 HVD stub length and spacing .... .54 6.7.2 LVD stub length and spacing 7 scsl parallel interface electrical characteristics .56 7.1 scsl parallel interface electrical characteristics overview ..56 7.2 SE alternative ..... .57 ScSI Parallel Interface-2 se from IHS Not for Resale 14776-112 @ ISO/IEC:2002(E) 7.2.1 SE termination ..... 57 7.2.2 SE output characteristics .57 7..3 SE input characteristics ..... .60 7.2.4 SE input and output characteristics 7.3 LVD alternative . 62 7.3.1 LVD termination 7.3.2 LVD driver characteristics .66 7.3.3 LVD receiver characteristics 7.3.4 LVD capacitive loads ... ..67 7.3.4.1 Management of LVD release glitches .69 7.3.5 SE/HVD transmission mode detection 7.3.5.1 LVD DIFFSENS driver ..... .70 7.3.5.2 LVD DIFFSENS receiver .... 7.4 LVD/MSE multimode alternative 7.4.1LVD/MSEmultimodetermination 7.4.2 LVD/MSE multimode transceiver characteristics 7.4.3 Power for LVD/MSE multimode transceivers 74 7.4.4 Ground drivers 7.5 HVD alternative . 75 7.5.1 HVD termination ... 7.5.2 HVD output characteristics 7.5.3 HVD input characteristics 7.5.4 SE driver protection . ..79 7.6 Terminator power . .80 8 ScsI bus signals ..82 8.1 ScsI bus signals overview 8.2 Signal descriptions ...83 8.3 Parity checking rules .84 8.4 Signal states ... 8.4.1 SE ..84 8.2 Differential ...... 8.5 OR-tied signals .86 8.6 Signal sources . .86 9 scsI parallel bus timing 9.1 scsI parallel bus timing values 9.2 Timing description . ..89 9.2.1 Arbitration delay 9.2