ISO/IEC INTERNATIONAL STANDARD 14776-115 First edition 2004-11 Information technology Small computer system interface (Scsl)- Part 115: Parallel Interface-5 (SPI-5) IEC ISO Reference number ISO/IEC 14776-115:2004(E) SHI Ag p Not for Resale adzi rneworking emitedwithoutliensfrmH Not for Resale ISO/IEC INTERNATIONAL STANDARD 14776-115 First edition 2004-11 Information technology Small computer system interface (scsl) - Part 115: Parallel Interface-5 (SPl-5) @IS0/IEC 2004 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-1211 Geneve 20 · Switzerland EC PRICE CODE XG ISO For price, see current catalogue Copyright International Organization for Standardization Not for Resale adzi rneworking emitedwithoutliensfrmH Not for Resale 14776-115 @ ISO/IEC:2004(E) 3 Contents Page Foreword .19 Introduction... ..20 1 Scope .21 2 Normative references .... 2.1 Normative references 22 2.2Approvedreferences 22 2.3 References under development 23 2.4 Other references ...... 3 Definitions, symbols, abbreviations, and conventions . .23 3.1 Definitions .. 3.2 Symbols and abbreviations ... 32 .. Ke.ywords ............. 3.4 Conventions ..34 3.5 Notation for Procedures and Functions .... 4 scsl parallel interface model ..36 4.1 Scsl parallel interface model overview .36 4.2 Cables, connectors, signals, transceivers .36 4.4 Driver-receiver connections .37 4.5 Physical topology details and definitions 4.6 Bus segment loading ... ..39 4.7 Termination requirements .39 4.8 SCSI device Addressing 4.9 Clocking methods for data transfers .40 4.10 Paced transfer on a SCSI bus 4.11 Data transfers .. .44 4.11.1 Data transfer modes .44 4.11.1.1 Asynchronous transfers 4.11.1.2 Synchronous transfers 44 4.11.1.3 Paced transfers ... 4.11.2 ST DATA phase parallel transfers .44 4.11.3 DT DATA phase parallel transfers 4.11.3.1 DT DATA phase parallel transfers format 4.11.3.2 Data group transfers .45 4.11.3.3 Information unit transfers 4.12 Negotiation .. .46 4.12.1 Negotiation introduction 4.12.2 Negotiation algorithm .46 4.12.3 When to negotiate ..... 4.12.4 Negotiable fields .. ..48 4.12.4.1 Negotiable fields introduction .48 4.12.4.2 Transfer agreements .... 4.12.4.3 Transfer period factor .49 4.12.4.4 REQ/ACK offset 4.12.4.5 Transfer width exponent .52 4.12.4.6Protocoloptions .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.... CopyrightInternational Organization for Standardization n or networking permitted without licer nse from IHS Not for Resale 14776-115 @ ISO/IEC:2004(E) 3 Contents Page Foreword .19 Introduction... ..20 1 Scope .21 2 Normative references .... 2.1 Normative references 22 2.2Approvedreferences 22 2.3 References under development 23 2.4 Other references ...... 3 Definitions, symbols, abbreviations, and conventions . .23 3.1 Definitions .. 3.2 Symbols and abbreviations ... 32 .. Ke.ywords ............. 3.4 Conventions ..34 3.5 Notation for Procedures and Functions .... 4 scsl parallel interface model ..36 4.1 Scsl parallel interface model overview .36 4.2 Cables, connectors, signals, transceivers .36 4.4 Driver-receiver connections .37 4.5 Physical topology details and definitions 4.6 Bus segment loading ... ..39 4.7 Termination requirements .39 4.8 SCSI device Addressing 4.9 Clocking methods for data transfers .40 4.10 Paced transfer on a SCSI bus 4.11 Data transfers .. .44 4.11.1 Data transfer modes .44 4.11.1.1 Asynchronous transfers 4.11.1.2 Synchronous transfers 44 4.11.1.3 Paced transfers ... 4.11.2 ST DATA phase parallel transfers .44 4.11.3 DT DATA phase parallel transfers 4.11.3.1 DT DATA phase parallel transfers format 4.11.3.2 Data group transfers .45 4.11.3.3 Information unit transfers 4.12 Negotiation .. .46 4.12.1 Negotiation introduction 4.12.2 Negotiation algorithm .46 4.12.3 When to negotiate ..... 4.12.4 Negotiable fields .. ..48 4.12.4.1 Negotiable fields introd