ISO/IEC 14776-112:2002

Information technology - Small Computer System Interface (SCSI) - Part 112: Parallel Interface-2 (SPI-2)

The SCSI parallel interface is a local I/O bus that may be operated over a wide range of transfer rates.The objectives of the SCSI parallel interface are: a) To provide host computers with device independence within a class of devices. Thus,different disk drives, tape drives, printers, optical media drives and other devices may be added to the host computers without requiring modifications to generic system hardware. b) To provide compatibility such that properly conforming SCSI-2 devices may interoperate with SCSI-3 devices given that the systems engineering is correctly done. This international standard defines the mechanical, electrical, timing and protocol requirements of the SCSI parallel interface to allow conforming devices to interoperate. The interface protocol includes provision for the connection of multiple initiators and multiple targets. This standard defines the physical attributes of an input/output bus for interconnecting computers and peripheral devices.

General Information

• Status: Published
• Publication Date: 06-May-2002
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: PPUB - Publication issued
• Start Date: 30-May-2001
• Completion Date: 07-May-2002

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD
14776-112
First edition
2002-05
Information technology –
Small computer system interface (SCSI) –
Part 112:
Parallel Interface-2 (SPI-2)
Reference number
INTERNATIONAL ISO/IEC
STANDARD 14776-112
First edition
2002-05
Information technology –
Small computer system interface (SCSI) –
Part 112:
Parallel Interface-2 (SPI-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
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
ISO/IEC Copyright Office Case postale 56 CH-1211 Genève 20 Switzerland
• • •
PRICE CODE
XC
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14776-112 © ISO/IEC:2002(E)
Contents
Page
Introduction . xiv
1 Scope .1
2 Normative references .2
2.1 Normative references .2
2.2 Approved references .2
2.3 References under development .3
3 Definitions, symbols, abbreviations, and conventions .3
3.1 Definitions .3
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 Overview .14
4.1.1 Data transfer modes .14
4.1.2 Cables, Connectors, Signals, Transceivers .14
4.1.3 Physical architecture of bus .14
4.1.4 Physical topology details and definitions .15
4.1.5 Bus loading .17
4.1.6 Termination requirements .18
4.1.7 Device Addressing .18
4.1.8 Protocol .18
5 SCSI parallel interface connectors .21
5.1 SCSI parallel interface connectors overview .21
5.2 Nonshielded connector .21
5.2.1 Nonshielded connector alternative 1 - A cable .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 .27
5.3.1 Shielded connector alternative 1 - A cable .28
5.3.2 Shielded connector alternative 2 - A cable .28
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 .37
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
6.3 Interconnect characteristics for signals .50
6.4 Decoupling characteristics for TERMPWR and TERMPWRQ lines .52
6.5 Connection requirements for RESERVED lines .53
6.6 Cables used with SE transceivers .53
6.6.1 SE ground offset .54
6.7 Cables used with differential transceivers .54
6.7.1 HVD stub length and spacing .54
6.7.2 LVD stub length and spacing .55
7 SCSI parallel interface electrical characteristics .56
7.1 SCSI parallel interface electrical characteristics overview .56
7.2 SE alternative .57
ii  SCSI Parallel Interface-2

14776-112 © ISO/IEC:2002(E)
7.2.1 SE termination .57
7.2.2 SE output characteristics .57
7.2.3 SE input characteristics .60
7.2.4 SE input and output characteristics .61
7.3 LVD alternative .62
7.3.1 LVD termination .62
7.3.2 LVD driver characteristics .66
7.3.3 LVD receiver characteristics .66
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 .69
7.3.5.1 LVD DIFFSENS driver .70
7.3.5.2 LVD DIFFSENS receiver .70
7.4 LVD/MSE multimode alternative .72
7.4.1 LVD/MSE multimode termination .72
7.4.2 LVD/MSE multimode transceiver characteristics .73
7.4.3 Power for LVD/MSE multimode transceivers .74
7.4.4 Ground drivers .74
7.5 HVD alternative .75
7.5.1 HVD termination .75
7.5.2 HVD output characteristics .76
7.5.3 HVD input characteristics .78
7.5.4 SE driver protection .79
7.6 Terminator power .80
8 SCSI bus signals .82
8.1 SCSI bus signals overview .82
8.2 Signal descriptions .83
8.3 Parity checking rules .84
8.4 Signal states .84
8.4.1 SE .84
8.4.2 Differential .85
8.5 OR-tied signals .86
8.6 Signal sources .86
9 SCSI parallel bus timing .88
9.1 SCSI parallel bus timing values .88
9.2 Timing description .89
9.2.1 Arbitration delay .89
9.2.2 Bus clear delay .90
9.2.3 Bus free delay .90
9.2.4 Bus set delay .90
9.2.5 Bus settle delay .90
9.2.6 Cable skew .90
9.2.7 Data release delay .90
9.2.8 Disconnection delay .90
9.2.9 Power on to selection .90
9.2.10 Receive assertion period .90
9.2.11 Receive hold time .91
9.2.12 Receive negation peri
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