BS IEC 796-2-1991 Microprocessor system bus - 8-bit and 16-bit data MULTIBUS I Mechanical and pin descriptions for the system bus configuration with edge connectors (direct)《微处理器系统.pdf
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1、BRITISH STANDARD BSIEC 796-2:1990 Implementation of IEC796-2:1990 Microprocessor systembus 8-bit and16-bit data (MULTIBUS I) Part 2: Mechanical and pin descriptions for the system bus configuration, with edge connectors (direct)BSIEC796-2:1990 This British Standard, having been prepared under thedir
2、ectionof the InformationSystems TechnologyStandards Policy Committee, was published underthe authority of the Standards Board and comes into effect on 28 February1991 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference IST/6 Draft for comment 90/67535 DC
3、 ISBN 0 580 19345 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Committee IST/6, upon which the following bodies were represented: Association for Payment
4、 Clearing Services British Computer Society British Telecommunications plc Business Equipment and Information Technology Association Department of Trade and Industry (Information Technology Standards Unit) Department of Trade and Industry (National Physical Laboratory) Electronic Engineering Associa
5、tion Electricity Supply Industry in England and Wales HM Treasury (Central Computer and Telecommunications Agency) Information Technology Users Standards Association Institute of Data Processing Management Inter-Universities Computing Committee Joint Network Team National Computing Centre Ltd. Natio
6、nal Health Service OFTEL (Office of Telecommunications) Post Office Telecommunications Engineering and Manufacturing Association Telecommunications Managers Association Amendments issued since publication Amd. No. Date CommentsBSIEC796-2:1990 BSI 04-2000 i Contents Page Committees responsible Inside
7、 front cover National foreword ii Foreword iii Text of IEC 796-2 1BSIEC796-2:1990 ii BSI 04-2000 National foreword This British Standard reproduces verbatim IEC796-2:1990 and implements it as the UK national standard. This British Standard is published under the direction of the Information Systems
8、Technology Standards Policy Committee whose Technical Committee IST/6 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related internat
9、ional and European developments and promulgate them in the UK. For the purposes of this British Standard, any references to page numbers in the text should be ignored. NOTEInternational and European Standards, as well as overseas standards, are available from BSI Sales Department, BSI, Linford Wood,
10、 Milton Keynes, MK146LE. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages
11、 This document comprises a front cover, an inside front cover, pages i and ii, theIEC title page, pages ii to iv, pages1 to6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside fro
12、nt cover.BSIEC796-2:1990 ii BSI 04-2000 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Object 1 3 Backplane considerations 1 3.1 Board to board relationships 1 3.2 System bus pin assignments 1 3.3 Bus connectors 1 4 Form factors 1 4.1 Connector naming and pin numbering standards 2 4.2 Standar
13、d outline of printed wiring boards 2 Figure 1 Backplane card to card separation 2 Figure 2 Typical backplane 3 Figure 3 Connector and pin numbering 3 Figure 4 Standard printed wiring board outline 4 Table I Pin assignment of bus signals on connector (P1) 5 Table II Pin assignment of bus signals on c
14、onnector (P2) 6BSIEC796-2:1990 BSI 04-2000 iii Foreword 1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the National Committees having a special interest therein are represented, express, as nearly as possible, an international con
15、sensus of opinion on the subjects dealt with. 2) They have the form of recommendations for international use and they are accepted by the National Committees in that sense. 3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the text
16、 of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between the IEC recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter. 4) The IEC has not laid down any procedure concerning m
17、arking as an indication of approval and has no responsibility when an item of equipment is declared to comply with one of its recommendations. Preface This standard has been prepared by Sub-Committee47B 1) : Microprocessor systems, of IEC Technical Committee No.47: Semiconductor devices. This standa
18、rd forms Part2 of a series of publications, the other parts being: The text of this standard is based on the following documents: Full information on the voting for the approval of this standard can be found in the Voting Report indicated in the above table. 1) IEC Sub-Committee47B has now been tran
19、sferred to ISO/IEC JTC1. This standard was approved according to IEC procedures and is therefore published as an IEC standard. Publication796-1:1990: Microprocessor system bus8-bit and16-bit data (MULTIBUSI) Part1: Functional description with electrical and timing specifications. Publication796-3:19
20、90: Part3: Mechanical and pin descriptions for the Eurocard configuration with pin and socket (indirect) connectors. Six Months Rule Report on Voting 47B(CO)9 47B(CO)14iv blankBSIEC796-2:1990 BSI 04-2000 1 Introduction This standard is one of a series which deals with the electrical and mechanical i
21、nterfaces to allow various microprocessor system components to interact with each other. The interface bus serves as a parallel transfer and utility signal interconnect for closely coupled system components. The series consists of one functional description and two alternative mechanical standards.
22、1 Scope This standard is applicable to an interface used to connect microprocessor system components by means of the edge connector (direct) type backplane. 2 Object The object of this standard is to describe all the physical and mechanical specifications that a designer shall be concerned with when
23、 designing a backplane or when designing printed circuit boards that will plug into the system bus interface. All dimensions are in millimeters with inches added in parentheses for reference only. (Millimeter dimensions govern.) 3 Backplane considerations The maximum length of the backplane connecti
24、ng modules is457.2mm(18in). Extender boards used within the system will not be supported by the bus unless the overall resulting length of the bus including the extender card is less than the457.2mm maximum. 3.1 Board to board relationships The following printed circuit board specification shall be
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