1、IECISONORMEINTERNATIONALEINTERNATIONALSTANDARDCEIIEC60821Deuxime ditionSecond edition1991-12Bus CEI 821 VMEbus Bus systme microprocesseursPour donnes de 1 octet 4 octetsIEC 821 VMEbus Microprocessor system busfir 1 byte to 4 byte dataNumro de rfrenceReference numberISO/IEC 60821:1991LICENSED TO MECO
2、N Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IECNORMEINTERNATIONALEINTERNATIONALSTANDARDCEIIEC60821Deuxime ditionSecond edition1991-12B
3、us CEI 821 VMEbus Bus systme microprocesseursPour donnes de 1 octet 4 octetsIEC 821 VMEbus Microprocessor system busfir 1 byte to 4 byte data CEI/ISO 1991 Droits de reproduction rservs Copyright-all rights reservedAucune partie de cette publication ne peut tre reproduite ni?No part of this publicati
4、on may be reproduced or utilized inutilise sous quelque forme que ce soit et par aucun?any form or by any means,electronic or mechanical,procd,lectronique ou mcanique,y compris la photo-?including photocopying and microfilm,without permission incopie et les microfilms,sans laccord crit de lditeur.?w
5、riting from the publisher.International Electrotechnical Commission?3,rue de Varemb Geneva,SwitzerlandTelefax:+41 22 919 0300?e-mail:inmailiec.ch?IEC web site http:/www.iec.chISOLICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.-2-?821 C
6、EISOMMAIREPagesAVANT-PROPOS?20CHAPITRE 0:INTRODUCTIONSections?0.1?Domaine dapplication?22?0.2?Rfrences normatives?22?0.3?Note au lecteur?22CHAPITRE 1:INTRODUCTION A LA NORME DU BUS CEI 8211.1?Objectifs de la norme du BUS CEI 821?241.2?Elments du systme dinterface BUS CEI 821?241.2.1 Dfinitions gnral
7、es?241.2.1.1 Termes utiliss pour dcrire la structure mcanique du BUS CEI 821?241.2.1.2 Termes utiliss pour dcrire la structure fonctionnelle du BUS CEI 821?261.2.1.3 Types de cycles du BUS CEI 821?301.2.2 Structure gnrale du BUS CEI 821?321.3?Diagrammes de la norme du BUS CEI 821?401.4?Terminologie
8、utilise dans la norme?401.4.1 Etats des lignes de signaux?421.4.2 Utilisation de lastrisque(*)?441.5?Spcification du protocole?441.5.1 Signaux dinterverrouillage du bus?461.5.2 Signal de diffusion du bus?461.6?Exemples et explications relatifs au systme?48CHAPITRE 2:BUS DE TRANSFERT DE DONNEES DU BU
9、S CEI 8212.1?Introduction?502.2?Lignes du bus de transfert de donnes?502.2.1 Lignes dadresse?542.2.2 Lignes de modification dadresse?562.2.3 Lignes de donnes?602.2.4 Lignes de commande du bus de transfert de donnes?622.2.4.1 AS*?622.2.4.2 DSO*et DS1*?622.2.4.3 DTACK*?642.2.4.4 BERR*?642.2.4.5 WRITE*
10、?662.3?Modules DTB-Description gnrale?662.3.1 MAITRE?662.3.2 ESCLAVE?722.3.3 LIMITEUR DE TEMPS DOCCUPATION DU BUS?762.3.4 DETECTEUR DACCES?802.3.5 Modes dadressage?822.3.6 Possibilits de base de transferts de donnes?862.3.7 Possibilits de transferts par bloc?922.3.8 Possibilits de lecture-modificati
11、on-criture?982.3.9 Possibilits de transferts non aligns?102LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.821 IEC?-3-CONTENTSPageFOREWORD?21CHAPTER 0:INTRODUCTIONSection0.1?Scope?230.2?Normative references?230.3?Note to the reader?23C
12、HAPTER 1:INTRODUCTION TO THE IEC 821 BUS STANDARD1.1?IEC 821 BUS standard objectives?251.2?IEC 821 BUS interface system elements?251.2.1 Basic definitions?251.2.1.1 Terms used to describe the IEC 821 BUS mechanical structure?251.2.1.2 Terms used to describe the IEC 821 BUS functional structure?271.2
13、.1.3 Types of cycles on the IEC 821 Bus?311.2.2 Basic IEC 821 BUS structure?331.3?IEC 821 BUS standard diagrams?411.4?Standard terminology?411.4.1 Signal line states?431.4.2 Use of the asterisk(*)?451.5?Protocol specification?451.5.1 Interlocked bus signals?471.5.2 Broadcast bus signal?471.6?System
14、examples and explanations?49CHAPTER 2:IEC 821 BUS DATA TRANSFER BUS2.1?Introduction?512.2?Data Transfer Bus lines?512.2.1 Addressing lines?552.2.2 Address modifier lines?572.2.3?Data lines?612.2.4 Data Transfer Bus control lines?632.2.4.1 AS*?632.2.4.2 DSO*and DS1*?632.2.4.3 OTACY.*?652.2.4.4 BERR*?
15、652.2.4.5 WRITE*?672.3?DTB modules-Basic description?672.3.1 MASTER?672.3.2 SLAVE?732.3.3 BUS TIMER?772.3.4 LOCATION MONITOR?812.3.5 Addressing modes?832.3.6 Basic data transfer capabilities?872.3.7 Block transfer capabilities?932.3.8 Read-modify-write capabilities?992.3.9 Unaligned transfer capabil
16、ities?103LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.821 CEISections?Pages2.3.10 Possibilit UNIQUEMENT DADRESSAGE?1082.3.11 Interaction entre les modules fonctionnels du DTB?1082.4?Fonctionnement typique?1122.4.1 Cycles typiques de transfert de donnes?1122.4.2?Anticipation dadresse?1222.5?Acquisition du bus de transfert de donnes?1242.6?Rgles et observations de squencement du DTB?128CHAPITRE 3:ARBITRAGE DU BUS DE TRANSFERT DE D
