IEC_60821-1991_amd1-1999.pdfVIP免费

NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD608211991AMENDEMENT1AMENDMENT11999-01JPourprix,voircatalogueenvigueurForprice,seecurrentcatalogueCODEPRIXPRICECODEAmendment1VMEbus–Microprocessorsystembusfor1byteto4bytedataAmendement1BusVMEbus–Bussystèmeàmicroprocesseurspourdonnéesde1octetà4octetsIEC1999DroitsdereproductionréservésCopyright-allrightsreservedInternationalElectrotechnicalCommission3,ruedeVarembéGeneva,SwitzerlandTelefax:+41229190300e-mail:inmail@iec.chIECwebsitehttp://www.iec.chCommissionElectrotechniqueInternationaleInternationalElectrotechnicalCommissionLICENSEDTOMECONLimited.-RANCHI/BANGALOREFORINTERNALUSEATTHISLOCATIONONLY,SUPPLIEDBYBOOKSUPPLYBUREAU.–2–60821Amend.1©IEC:1999(E)FOREWORDThisamendmenthasbeenpreparedbysubcommittee26:Microprocessorsystems,oftheJointTechnicalCommitteeISO/IECJTC1:Informationtechnology.Thetextofthisamendmentisbasedonthefollowingdocuments:TextReportonvotingISO/IECJTC1/SC26N237ISO/IECJTC1/SC26N218Fullinformationthevotingfortheapprovalofthisamendmentcanbefoundinthereportonvotingindicatedintheabovetable.___________CHAPTER2:IEC60821BUSDATATRANSFERBUSPage672.2.4.5WRITE*Replacethefirstsentenceofthissubclausebythefollowing:WRITE*isalevelsignificantsignallinethatisstrobedbythefallingedgeofthefirstdatastrobe(DSA*)andisvalidaslongasanydatastrobe(DSA*orDSB*)islow.Page892.3.6BasicdatatransfercapabilitiesReplaceRule2.65bythefollowing:D08(O)SLAVESMUSTNOTrespondbydrivingDTACK*lowduringcyclesthatrequestaccesstobytelocationsBYTE(0),BYTE(2),BYTE(1-2),BYTE(2-3),BYTE(0-2),BYTE(1-3),orBYTE(0-3).Insert,attheendofSuggestion2.8,thefollowingtext:4)WhenaD08(O)SLAVEisrequestedtodoaBYTE(0)orBYTE(2)transfer.Page93Table2-10–MnemonicsthatspecifybasicdatatransfercapabilitiesReplaceinthethirdcolumnthewords"canaccept"and"canmonitor"by"mustaccept"and"mustmonitor".LICENSEDTOMECONLimited.-RANCHI/BANGALOREFORINTERNALUSEATTHISLOCATIONONLY,SUPPLIEDBYBOOKSUPPLYBUREAU.60821Amend.1©IEC:1999(E)–3–2.3.7BlocktransfercapabilitiesAdd,onpage95,attheendo...