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时间: 2019-12-25 02:12
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ISAISABusTimingDiagramsSBS’sISAbustimingdiagramsarederivedfromdiagramsintheIEEEP996draftspecificationwhichwere,inturn,derivedfromthetimingoftheoriginalIBMATcomputer.PleasenotethattheIEEEP996draftspecificationwasnevercompletedbytheIEEEandisnotanIEEEapprovedspec.Also,the“latest”IEEEdraftisknowntocontainerrors.IntheabsenceofanapprovedIEEEspecification,manufacturersofPCchipsetsattempttomeeta“consensus”ISAbusstandard.ThishasresultedinminorvariationsinsignalinterpretationandtimingamongthevariousPCchipsetvendors.Forthisreason,SBSrecommendsthatdesignersofinterfacestotheISAbususetheminimumnumberofbussignalsneededtoperformarequiredfunction(e.g.chipselectionorsignalsync……