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1、电了类面试题冃TheconceptofFPGAandASIC,theirdifferences・A:FPGAisprogrammableASIC・ASIC:specialintegratedcircuit,whichisdesignedandmanufacturedforasingleuser・Setuptimeandholdtime?A:establishmenttimeisthetimewhentheclocksignalofthetriggerincreasesalongthetimethatthedat
2、aisstable・InputsignalshouldbeclockrisingedgeaheadsuchasrisingalongtheeffectiveTtimethechip,theTistosetuptime一theSetuptime・Ifyoudon，tsatisfytheSetuptime,thedatacan，tbeaclockintothetrigger,isonlythenextclockrisealong,datacanbeintothetrigger・Keepingtimeisthetim
3、ewhentheclocksignalofthetriggerincreasesalongthetimethatthedataisstable・Ifholdtimeisnotenough,thedatacan，tbeaddedtothetrigger・Ifyoudon，tmeetthesetupandmaintenancetime,thenDFFwillnotbeabletosamplethedatacorrectlyandwillhaveametastable(metestable)condition.Ift
4、hedurationofthedatabeforeandafterthesignalalongthetriggerintheclockthantobuildandmaintaintime,thenmorethantheamountrespectivelyreferredtoasthebuildtimealIowaneeandkeeptimeallowance・Whatiscompetitionandrisk?Howtojudge?Howtoeliminate?A:incombinatoriallogic,the
5、timeofarrivalofthegateisnotuniformlycalledcompetitionduetodifferentdelaysintheinputsignalpathofthedoor・Theproductionofaburrisanadventure・IfthereisanoppositesigninBoolean,thereisariskofcompetitionandrisk-taking・Solulion:oneistoaddBooleaneliminationitems,andth
6、eotheristoaddcapacitanceoutsidethechip・Whatisthedifferencebetweenasynchronouscircuitandanasynchronouscircuit?Answer:synchronouscircuit,storagecircuitinalloftheclockinputtriggersthesameclocksource,andthereforeallthestatuschangeofthetriggerandthesynchronousclo
7、ckpulsesigna1.Asynchronouscircuit,clockcircuitisnotregulated,andsomeoftheflip-flopistheinputterminalconnectedtotheclockpulsesource,thisisthetriggerconditionchangeandclocksynchronization,whiletherestofthetriggerdoesnotchangewiththestateoftheclocksynchronizati
8、on・WhatisNMOS,PMOS,andCMOS?Whatisenhancedanddepleted?WhatisaPNPandNPN?WhatJsthedifference?A:MOSFieldEffecttubeisthemetal-oxide-semiconductorFieldEffecttube,whichisknownastheMOSFET,whichisaninsul
