数字电子技术(Floyd 第十版)课件Chapter -03-stPPT课件下载推荐.ppt
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数字电子技术(Floyd 第十版)课件Chapter -03-stPPT课件下载推荐.ppt
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,A,X,A,X,Agroupofinverterscanbeusedtoformthe1scomplementofabinarynumber:
Binarynumber,1scomplement,10001101,01110010,TheANDgateproducesaHIGHoutputwhenallinputsareHIGH;
otherwise,theoutputisLOW.Fora2-inputgate,thetruthtableis,Summary,TheANDGate,TheANDoperationisusuallyshownwithadotbetweenthevariablesbutitmaybeimplied(nodot).Thus,theANDoperationiswrittenasX=A.BorX=AB.,00011011,0001,A,B,X,A,B,X,Summary,Examplewaveforms:
A,X,TheANDoperationisusedincomputerprogrammingasaselectivemask.Ifyouwanttoretaincertainbitsofabinarynumberbutresettheotherbitsto0,youcouldsetamaskwith1sinthepositionoftheretainedbits.,TheANDGate,A,B,X,B,A,B,X,Summary,00000011,Example,Ifthebinarynumber10100011isANDedwiththemask00001111,whatistheresult?
Summary,TheANDGate,AMultisimcircuitisshown.XWG1isawordgeneratorsetinthecountdownmode.XLA1isalogicanalyzerwiththeoutputoftheANDgateconnectedtofirst(upper)lineoftheanalyzer.Whatsignaldoyouexpecttoonthisline?
Example,Solution,Theoutput(line1)willbeHIGHonlywhenalloftheinputsareHIGH.,TheORgateproducesaHIGHoutputifanyinputisHIGH;
ifallinputsareLOW,theoutputisLOW.Fora2-inputgate,thetruthtableis,Summary,TheORGate,TheORoperationisshownwithaplussign(+)betweenthevariables.Thus,theORoperationiswrittenasX=A+B.,00011011,0111,A,B,X,A,B,X,Summary,Examplewaveforms:
A,X,TheORoperationcanbeusedincomputerprogrammingtosetcertainbitsofabinarynumberto1.,TheORGate,B,A,B,X,A,B,X,Summary,Example,ASCIIlettershavea1inthebit5positionforlowercaselettersanda0inthispositionforcapitals.(Bitpositionsarenumberedfromrighttoleftstartingwith0.)WhatwillbetheresultifyouORanASCIIletterwiththe8-bitmask00100000?
Solution,Theresultingletterwillbelowercase.,Summary,TheORGate,AMultisimcircuitisshown.XWG1isawordgeneratorsettocountdown.XLA1isalogicanalyzerwiththeoutput,Example,Solution,Theoutput(line1)willbeHIGHifanyinputisHIGH;
otherwiseitwillbeLOW.,connectedtofirst(top)lineoftheanalyzer.Thethree2-inputORgatesactasasingle4-inputgate.Whatsignaldoyouexpectontheoutputline?
TheNANDgateproducesaLOWoutputwhenallinputsareHIGH;
otherwise,theoutputisHIGH.Fora2-inputgate,thetruthtableis,Summary,TheNANDGate,00011011,1110,A,B,X,A,B,X,Summary,Examplewaveforms:
A,X,TheNANDgateisparticularlyusefulbecauseitisa“universal”gateallotherbasicgatescanbeconstructedfromNANDgates.,TheNANDGate,B,A,B,X,A,B,X,Summary,TheNANDGate,Question,Howwouldyouconnecta2-inputNANDgatetoformabasicinverter?
Summary,TheNANDGate,AMultisimcircuitisshown.XWG1isawordgeneratorsetinthecountupmode.Afour-channeloscilloscopemonitorstheinputsandoutput.Whatoutputsignaldoyouexpecttosee?
Example,Solution,Theoutput(channelD)willbeLOWonlywhenalloftheinputsareHIGH.,Inputs,TheNORgateproducesaLOWoutputifanyinputisHIGH;
ifallinputsareHIGH,theoutputisLOW.Fora2-inputgate,thetruthtableis,Summary,TheNORGate,00011011,1000,A,B,X,A,B,X,Summary,Examplewaveforms:
A,X,TheNORoperationwillproduceaLOWifanyinputisHIGH.,TheNORGate,B,A,B,X,A,B,X,Summary,Example,WhenistheLEDisONforthecircuitshown?
Solution,TheLEDwillbeonwhenanyofthefourinputsareHIGH.,TheXORgateproducesaHIGHoutputonlywhenbothinputsareatoppositelogiclevels.Thetruthtableis,Summary,TheXORGate,00011011,0110,A,B,X,A,B,X,Summary,Examplewaveforms:
A,X,NoticethattheXORgatewillproduceaHIGHonlywhenexactlyoneinputisHIGH.,TheXORGate,B,A,B,X,A,B,X,Summary,Question,IftheAandBwaveformsarebothinvertedfortheabovewaveforms,howistheoutputaffected?
Thereisnochangeintheoutput.,TheXNORgateproducesaHIGHoutputonlywhenbothinputsareatthesamelogiclevel.Thetruthtableis,Summary,TheXNORGate,00011011,1001,A,B,X,A,B,X,Summary,Examplewaveforms:
A,X,NoticethattheXNORgatewillproduceaHIGHwhenbothinputsarethesame.Thismakesitusefulforcomparisonfunctions.,TheXNORGate,B,A,B,X,A,B,X,Summary,Question,IftheAwaveformisinvertedbutBremainsthesame,howistheoutputaffected?
Theoutputwillbeinverted.,A,B,X,TwomajorfixedfunctionlogicfamiliesareTTLandCMOS.AthirdtechnologyisBiCMOS,whichcombinesthefirsttwo.Packagingforfixedfunctionlogicisshown.,Summary,FixedFunctionLogic,DIPpackageSOICpackage,Somecommongateconfigurationsareshown.,Sum
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