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1、电子科技大学2014-2015学年第二学期期中考试卷课程名称：数字逻辑设计及应用考试形式：闭卷考试日期：2015年5月10日考试时长：120分钟课程成绩构成：平时30/20%，期中30/20%，小班讨论0/20%，期末40%本试卷试题由__VII___部分构成，共__6___页。题号IIIIIIIVVVIVII合计得分得分I.Pleasefilloutthecorrectanswersinthebrackets“()”.(2’X20=40’)1.[510.5]10=(111111110.1)2=(1FE.8)162.(2015)10=(0010000000010101)8421
2、BCD=(0101001101001000)Excess-33.IfX’ssigned-magnituderepresentationXSMis000110102,then(2X)’s8-bittwo’scomplementrepresentationis(00110100),and(-X/2)’s8-bittwo’scomplementrepresentationis(11110011).4.Ifalogicfunctionis,itscomplementexpressionis(0,4,5,7),anditsdualexpressionis.(0,2,3,7)5.ForCM
3、OSinverters,candifferentoutputsofcommonCMOSinvertersbeconnectedtogether?[YesorNo](No);Three-stateinvertershavethree-stateoutputs,whichareHIGH、LOWand(Hi-Z).Candifferentoutputsofthree-stateinvertersbeconnectedtogether?[YesorNo](Yes).6.GivenabinarynumberX=101101012,itscorrespondingGraycodeis(11
4、101111).7.If[X]two’s-complement=011100112,[Y]two’s-complement=100111002,then[X-Y]two’s-complement=（10101001），whetheroverflowoccurs?[YesorNo](Yes).8.Given126differentstates,itrequiresatleast(7)binarybitstorepresentthem.9.ForCMOSNORgates,theirunusedinputsshouldconnectto(0)state.10.FromTable1be
5、low,if74HCdevicesdrive74LSdevices,inHIGHstate,DCnoisemarginVNHis(1.84),Fan-outNHis(200);inLOWstate,DCnoisemarginVNLis(0.47),Fan-outNLis(10).Table1FamilyDescriptionSymbol74LS74HCLOW-levelinputvoltage(V)VILmax0.81.35LOW-leveloutputvoltage(V)VOLmax0.50.33HIGH-levelinputvoltage(V)VIHmin2.03.85HI
6、GH-leveloutputvoltage(V)VOHmin2.73.84LOW-levelinputcurrent(uA)IILmax-4001LOW-leveloutputcurrent(mA)IOLmax84HIGH-levelinputcurrent(uA)IIHmax20-1HIGH-leveloutputcurrent(mA)IOHmax-0.4-4得分II.Choosethecorrectanswerandfilltheitemnumberinthebrackets.(Singleselectionforquestion1~8,Multi-selectionfor
7、9~10,2’X10=20)1.Forlogicfunction,itsminimalsumis(C)A.B.C.D.2.Givenacircuitdesign,itsoutputexpressionwithpositivelogicis,thenitsoutputexpressionwithnegativelogicis(C)A.B.C.D.3.Forthepriorityencoder74X148,itsinputsare:I0-L,I1-L,I2-L,I3-L,I4-L,I5-L,I6
