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1、电子科技大学二零壹年至二零一学年第二学期“数字逻辑设计及应用”课程考试题（半期）（120分钟）考试日期2013年5月11日一二三四五六七八九十总分评卷教师I.Tofilltheanswersinthe“()”(2’X15=30)1.[109.75]10=(1101101.11)2=(6D.C)16。2.(2713)10=(0010110100010011)2421BCD.3.([-17]10)’ssigned-magnituderepresentationis(10010001),andits8-bittwo’scomplement
2、representationis(11101111).4.IfX’ssigned-magnituderepresentationXSMis111010,then(2X)’s8-bitsigned-magnituderepresentationis(10110100),and(X/2)’stwo’scomplementrepresentationis(11110011).5.Ifthefunction,thenthecomplementexpressionofthefunctionFis,（0，3，5，6）andits’dualexp
3、ressionis（1,2,4,7）.6．CMOSthree-statebufferhasthree-stateoutputs,HIGH,LOWand(Hi-Z).7．IfAtwo’s-complement=01011010,Btwo’s-complement=10001011,thenwhetheroccursoverflowof-A+B?(YesorNo)[Yes].8．IftheGraycodeis（1110101）gray，thenitscorrespondingbinarynumbercodeis(1011001).9．T
4、hereisastatichazardforthelogiccircuitrealizedaccordingtothelogicexpression,thenthecorrespondinglogicexpressionwiththesamefunctionbutwithoutthestatichazardis(F=A’C’+AD+BC+C’D+A’B或F=A’C’+AD+BC+BD).10．IfVOLmax=0.5V,VOHmin=2.8V,VILmax=0.8V,VIHmin=2.1Vfor74LSseries,thenDCno
5、isemarginisVNL=(0.3)V,VNH=(0.7)V.II.Thereisonlyonecorrectanswerinthefollowingquestions.(3’X10=30)1.Whichisthecorrectoneinthefollowingstatementsforalogicfunction?(A)A.TheminimalexpressionmaybethesumofproductsorproductofthesumsB.Theminimalexpressionistheminimalformwithpr
6、oductofsumsC.TheminimalexpressionistheminimalformwithsumofproductsD.Theminimalexpressionwithsumofproductsisthesamesimplywiththeminimalexpressionwithproductofsums2.Whichofthefollowingstatementsisthewrongonewhenperformarithmeticoperationswithtwobinarynumbers?(C)A.Thereis
7、anoverflowwhenthemostsignificantbit(MSB)generatesacarryoutfortheadditionoftwounsignednumbers.B.ThereisnotanoverflowfortheadditionoftwocomplementswithdifferentMSB.C.ThereisanoverflowwhentheMSBgeneratesacarryoutfortheadditionoftwotwo’scomplements.D.Thesubtractionoftwotwo
8、’scomplementscanberealizedwithadder.3.Thestatichazardofthecombinationlogiccircuitiscausedbythereasonthat(D).A.thecirc
