上海海事大学数字逻辑试卷

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1、上海事大学试卷2010—2011学年第二学期期末考试:字逻辑(digitallogic)》(A卷)班级学号姓名总分题目得分阅卷人一、填空题（每空1分，共15分）请将正确答案写在题目中的括号内。1、Theperiod（周期）ofthewaveformbelowis，anditsfrequency（频率）is4111,!i1,-I,1-J,.131?7911131517VZ

2、tinputsbutalsodependsonthe.4、A3-variableKarnaughmaphascells.5、A3-bitbinarycounterhasamaximummodulus(模)of，Amodulus-20countermusthaveatleastflip-flops.Amodulus-10ringcounter(环形计数器)requiresflip-flops.6、Thefrequencyofthewaveformat①isandat②is，andtheoverallmodulusis•1①I1②1OOkHz►DIVIO

3、~叫DIV

4、IO

5、►7、Aninputvariablecombinationthatcannotoccur(ornotallowed)canbetreatedas8、Adeviceconsistsofarrangementsofflip-flopswhichcanbeusedtostoreandshiftdatacallsa•二、选择题(每题1分，共计10分)1、Thetermbitmeans()(A)Asmallamountofdata(B)a1ora0(C)binarydigit(D)bothanswers(B)and(C)2、AllBooleanexpressionc

6、anbeimplementedwith()(A)NANDgatesonly(B)NORgatesonly(C)combinationsofANDgates，ORgates，andinverters(D)anyofthese3、ThemodulusofaJohnsoncounter(扭环型计数器)withnflip-flopsis((A)n(B)2n(C)2°_1(D)2n_2n(B)two2-bitbinarynumbers(D)fourbitsatatime4、A4-bitparalleladdercanadd((A)fourbitsinsequence(C)

7、two4-bitbinarynumbers5、Anasynchronous(异步)counterdiffersfromasynchronous(同步)counterin()(A)thenumberofstatesinitssequence(B)themethodofclocking(D)thevalueofthemodulus(B)thegatedS-Rlatch(C)thetypeofflip-flopsused6、Thecircuitwithoutinvalidstateis((A)theS-Rlatch(C)theedge-triggeredS-Rflip

8、-flop(D)theedge-triggeredDflip-flop7、Themodulusofthecounterbelowis((A)5(B)6(C)7(D)88、Thecodethathasanodd-parity(奇校验码)erroris()(A)100110010(B)011101010(C)1011110119、设寄存器A,B均为四个二进制位，则A的高位清0,可由操作()实现。(A)AvOlll^A；(B)AaOIU^A；(C)Av1000^A；(D)AB^A；(E)AaIOOO^A10、A1，A2，A3，A4,A5是五个开关，它们闭合吋为逻辑1,

9、断开吋为逻辑0。电灯F=1时表示灯亮，F=0时表示灯灭。若在五个不同的地方控制同一个电灯的灭亮，逻辑函数F的表达式是F=()。A-A1A2A3A4A5B-A1+A2+A3+A4+A5C.A1㊉A2㊉A3㊉A4㊉A5三、应用题(共7题，共计53分》1、Showtheoutputwaveformxinproperrelationtotheinputswithatimingdiagram.(7point)1111:111iirr1111111賺11111111111111L」1:H1111「:U4-1111:「/3c2、UseaKarnaughmaptoreducet

10、helogicexpre