数字逻辑设计及应用教学课件：复习卷子2.ppt

《数字逻辑设计及应用教学课件：复习卷子2.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、练习题2一、Tofillyouranswersintheblanks（1’×25）6.AsequentialcircuitwhoseoutputdependsonthestatealoneiscalledaMooremachine.7.Todesigna"001010"serialsequencegeneratorbyshiftregisters,theshiftregistershouldneed4bitasleast.8.Ifweusethesimpleststateassignmentmethodfor130sates,thenweneedatleast8statevariables.9

2、.OnestatetransitionequationisQ*=JQ'+K'Q.IfweuseDflip-floptocompletetheequation,theDinputterminalofDflip-flopshouldbehavethefunctionD=JQ'+K'Q.WhichstateinFig.1isambiguousD13.IfaRAM’scapacityis16Kwords×8bits,theaddressinputsshouldbe14bits;Weneed8chipsof8K8bitsRAMtoforma16K32bitsROM..14.WhichistheXOR

3、gateofthefollowingcircuitA.15.Thereare2n－ninvalidstatesinann-bitringcounterstatediagram.ThefunctionofaDACistranslatingtheDigitalinputstothesamevalueofanalogoutputs.二、CompletethefollowingtruthtableoftakingavotebyA,B,C,whenmorethantwoofA,B,Capprovearesolution,theresolutionispassed;atthesametime,theres

4、olutioncan’tgothroughifAdon’tagree.ForA,B,C,assume1isindicatedapproval,0isindicatedopposition.FortheF,assume1ispassed,0isrejected.（5’）三、ThecircuittothebelowrealizesacombinationalfunctionFoffourvariables.FillintheKarnaughmapofthelogicfunctionFrealizedbythemultiplexer-basedcircuit.(6’)四、(A)Minimizethe

5、logicfunctionexpressionF=A·B+AC’+B’·C+BC’+B’D+BD’（5’）F=A·B+AC’+B’·C+BC’+B’D+BD’=A·(B’C)’+B’·C+BC’+B’D+BD’=A+B’·C+BC’+B’D+BD’+C’D(或=A+B’·C+BC’+B’D+BD’+CD’)=A+B’·C+BD’+C’D(或=A+BC’+B’D+CD’)(B)TofindtheminimumsumofproductforFanduseNAND-NANDgatestorealizeit（6’）Π(1,3,4,6,9,11,12,14)F=X’Z’+XZ=(X’Z’+XZ)’’=(

6、(X’Z’)’(XZ)’)’五、Realizethelogicfunctionusingonechipof74LS139andtwoNANDgates.（8’）六、Designaself-correctingmodulo-6counterwithDflip-flops.Writeouttheexcitationequationsandoutputequation.Q2Q1Q0denotethepresentstates,Q2*Q1*Q0*denotethenextstates,Zdenotetheoutput.Thestatetransition/outputtableisasfollowin

7、g.（10’）激励方程式：D2=Q0’D1=Q2D0=Q1修改自启动：D2=Q0+Q2Q1’D1=Q2+Q1Q0’D0=Q1+Q2Q0输出方程式：Z=Q1’Q0七、Constructaminimalstate/outputtableforamooresequentialmachine,thatwilldetecttheinputsequences:x=101.Ifx=101isdetected,t