Digital Logic Circuits 數(shù)字邏輯電路智慧樹知到答案章節(jié)測試2023年南京理工大學(xué)

第一章測試Thenumberofvaluesthatcanbeassignedtoabitare(

)

A:three

B:ten

C:two

D:one

答案:CComparedtoanalogsystems,digitalsystems(

)

A:

alloftheabove

B:

canrepresentaninfinitenumberofvalues

C:canhandlemuchhigherpower

D:arelesspronetonoise

答案:DThetermbitmeans(

)

A:a1ora0

B:binarydigit

C:asmallamountofdata

D:

bothanswers(b)and(c)

答案:DAquantityhascontinuousvalueis(

)

A:adigitalquantity

B:abinaryquantity

C:ananalogquantity

D:anaturalquantity

答案:CVerilogHDLisa(

)

A:

hardware

B:computerlanguage

C:logicdevice

D:programminglogicdevice

答案:BAcategoryofdigitalintegratedcircuitshavingfunctionsthatcanbealteredisknownasfixed-functionlogic.

A:對

B:錯

答案:BDataareinformationonlyinnumeric.

A:錯

B:對

答案:ATwobroadtypesofdigitalintegratedcircuitsarefixed-functionandprogrammble.

A:錯

B:對

答案:BThenonrecurringengineering(NRE)costforanASICdesignisnormallylow.

A:對

B:錯

答案:BThereisan“invalid”regionbetweentheinputrangesforlogic0andlogic1

A:錯

B:對

答案:B第二章測試Forthebinarynumber10000,theweightofthecolumnwiththe1is(

)

A:8

B:10

C:

4

D:16

答案:DThe2’scomplementof1000is(

)

A:0111

B:1010

C:1000

D:1001

答案:CThefractionalbinarynumber0.11hasadecimalvalueof(

)

A:?

B:noneoftheabove

C:

?

D:

?

答案:AThenumber1100inBCDis(

)

A:

equaltodecimaleight

B:equaltodecimaltwelve

C:invalid

D:equaltodecimalten

答案:CAnexampleofanunweightedcodeis(

)

A:Graycode

B:BCD

C:decimal

D:binary

答案:AAnexampleofanalphanumericcodeis(

)

A:CRC

B:ASCII

C:hexadecimal

D:BCD

答案:BTheoverflowoccurswhenaddingthefollowing8-bittwo’scomplementnumber:01011101+00110001

A:對

B:錯

答案:ATheoverflowdoesNOToccurwhenaddingthefollowing8-bittwo’scomplementnumber:10111111+11011111

A:對

B:錯

答案:AIngeneral,weneedatmostbitstoexpresstheproductwhenmultiplyingann-bitnumberbyanm-bitnumber.

A:錯

B:對

答案:AAnadditionoverflowsiftheaddends’signsarethesamebutthesum’ssignisdifferentfromtheaddends’.

A:對

B:錯

答案:A第三章測試TheBooleanexpressionA

.

1isequalto(

).

A:A

B:B

C:0

D:1

答案:ATheBooleanexpressionA

+1isequalto(

).

A:1

B:B

C:A

D:0

答案:ATheBooleanequationAB+AC=A(B+C)illustrates(

)

A:DeMorgan’stheorem

B:thedistributionlaw

C:

theassociativelaw

D:

thecommutativelaw

答案:BTheassociativelawforadditionisnormallywrittenas(

)

A:AB=BA

B:A+AB=A

C:

(A+B)+C

=A

+(B+C)

D:A+B=B+A

答案:CABooleanexpressionthatisinstandardSOPformis(

)

A:theminimumlogicexpression

B:containsonlyoneproductterm

C:haseveryvariableinthedomainineveryterm

D:noneoftheabove

答案:CAdjacentcellsonaKarnaughmapdifferfromeachotherby

A:threevariables

B:

onevariable

C:twovariables

D:answerdependsonthesizeofthemap

答案:BSOPstandardformisusefulforconstructingtruthtablesorforimplementinglogicinPLDs.

A:錯

B:對

答案:BLogicsimplificationisstillusefulinnowadaysFPGAdesigns.

A:錯

B:對

答案:AInsynthesis,anetlistwillbegeneratedtodescribethecircuitcompletely.

A:對

B:錯

答案:AInFPGAdesign,thestepthat“maps”thedesignfromthenetlisttofitittoatargetdeviceisknownas“programming”.

A:對

B:錯

答案:B第四章測試The74138decodercanalsobeusedas(

).

A:

anencoder

B:noneoftheabove

C:

aMUX

D:aDEMUX

答案:DAssumeyouwanttodecodethebinarynumber0011withanactive-LOWdecoder.Themissinggateshouldbe(

).

A:

anANDgate

B:anORgate

C:aNORgate

D:aNANDgate

答案:DToexpanda2-bitparalleladdertoa4-bitparalleladder,youmust(

).

A:usetwo2-bitadderswithnointerconnections

B:usetwo2-bitadderswiththecarryoutputofoneconnectedtothecarryinputoftheother

C:usetwo2-bitaddersandconnectthesumoutputsofonetothebitinputsoftheother

D:usefour2-bitadderswithnointerconnections

答案:BIfanhex-to-binarypriorityencoderhasits0,3,6,and14inputsattheactivelevel,theactive-HIGHbinaryoutputis(

).

A:0110

B:0011

C:0000

D:1110

答案:DThecontinuousassignmentassignOUT=

select?A:B;specifiestheconditionthatOUT=

()

ifselect=

1,elseOUT=

()

ifselect=

0.

A:

0,1

B:1,0

C:

A,B

D:B,A

答案:CConsidertheinitial

blockinthefollowing:initialbeginA=0;B=0;#10A=1;#20A=0;B=1;EndThenatt=30,Ais

changedto(

)andBto(

).

A:

1,1

B:0,1

C:1,0

D:0,0

答案:BTheinitialstatementexecutesonlyonce,startingfrom

simulationtime0,andmaycontinuewithanyoperationsthataredelayedbyagiven

numberoftimeunits.

A:錯

B:對

答案:BInVerilogHDL,thedefinitionsofmodulesareallowedtobenested.

A:對

B:錯

答案:BThevaluezrepresentsanunknownlogicvalueinVerilogHDL.

A:錯

B:對

答案:AInVerilogHDL,~(1010)is(0101),and!(1010)is0.

A:對

B:錯

答案:A第五章測試

TheoutputofaDlatchwillnotchangeif(

).

A:Enableisnotactive

B:alloftheabove

C:DisLOW

D:

theoutputisLOW

答案:ATheDflip-flopshownwill(

).

A:resetonthenextclockpulse

B:setonthenextclockpulse

C:toggleonthenextclockpulse

D:latchonthenextclockpulse

答案:CFortheJ-Kflip-flopshown,thenumberofinputsthatareasynchronousis(

).

A:2

B:4

C:1

D:3

答案:AAssumetheoutputisinitiallyHIGHonaleadingedgetriggeredJ-Kflipflop.Fortheinputsshown,theoutputwillgofromHIGHtoLOWonwhichclockpulse?

A:3

B:4

C:1

D:2

答案:AThetimeintervalillustratediscalled(

).

A:set-uptime

B:tPLH

C:holdtime

D:tPHL

答案:BTheadvantageofdynamicRAMoverstaticRAMisthat(

).

A:itdoesnotrequirerefreshing

B:itismuchfaster

C:alloftheabove

D:itissimplerandcheaper

答案:DAnasynchronous

resetsignalwilloverridetheclockonaFF.

A:對

B:錯

答案:AInVerilogHDL,aninitialbehavioralstatementexecutesonlyonce.

A:對

B:錯

答案:AInaMoore

model,theoutputsofthesequentialcircuitarenotsynchronizedwiththe

clock.

A:對

B:錯

答案:BTheoutputoftheMealy

machineisthevaluethatispresentimmediatelybeforethe

activeedgeoftheclock.

A:錯

B:對

答案:B第六章測試TocauseaDflip-floptotoggle,connectthe(

).

A:clocktotheD

input

B:clocktothepresetinput

C:

D:

Q

outputtotheD

input

答案:CA4-bitbinarycounterhasaterminalcountof(

).

A:15

B:16

C:10

D:4

答案:AAssumetheclockfora4-bitbinarycounteris80kHz.Theoutputfrequencyofthefourthstage(Q3)is(

).

A:320kHz

B:5kHz

C:10kHz

D:20kHz

答案:BA4-bitparallel-in/parallel-outshiftregisterwillstoredatafor(

).

A:3clockperiods

B:1clockperiod

C:4clockperiods

D:2clockperiods

答案:BAnadvantageofaringcounteroveraJohnsoncounteristhattheringcounter(

).

A:allowsonlyonebittochangeatatime

B:hasmorepossiblestatesforagivennumberofflip-flops

C:isclearedaftereachcycle

D:isself-decoding

答案:DApossiblesequencefora4-bitringcounteris(

).

A:…0000,0001,0010…

B:…1111,1110,1101…

C:

…0001,0011,0111…

D:

…1000,0100,0010…

答案:DAdivide‐by‐N-counterisacounterthatgoesthrougharepeated

sequenceofNstates,anditisalsoknownasamodulo‐Ncounter.

A:對

B:錯

答案:AForcounterswithunusedstates,itisnecessarytoensurethatthecircuiteventuallygoesintooneofthevalidstatessothatitcanresumenormaloperation.

A:對

B:錯

答案:AFortransmission,datafromaUARTissentin

synchronousparallelform.

A:錯

B:對

答案:AThemaximummodulusofacounteris,

wherenisthenumberofstages(flip-flops)inthecounter.

A:錯

B:對

答案:A第七章測試StaticRAMis(

).

A:volatileread/writememory

B:

nonvolatileread/writememory

C:volatilereadonlymemory

D:nonvolatilereadonlymemory

答案:AAnonvolatilememoryisonethat(

)

A:mustberefreshedregularly

B:alloftheabove

C:

retainsdatawithoutpowerapplied

D:

requiresaclock

答案:CTheadvantageofdynamicRAMoverstaticRAMisthat(

).

A:itissimplerandcheaper

B:itdoesnotrequirerefreshing

C:itismuchfaster

D:alloftheabove

答案:AA4-bitparallel-in/parallel-outshiftregisterwillstoredatafor(

).

A:2clockperiod

B:4clockperiod

C:3clockperiod

D:1clockperiod

答案:DWhendataisreadfromRAM,thememorylocationis(

).

A:settoall1’safterthereadoperation

B:unchanged

C:destroyed

D:clearedafterthereadoperation

答案:BThefirststepinareadorwriteoperationforarandomaccessmemoryisto(

).

A:placeavalidaddressontheaddressbus

B:enablethememory

C:startarefreshcycle

D:

sendorobtainthedata

答案:AAddressmultiplexingcanreducethenumberofpinsintheICpackage.

A:對

B:錯

答案:AOneofthemajorapplicationsofSRAMsisincachememoriesincomputers.

A:錯

B:對

答案:BRAMisusedinacomputerto

storetheBIOS(BasicInput/Output

System.

A:對

B:錯

答案:BMemoryexpansion

isaccomplishedbyaddinganappropriatenumberofmemorychipstotheaddress,data,

andcontrolbuses.

A:錯

B:對

答案:B第八章測試Thenumberofcomparatorsrequiredina10-bitflashADCis(

).

A:511

B:255

C:4095

D:1023

答案:DIfananti-aliasingfilterisnotusedindigitizingasignaltherecoveryprocess(

)

A:isslowed

B:mayincludealiassignals

C:alloftheabov