EmbeddedSystemDesign《嵌入式系统设计》课后答案(英文版)(19)

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2.7ExplainwhyNANDandNORgatesaremorecommonthanANDandORgates.

BecausepMOStransistorsdon'tconductzerosverywellandnMOStransistorsdon'tconductonesverywell,ANDandORgatesaredesignedbyusingNANDandNORgates,respectively,alongwithaninvertor.Thus,NANDandNORgatesaremorecommonduetotheirreducedsize.

2.8Distinguishbetweenacombinationalcircuitandasequentialcircuit.

Acombinationalcircuitisadigitalcircuitwhoseoutputispurelyafunctionofitspresentinputs.Asequentialcircuitisadigitalcircuitwhoseoutputsareafunctionofthepresentaswellasthepreviousinputvalues.

2.9Designa2-bitcomparator(comparestwo2-bitwords)withasingleoutput“less-than,”

usingthecombinationaldesigntechniquedescribedinthechapter.Startfromatruthtable,useK-mapstominimizelogic,anddrawthefinalcircuit.a1

1

1

1

1

1

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1a00000111100001111b10011001100110011b0010101010

1010101lt(a<b)0111001100010000aab1blt=b1a1'+b0a1'a0'+b1b0a0'a1a0b1b0lt

EmbeddedSystemDesign17

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