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组合逻辑电路分析和设计.ppt

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CHAPTER5

CombinationalLogicAnalysisandDesign〔组合逻辑电路分析和设计〕

组合逻辑电路时序逻辑电路components:LogicGatesCombinationallogiccircuitSequentiallogiccircuitcomponents:LogicGates+FlipFlops,LatchesChapter7,8,9,10Chapter5,6theoutputisonlydependedonthecurrentinputsTheoutputisnotonlydependedonthecurrentinputsbutalsodependedonthepaststate

Combinationallogiccircuitchapter5chapter6CombinationallogicAnalysisandDesignFunctionsofcombinationalLogic

5-1BasicCombinationalLogicCircuits5-2CombinationalLogicCircuitsAnalysis5-3ImplementingCombinationalLogic

5-4TheUniversalPropertyofNANDandNORGates5-5CombinationalLogicUsingNANDandNORGates5-6LogicCircuitOperationWithPulseWaveformCHAPTER5CombinationalLogicAnalysisandDesign

AND-ORLogic〔与-或逻辑电路〕AND-OR-InvertLogic〔与-或-非逻辑电路〕Exclusive-ORLogic〔异-或逻辑电路〕5-1BasicCombinationalLogicCircuits

AND-ORLogic

TruthtableINPUTSABCDABCDOUTPUTX0000000100100011010001010110011110001001101010111100110111101111000000010000000100000001101010110001000100011111XX=AB+CDAND-ORLogic

AND-ORInvertLogic

Exclusive-ORLogicABX000110110110Truthtable

Exclusive-NORLogicBooleanexpressionTruthtable

Twoequivalentwaysofimplementingtheexclusive-NORSamelogiccanbeimplementedbydifferentcircuit

5-2CombinationalLogicCircuitsAnalysis

(组合逻辑电路分析)LogicCircuitLogicFunctionX=F(A,B,C)?ThesensorproduceaHIGHwhenthelevelofchemicalinthetankdropsbelowaspecifiedpoint

BCABACA,B,Carelevelsensors.aHIGHisproducedwhenthelevelofchemicalinthetankdropsbelowaspecifiedpoint.AnalysisthefunctionofthecircuitX=AB+BC+AC

BCABACX=AB+BC+ACTruthtableABCABBCACX0000010100111001011101110000000

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