组合逻辑电路分析和设计.ppt
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