电子专业参赛课件 数字电子技术(课件)lec10

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1、2021/7/1Chapter6FunctionsofCombinationalLogic1Chapter6OutlineLecture10:AddersandComparators6-1BasicAdders6-2ParallelBinaryAdders6-3RippleCarryvs.Look-AheadCarryAdders6-4Comparators6-5Decoders6-6Encoders6-8Multiplexers(DataSelectors)6-9Demultiplexers(Datadistributo

2、rs)6-7CodeConverters6-10ParityGenerators/Checker****DigitalSystemApplicationLecture10Lecture11/12Lecture13Lecture142021/7/1Chapter6FunctionsofCombinationalLogic2KeyKnowledgeinLecture10Lecture10:AddersandComparatorsBasicaddersanditslogicdiagram;Characteristicsofthe

3、ripplecarrytypeandlook-aheadcarrytypeadder;Adderexpansionthroughcascading;Comparatorworkingprinciple;Comparatorexpansionthroughcascading;DifficultTopics:1.Look-aheadcarryadder;2.Adderandcomparatorexpansion.2021/7/1Chapter6FunctionsofCombinationalLogic3BasicAddersL

4、ecture10:AddersandComparatorsAddersareimportantincomputersandalsoinothertypesofdigitalsystemsinwhichnumericdataareprocessed.Anunderstandingofthebasicadderoperationisfundamentaltothestudyofdigitalsystem.TheHalf-AdderSimpleBinaryAddition0+0=00+1=11+0=11+1=10Zeroplus

5、zeroequalszeroZeroplusoneequalsoneOnepluszeroequalsoneOneplusoneequalszerowithacarryofoneOnlyonebinarydigitisadded.2021/7/1Chapter6FunctionsofCombinationalLogic4LogicSymbolforaHalf-AdderLecture10:AddersandComparatorsThehalfadderacceptstwobinarydigitsonitsinputsand

6、producestwobinarydigitsonitsoutputs,asumbitandacarrybit.Theinputshavenocarrybit.OpenfileF06-01toverifyoperation.TwoinputsTwooutputs2021/7/1Chapter6FunctionsofCombinationalLogic5Half-AdderLogicLecture10:AddersandComparators0110111001010000COutBAAdditioniscarriedout

7、usingexclusiveOR.Half-AdderTruthTable2021/7/1Chapter6FunctionsofCombinationalLogic6Half-AdderLogicDiagramLecture10:AddersandComparators2021/7/1Chapter6FunctionsofCombinationalLogic7TheFull-AdderLecture10:AddersandComparatorsLogicsymbolforafull-adder.Thefull-addera

8、cceptstwoinputbitsandaninputcarryandgeneratesasumoutputandanoutputcarry.OpenfileF06-03toverifyoperation.FromlowerbitIfmorethanonebinarybitsareadded,full