基于时钟偏斜调度的vlsi时序优化方法分析

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1、-------ABSTRACTABSTRACTIndigitalIC(IntegratedCircuits)design，theclocksignalismostimportant.It playsacriticalroleonthefunction,timingandstabilityofsynchronousdigitalsystems. Methodsoftraditionalorearlyclocktreesynthesisareexpectedtoobtainazeroskew clocktree.However,itisprovedthatzeroclockskewisnotopt

2、imalstrategy.Clock skewcanbeusedtoimprovetimingperformanceandreliabilityofcircuits.Themain contentsofthisthesiscanbedividedintothefollowingsections:(1)Firstly,itintroducestheoriginofclockskewandtheimpactsontimingand stabilityofcircuits.Traditionalstrategyofclocktreesynthesisisalsointroduced. Relatio

3、nshipsbetweenclockskewandminimum-periodofcircuitsareconcludedfrom theoperatingprincipalofflip-flopsandlathes.(2)Secondly,PipeliningandRetimingtechniquesoftraditionalzeroclockskew optimizationmethodswillbeintroducedandanalyzed.Itexplorestheapplicationfields andshortcomingsofthesetwooptimizationmethod

4、s.AndthenClockSkewScheduling algorithmispresentedtoimprovetimingperformance.(3)ItmainlyanalyzesandstudiestheimpactsofClockSkewScheduling(CSS)on circuittimingandstability.TheimplementationofCSSwillbeanalyzed.Withthehelp ofIBMCPLEXoptimizationsoftware,theISCAS’89circuitsarechosenasbenchmarks toverifya

5、ndtestthealgorithmofCSS.Experimentalresultsshowthatcomparedwith theconventionalzeroclockskewstrategy,theaverageimprovementsinminimumclock periodforflip-flopscircuitsis28%andforlatchescircuitsis14%.(4)ThisthesisanalyzestheimpactsofClockSkewSchedulingoncircuitstability. Thecompensationmethodandcostfun

6、ctionmethodoptimizestabilitywillbe implementedandsolvedbyIBMCPLEXsoftware.Experimentalresultsshowthatthe twomethodshaveimprovedstabilityattheexpenseoftimingperformance.Itis impossibletooptimizetimingperformanceandreliabilityatthesametime.(5)Usually,TheDelayInsertionmethodisusedtofixtimingviolationsa

7、nd improvestabilityduringICdesign.ThisthesisproposestheDelayInsertionUsing ClockSkewSchedulingmethodtooptimizetimingperformanceandimprovecircuit stability.UnderthehelpofCPLEX,theoptimizationmethodisim