基于时钟偏斜调度的vlsi时序优化方法-研究

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1、ABSTRACTABSTRACTIndigitalIC(IntegratedCircuits)design，theclocksignalismostimportant.Itplaysacriticalroleonthefunction,timingandstabilityofsynchronousdigitalsystems.Methodsoftraditionalorearlyclocktreesynthesisareexpectedtoobtainazeroskewclocktree.However,itisprovedthatzeroc

2、lockskewisnotoptimalstrategy.Clockskewcanbeusedtoimprovetimingperformanceandreliabilityofcircuits.Themaincontentsofthisthesiscanbedividedintothefollowingsections:(1)Firstly,itintroducestheoriginofclockskewandtheimpactsontimingandstabilityofcircuits.Traditionalstrategyofcloc

3、ktreesynthesisisalsointroduced.Relationshipsbetweenclockskewandminimum-periodofcircuitsareconcludedfromtheoperatingprincipalofflip-flopsandlathes.(2)Secondly,PipeliningandRetimingtechniquesoftraditionalzeroclockskewoptimizationmethodswillbeintroducedandanalyzed.Itexploresth

4、eapplicationfieldsandshortcomingsofthesetwooptimizationmethods.AndthenClockSkewSchedulingalgorithmispresentedtoimprovetimingperformance.(3)ItmainlyanalyzesandstudiestheimpactsofClockSkewScheduling(CSS)oncircuittimingandstability.TheimplementationofCSSwillbeanalyzed.Withtheh

5、elpofIBMCPLEXoptimizationsoftware,theISCAS’89circuitsarechosenasbenchmarkstoverifyandtestthealgorithmofCSS.Experimentalresultsshowthatcomparedwiththeconventionalzeroclockskewstrategy,theaverageimprovementsinminimumclockperiodforflip-flopscircuitsis28%andforlatchescircuitsis

6、14%.(4)ThisthesisanalyzestheimpactsofClockSkewSchedulingoncircuitstability.ThecompensationmethodandcostfunctionmethodoptimizestabilitywillbeimplementedandsolvedbyIBMCPLEXsoftware.Experimentalresultsshowthatthetwomethodshaveimprovedstabilityattheexpenseoftimingperformance.It

7、isimpossibletooptimizetimingperformanceandreliabilityatthesametime.(5)Usually,TheDelayInsertionmethodisusedtofixtimingviolationsandimprovestabilityduringICdesign.ThisthesisproposestheDelayInsertionUsingClockSkewSchedulingmethodtooptimizetimingperformanceandimprovecircuitsta

8、bility.UnderthehelpofCPLEX,theoptimizationmethodisimplementedindetails.Wecanmakeus