cadence allegro si培训课件lesson6

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1、Lesson6TemplateApplicationsandConstraint-DrivenPlacementCreatetopologiesinSigXplorer.DifferentiatebetweenidealTLineandtracemodels.UsevarioussingletraceandcoupledtracemodelsinSigXplorersimulations.RunCrosstalksimulationsinSigXplorer.Applyatopologytemplate(ElectricalCSet)t

2、oanetorgroupofnetsIntheboarddesign.GetinformationaboutnetsandDRCerrorsintheboarddesign.Performconstraint-drivenplacement.TheAllegroPCBSIDesignFlowPre-PlacementSolutionSpaceAnalysisConstraint-DrivenFloorplanningConstraint-DrivenRoutingPost-RouteDRCPost-RouteAnalysisTheAlle

3、groPCBSIDesignFlowconsistsofthefollowingsixsteps:EYouareHereDoubleClickHeretoOpentheImageAddingTraceModelsYoucanaddLossyTransmissionLinemodelsforsimulationsinSigXplorerSingleConductorTraceModelsMicrostripandStriplineCoupledTraceModelsEdgeCoupledandBroadsideCoupledMicrostr

4、ipandStriplineShieldlayerDielectriclayerTLinesandTraceModelsSinglelinetracemodelCoupledlinetracemodelTLinemodelLossytransmissionlinemodelsTransmissionlinesrepresenttheinterconnect.Youcanmodifyparameterstocontroltheroutedinterconnectcharacteristics.CoupledTLinemodelIdealtr

5、ansmissionlinemodelsCoupledTracesRightclickoverthetracenameoroneofitsvaluesintheParameterstaboftheSigXplorerspreadsheettodisplayandselecttheViewTraceParameterspopupmenu.YoucanviewtheRLGCmatrixofthecoupledtracemodel.RLGCMatrixofCoupledTraceModelsCrosstalkSimulationinSigXpl

6、orerYouderiveparallelismrulesfornetstoensurethatthefinaldesignisnotadverselyaffectedbycrosstalk-relatedproblemswhendevelopingtopologiesinSigXplorer.SimulatingwithCoupled-TraceModelsDevices=FastandSlowTerminatorsare+/-1ohmSweepSimulationResultswithCoupled-TraceModelsReceiv

7、eronVictimnet.HowCrosstalkisCalculatedinSigXplorerThefollowingfeaturesapplytocoupled-tracetopologies:Crosstalkiscalculatedusingclosedformanalysis.Thecrosstalkismeasuredonthevictimnetfromeachaggressornetinthecircuit.Thereportedcrosstalkistheresultofalltheaggressorcontribut

8、ions.Multipledriverscanbeactiveduringsimulation.ResultsarereportedinmV.Thereisamaximumofsixcoupl