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1、TN-00-20:UnderstandingtheValueofSITestingIntroductionTechnicalNoteUnderstandingtheValueofSignalIntegrityTestingIntroductionHistorically,designengineershaveusedsignalintegrity(SI)testingasakeypartofthedesignanddevelopmentofnewsystemsandforsustainingqualifications.
2、WhileSItestingisextremelyvaluableintheengineeringprototypephase,itisnotalwaystherighttool.Infact,itsvaluediminishesastheproductdesignprogresses.Afterdebugofearlyprototypesiscomplete,powerfultoolsthatperformtemperatureandvoltagemargintestingshouldsupplementorrepla
3、ceSItesting,especiallyforthequalificationofmemorydieshrinksandalternatesourcing.Theproperselectionofmemorydesign,test,andverificationtoolsreducesengineeringtimeandincreasestheprobabilityofdetectingpotentialproblems.Thistechnicalnotedescribeshowthesetoolscanbeused
4、tothebestadvantage,fromconceptionofanewproductthroughendoflife.ItalsoprovidesadetaileddescriptionofSI,itsuses,andlimitations.Finally,itpresentsanoverviewofmargintestingtoolsandthevaluetheycanadd.ToolsforMemoryDesign,Testing,andVerificationFiveessentialtoolsusedfo
5、rmemorydesignarelistedinTable1.However,thisisnotacompletelistbecauseitsfocusisonlyontoolsthatcanbeusedtovalidatethefunction-alityandrobustnessofadesign.Whenusedproperly,thesetoolsleadtoreduceddesigntimeandmorerobustsystems.Table1:MemoryDesign,Testing,andVerificat
6、ionToolsTools1ExamplesElectricalSimulationsSPICEorIBISBehavioralSimulationsVerilogorVHDLSignalIntegrityOscilloscopeandprobes;possiblymixedmodetoallowformoreaccuratesignalcaptureMarginTestingGuardbandtestingand4-cornertestingbyvariationofvoltageandtemperatureCompa
7、tibilityTestingFunctionalsoftwaretestingorsystemreboottestNotes:1.Thelogicanalyzerisnotincludedinthislist,althoughmostdebuglabsincludethistoolasanintegralpartoftheirdesignanddebugprocess.However,duetothecostandtimeinvolved,itisrarelythefirsttoolusedtodetectasyste
8、mfailureorproblem.Rather,itisusedtodebugaproblemdetectedbycompatibility,4-corner,orothertesting.PDF:09005aef8172701b/Source:09005aef81726ffcMicronTechnology,In
