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DDR2LAYOUT规范(freescale的非常实用详尽)_AN2910FreescaleSemiconductorApplicationNoteDocumentNumber:AN2910Rev.2,03/2007HardwareandLayoutDesignConsiderationsforDDR2SDRAMMemoryInterfacesbyDSDApplicationsFreescaleSemiconductor,Inc.Austin,TXThedesignguidelinespresentedinthisdocumentapplytoproductsthatleveragetheDDR2SDRAMIPcore,andtheyarebasedonacompilationofinternalplatformsdesignedbyFreescaleSemiconductor,Inc.Thepurposeoftheseguidelinesistominimizeboard-relatedissuesacrossmultiplememorytopologieswhileallowingmaximumflexibilityfortheboarddesigner.BecausenumerousmemorytopologiesandinterfacefrequenciesarepossibleontheDDR2SDRAMinterface,Freescalehighlyrecommendsthatthesystem/boarddesignerverifyalldesignaspects(signalintegrity,electri……