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基于FPGA的PXIExpress接口设计.docx

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基于FPGA的PXIExpress接口设计 Introduction: PXIExpressisanadvancedmodularinstrumentationplatformthatprovideshigh-performance,flexiblemeasurementandcontrolsolutionsformoderntestandmeasurementapplications.PXIExpressisbasedonthePCIExpress(PCIe)technologyandprovidesfeatureslikehigh-speedserialdatatransfers,synchronization,triggering,andawidevarietyofmodularinstrumentationmodules.Inthispaper,wewilldiscussthedesignofaPXIExpressinterfacebasedonaFieldProgrammableGateArray(FPGA). PXIExpressInterfaceDesign: ThePXIExpressinterfacedesignrequiresahigh-speeddatatransferinterface,asynchronizationandtriggeringmechanismforreal-timedataacquisition,andamodulararchitectureforintegratingvariousmeasurementandcontrolmodules.FieldProgrammableGateArrays(FPGAs)offeraflexibleandcustomizableplatformthatcanbeprogrammedtoimplementtherequiredinterfacesandfunctionality.TheFPGAimplementationprovidesacost-effectivesolutionforthedesignofahigh-speedandconfigurabledatatransferinterface. ThePCIeinterfaceprotocolisusedasthehigh-speeddatatransferinterfaceforthePXIExpressinterfacedesign.ThePCIeprotocolsupportshigh-speedserialdatatransferswithdataratesofupto16Gbpsperlane.ThePCIeinterfaceprovidesascalableandflexibleinterfacethatcanbecustomizedtoimplementtherequireddatatransferinterface.ThePCIeinterfacearchitectureconsistsofarootcomplex,whichisthecentralcontroller,andanumberofendpointsthatareconnectedtotherootcomplexthroughthePCIeinterface.TheFPGAisusedtoimplementtheendpointinterfacetotherootcomplex. ThesynchronizationandtriggeringmechanisminthePXIExpressinterfaceisimplementedusingthePXItriggerbus.ThePXItriggerbusprovidesahardware-basedmechanismforsynchronizingmultiplemodulesinreal-time.ThePXItriggerbussupportsavarietyoftriggermodes,includingsoftwaretriggers,hardwaretriggers,andexternaltriggers.TheFPGAisusedtoimplementthePXItriggerbusinterfaceforsynchronizingandtriggeringthemeasurementandcontrolmodules. ThemodulararchitectureofthePXIExpressinterfaceisimplementedusingtheFPGAtechnology.Themodulararchitectureallowsforth