Design Guidelines for implementing LVDS Interfaces

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1、AN479:DesignGuidelinesforImplementingLVDSInterfacesinCycloneSeriesDevices©June2009AN-479-1.1IntroductionThisapplicationnotedescribesthemethodstouseCyclone®series(CycloneIII,CycloneIIILS,CycloneII,andCyclone)devicesforhigh-performanceLVDSinterfaces.LVDSisasignalingstandardthatprovideshigh-speeddatatr

2、ansfers.CycloneseriesdevicesoffereasyintegrationofLVDSinterfacesatspeedsupto875Mbpsforthereceiverand840Mbpsforthetransmitter.Thisapplicationnotealsoincludesstep-by-stepdesignflowandinterfaceguidelines.WithsimplesettingsandconsiderationsusingtheALTLVDSmegafunctionintheQuartus®IIsoftware,Cycloneseries

3、devicesbecomepartofthehigh-speedsetupinyoursystem,withincreasedsystemintegrationatreducedcost.Usethisapplicationnotewiththefollowingchaptersfromtherespectivedevicefamilyhandbooks:■High-SpeedDifferentialInterfacesinCycloneIIIDeviceschapterinvolume1oftheCycloneIIIDeviceHandbook■High-SpeedDifferentialI

4、nterfacesinCycloneIIDeviceschapterinvolume1oftheCycloneIIDeviceHandbook■High-SpeedDifferentialSignalinginCycloneDeviceschapterinvolume1oftheCycloneDeviceHandbookFPGADesignFlowThissectiondescribesthedesignflowtoimplementanLVDSinterfaceinaCycloneseriesdeviceusingtheALTLVDSmegafunctionasshowninFigure1.

5、Thefollowingsubsectionsdetailthestep-by-stepdesignflowandsimpleguidelinestointegrateanLVDSinterfaceblocktoaCycloneseriesdevice.©June2009AlteraCorporationAN479:DesignGuidelinesforImplementingLVDSInterfacesinCycloneSeriesDevicesPage2FPGADesignFlowFigure1.DesignFlowforImplementingLVDSInterfacesinCyclon

6、eSeriesDevicesDefineInterfaceSpecificationSelectDeviceCreateaQuartusIIProjectInstantiateLVDSInterfacePerformOptionalAddConstraintsRTL/FunctionalSimulationCompileDesignYesPerformGate-OptionalIsTimingNoAdjustConstraintsLevelSimulation.ClosurePassed?Verified?YesDetermineBoardDesignConstraintsPerformBoa

7、rdLevelSimulationIsEyeNoAdjusttracelengthDiagramorprogrammableVerified?pre-emphasissettingYesVerifyFPGAFunctionalityIstheNoDesignDebugDesignWorking?YesDesignDoneAN479:DesignGuidelinesforImplementingLV