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FPGA和DSP间基于SRIO的高速通信系统设计
Introduction
Field-ProgrammableGateArrays(FPGAs)andDigitalSignalProcessors(DSPs)aretwopopulartypesofdevicesusedindesigningdigitalcommunicationsystemsduetotheirhighflexibility,reprogrammability,andprocessingpower.FPGAisaprogrammablelogicdevicethatcanbeprogrammedtoperformawiderangeofdigitalfunctions,whileDSPisdesignedtoperformdigitalsignalprocessingoperationseffectively.Inthispaper,wepresentasystemdesignforhigh-speedcommunicationbetweenFPGAandDSPusingSerialRapidIO(SRIO)asthecommunicationprotocol.
Background
RapidIOisahigh-speedinterconnectprotocoldesignedforcommunicationbetweendifferentprocessortypes,suchasprocessors,DSPs,andFPGAs,thatarecommonlyusedindigitalcommunicationsystems.Itoffershighthroughputandlowlatencycommunicationbetweenprocessingelements.RapidIOcanoperateatspeedsupto40Gbps,whileSRIO,asubsetofRapidIO,supportspoint-to-pointcommunicationlinksatspeedsofupto20Gbps.
SystemDesign
ThesystemarchitectureconsistsofanFPGA-basedcommunicationmoduleandaDSP-basedsignalprocessingmodule.TheFPGAmoduleisusedtointerfacewiththeexternalworldthroughahigh-speedSRIOlink,whichprovidesfastcommunicationofdatabetweentheFPGAandDSPmodules.TheDSPmoduleperformsreal-timedigitalsignalprocessingontheincomingdataandreturnstheprocesseddatatotheFPGAmodulethroughtheSRIOlinkfortransmissiontotheexternalworld.
Thesystemoperatesinthefollowingmanner:theFPGAmodulereceivesdatafromanexternalsource,suchasasensorortransceiver.Theincomingdataispreprocessed,suchasfiltering,noisereduction,andcompressionbeforetransmissiontotheDSPmoduleforfurtherprocessing.TheDSPmoduleprocessesthedata,suchasmodulation,demodulation,datacompression,errorcorrection,orequalization,dependingontheapplication.TheprocesseddataisthenreturnedtotheFPGAmodulefortransmissiontotheexternalworld.TheFPGAalsocontrolsandmanagesthecommunicationbetweentheFPGAandDSPmodules.
FPGAModuleDesign
TheFPGAmoduleinterfaceswiththeexternalworldthroughahigh-speedserialinterface,suchasSRIO.ThemoduleincludesaSERDESmodule,whichdrivessign