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应用于串行RapidIO的高速SerDes电路设计.docx

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应用于串行RapidIO的高速SerDes电路设计 Introduction Thedevelopmentofmodernelectroniccommunicationhaslargelybeendrivenbytheneedforhigh-speedandreliablecommunicationlinksthatcantransferdataatextremelyhighrates.Inhigh-speedcommunicationsystems,serialcommunicationlinkshavebecomeincreasinglypopularfortheirabilitytotransmitdataoverlongdistanceswithminimalpowerconsumptionandreducedsignalattenuation.Inthisregard,serialRapidIO,orSRIO,isaserialcommunicationprotocolthathasbeenspecificallydesignedforcommunicationsinhigh-performanceembeddedsystemssuchastelecommunicationsswitches,routers,andservers. SerDes(Serializer/Deserializer)circuitsarevitalcomponentsinmoderncommunicationsystems.Theyenabletheconversionofparalleldatatoserialdataandviceversa,allowingforhigh-speedcommunicationoverlongdistances.Inthispaper,wewilldiscussthedesignofhigh-speedSerDescircuitsforSRIOcommunicationsystems. SRIOArchitecture SRIOisaserialcommunicationprotocolthatenablesthecommunicationbetweendifferentprocessorsorcomponentsinembeddedsystems.TheSRIOarchitectureconsistsofaswitch,ahost,andanumberofendpoints.Inthisarchitecture,theswitchfunctionsasacentralhub,connectingalltheendpointsandthehost. Eachendpointisconnectedtotheswitchviaapoint-to-pointlink,enablinghigh-speedcommunicationbetweentheendpoints.Thehostisconnectedtotheswitchviaaseparatelink,allowingittomanagethecommunicationbetweentheendpointsandtocontroltheswitchingfunction. DesignConsiderationsforSRIOSerDesCircuits WhendesigningSerDescircuitsforSRIOcommunicationsystems,thereareseveralfactorsthatmustbetakenintoconsideration,includingthedatarate,jitter,powerconsumption,interconnectlength,andcrosstalk. Datarate ThedatarateisoneofthekeyfactorstoconsiderwhendesigningSerDescircuitsforSRIOcommunicationsystems.ThedatarateforSRIOcanrangefrom1.25Gbpsto6.25Gbps,dependingontheversionoftheprotocol.SerDescircuitsmust,therefore,bedesignedtosupportthesehighdatarates. Jitter Jitterisdefinedasthevariationinthetimeofaclockedgefromitsidealposition.Inhigh-speedcommunicationsystems,jitte