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1、FirstExperiencewiththeScalableCoherentInterfaceH.MullerECPDivision,CERN,CH1211Geneva23SwitzerlandandA.Bogaerts1、J.Buytaert1，R.Divia[A.Ivanov2,R.Keyser1,F.Lozano-Alemany2.IHEPProtvino,Russia,GMugnai1,D.Samyn1,B.SkaaliUniversityofOSLO,PhysicsDepartment,NorwayRD24Collaboration,CERN,C
2、H1211Geneva23,SwitzerlandAbstractTheresearchprojectRD24[11]isstudyingapplicationsoftheScalableCoherentInterface(IEEE-1596)standardforthelargehadroncollider(LHC).FirstSCInodechipsfromDolphinwereusedtodemonstratetheuseandfunctioningofSCFspacketprotocolsandtomeasuredatarates.Wepresen
3、tresultsfromafirst,two-nodeSCIringletatCERN,basedonaR3000RISCprocessornodeandDMAnodeonaMC68040processorbus.AdiagnosticlinkanalyzermonitorstheSCIpacketprotocolsuptofulllinkbandwidth.Initssecondphase,RD24willbuildafirstimplementationofamulti-ringletSCIdatamerge匚I.BASICSofSCI1.CERN,G
4、enevaSwitzerland3.UniversidadPolitecnicadeMadrid,SpainSCI[1]providesbuslikefeaturesbetweenSCInodesinaringlet.Point-to-pointlinksinterconnecttheinputsandoutputsofSCInodes(fig1).Thesetransmitincomingpacketseithertotheoutputlink,ordirectthemintoaninputFIFO.Packetswhicharegeneratedbyu
5、ser-logicontheCbus[2]sidearequeuedinanoutputFIFOuntilthebypassFIFOisempty.Inthisway,severalnodesinaringletmaybereceivingandtransmittingsimultaneouslyattheintrinsicnode-chipspeedtoachievearingletbandwidthwhichissignificantlyhigherthanthenodechipbandwidthSCIlinkstransportpacketsassh
6、ownschematicallyinfig2.Aflagsignaldelimitspacketswhicharecomposedofdataorcontrolsymbols,clockedateverytransitionoftheSCIclock.The16bitwidelinkofaGaASNodeChip™[3]fromDolphintransmitsone16bitsymbolevery2ns,resultinginarawlinkbandwidthof1Gbyte/s.SCIpacketsareframedbyaheader,containin
7、gaddressandcommandfields,andaCRCtraile匚Transactionsconsistoftwosubactions:duringtherequestsubactionapacketcontainingaddress,commandandoptionallydataissenttoarespondernode.Afterit'sintrinsiclatency,theresponderstartstheresponsesubaction,whichincaseofareadtransactionreturnsdataviaar
8、esponsepacket.Typicaltransactions
