PEX8517RDK中文资料元器件交易网www.cecb2b.com元器件交易网www.cecb2b.comVersion1.62007PEX8517FeaturesPEX8517GeneralFeatureso16-lanePCIExpressswitch-IntegratedSerDesoUptofiveconfigurableportso27mmx27mm,312-ballPBGApackageoTypicalPower:2.6WattsPEX8517KeyFeaturesoStandardsCompliant-PCIExpressBaseSpecification,r1.1-StandardSHPCSpecification,r1.1(hot-plug)oHighPerformance-Non-blockinginternalarchitecture-Fulllinerateonallports-Cut-Thrulatency:150nsoNon-TransparentBridging-ConfigurableNon-TransparentportforMulti-HostorIntelligentI/OSupportoFlexibleConfiguration-Fivehighlyflexible&configurableports(x1,x2,x4,orx8)-Configurablewithstrappingpins,EEPROM,I2C,orHostsoftware-LaneandpolarityreversaloPCIExpressPowerManagement-Linkpowermanagementstates:L0,L0s,L1,L2/L3Ready,L2andL3-Devicestates:D0andD3hotoQualityofService(QoS)-TwoVirtualChannelsperport-EightTrafficClassesperport-FixedandRound-RobinVirtualChannelPortArbitrationoReliability,Availability,Serviceability-4StandardHot-PlugControllers-Upstreamportashot-plugclient-TransactionLayerend-to-endCRC-Poisonbit-AdvancedErrorReporting-LaneStatusbitsandGPOavailable-Perporterrordiagnostics•BadDLLPs•BadTLPs•CRCerrors-JTAGboundaryscanFlexible&VersatilePCIExpress®SwitchMulti-purpose,FeatureRichExpressLane™PCIExpressSwitchTheExpressLanePEX8517deviceoffersPCIExpressswitchingcapabilityenablinguserstoaddscalablehighbandwidth,non-blockinginterconnectiontoawidevarietyofapplicationsincludingservers,storagesystems,communicationsplatforms,bladeservers,andembedded-controlproducts.ThePEX8517iswellsuitedforfan-out,aggregation,peer-topeer,andintelligentI/Omoduleapplications.HighlyFlexiblePortConfigurationsThePEX8517offershighlyconfigurableports.Thereareamaximumoffiveportsthatcanbeconfiguredtoanylegalwidthfromx1tox8,inanycombinationtosupportyourspecificbandwidthneeds.Theportscanbeconfiguredforsymmetric(eachporthavingthesamelanewidthandtrafficload)orasymmetric(portshavingdifferentlanewidths)traffic.Intheeventofasymmetrictraffic,thePEX8517featuresaflexiblecentralpacketmemorythatallocatesamemorybufferforeachportasrequiredbytheapplicationorendpoint.Thisbufferallocationalongwiththedevice'sflexiblepacketflowcontrolminimizesbottleneckswhentheupstreamandaggregateddownstreambandwidthsdonotmatch(areasymmetric).Anyoftheportscanbedesignatedastheupstreamport,whichcanbechangeddynamically.End-to-endPacketIntegrityThePEX8517providesend-to-endCRCprotection(ECRC)andPoisonbitsupporttoenabledesignsthatrequireguaranteederror-freepackets.ThesefeaturesareoptionalinthePCIExpressspecification,butPLXprovidesthemacrossitsentireExpressLaneswitchproductline.Non-Transparent“Bridging”inaPCIExpressSwitchThePEX8517supportsfullnon-transparentbridging(NTB)functionalitytoallowimplementationofmulti-hostsystemsandintelligentI/Omodulesinapplicationssuchascommunications,storage,andbladeservers.Toensurequickproductmigration,thenon-transparencyfeaturesareimplementedinthesamefashionasinstandardPCIapplications.Non-transparentbridgesallowsystemstoisolatememorydomainsbypresentingtheprocessorsubsystemasanendpoint,ratherthananothermemorysystem.Baseaddressregistersareusedtotranslateaddresses;doorbellregistersareusedtosendinterruptsbetweentheaddressdomains;andscratchpadregistersareaccessiblefrombothaddressdomainstoallowinter-processorcommunication.TwoVirtualChannelsTheExpressLanePEX8517switchsupportstwofull-featuredVirtualChannels(VCs)andeightTrafficClasses(TCs).ThemappingofTrafficClassestoport-specificVirtualChannelsallowsfordifferentmappingsfordifferentports.Inaddition,thedevicesofferuser-selectableVirtualChannelarbitrationalgorithmstoenableuserstofinetunetheQualityofService(QoS)requiredforaspecificapplication.元器件交易网www.cecb2b.comLowPowerwithGranularSerDesControlThePEX8517provideslowpowercapabilitythatisfullycompliantwiththePCIExpresspowermanagementspecification.Inaddition,theSerDesphysicallinkscanbeturnedoffwhenunusedforevenlowerpower.managementstates,incompliancewiththePCIExpresspowermanagementspecification.SerDesPowerandSignalManagementTheExpressLanePEX8517supportssoftwarecontroloftheSerDesoutputstoallowoptimizationofpowerandsignalstrengthinasystem.ThePLXSerDesimplementationsupportsfourlevelsofpower–off,low,typical,andhigh.TheSerDesblockalsosupportsloop-backmodesandadvancedreportingoferrorconditions,whichenablesefficientdebugandmanagementoftheentiresystem.FlexiblePortWidthConfigurationThelanewidthforeachportcanbeindividuallyconfiguredthroughauto-negotiation,hardwarestrapping,upstreamsoftwareconfiguration,orthroughanoptionalEEPROM.ThePEX8517supportsalargenumberofportconfigurations.Forexample,ifyouareusingthePEX8517inafan-outapplication,youmayconfiguretheupstreamportasx8andthedownstreamportsasfourx2ports;twox2&onex4ports;threex1ports;orothercombinations,aslongasyoudon’texceedthemaximumnumberoflanesand/orports.Inaportaggregationapplicationyoucanconfigurethreex2orx1portsforaggregationintoonex8orx4port.Figure1showsthemostcommonportconfigurations.FlexibleVirtualChannelArbitrationTheExpressLanePEX8517switchsupportshardwarefixedandRoundRobinarbitrationschemesfortwovirtualchannelsoneachport.ThisallowsforthefinetuningofQualityofServiceforefficientuseofpacketbuffersandsystembandwidth.ApplicationsSuitableforhost-centricaswellasintelligentI/OapplicationsExpressLanePEX8517canbeconfiguredforawidevarietyofformfactorsandapplications.Host-CentricFan-outTheExpressLanePEX8517switch,withitssymmetricorasymmetriclaneconfigurationcapability,allowsuserspecifictuningtoavarietyofhost-centricaswellaspeer-to-peerapplications.Figure1.CommonPortConfigurationsHot-PlugforHighAvailabilityHotplugcapabilityallowsuserstoreplacehardwaremodulesandperformmaintenancewithoutpoweringdownthesystem.ThePEX8517hot-plugcapabilityandAdvancedErrorReportingfeaturesmakesitsuitableforHighAvailability(HA)applications.FourportsincludeaStandardHot-PlugController.IfthePEX8517isusedinanapplicationwhereoneormoreofitsdownstreamportsconnecttoPCIExpressslots,eachport’sHot-PlugControllercanbeusedtomanagethehot-plugeventofitsassociatedslot.Furthermore,itsupstreamportisahot-plugclient,allowingittobeusedonhot-pluggableadaptercards,backplanes,andfabricmodules.Figure2.Fan-in/outUsageFigure2showsatypicalserver-baseddesign,wheretherootcomplexprovidesaPCIExpresslinkthatneedstobefannedintoalargernumberofsmallerportsforavarietyofI/Ofunctions,eachwithdifferentbandwidthrequirements.Inthisexample,thePEX8517wouldtypicallyhavean8-laneupstreamport,andasmanyasthreedownstreamports.Thedownstreamportscanbeofdifferingwidthsifrequired.ThefigurealsoshowshowsomeoftheportscanbebridgedtoprovidePCIorPCI-XslotsthroughtheuseoftheExpressLanePEX8114andPEX8111PCIebridgingdevices.FullyCompliantPowerManagementForapplicationsthatrequirepowermanagement,thePEX8517devicesupportsbothlink(L0,L0s,L1,L2/L3Ready,L2andL3)anddevice(D0andD3hot)powerAdapterCardAggregationThenumberandvarietyofPCIExpressnative-modedevicesisgrowingquickly.Asthesedevicesbecomemainstream,itwillbenecessarytocreatemultifunctionandmulti-port元器件交易网www.cecb2b.comadaptercardswithPCIExpresscapability.ThePEX8517canbeusedtocreateanadapterormezzaninecardthataggregatesthePCIExpressdevicesintoasingleportthatcanbepluggedintoabackplaneormotherboard.Figure3showsthePEX8517inthisapplication.DualHost/FabricModelTheExpressLanePEX8517supportsapplicationsrequiringdualhost,hostfailover,andload-sharingapplicationsthroughthenon-transparencyfeature.Figure5illustratesadualhostsystemwithdualswitchfabricindual-starconfiguration.TheredundancyofthehostandthefabriccanbeachievedthroughmanypossibleconfigurationsusingtheNonTransparentBridge(NTB)functionofPEX8517.Intheconfigurationshownbelow,Host1controlsSwitch1anditsassociatedI/OswhileHost2controlsSwitch2anditsassociatedI/Os.ThehostsandswitchesareisolatedusingNTBfunctionalityofPEX8517onthehostboards.IfoneofthehostsfailsthesurvivinghostcanremovethefailinghostfromtheconfigurationandgaincontrolofbothswitchesandallI/Os.Similarly,ifoneoftheswitchesfailsthehostassociatedwiththatswitchcansendcontrolmessagestoitsI/OsthroughthesurvivingswitchthroughtheNTBfunction.Figure3.AggregationAdapterCardTheadaptercardinFigure3canbetransparent,inwhichcasethePCIExpressI/OdevicesarejuststandardI/OendpointssuchasEthernetorFibreChannel.Alternatively,thePEX8517canprovideanon-transparentporttothesystem(viathecard’sedgeconnector).Inthiscase,oneofthePCIExpressdevicescanbeaCPUorother“intelligent”devicewithon-chipprocessingcapability–thusneedingaddressdomainisolationfromtherestofthesystem.ThisapproachiscommonlyusedinRAIDcontrollers.IntelligentAdapterCardThePEX8517supportsthenon-transparencyfeature.Figure4illustratesahostsystemusinganintelligentadaptercard.Figure5.DualHost/FabricModeEmbeddedSystemsThePEX8517canalsobeutilizedinembeddedapplications.Figure6showsseveralindependentmodulesconnectingthroughthePEX8517.Theportwidthsforeachmodulecanbeconfiguredasrequired.ThePeer-to-peercommunicationfeatureofthePEX8517allowsthesemodulestocommunicatewitheachotherwithoutanycentralizedcontrol.Figure4.IntelligentAdapterUsageInthisfigure,theCPUontheadaptercardisisolatedfromthehostCPU.ThePEX8517non-transparentportallowsthetwoCPUstobeisolatedbutcommunicatewitheachotherthroughvariousregistersthataredesignedinthePEX8517forthatpurpose.ThehostCPUcandynamicallyre-assignboththeupstreamportandthenon-transparentportofPEX8517allowingthesystemtobereconfigured.Figure6.EmbeddedSystems元器件交易网www.cecb2b.comSoftwareUsageModelFromasystemmodelviewpoint,eachPCIExpressportisavirtualPCItoPCIbridgedeviceandhasitsownsetofPCIExpressconfigurationregisters.ItisthroughtheupstreamportthattheBIOSorhostcanconfiguretheotherportsusingstandardPCIenumeration.ThevirtualPCItoPCIbridgeswithinthePEX8517arecomplianttothePCIandPCIExpresssystemmodels.TheConfigurationSpaceRegisters(CSRs)inavirtualprimary/secondaryPCItoPCIbridgeareaccessiblebytype0configurationcyclesthroughthevirtualprimarybusinterface(matchingbusnumber,devicenumber,andfunctionnumber).InterruptSources/EventsThePEX8517supportstheINTxinterruptmessagetype(compatiblewithPCI2.3Interruptsignals)orMessageSignaledInterrupts(MSI)whenenabled.Interrupts/messagesaregeneratedbyPEX8517forhot-plugevents,doorbellinterrupts,baselineerrorreporting,andadvancederrorreporting.DevelopmentToolsPLXoffershardwareandsoftwaretoolstoenablerapidcustomerdesignactivity.Thesetoolsconsistofahardwaremodule(PEX8517RDK),hardwaredocumentation,andaSoftwareDevelopmentKit(SDK).PORT1-X4LaneStatusLEDsRDKTheRDKhardwaremoduleincludesthePEX8517withonex4(card-edgeslot)portandthreeadditionalx4ports(seeFigure7).TheRDKisavailablewithx4cardedgeconnectorandadaptersforx1edgeconnectorsareavailabletoplugtheRDKintosmallerslots.ThePEX8517RDKhardwaremodulecanbeinstalledinamotherboard,usedasarisercard,orconfiguredasabench-topboard.ThePEX8517RDKcanbeusedtotestandvalidatecustomersoftware.Additionally,itcanbeusedasanevaluationvehicleforPEX8517featuresandbenefits.PORT2-X4HDPowerConnectorPORT3-X2ManualResetPORT4-X2HotPlugCkt.JTAGHeaderV1otV21osInoNretrevnoCDIPswitchforcfg.SDKTheSDKtoolsetincludes:-Linux&Windowsdrivers-C/C++Sourcecode,Objects,libraries-User’sGuides&ApplicationexamplesWindows/LinuxAppsUserSpacePEX8518PEX851885178518RefClkResetCkt.PERST#(UpstreamPort)x4PEXI2CPEXAPIKernelSpacePCIeDriverNTPnPDriverEEPROMFigure7.PEX8517RDKHardwarePCIExpressInterfaceProductOrderingInformationPLXTechnology,Inc.870W.MaudeAve.Sunnyvale,CA94085USATel:1-800-759-3735Tel:1-408-774-9060Fax:1-408-774-2169Email:info@plxtech.comWeb:www.plxtech.comPartNumberPEX8517-AC25BIPEX8517-AC25BIGPEX8517RDKDescription16Lane,5PortPCIeSwitch,312-ballPBGA27x27mmpkg16Lane,5PortPCIeSwitch,312-ballPBGA27x27mmpkg,Pb-freePEX8517RapidDevelopmentKitwithx4ConnectorPleasevisitthePLXWebsiteat©2006PLXTechnology,Inc.Allrightsreserved.PLXandthePLXlogoareregisteredtrademarksofPLXTechnology,Inc.ExpressLaneisatrademarkofPLXTechnology,Inc.,whichmayberegisteredinsomejurisdiction.Allotherproductnamesthatappearinthismaterialareforidentificationpurposesonlyandareacknowledgedtobetrademarksorregisteredtrademarksoftheirrespectivecompanies.InformationsuppliedbyPLXisbelievedtobeaccurateandreliable,butPLXTechnology,Inc.assumesnoresponsibilityforanyerrorsthatmayappearinthismaterial.PLXTechnology,Inc.reservestheright,withoutnotice,tomakechangesinproductdesignorspecification.PEX8517-SIL-PB-1.605/07
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