SFF_8431简介与SFI电气参数测试.ppt

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1、SFF-8431簡介及SFI電氣參數測試AgendaIntroductionofSFF-8431SFF-8431StandardComplianceTestofSFIEyeDiagramTestbyDSA8200IntroductionofSFF-8431BRIEFINTRODUCTIONOFSFF-8431ThespecificationofSFF-8431definestheelectricalinterfacesandtheirtestmethodsbetweentheSFP+moduleandhostboardforoperation

2、upto11.1GBd.ThehighspeedelectricalinterfacebetweenthehostandSFP+moduleiscalled“SFI”.SFIsimplifiesthemoduleandleverageshostbasedtransmitpre-emphasisandhostbasedreceiveequalizationtoovercomePCBandexternalmediaimpairments.SFItypicallyoperateswithoneconnectoratthemoduleinterfac

3、eanduptoabout200mmofimprovedFR4materialor150mmofstandardFR4.Theelectricalinterfaceisbasedonhighspeed,lowvoltageACcoupledlogicwithanominaldifferentialimpedanceof100Ω.TheSFP+specificationsincludesmanagement,lowspeedsignal,highspeedsignal,connector(definedbySFF-8083),mechanica

4、l(definedbySFF-8432),andappendicesprovidingparameterandtestboarddefinitions,andimplementationandmeasurementdescriptions.IntroductionofSFF-8431TheSFP+SUPPORTEDSTANDARDSIntroductionofSFF-8431POWERSPECIFICATIONSOFSFP+ThemodulesignalgroundcontactsVeeRandVeeTshouldbeisolatedfrom

5、modulecase.AthostpowerupthehostshallsupplyVccTandVccRtothemodulewithin100msofeachother.SFP+lowspeedsignalingisbasedonLowVoltageTTL(LVTTL)operatingwithamodulesupplyof3.3V+/-5%andwithahostsupplyrangeof2.38to3.46V.Toavoidexceedingsystempowersupplylimitsandcoolingcapacity,allmo

6、dulesatpowerupbydefaultshalloperatewith≤1.0W.HostssupportingPowerLevelIIoperationmayenableaPowerLevelIImodulethroughthe2-wireinterface.PowerLevelIImodulesshallassertthepowerleveldeclarationbitofSFF-8472..Overlongspanssuchasthe40kmEthernetextendedreach(ER)longwavelengthappli

7、cations,theSFP+transceiversmayrequireadditionalpowerconsumption,especiallyatextremeoperatingconditions.•PowerLevelImodules–Upto1.0W•PowerLevelIImodules–Upto1.5WGENERALREQUIREMENTSIntroductionofSFF-8431Themaximumpowerlevelisallowedtoexceedtheclassifiedpowerlevelfor500msfollo

8、winghotinsertionorpowerup,orPowerLevelIIauthorization,howeverthecurrentislimitedto