2022年GMII接口定义 .pdf

DaveFifield1-408-721-GMIIElectricalSpecificationIEEEInterimMeeting,SanDiego,January1997N名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 14 页 -NGMIIElectricalSpecificationPage2IEEEP802.3zInterim,January1997GMIIElectricalSpecification-GoalssCompatibilitywithANSITR/X3.18-199xRevision2.3FibreChannel-10-bitInterfacespecificationsCompatibilitywithIEEE802.3uClause22.4MIIElectricalCharacteristicssManufacturable/Implementableusingcurrenttechnology名师资料总结-精品资料欢迎下载-名师精心整理-第 2 页，共 14 页 -NGMIIElectricalSpecificationPage3IEEEP802.3zInterim,January1997WhyCompatibilityWith10bandMII?名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 14 页 -NGMIIElectricalSpecificationPage4IEEEP802.3zInterim,January19971000BASE-XImplementationsMACRECONCILIATIONPCSPMAPMDMACRECONCILIATIONLOGICALGMIICLAUSE36PCSGMII*PCS/PMAinterfacemustbe10bcompatiblesocurrentSerDesdevicescanbeusedSERDESCLAUSE38FIBEROPTICTRANSCEIVER10bI/FCLAUSE39PMDI/FLANCSMA/CDLAYERSDEVICEPARTITIONING名师资料总结-精品资料欢迎下载-名师精心整理-第 4 页，共 14 页 -NGMIIElectricalSpecificationPage5IEEEP802.3zInterim,January19971000BASE-TImplementationsMACRECONCILIATIONPCSPMAPMDMACRECONCILIATIONGMIICLAUSE40PCS/PMA/PMD1000BASE-TPHYGMII*GMIIElectricalSpecificationisrequiredtoensurevendorinteroperability*Sensibletomakeitcompatiblewith10bElectricalSpecificationsoMACdevicecanbethesameoneusedfor1000BASE-X(butwiththe8b/10bPCSbypassed)LANCSMA/CDLAYERSDEVICEPARTITIONING名师资料总结-精品资料欢迎下载-名师精心整理-第 5 页，共 14 页 -NGMIIElectricalSpecificationPage6IEEEP802.3zInterim,January1997Mixed10/100/1000BASE-TImplementaionsMACRECONCILIATION10/100/1000Mb/sPHY10/100/1000Mb/sMACRECONCILIATIONGMII/MIICLAUSE40PCS/PMA/PMD1000BASE-TPHYGMII/MII*Multi-speedMACsarelikelytobeimplemented*Thisrequirescompatibilitywiththeexisting10/100MIIelectricalspecificationLANCSMA/CDLAYERSDEVICEPARTITIONING10BASE-TAND/OR100BASE-TPHY(AGMIIwithanMIIstubisnotrecommended)名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 14 页 -NGMIIElectricalSpecificationPage7IEEEP802.3zInterim,January199710bElectricalSpecificationssTTL/CMOSinputandoutputcompatiblesToleranceformismatchedinputlevelsisoptionalqEg.a5Voutputdrivinga3.3VinputqDevicesthatmeetthisspecificationbutarenottolerantofmismatchedinputlevelsarestillregardedascompliantSource-ANSITR/X3.18-199xRevision2.3FibreChannel-10-bitInterfaceSpecification名师资料总结-精品资料欢迎下载-名师精心整理-第 7 页，共 14 页 -NGMIIElectricalSpecificationPage8IEEEP802.3zInterim,January1997MIIElectricalSpecificationssTTL/CMOSinputandoutputcompatiblesMIIreceiversrequiredtobetolerantofallinputpotentialsfrom0Vto+5.5Vand(15ns)transientsfrom-1.8Vto+7.3VqMorestringentthanthe10bspecificationSymbolParameterConditionsMinTypMaxUnitsVOHVOLVIHVILIIHIILCinOutputHighVoltageOutputLowVoltageInputHighVoltageInputLowVoltageInputHighCurrentInputLowCurrentInputCapacitanceIOH=-4mAIOL=4mA2.4V0.4V2.00.8VVVi=5.25V200uAVi=0.00V-20uA8pFdtMIICableDelayVariation(Skew)0.1nSSource-IEEE802.3uClause22.4,MIIElectricalCharacteristics名师资料总结-精品资料欢迎下载-名师精心整理-第 8 页，共 14 页 -NGMIIElectricalSpecificationPage9IEEEP802.3zInterim,January1997CombiningtheElectricalSpecificationssNotpracticaltoforcethehighercurrentMIIdrivespecificationsonexistingSerDesdevicesqGMIIspecifiesnoconnectororcable-10bdrivelevelsaresufficientsWithavoluntaryrestriction(recommendation?)touseGMIIinMIImodeonlyovershort,matched,PCBtraces,the10bspecificationwillprovideadequatecompatibilitywithexisting10/100Mb/sPHYdevicesqThisrestrictioncannotbestandardized(define“short”!?)qCouldaddanoteinClause42SystemConsiderations名师资料总结-精品资料欢迎下载-名师精心整理-第 9 页，共 14 页 -NGMIIElectricalSpecificationPage10IEEEP802.3zInterim,January199710b/MIICompatibilitysSincethetransmissionlineisveryshort,itcanbetreatedasasalumpedcapacitanceoutputloadsTotalloadonthe10bdriver=12.5pFmax,6.5pFtypsAll10bACspecificationsarespecifiedwithanoutputloadof10pFsRanoutoftimetodothemath,sorry!sAlltheindicationsarethatthisshouldwork10bDRIVERMIIRECEIVERCin=8.0pFmax(2.0pFtyp)GROUND3InchesofPCBTrace1.5pFperInch=4.5pF名师资料总结-精品资料欢迎下载-名师精心整理-第 10 页，共 14 页 -NGMIIElectricalSpecificationPage11IEEEP802.3zInterim,January1997Hookingupa1000BASE-XPHY1Gb/sNICDEVICESTATIONMANAGEMENTCLAUSE36PCS1Gb/sMACMACCONTROL(OPTIONAL)RECONCILIATION(TXD)(GTX_CLK)SERDESDEVICE(PMA)(TX_EN:TX_ER)TX0:7TX8:9TBCGMI I(RXD)(RX_DV:RX_ER)RX0:7RX8:9RBC0:1RBC0:1COM_DETCOM_DETMDCMDIOPHYType?EWRAP-LCK_REFREFCLKEN_CDETFIBERPMD名师资料总结-精品资料欢迎下载-名师精心整理-第 11 页，共 14 页 -NGMIIElectricalSpecificationPage12IEEEP802.3zInterim,January1997HookinguptheGMII-1000BASE-TCLAUSE36PCS-BYPASSEDTXDTX_ENTX_ERGTX_CLK(125MHz)TX_CLKCOLRXDRX_ERRX_CLK(125MHz)CRSRX_DVMDCMDIOCLAUSE40PCS/PMA/PMD1000BASE-TPHYHybridTransformerThingy“RJ45”1Gb/sNICDEVICESTATIONMANAGEMENT1Gb/sMACMACCONTROL(OPTIONAL)RECONCIL IATIONGMII名师资料总结-精品资料欢迎下载-名师精心整理-第 12 页，共 14 页 -NGMIIElectricalSpecificationPage13IEEEP802.3zInterim,January1997HookinguptheGMII-10/100BASE-TCLAUSE36PCS-BYPASSEDTXDTX_ENTX_ERGTX_CLKTX_CLKCOLRXDRX_ERRX_CLKCRSRX_DVMDCMDIO10/100BASE-TPHYMagnetics“RJ45”10/100/1000Mb/sNICDEVICESTATIONMANAGEMENT1Gb/sMACMACCONTROL(OPTIONAL)RECONCILIATIONGMIIinMIIModeTXDRXD名师资料总结-精品资料欢迎下载-名师精心整理-第 13 页，共 14 页 -NGMIIElectricalSpecificationPage14IEEEP802.3zInterim,January1997GMII-WorktodosCompletemathtoprove10b/MIIcompatibilitysUsingAsifIqbalsworkontimingasabasis,writeClause35.3SignalTimingCharacteristicsqIncludeworstcasepermissibledelay,skewandcapacitanceoftheGMIItransmissionmedium(PCBtracespecifications)sUsing10bspecificationasabasis(asitalreadyisinDraftD1),editClause35.4ElectricalCharacteristicsqSignalterminationqDCspecificationssSpeedselectionandFiberPHYtypeselectionmethodqSelectorpinsonGMII?名师资料总结-精品资料欢迎下载-名师精心整理-第 14 页，共 14 页 -