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7.14.4ManagementDataInput/Output(MDIO)
7.14.4.1MDIODevice-SpecificInformation
7.14.4.2MDIOPeripheralRegisterDescription(s)
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
TheManagementDataInput/Output(MDIO)moduleimplementsthe802.3serialmanagementinterfaceto
interrogateandcontrolsupto32EthernetPHY(s)connectedtothedevice,usingasharedtwo-wirebus.
ApplicationsoftwareusestheMDIOmoduletoconfiguretheauto-negotiationparametersofeachPHY
attachedtotheEMAC,retrievethenegotiationresults,andconfigurerequiredparametersintheEMAC
moduleforcorrectoperation.ThemoduleisdesignedtoallowalmosttransparentoperationoftheMDIO
interface,withverylittlemaintenancefromthecoreprocessor.
TheEMACcontrolmoduleisthemaininterfacebetweenthedevicecoreprocessor,theMDIOmodule,
andtheEMACmodule.TherelationshipbetweenthesethreecomponentsisshowninFigure7-58.
TheMDIOusesthesamepinsfortheMII,GMII,andRMIImodes.Standalonepinsareincludedforthe
RGMIImodeduetospecificvoltagerequirements.Onlyonemodecanbeusedatatime.Themodeused
isselectedatdeviceresetbasedontheMACSEL[1:0]configurationpins(formoredetailedinformation,
seeSection3,DeviceConfiguration).Table7-70aboveshowswhichmultiplexedpinareusedintheMII,
GMII,andRMIImodesontheMDIO.
FormoredetailedinformationontheEMAC/MDIO,seetheTMS320C645xDSPEMAC/MDIOModule
ReferenceGuide(literaturenumberSPRU975).
ClockingInformation
TheMDIOclockisbasedonadivide-downoftheSYSCLK3(fromthePLL1controller)andisspecifiedto
runupto2.5MHz,althoughtypicaloperationis1.0MHz.Sincetheperipheralclockfrequencyisvariable,
theapplicationsoftwareordrivercontrolsthedivide-downamount.
Table7-89.MDIORegisters
HEXADDRESSRANGEACRONYMREGISTERNAME
02C81800VERSIONMDIOVersionRegister
02C81804CONTROLMDIOControlRegister
02C81808ALIVEMDIOPHYAliveStatusRegister
02C8180CLINKMDIOPHYLinkStatusRegister
02C81810LINKINTRAWMDIOLinkStatusChangeInterrupt(Unmasked)Register
02C81814LINKINTMASKEDMDIOLinkStatusChangeInterrupt(Masked)Register
02C81818-02C8181C-Reserved
02C81820USERINTRAWMDIOUserCommandCompleteInterrupt(Unmasked)Register
02C81824USERINTMASKEDMDIOUserCommandCompleteInterrupt(Masked)Register
02C81828USERINTMASKSETMDIOUserCommandCompleteInterruptMaskSetRegister
02C8182CUSERINTMASKCLEARMDIOUserCommandCompleteInterruptMaskClearRegister
02C81830-02C8187C-Reserved
02C81880USERACCESS0MDIOUserAccessRegister0
02C81884USERPHYSEL0MDIOUserPHYSelectRegister0
02C81888USERACCESS1MDIOUserAccessRegister1
02C8188CUSERPHYSEL1MDIOUserPHYSelectRegister1
02C81890-02C81FFF-Reserved
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