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1Introduction
1.1PurposeofthePeripheral
1.2Features
User'sGuide
SPRU975B–August2006
EthernetMediaAccessController(EMAC)/Management
DataInput/Output(MDIO)
ThisdocumentprovidesafunctionaldescriptionoftheEthernetMediaAccessController(EMAC)and
Physicallayer(PHY)deviceManagementDataInput/Output(MDIO)moduleintegratedwith
TMS320C645x(C645x)devices.IncludedarethefeaturesoftheEMACandMDIOmodules,adiscussion
oftheirarchitectureandoperation,howthesemodulesconnecttotheoutsideworld,andtheregisters
descriptionforeachmodule.
TheEMACcontrolstheflowofpacketdatafromtheprocessortothePHY.TheMDIOmodulecontrols
PHYconfigurationandstatusmonitoring.
BoththeEMACandtheMDIOmodulesinterfacetotheDSPthroughacustominterfacethatallows
efficientdatatransmissionandreception.ThiscustominterfaceisreferredtoastheEMACcontrol
module,andisconsideredintegraltotheEMAC/MDIOperipheral.
TheEMACmoduleisusedonTMS320C645xdevicestomovedatabetweenthedeviceandanotherhost
connectedtothesamenetwork,incompliancewiththeEthernetprotocol.
ThebasicfeaturesetoftheEMACmoduleintegratedwithC645xis:
•Synchronous10/100/1000Mbpsoperation
•FullduplexGigabitoperation(halfduplexgigabitisnotsupported)
•Littleendianandbigendiansupport
•Supportsfourtypesofinterfacestothephysicallayerdevice(PHY):standardmediaindependent
interface(MII),reducedpincountmediaindependentinterface(RMII),standardgigabitmedia
independentinterface(GMII)andreducedpincountgigabitmediaindependentinterface(RGMII)
•EMACactsasDMAmastertoeitherinternalorexternaldevicememoryspace
•EightreceivechannelswithVLANtagdiscriminationforreceivequalityofservice(QOS)support
•Eighttransmitchannelswithround–robinorfixedpriorityfortransmitqualityofservice(QOS)support
•Ether-statsand802.3-statsstatisticsgathering
•TransmitCRCgenerationselectableonaper-channelbasis
•Broadcastframesselectionforreceptiononasinglechannel
•Multicastframesselectionforreceptiononasinglechannel
•Promiscuousreceivemodeframesselectionforreceptiononasinglechannel(allframes,allgood
frames,shortframes,errorframes)
•Hardwareflowcontrol
•8KbytelocalEMACdescriptormemorythatallowstheperipheraltooperateondescriptorswithout
affectingtheCPU.Thedescriptormemoryholdsenoughinformationtotransferupto512ethernet
packetswithoutCPUintervention.
•Programmableinterruptlogicpermitsthesoftwaredrivertorestrictthegenerationofback-to-back
interrupts,thusallowingmoreworktobeperformedinasinglecalltotheinterruptserviceroutine
SPRU975B–August2006EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)11
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