EthernetMediaAccessController(EMAC)Registers
Table68.MACControlRegister(MACCONTROL)FieldDescriptions(continued)
BitFieldValueDescription
5GMIIENGMIIenablebit.
0GMIIRXandTXareheldinreset.
1GMIIRXandTXareenabledforreceiveandtransmit.
4TXFLOWENTransmitflowcontrolenablebit.Thisbitdeterminesifincomingpauseframesareactedupon
infull-duplexmode.Incomingpauseframesarenotacteduponinhalf-duplexmode,
regardlessoftheTXFLOWENbitsetting.TheRXMBPENABLEbitsdeterminewhetherornot
receivedpauseframesaretransferredtomemory.
0Transmitflowcontrolisdisabled.Full-duplexmode:incomingpauseframesarenotacted
upon.
1Transmitflowcontrolisenabled.Full-duplexmode:incomingpauseframesareactedupon.
3RXBUFFERFLOWENReceivebufferflowcontrolenablebit.
0Receiveflowcontrolisdisabled.Half-duplexmode:noflowcontrolgeneratedcollisionsare
sent.Full-duplexmode:nooutgoingpauseframesaresent.
1Receiveflowcontrolisenabled.Half-duplexmode:collisionsareinitiatedwhenreceivebuffer
flowcontrolistriggered.Full-duplexmode:outgoingpauseframesaresentwhenreceiveflow
controlistriggered.
2Reserved0Reserved
1LOOPBACKLoopbackmode.Theloopbackmodeforcesinternalfull-duplexmoderegardlessofthe
FULLDUPLEXbitsetting.TheloopbackbitshouldbechangedonlywhenGMIIENbitis
deasserted.
0Loopbackmodeisdisabled.
1Loopbackmodeisenabled.
0FULLDUPLEXFull-duplexmode.Thegigabitmode(GIG=1)forcesfull-duplexmoderegardlessofthe
FULLDUPLEXbitsetting
0Half-duplexmodeisenabled.
1Full-duplexmodeisenabled.
SPRUEQ6–December2007EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)111
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