5.45TransmitChannel0-7DMAHeadDescriptorPointerRegister(TXnHDP)
5.46ReceiveChannel0-7DMAHeadDescriptorPointerRegister(RXnHDP)
EthernetMediaAccessController(EMAC)Registers
Thetransmitchannel0-7DMAheaddescriptorpointerregister(TXnHDP)isshowninFigure71and
describedinTable70.
Figure71.TransmitChannelnDMAHeadDescriptorPointerRegister(TXnHDP)
3116
TXnHDP
R/W-x
150
TXnHDP
R/W-x
LEGEND:R/W=Read/Write;-n=valueafterreset;-x=valueisindeterminateafterreset
Table70.TransmitChannelnDMAHeadDescriptorPointerRegister(TXnHDP)
FieldDescriptions
BitFieldValueDescription
31-0TXnHDP0-FFFFFFFFhTransmitchannelnDMAHeadDescriptorpointer.WritingatransmitDMAbufferdescriptor
addresstoaheadpointerlocationinitiatestransmitDMAoperationsinthequeueforthe
selectedchannel.Writingtotheselocationswhentheyarenonzeroisanerror(exceptatreset).
Hostsoftwaremustinitializetheselocationsto0onreset.
Thereceivechannel0-7DMAheaddescriptorpointerregister(RXnHDP)isshowninFigure72and
describedinTable71.
Figure72.ReceiveChannelnDMAHeadDescriptorPointerRegister(RXnHDP)
3116
RXnHDP
R/W-x
150
RXnHDP
R/W-x
LEGEND:R/W=Read/Write;-n=valueafterreset;-x=valueisindeterminateafterreset
Table71.ReceiveChannelnDMAHeadDescriptorPointerRegister(RXnHDP)
FieldDescriptions
BitFieldValueDescription
31-0RXnHDP0-FFFFFFFFhReceivechannelnDMAHeadDescriptorpointer.WritingareceiveDMAbufferdescriptor
addresstothislocationallowsreceiveDMAoperationsintheselectedchannelwhenachannel
frameisreceived.Writingtotheselocationswhentheyarenonzeroisanerror(exceptatreset).
Hostsoftwaremustinitializetheselocationsto0onreset.
106EthernetMediaAccessController(EMAC)/SPRU941A–April2007
ManagementDataInput/Output(MDIO)
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