5.46TransmitChannel0-7DMAHeadDescriptorPointerRegister(TXnHDP)
5.47ReceiveChannel0-7DMAHeadDescriptorPointerRegister(RXnHDP)
EthernetMediaAccessController(EMAC)Registers
Thetransmitchannel0-7DMAheaddescriptorpointerregister(TXnHDP)isshowninFigure86and
describedinTable85.
Figure86.TransmitChannelnDMAHeadDescriptorPointerRegister(TXnHDP)
3116
TXnHDP
R/W-x
150
TXnHDP
R/W-x
LEGEND:R/W=Read/Write;-n=valueafterreset;-x=valueisindeterminateafterreset
Table85.TransmitChannelnDMAHeadDescriptorPointerRegister(TXnHDP)
FieldDescriptions
BitFieldValueDescription
31-0TXnHDP0-FFFFFFFFhTransmitchannelnDMAHeadDescriptorpointer.WritingatransmitDMAbufferdescriptor
addresstoaheadpointerlocationinitiatestransmitDMAoperationsinthequeueforthe
selectedchannel.Writingtotheselocationswhentheyarenonzeroisanerror(exceptatreset).
Hostsoftwaremustinitializetheselocationsto0onreset.
Thereceivechannel0-7DMAheaddescriptorpointerregister(RXnHDP)isshowninFigure87and
describedinTable86.
Figure87.ReceiveChannelnDMAHeadDescriptorPointerRegister(RXnHDP)
3116
RXnHDP
R/W-x
150
RXnHDP
R/W-x
LEGEND:R/W=Read/Write;-n=valueafterreset;-x=valueisindeterminateafterreset
Table86.ReceiveChannelnDMAHeadDescriptorPointerRegister(RXnHDP)
FieldDescriptions
BitFieldValueDescription
31-0RXnHDP0-FFFFFFFFhReceivechannelnDMAHeadDescriptorpointer.WritingareceiveDMAbufferdescriptor
addresstothislocationallowsreceiveDMAoperationsintheselectedchannelwhenachannel
frameisreceived.Writingtotheselocationswhentheyarenonzeroisanerror(exceptatreset).
Hostsoftwaremustinitializetheselocationsto0onreset.
122EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)SPRUEQ6–December2007
SubmitDocumentationFeedback
