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5.20ReceiveMulticast/Broadcast/PromiscuousChannelEnableRegister(RXMBPENABLE)
EthernetMediaAccessController(EMAC)Registers
Thereceivemulticast/broadcast/promiscuouschannelenableregister(RXMBPENABLE)isshownin
Figure46anddescribedinTable45.
Figure46.ReceiveMulticast/Broadcast/PromiscuousChannelEnableRegister(RXMBPENABLE)
31302928272524
ReservedRXPASSCRCRXQOSENRXNOCHAINReservedRXCMFEN
R-0R/W-0R/W-0R/W-0R-0R/W-0
23222120191816
RXCSFENRXCEFENRXCAFENReservedRXPROMCH
R/W-0R/W-0R/W-0R-0R/W-0
1514131211108
ReservedRXBROADENReservedRXBROADCH
R-0R/W-0R-0R/W-0
7654320
ReservedRXMULTENReservedRXMULTCH
R-0R/W-0R-0R/W-0
LEGEND:R=Readonly;R/W=Read/Write;-n=valueafterreset
Table45.ReceiveMulticast/Broadcast/PromiscuousChannelEnableRegister(RXMBPENABLE)
FieldDescriptions
BitFieldValueDescription
31Reserved0Reserved
30RXPASSCRCPassreceiveCRCenablebit
0ReceivedCRCisdiscardedforallchannelsandisnotincludedinthebufferdescriptorpacket
lengthfield.
1ReceivedCRCistransferredtomemoryforallchannelsandisincludedinthebufferdescriptor
packetlength.
29RXQOSENReceivequalityofserviceenablebit
0ReceiveQOSisdisabled.
1ReceiveQOSisenabled.
28RXNOCHAINReceivenobufferchainingbit
0Receivedframescanspanmultiplebuffers.
1TheReceiveDMAcontrollertransferseachframeintoasinglebuffer,regardlessoftheframeor
buffersize.Allremainingframedataafterthefirstbufferisdiscarded.Thebufferdescriptorbuffer
lengthfieldwillcontaintheentireframebytecount(upto65535bytes).
27-25Reserved0Reserved
24RXCMFENReceivecopyMACcontrolframesenablebit.EnablesMACcontrolframestobetransferredto
memory.MACcontrolframesarenormallyactedupon(ifenabled),butnotcopiedtomemory.MAC
controlframesthatarepauseframeswillbeacteduponifenabledinMACCONTROL,regardlessof
thevalueofRXCMFEN.FramestransferredtomemoryduetoRXCMFENwillhavetheCONTROL
bitsetintheirEOPbufferdescriptor.
0MACcontrolframesarefiltered(butacteduponifenabled).
1MACcontrolframesaretransferredtomemory.
23RXCSFENReceivecopyshortframesenablebit.Enablesframesorfragmentsshorterthan64bytestobe
copiedtomemory.FramestransferredtomemoryduetoRXCSFENwillhavetheFRAGMENTor
UNDERSIZEbitsetintheirEOPbufferdescriptor.FragmentsareshortframesthatcontainCRC/
align/codeerrorsandundersizedareshortframeswithouterrors.
0Shortframesarefiltered.
1Shortframesaretransferredtomemory.
86EthernetMediaAccessController(EMAC)/SPRU941A–April2007
ManagementDataInput/Output(MDIO)
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