5.43MACAddressLowBytesRegister(MACADDRLO)
EthernetMediaAccessController(EMAC)Registers
TheMACaddresslowbytesregisterusedinaddressmatching(MACADDRLO),isshowninFigure83
anddescribedinTable82.
Figure83.MACAddressLowBytesRegister(MACADDRLO)
312120191816
ReservedVALIDMATCHFILTCHANNEL
R-0R/W-xR/W-xR/W-x
15870
MACADDR0MACADDR1
R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset;-x=valueisindeterminateafterreset
Table82.MACAddressLowBytesRegister(MACADDRLO)FieldDescriptions
BitFieldValueDescription
31-21Reserved0Reserved
20VALIDAddressvalidbit.ThisbitshouldbeclearedtozeroforunusedaddressRAMlocations.
0Addresslocationisnotvalidandwillnotbeusedindeterminingwhetherornotanincomingpacket
matchesorisfiltered.
1Addresslocationisvalidandwillbeusedindeterminingwhetherornotanincomingpacket
matchesorisfiltered.
19MATCHFILTMatchorfilterbit
0Theaddresswillbeused(iftheVALIDbitisset)todetermineiftheincomingpacketaddress
shouldbefiltered.
1Theaddresswillbeused(iftheVALIDbitisset)todetermineiftheincomingpacketaddressisa
match.
18-16CHANNEL0-7hChannelbit.Determineswhichreceivechannelavalidaddressmatchwillbetransferredto.The
channelisadon'tcareiftheMATCHFILTbitisclearedto0.
15-8MACADDR00-FFhMACaddresslower8bits(byte0)
7-0MACADDR10-FFhMACaddressbits15-8(byte1)
120EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)SPRUEQ6–December2007
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