5.44MACAddressHighBytesRegister(MACADDRHI)
5.45MACIndexRegister(MACINDEX)
EthernetMediaAccessController(EMAC)Registers
TheMACaddresshighbytesregister(MACADDRHI)isshowninFigure84anddescribedinTable83.
Figure84.MACAddressHighBytesRegister(MACADDRHI)
31242316
MACADDR2MACADDR3
R/W-0R/W-0
15870
MACADDR4MACADDR5
R/W-0R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Table83.MACAddressHighBytesRegister(MACADDRHI)FieldDescriptions
BitFieldValueDescription
31-24MACADDR20-FFhMACsourceaddressbits23-16(byte2)
23-16MACADDR30-FFhMACsourceaddressbits31-24(byte3)
15-8MACADDR40-FFhMACsourceaddressbits39-32(byte4)
7-0MACADDR50-FFhMACsourceaddressbits47-40(byte5).Bit40isthegroupbit.Itisforcedto0andreadas0.
Therefore,onlyunicastaddressesarerepresentedintheaddresstable.
TheMACindexregister(MACINDEX)isshowninFigure85anddescribedinTable84.
Figure85.MACIndexRegister(MACINDEX)
3116
Reserved
R-0
15320
ReservedMACINDEX
R-0R/W-0
LEGEND:R=Readonly;R/W=Read/Write;-n=valueafterreset
Table84.MACIndexRegister(MACINDEX)FieldDescriptions
BitFieldValueDescription
31-3Reserved0Reserved
2-0MACINDEX0-7hMACaddressindex.ThehostmustwritetheindexintotheRXADDRRAMintheMACINDEXfield,
followedbytheupper32-bitsofaddress,followedbythelower16-bitsofaddress(withcontrolbits).The
53-bitindexedRAMlocationiswrittenwhenthelowlocationiswritten.All32addressRAMlocations
mustbeinitializedpriortoenablingpacketreception.
SPRUEQ6–December2007EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)121
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