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5.44MACIndexRegister(MACINDEX)
EthernetMediaAccessController(EMAC)Registers
TheMACindexregister(MACINDEX)isshowninFigure70anddescribedinTable69.
Figure70.MACIndexRegister(MACINDEX)
3116
Reserved
R-0
15320
ReservedMACINDEX
R-0R/W-0
LEGEND:R=Readonly;R/W=Read/Write;-n=valueafterreset
Table69.MACIndexRegister(MACINDEX)FieldDescriptions
BitFieldValueDescription
31-3Reserved0Reserved
2-0MACINDEX0-7hMACaddressindex.Alleightaddressessharetheupper40bits.Onlythelowerbyteisuniqueforeach
address.Anaddressiswrittenbyfirstwritingtheaddressnumber(channel)intotheMACINDEX
register.Theupper32bitsoftheaddressarethenwrittentotheMACADDRHIregister,whichis
followedbywritingthelower16bitsoftheaddresstotheMACADDRLOregister.Sincealleight
addressessharetheupper40bitsoftheaddress,theMACADDRHIregisteronlyneedstobewritten
thefirsttime.
SPRU941A–April2007EthernetMediaAccessController(EMAC)/105
ManagementDataInput/Output(MDIO)
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