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4.3PHYAcknowledgeStatusRegister(ALIVE)
4.4PHYLinkStatusRegister(LINK)
MDIORegisters
ThePHYacknowledgestatusregister(ALIVE)isshowninFigure15anddescribedinTable13.
Figure15.PHYAcknowledgeStatusRegister(ALIVE)
3116
ALIVE
R/WC-0
150
ALIVE
R/WC-0
LEGEND:R/W=Read/Write;WC=Write1toclear;-n=valueafterreset
Table13.PHYAcknowledgeStatusRegister(ALIVE)FieldDescriptions
BitFieldValueDescription
31-0ALIVEMDIOAlivebits.Eachofthe32bitsofthisregisterissetifthemostrecentaccesstothePHYwith
addresscorrespondingtotheregisterbitnumberwasacknowledgedbythePHY;thebitisresetifthe
PHYfailstoacknowledgetheaccess.BoththeuserandpollingaccessestoaPHYwillcausethe
correspondingalivebittobeupdated.Thealivebitsareonlymeanttobeusedtogiveanindicationofthe
presenceornotofaPHYwiththecorrespondingaddress.Writinga1toanybitwillclearit,writinga0
hasnoeffect.
0ThePHYfailstoacknowledgetheaccess.
1ThemostrecentaccesstothePHYwithanaddresscorrespondingtotheregisterbitnumberwas
acknowledgedbythePHY.
ThePHYlinkstatusregister(LINK)isshowninFigure16anddescribedinTable14.
Figure16.PHYLinkStatusRegister(LINK)
3116
LINK
R-0
150
LINK
R-0
LEGEND:R=Readonly;-n=valueafterreset
Table14.PHYLinkStatusRegister(LINK)FieldDescriptions
BitFieldValueDescription
31-0LINKMDIOLinkstatebits.ThisregisterisupdatedafterareadofthegenericstatusregisterofaPHY.Thebit
issetifthePHYwiththecorrespondingaddresshaslinkandthePHYacknowledgestheread
transaction.ThebitisresetifthePHYindicatesitdoesnothavelinkorfailstoacknowledgetheread
transaction.Writestotheregisterhavenoeffect.
0ThePHYindicatesitdoesnothavealinkorfailstoacknowledgethereadtransaction
1ThePHYwiththecorrespondingaddresshasalinkandthePHYacknowledgesthereadtransaction.
SPRU941A–April2007EthernetMediaAccessController(EMAC)/57
ManagementDataInput/Output(MDIO)
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