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4.14MDIOUserAccessRegister1(USERACCESS1)
MDIORegisters
TheMDIOuseraccessregister1(USERACCESS1)isshowninFigure28anddescribedinTable27.
Figure28.MDIOUserAccessRegister1(USERACCESS1)
313029282625212016
GOWRITEACKReservedREGADRPHYADR
R/WS-0R/W-0R/W-0R-0R/W-0R/W-0
150
DATA
R/W-0
LEGEND:R=Readonly;R/W=Read/Write;R/WS=Read/Write1toset;-n=valueafterreset
Table27.MDIOUserAccessRegister1(USERACCESS1)FieldDescriptions
BitFieldValueDescription
31GOGobit.Writinga1tothisbitcausestheMDIOstatemachinetoperformanMDIOaccesswhenitis
convenientforittodoso,thisisnotaninstantaneousprocess.Writinga0tothisbithasnoeffect.
ThisbitiswriteableonlyiftheMDIOstatemachineisenabled.Thisbitwillselfclearwhenthe
requestedaccesshasbeencompleted.AnywritestotheUSERACCESS0registerareblocked
whenthegobitis1.
30WRITEWriteenablebit.Settingthisbittoa1causestheMDIOtransactiontobearegisterwrite,otherwise
itisaregisterread.
0Theusercommandisareadoperation
1Theusercommandisawriteoperation
29ACKAcknowledgebit.ThisbitissetifthePHYacknowledgedthereadtransaction.
28-26Reserved0Reserved
25-21REGADRRegisteraddressbits.ThisfieldspecifiesthePHYregistertobeaccessedforthistransaction
20-16PHYADRPHYaddressbits.ThisfieldspecifiesthePHYtobeaccessesforthistransaction
15-0DATAUserdatabits.ThesebitsspecifythedatavaluereadfromortobewrittentothespecifiedPHY
register.
SPRU975B–August2006EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)79
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