Filter
Top Products
www.ti.com
4.13MDIOUserAccessRegister1(USERACCESS1)
MDIORegisters
TheMDIOuseraccessregister1(USERACCESS1)isshowninFigure25anddescribedinTable23.
Figure25.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;WS=Write1toset;-n=valueafterreset
Table23.MDIOUserAccessRegister1(USERACCESS1)FieldDescriptions
BitFieldValueDescription
31GO0-1Gobit.Writing1tothisbitcausestheMDIOstatemachinetoperformanMDIOaccesswhenitis
convenientforittodoso;thisisnotaninstantaneousprocess.Writing0tothisbithasnoeffect.
ThisbitiswriteableonlyiftheMDIOstatemachineisenabled.Thisbitwillselfclearwhenthe
requestedaccesshasbeencompleted.AnywritestoUSERACCESS0areblockedwhentheGO
bitis1.
30WRITEWriteenablebit.Settingthisbitto1causestheMDIOtransactiontobearegisterwrite;otherwise,
itisaregisterread.
0Theusercommandisareadoperation.
1Theusercommandisawriteoperation.
29ACK0-1Acknowledgebit.ThisbitissetifthePHYacknowledgedthereadtransaction.
28-26Reserved0Reserved
25-21REGADR0-1FhRegisteraddressbits.ThisfieldspecifiesthePHYregistertobeaccessedforthistransaction
20-16PHYADR0-1FhPHYaddressbits.ThisfieldspecifiesthePHYtobeaccessedforthistransaction.
15-0DATA0-FFFFhUserdatabits.ThesebitsspecifythedatavaluereadfromortobewrittentothespecifiedPHY
register.
66EthernetMediaAccessController(EMAC)/SPRU941A–April2007
ManagementDataInput/Output(MDIO)
SubmitDocumentationFeedback