W89C841F Datasheet, PDF (74/102 Pages) Winbond – 3-IN - 1 10/100M FAST ETHERNET CONTROLLER

W89C841F/D
Dc4/DEEAR EEPROM Access Register
The register is used to read or write information between system and EEPROM.
BIT
31
30
29:28
27:23
22:16
15:0
ATTRIBUTE
R/W
R/W
R/W
R
R/W
R/W
BIT NAME
EESEL
StartEERW
EERW
-------
EEOA
EEData
DESCRIPTION
EEPROM/BootROM Select
1: EEPROM access through Dc4/DEEAR is allowed.
(default)
0: BootROM access through Dc0/DBRAR is allowed.
Start EEPROM Read/Write Access
Set to 1, to start EEPROM RD/WR access. It will be cleared
to 0 automatically, after access is complete.
EEPROM Read/Write Command
00: Read
01: Write
10: Write Protection Disable
11: Write Protection Enable
Reserved. Fixed to 0
EEPROM Offset Address
This field contains EEPROM offset address.
EEPROM Data
EEPROM Data is used to store the read/write data for the
on board EEPROM access when EESEL is set to high.
EEData is of no meaning if the EESEL is set to low.
Dc8/DMMAR MII Management Access Register
The register is used to read or write information between system and MII management registers in
transceiver.
BIT ATTRIBUTE BIT NAME
DESCRIPTION
31
30:29
R/W
StartMDIORW Start MDIO Read/Write
When set to 1, MDIO starts to read/ write PHY data.
It will be clear automatically, when access completes.
R/W
MDIORW MDIO RD/WR command
01: Write
10: Read (default)
00, 11: reserved
- 74 -