W89C841F Datasheet, PDF (41/102 Pages) Winbond – 3-IN - 1 10/100M FAST ETHERNET CONTROLLER

W89C841F/D
F30/FERBA Expansion ROM Base Address Register
This register is written by power-on software to specify the on-board Boot ROM base address in the
system.
BIT
31:13
12:1
0
ATTRIBUTE
R/W
R
R/W
BIT NAME
EROMB
---
ROME
DESCRIPTION
Expansion ROM Base Address
Written by power-on software to specify expansion ROM
base address. W89C841F will request up to 256K bytes
memory space for the on board Boot ROM according the
configuration of bit BROMSEL of register
Dc0/DBRAR[30:28].
Reserved. Fixed at 0.
Expansion ROM Enable
Set both of this bit and memory space bit of register
F04/FCS[1] to 1 to enable expansion ROM access ability.
F34/FCAPPR Capabilities Pointer Register
W89C841F has the capabilities of Power Management and/or Vital Product Data. This register is read-
only and is used as the start pointer of capabilities list.
BIT ATTRIBUTE BIT NAME
DESCRIPTION
31:8
R
---
Reserved. Fixed at 0.
7:0
R
CAPPR Capabilities Pointer
The value is dependent on the PMEn and VPDEn loaded
from EEPROM to decide the W89C841F power
management and VPD capability.
If PMEn = 1, CAPPR is set to DCh.
If PMEn = 0 and VPDEn = 1, CAPPR is set to E4h.
If PMEn = 0 and VPDEn = 0, CAPPR is set to 00h.
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Publication Release Date: October 18, 2001
Revision A3