w89c840af Winbond Electronics Corp America, w89c840af Datasheet - Page 34

• Manufacturer Part Number: w89c840af
• Description: 100/10mbps Ethernet Controller
• Manufacturer: Winbond Electronics Corp America

F10/FBIOA Base I/O Address Register
This register is written by software after power-on to specify W89C840AF base I/O address in the system.
F14/FBMA Base Memory Address Register
This register is written by power-on software to specify W89C840AF base memory address in the system.
F2C/FSSID Subsystem ID Register
the host tries to access to this register while the EEPROM auto-loading is not yet completed.
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: 7
6:1
0
Bit
31: 7
6:1
0
Bit
31:16
15:0
Bit
This register is loaded from the external EEPROM. The W89C840AF will issue a Retry signals to host when
Attribute
R/W
R
R
Attribute
R/W
R
R
Attribute
R
R
Attribute
Bit name
BIOA
---
IO
Bit name
BMA
---
MEM
Bit name
SBID
SBVID
Bit name
Description
Base I/O Address.
Written by power-on software to specify base I/O address. The
W89C840AF requires a 128 bytes wide I/O space.
Reserved. Fixed at 0.
I/O Space Indicator.
Fixed at 1.
Description
Base Memory Address.
Written by power-on software to specify base memory address. The
W89C840AF requires a 128 bytes wide memory space.
Reserved. Fixed at 0.
Memory Space Indicator.
Fixed at 0.
Description
Subsystem ID.
Loaded from EEPROM after Hardware reset de-asserted.
Subsystem Vendor ID.
Loaded from EEPROM after Hardware reset de-asserted
Description
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Publication Release Date:October 2000
Revision 1.01
W89C840AF