W89C840F
F10/FBIOA Base I/O Address Register
This register is written by software after power-on to specify W89C840F base I/O address in the system.
Bit
Attribute
R/W
Bit name
BIOA
Description
31: 7
Base I/O Address.
Written by power-on software to specify base I/O address. The
W89C840F requires 128 bytes wide I/O space.
6:1
0
R
R
---
IO
Reserved. Fixed at 0.
I/O Space Indicator.
Fixed at 1.
F14/FBMA Base Memory Address Register
This register is written by power-on software to specify W89C840F base memory address in the system.
Bit
Attribute
R/W
Bit name
BMA
Description
31: 7
Base Memory Address.
Written by power-on software to specify base memory address. The
W89C840F r equi r es 128 bytes wide memory space.
6:1
0
R
R
---
Reserved. Fixed at 0.
Memory Space Indicator.
Fixed at 0.
MEM
F2C/FSSID Subsystem ID Register
This register is loaded from the external EEPROM. The W89C840F will issue a Retry signal to host
when the host tries to access to this register while the EEPROM auto-loading is not yet completed.
Bit
Attribute
R
Bit name
SBID
Description
31:16
Subsystem ID.
Loaded from EEPROM after Hardware reset de-asserted.
Subsystem Vendor ID.
15:0
R
SBVID
Loaded from EEPROM after Hardware reset de-asserted
- 30 -
ETC [ ETC ]
