w89c840af Winbond Electronics Corp America, w89c840af Datasheet - Page 33

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

F08/FREV Device Revision Register
F0C/FLT Latency Timer Register
This register specify the W89C840AF master bus latency timer.
Bit
31:24
23:16
15:8
7:0
Bit
31:16
15:8
7:0
5:3
2
1
0
This register, a read-only with built-in code, shows W89C840AF revision number and its
class code.
Attribute
R
R
R
R
Attribute
R
R/W
R
R
R/W
R/W
R/W
Bit name
BC
SC
IC
REV
Bit name
---
LT
---
IOS
BM
MS
---
Description
Base Class Code.
Fixed at 02h to indicate a network controller.
Subclass Code.
Fixed at 00h to indicate a Ethernet controller.
Interface Code. Fixed at 0.
Revision ID.
This field represents the revision number.
Loaded from EEPROM after hardware reset de-asserted
Description
Fixed to 0.
Latency Timer.
Specify, in units of PCI clocks, the latency timer value of
W89C840AF. When W89C840AF asserts FRAMEB, its latency
timer starts counting up. The W89C840AF will initiate the
transaction termination as soon as its GNT# de-asserted If the timer
expired before W89C840AF de-asserts FRAMEB.
Fixed at 0.
Reserved. Fixed at 0.
Bus Master.
Set BM to high will allow W89C840AF acting as a bus master.
Reset BM to low will disable the W89C840AF
ability.
Memory Space.
Set MS to high will allow W89C840AF to respond to memory
space access by the host.
I/O Space.
Set IOS to high will allow W89C840AF to respond to I/O space
access by the host.
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Publication Release Date:October 2000
Revision 1.01
W89C840AF
bus master