W89C841F Datasheet, PDF (42/102 Pages) Winbond – 3-IN - 1 10/100M FAST ETHERNET CONTROLLER

W89C841F/D
F3C/FIR Interrupt Register
This register stores the MAX Latency Timer and Min Grant Timer. They are loaded from EEPROM.
BIT
31:24
23:16
15:8
7:0
ATTRIBUTE
R
R
R
R/W
BIT NAME
MAXLAT
MINGNT
IPIN
ILINE
DESCRIPTION
Max Latency Timer
Loaded from EEPROM. Indicates how often, in units of 0.25
µS, W89C841F needs to gain access to PCI bus. Assuming
PCI clock rate is 33 MHz.
Min Grant Timer
Loaded from EEPROM. Indicates how long a burst period,
in units of 0.25 µS, is needed by W89C841F. Assuming PCI
clock rate is 33 MHz.
Interrupt Pin
Fixed at 01h. Indicates INTAB is used.
Interrupt Line
Written by power-on software to specify routing of interrupt
line.
F40/FSR Signature Register
The register is designed for identifying the hardware of W89C841F.
BIT
31:16
15:8
7:0
ATTRIBUTE
R/W
R
R
BIT NAME
DVAR
---
SIG
DESCRIPTION
Driver Area
This field is for driver special use. The driver can write some
specific pattern to these bits for bundling the software and
hardware of W89C841F together.
Reserved. Fixed at 0.
Signature
After the hardware reset, these 8 bits value is toggled as
following
SIG = 70h at (2N-1)th read
44h at 2Nth read Where N = 1, 2, ....
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