User’s Manual
Custom Embedded Solutions
WIN Enterprises, Inc. [email protected] www-win-ent.com (978)688-2000
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Bypass Behavior C:
2. How to control Segment 1 & 2 bypass function by watchdog timer
Please follow below steps to set the LAN bypass function control by watchdog
timer.
(1). Setup jumper JP2 to 1-2 shorted to enable bypass function when watchdog
timer time-out.
(2). Refer to watchdog timer section to set timer interval value and enable
watchdog timer.
Note: Once the watchdog timer time-out you need to restart the system to reset
the timer.
3. How to control Segment 1 & 2 LAN bypass function by GPIO during power
on state
The bypass function can be enabled or disabled through ICH GPIO38 & GPIO39
during power on state. Below is the I/O port address and control bit.
Power ON State Bypass Control Status Register
I/O Address: 4B8H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
W
W
X
X
X
X
X
X
W: Write, X: Not used
