IEI Integration IMBA-9454 v4.02 - Manual (Page 184)

IMBA-9454G Motherboard
Page 166
NOTE:
The following discussion applies to DOS environment. IEI support is contacted
or the IEI website visited for specific drivers for more sophisticated operating
systems, e.g., Windows and Linux.
The Watchdog Timer is provided to ensure that standalone systems can always recover
from catastrophic conditions that cause the CPU to crash. This condition may have
occurred by external EMIs or a software bug. When the CPU stops working correctly,
Watchdog Timer either performs a hardware reset (cold boot) or a Non-Maskable Interrupt
(NMI) to bring the system back to a known state.
A BIOS function call (INT 15H) is used to control the Watchdog Timer.
INT 15H:
AH – 6FH Sub-function:
AL – 2: Sets the Watchdog Timer’s period.