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2807940 uATX Motherboard
Page 123
NOTE:
The following discussion applies to DOS environment. GAI support is
contacted or the GAI 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 EMI 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.
BL:
Time-out value (Its unit-second is dependent on the item “Watchdog
Timer unit select” in CMOS setup).
Table C-1: AH-6FH Sub-function
Call sub-function 2 to set the time-out period of Watchdog Timer first. If the time-out value
is not zero, the Watchdog Timer starts counting down. While the timer value reaches zero,
the system resets. To ensure that this reset condition does not occur, calling sub-function
2 must periodically refresh the Watchdog Timer. However, the Watchdog timer is disabled
if the time-out value is set to zero.
A tolerance of at least 10% must be maintained to avoid unknown routines within the
operating system (DOS), such as disk I/O that can be very time-consuming.
Summary of Contents for 2807940
Page 1: ...x x 2807940 User s Manual Micro ATX Motherboard with LGA 775 Socket Version 1 0 ...
Page 17: ...2807940 uATX Motherboard Page 1 1 Introduction Chapter 1 ...
Page 24: ...2807940 uATX Motherboard Page 8 2 Detailed Specifications Chapter 2 ...
Page 55: ...2807940 uATX Motherboard Page 39 3 Unpacking Chapter 3 ...
Page 59: ...2807940 uATX Motherboard Page 43 4 Connector Pinouts Chapter 4 ...
Page 88: ...2807940 uATX Motherboard Page 72 5 Installation Chapter 5 ...
Page 120: ...2807940 uATX Motherboard Page 104 6 Intel AMT Configuration Chapter 8 ...
Page 130: ...2807940 uATX Motherboard Page 114 A Terminology Appendix A ...
Page 135: ...2807940 uATX Motherboard Page 119 B DIO Interface Appendix B ...
Page 138: ...2807940 uATX Motherboard Page 122 C Watchdog Timer Appendix C ...
Page 141: ...2807940 uATX Motherboard Page 125 D Address Mapping Appendix D ...
Page 144: ...2807940 uATX Motherboard Page 128 E Compatibility Appendix E ...
Page 147: ...2807940 uATX Motherboard Page 131 F Intel Matrix Storage Manager Appendix F ...
Page 161: ...2807940 uATX Motherboard Page 145 G Hazardous Materials Disclosure Appendix G ...