IMB-H810-i2 microATX Motherboard
Page 151
NOTE:
The following discussion applies to DOS environment. Contact IEI support
or visit the IEI website for specific drivers for other operating systems.
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.
BL:
Time-out value (Its unit-second is dependent on the item “Watchdog
Timer unit select” in CMOS setup).
Table D-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. When 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.
Содержание IMB-H810-ECO-R11
Страница 16: ......
Страница 17: ...IMB H810 i2 microATX Motherboard Page 1 Chapter 1 1 Introduction ...
Страница 25: ...IMB H810 i2 microATX Motherboard Page 9 Chapter 2 2 Packing List ...
Страница 31: ...IMB H810 i2 microATX Motherboard Page 15 Chapter 3 3 Connectors ...
Страница 66: ...IMB H810 i2 microATX Motherboard Page 50 Chapter 4 4 Installation ...
Страница 84: ...IMB H810 i2 microATX Motherboard Page 68 Chapter 5 5 BIOS ...
Страница 136: ...IMB H810 i2 microATX Motherboard Page 120 6 Software Drivers Chapter 6 ...
Страница 156: ...IMB H810 i2 microATX Motherboard Page 140 Appendix A A Regulatory Compliance ...
Страница 158: ...IMB H810 i2 microATX Motherboard Page 142 Appendix B B BIOS Options ...
Страница 162: ...IMB H810 i2 microATX Motherboard Page 146 Appendix C C Terminology ...
Страница 166: ...IMB H810 i2 microATX Motherboard Page 150 Appendix D D Watchdog Timer ...
Страница 169: ...IMB H810 i2 microATX Motherboard Page 153 Appendix E E Hazardous Materials Disclosure ...