IMB-H110 microATX Motherboard
Page 142
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 F-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-H110
Страница 11: ...IMB H110 microATX Motherboard Page xi Figure 4 24 Update Process is Complete 79 ...
Страница 15: ...IMB H110 microATX Motherboard Page xv BIOS Menu 31 Save Exit 125 ...
Страница 16: ...IMB H110 microATX Motherboard Page 1 Chapter 1 1 Introduction ...
Страница 25: ...IMB H110 microATX Motherboard Page 10 Chapter 2 2 Packing List ...
Страница 30: ...IMB H110 microATX Motherboard Page 15 Chapter 3 3 Connectors ...
Страница 71: ...IMB H110 microATX Motherboard Page 56 Chapter 4 4 Installation ...
Страница 96: ...IMB H110 microATX Motherboard Page 81 Chapter 5 5 BIOS ...
Страница 141: ...IMB H110 microATX Motherboard Page 126 Appendix A A Regulatory Compliance ...
Страница 143: ...IMB H110 microATX Motherboard Page 128 B Product Disposal Appendix B ...
Страница 145: ...IMB H110 microATX Motherboard Page 130 Appendix C C BIOS Options ...
Страница 149: ...IMB H110 microATX Motherboard Page 134 Appendix D D Terminology ...
Страница 153: ...IMB H110 microATX Motherboard Page 138 Appendix E E Digital I O Interface ...
Страница 156: ...IMB H110 microATX Motherboard Page 141 Appendix F F Watchdog Timer ...
Страница 159: ...IMB H110 microATX Motherboard Page 144 Appendix G G Hazardous Materials Disclosure ...