KINO-QM57A Mini-ITX SBC
Page 141
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 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 E-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.
Содержание KINO-QM57A
Страница 2: ...KINO QM57A Mini ITX SBC Page II Revision Date Version Changes 8 April 2010 1 00 Initial release...
Страница 14: ......
Страница 15: ...KINO QM57A Mini ITX SBC Page 1 1 Introduction Chapter 1...
Страница 23: ...KINO QM57A Mini ITX SBC Page 9 2 Unpacking Chapter 2...
Страница 27: ...KINO QM57A Mini ITX SBC Page 13 CPU cooler P N CF 989B RS...
Страница 28: ...KINO QM57A Mini ITX SBC Page 14 3 Connectors Chapter 3...
Страница 59: ...KINO QM57A Mini ITX SBC Page 45 4 Installation Chapter 4...
Страница 86: ...KINO QM57A Mini ITX SBC Page 72 5 BIOS Screens Chapter 5...
Страница 115: ...KINO QM57A Mini ITX SBC Page 101 Appendix A A Intel AMT Configuration...
Страница 122: ...KINO QM57A Mini ITX SBC Page 108 Appendix B B BIOS Menu Options...
Страница 125: ...KINO QM57A Mini ITX SBC Page 111 Appendix C C One Key Recovery...
Страница 149: ...KINO QM57A Mini ITX SBC Page 135 Appendix D D Terminology...
Страница 154: ...KINO QM57A Mini ITX SBC Page 140 Appendix E E Watchdog Timer...
Страница 157: ...KINO QM57A Mini ITX SBC Page 143 Appendix F F Hazardous Materials Disclosure...