KINO-780AM2 Motherboard
Page 114
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.
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.
Summary of Contents for KINO-780AM2
Page 12: ...KINO 780AM2 Motherboard Page xii...
Page 13: ...KINO 780AM2 Motherboard Page 1 Chapter 1 1 Introduction...
Page 16: ...KINO 780AM2 Motherboard Page 4 Figure 1 3 KINO 780AM2 Dimensions mm...
Page 20: ...KINO 780AM2 Motherboard Page 8 Chapter 2 2 Packing List...
Page 24: ...KINO 780AM2 Motherboard Page 12 Chapter 3 3 Connectors...
Page 45: ...KINO 780AM2 Motherboard Page 33 Chapter 4 4 Installation...
Page 70: ...KINO 780AM2 Motherboard Page 58 Chapter 5 5 BIOS...
Page 114: ...KINO 780AM2 Motherboard Page 102 Appendix A A BIOS Options...
Page 117: ...KINO 780AM2 Motherboard Page 105 Load Optimal Defaults 100 Load Failsafe Defaults 101...
Page 118: ...KINO 780AM2 Motherboard Page 106 Appendix B B Terminology...
Page 122: ...KINO 780AM2 Motherboard Page 110 Appendix C C Digital I O Interface...
Page 125: ...KINO 780AM2 Motherboard Page 113 Appendix D D Watchdog Timer...
Page 128: ...KINO 780AM2 Motherboard Page 116 Appendix E E Hazardous Materials Disclosure...
