PCIE-Q370 Full-size PICMG 1.3 CPU Card
Page 122
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.
Summary of Contents for PCIE-Q370
Page 15: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 1 Chapter 1 1 Introduction ...
Page 24: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 10 Chapter 2 2 Packing List ...
Page 29: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 15 Chapter 3 3 Connectors ...
Page 58: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 44 Chapter 4 4 Installation ...
Page 76: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 62 Chapter 5 5 BIOS ...
Page 120: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 106 Appendix A A Regulatory Compliance ...
Page 122: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 108 B Product Disposal Appendix B ...
Page 124: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 110 Appendix C C BIOS Options ...
Page 127: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 113 ...
Page 128: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 114 Appendix D D Terminology ...
Page 132: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 118 Appendix E E Digital I O Interface ...
Page 135: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 121 Appendix F F Watchdog Timer ...
Page 138: ...PCIE Q370 Full size PICMG 1 3 CPU Card Page 124 Appendix G G Hazardous Materials Disclosure ...