ECK-3692G Embedded System
Page 140
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 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. 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.
Summary of Contents for ECK-3692
Page 1: ...ECK 3692G Embedded System Page i ECK 3692G Embedded System...
Page 2: ...ECK 3692G Embedded System Page ii Revision Date Version Changes 2008 04 1 00 Initial Release...
Page 17: ...ECK 3692G Embedded System Page 1 1 Introduction Chapter 1...
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Page 27: ...ECK 3692G Embedded System Page 11 2 Mechanical Description Chapter 2...
Page 33: ...ECK 3692G Embedded System Page 17 3 System Components Chapter 3...
Page 51: ...ECK 3692G Embedded System Page 35 4 Installation Chapter 4...
Page 59: ...ECK 3692G Embedded System Page 43 Figure 4 7 Power Button and Power LED...
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Page 61: ...ECK 3692G Embedded System Page 45 5 AMI BIOS Setup Chapter 5...
Page 101: ...ECK 3692G Embedded System Page 85 6 Driver Installation Chapter 6...
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Page 123: ...ECK 3692G Embedded System Page 107 7 Troubleshooting and Maintenance Chapter 7...
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Page 139: ...ECK 3692G Embedded System Page 123 A Safety Precautions Appendix A...
Page 143: ...ECK 3692G Embedded System Page 127 B IEI Embedded System Series Appendix B...
Page 151: ...ECK 3692G Embedded System Page 135 C BIOS Menu Options Appendix C...
Page 155: ...ECK 3692G Embedded System Page 139 D Watchdog Timer Appendix D...
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Page 159: ...ECK 3692G Embedded System Page 143 E Address Mapping Appendix D...
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Page 163: ...ECK 3692G Embedded System Page 147 F Hazardous Materials Disclosure Appendix E...