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NANO-9453 EPIC Motherboard
Page 206
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.
Содержание NANO-9453
Страница 1: ...NANO 9453 EPIC Motherboard Page i...
Страница 19: ...NANO 9453 EPIC Motherboard Page 1 1 Introduction Chapter 1...
Страница 25: ...NANO 9453 EPIC Motherboard Page 7 2 Detailed Specifications Chapter 2...
Страница 52: ...NANO 9453 EPIC Motherboard Page 34 3 Unpacking Chapter 3...
Страница 58: ...NANO 9453 EPIC Motherboard Page 40 4 Connector Pinouts Chapter 4...
Страница 67: ...NANO 9453 EPIC Motherboard Page 49 Figure 4 7 CF Card Socket Location...
Страница 92: ...NANO 9453 EPIC Motherboard Page 74 5 Installation Chapter 5...
Страница 103: ...NANO 9453 EPIC Motherboard Page 85 Figure 5 7 CF Card Installation...
Страница 125: ...NANO 9453 EPIC Motherboard Page 107 Figure 5 24 USB Connector...
Страница 126: ...NANO 9453 EPIC Motherboard Page 108 6 AMI BIOS Chapter 6...
Страница 165: ...NANO 9453 EPIC Motherboard Page 147 BIOS Menu 15 PCI PnP Configuration Clear NVRAM No...
Страница 175: ...NANO 9453 EPIC Motherboard Page 157 BIOS Menu 18 Boot Device Priority Settings...
Страница 189: ...NANO 9453 EPIC Motherboard Page 171 7 Driver Installation Chapter 7...
Страница 210: ...NANO 9453 EPIC Motherboard Page 192 A BIOS Options Appendix A...
Страница 215: ...NANO 9453 EPIC Motherboard Page 197 B Terminology Appendix B...
Страница 220: ...NANO 9453 EPIC Motherboard Page 202 C DIO Interface Appendix C...
Страница 223: ...NANO 9453 EPIC Motherboard Page 205 D Watchdog Timer Appendix D...
Страница 226: ...NANO 9453 EPIC Motherboard Page 208 E Address Mapping Appendix E...
Страница 230: ...NANO 9453 EPIC Motherboard Page 212 F Compatibility Appendix F...
Страница 233: ...NANO 9453 EPIC Motherboard Page 215 G Hazardous Materials Disclosure Appendix G...
Страница 237: ...NANO 9453 EPIC Motherboard Page 219 H Index...