IEM-945GSE ETX 3.0 Module
Page 124
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 C-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.
Содержание IEM-945GSE
Страница 13: ...IEM 945GSE ETX 3 0 Module Page 1 Chapter 1 1 Introduction ...
Страница 19: ...IEM 945GSE ETX 3 0 Module Page 7 Chapter 2 2 Detailed Specifications ...
Страница 30: ...IEM 945GSE ETX 3 0 Module Page 18 Voltage Current 5 V 2 9 A 12 V 0 95 A Table 2 2 Power Consumption ...
Страница 31: ...IEM 945GSE ETX 3 0 Module Page 19 Chapter 3 3 Unpacking ...
Страница 35: ...IEM 945GSE ETX 3 0 Module Page 23 Chapter 4 4 Connectors ...
Страница 51: ...IEM 945GSE ETX 3 0 Module Page 39 Pin No Description 6 GND Table 4 7 SPI Flash Connector Pin Definitions ...
Страница 52: ...IEM 945GSE ETX 3 0 Module Page 40 Chapter 5 5 Installation ...
Страница 56: ...IEM 945GSE ETX 3 0 Module Page 44 Chapter 6 6 BIOS Setup ...
Страница 102: ...IEM 945GSE ETX 3 0 Module Page 90 Chapter 7 7 Software Installation ...
Страница 128: ...IEM 945GSE ETX 3 0 Module Page 116 Appendix A A BIOS Options ...
Страница 131: ...IEM 945GSE ETX 3 0 Module Page 119 Appendix B B Terminology ...
Страница 135: ...IEM 945GSE ETX 3 0 Module Page 123 Appendix C C Watchdog Timer ...
Страница 138: ...IEM 945GSE ETX 3 0 Module Page 126 Appendix D D Address Mapping ...
Страница 141: ...IEM 945GSE ETX 3 0 Module Page 129 D 4 Memory Figure D 5 Memory ...
Страница 142: ...IEM 945GSE ETX 3 0 Module Page 130 Appendix E E Compatibility ...
Страница 145: ...IEM 945GSE ETX 3 0 Module Page 133 Appendix F F Hazardous Materials Disclosure ...