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IMBA-9454B ATX Motherboard
Page 153
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.
Содержание IMBA-9454B
Страница 2: ...IMBA 9454B ATX Motherboard Page ii Revision Date Version Changes 4 February 2009 1 00 Initial release ...
Страница 17: ...IMBA 9454B ATX Motherboard Page 1 Chapter 1 1 Introduction ...
Страница 23: ...IMBA 9454B ATX Motherboard Page 7 Chapter 2 2 Detailed Specifications ...
Страница 32: ...IMBA 9454B ATX Motherboard Page 16 Voltage Current 12 V 10 44 A Table 2 1 Power Consumption ...
Страница 33: ...IMBA 9454B ATX Motherboard Page 17 Chapter 3 3 Unpacking ...
Страница 38: ...IMBA 9454B ATX Motherboard Page 22 Chapter 4 4 Connector Pinouts ...
Страница 61: ...IMBA 9454B ATX Motherboard Page 45 Chapter 5 5 Installation ...
Страница 91: ...IMBA 9454B ATX Motherboard Page 75 Chapter 6 6 BIOS Setup ...
Страница 96: ...IMBA 9454B ATX Motherboard Page 80 BIOS Menu 2 Advanced ...
Страница 140: ...IMBA 9454B ATX Motherboard Page 124 Chapter 7 7 Driver Installation ...
Страница 157: ...IMBA 9454B ATX Motherboard Page 141 Appendix A A BIOS Options ...
Страница 161: ...IMBA 9454B ATX Motherboard Page 145 Appendix B B Terminology ...
Страница 165: ...IMBA 9454B ATX Motherboard Page 149 Appendix C C Digital I O Interface ...
Страница 168: ...IMBA 9454B ATX Motherboard Page 152 Appendix D D Watchdog Timer ...
Страница 171: ...IMBA 9454B ATX Motherboard Page 155 Appendix E E Address Mapping ...
Страница 173: ...IMBA 9454B ATX Motherboard Page 157 Figure E 3 Input Output IO 2 of 2 ...
Страница 174: ...IMBA 9454B ATX Motherboard Page 158 E 3 Interrupt Request IRQ Figure E 4 Interrupt Request IRQ ...
Страница 175: ...IMBA 9454B ATX Motherboard Page 159 E 4 Memory Figure E 5 Memory ...
Страница 176: ...IMBA 9454B ATX Motherboard Page 160 Appendix F F Compatibility ...
Страница 179: ...IMBA 9454B ATX Motherboard Page 163 Appendix G G Hazardous Materials Disclosure ...
Страница 183: ...IMBA 9454B ATX Motherboard Page 167 Appendix H H AC 97 Audio Codec ...
Страница 188: ...IMBA 9454B ATX Motherboard Page 172 Index ...