FLEX-BX100-ULT5
Page 101
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 FLEX-BX100-ULT5
Page 2: ...FLEX BX100 ULT5 Page ii Revision Date Version Changes January 14 2021 1 00 Initial release...
Page 12: ...FLEX BX100 ULT5 Page xii Figure 6 1 Main Board Layout Diagram 73...
Page 15: ...FLEX BX100 ULT5 Page 1 Chapter 1 1 Introduction...
Page 23: ...FLEX BX100 ULT5 Page 9 Chapter 2 2 Unpacking...
Page 27: ...FLEX BX100 ULT5 Page 13 Chapter 3 3 Installation...
Page 47: ...FLEX BX100 ULT5 Page 33 Chapter 4 4 BIOS...
Page 82: ...FLEX BX100 ULT5 Page 68 Chapter 5 5 Troubleshooting and Maintenance...
Page 86: ...FLEX BX100 ULT5 Page 72 6 Interface Connectors Chapter 6...
Page 100: ...FLEX BX100 ULT5 Page 86 Appendix A A Regulatory Compliance...
Page 105: ...FLEX BX100 ULT5 Page 91 B Safety Precautions Appendix B...
Page 111: ...FLEX BX100 ULT5 Page 97 Appendix C C BIOS Menu Options...
Page 114: ...FLEX BX100 ULT5 Page 100 Appendix D D Watchdog Timer...
Page 117: ...FLEX BX100 ULT5 Page 103 Appendix E E Error Beep Code...
Page 119: ...FLEX BX100 ULT5 Page 105 Appendix F F Hazardous Materials Disclosure...
