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9 AIMB-221 User Manual
Chapter 1 Hardware Configuration
1.9.2 CMOS clear (JCMOS1)
The AIMB-221 motherboard contains a jumper that can erase CMOS data and reset
the system BIOS information. Normally this jumper should be set with pins 1-2
closed. If you want to reset the CMOS data, set JCMOS1 to 2-3 closed for just a few
seconds, and then move the jumper back to 1-2 closed. This procedure will reset the
CMOS to its default setting.
1.9.3 Watchdog timer output (JWDT1)
The AIMB-221 contains a watchdog timer that will reset the CPU or send a signal to
IRQ11 in the event the CPU stops processing. This feature means the AIMB-221 will
recover from a software failure or an EMI problem. The JWDT1 jumper settings con-
trol the outcome of what the computer will do in the event the watchdog timer is
tripped.
Table 1.1: CMOS (JCMOS1)
Function Jumper Setting
* Keep CMOS data
Clear CMOS data
* default setting
1-2 closed
2-3 closed
Table 1.2: Watchdog timer output (JWDT1)
Function Jumper Setting
IRQE
*Reset
* default setting
Note! The interrupt output of the watchdog timer is a low level signal. It will be
held low until the watchdog timer is reset.
1-2 closed
2-3 closed