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User Guide XB1 COM Express Module
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Configuration Jumpers
Reset Jumper BIOS CMOS RAM Values (J-GP)
The jumper J-GP is used to reset the contents of the battery backed CMOS RAM to their default state.
The BIOS uses the CMOS to store configuration values, e.g. the order of boot devices. Using this
jumper is appropriate only, if it is not possible to enter the setup screen of the BIOS. To restore the
CMOS RAM, install a short circuit jumper on JGP and perform a system reset. As long as the jumper
is stuffed, the BIOS will use the default CMOS values after any system reset. To get normal operation
again, the jumper has to be removed.
JGP Function
Jumper removed
1)
No CMOS reset performed
Jumper set CMOS reset performed
1)
This setting is the factory default
Reset Jumper ICH6 RTC Core (J-RTC)
The jumper J-RTC can be used to reset the battery backed core of the ICH6. This effects some registers
within the ICH6 RTC core that are important before the CPU starts its work after a system reset. Note
that JRTC will neither perform the clearing of the CMOS RAM values nor resets the real time clock.
Normally JRTC is not stuffed on the XB1 COM Express Module. To reset the RTC core, the XB1 COM
Express Module must be removed from the carrier board. It is important to accomplish the RTC reset
while the module has no power applied to it. Short-circuit the JRTC pads for about 1s. After that,
reinstall the module to the carrier and switch on the power.
JRTC Function
Jumper OFF
1)
No RTC reset performed
Jumper ON RTC reset performed
1)
This setting is the factory default
JGP
1=GPI6 2=GND
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JRTC
1=RTCRST# 2=GND
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