EKF PC7-FESTIVAL, User Manual, Page: 81 / 108

User Guide • PC7-FESTIVAL • CompactPCI® PlusIO CPU Board
RTC Reset (J-RTC)
The jumper J-RTC may be used to reset certain register bits of the battery backed RTC core within
the PCH CM238. This can be necessary under rare conditions (e.g. battery undervoltage), if the
CPU fails to enter the UEFI/BIOS POST after power on.
Note: The installing of jumper J-RTC will neither set UEFI/BIOS Setup to EKF Factory Defaults nor
resets the time and date register values of the RTC (Real Time Clock). To reset the RTC core the
board must be removed from the system rack. Short-circuit the pins of J-RTC for about 1 sec.
Thereafter reinstall the board to the system and switch on the power. The pin header J-RTC is not
stuffed on the PC7-FESTIVAL by default.
Note: It is important to accomplish the RTC reset while the board has no power.
J-GP Function
Jumper removed
1)
Normal operation
Jumper installed RTC reset performed
1) This setting is the factory default
J-RTC
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