SYS_RESET still stay high when system power off from ubuntu

Power of our base board 's peripheral devices is control by this pin .
But , somehow ,this pin still stay high when enter power down mode.

On NX DEVKIT , SYS_RESET pin is LOW level when in power off state ,
but when we replace the base board with our, this pin will keep high in power off.

what is the control logic of this pin on SOM ?and how to pull down this pin?

SYS_RESET is tied to PMIC, if it is high still, then it means the PMIC is not in power off status as the pull-up level is still 1.8V. Please check your power part design and compare to reference schematic.

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