I am designing the carrier board and could you please help me understand the usage of these pins:
SODIMM PIN24 (Battery Fault Detect): Is this an ACTIVE-LOW input for the IMX6 or output from the IMX6? NXP’s documentation show this as a GPIO by default. What is the use case of this pin?
SODIMM PIN22 (VDD Fault Detect): Same question as #1 above for this PIN.
SODIMM PIN26 (nReset In): Is this an ACTIVE-LOW input to reset the CPU?
SODIMM PIN87 (nReset Out): What is the use case for this pin?
The Colibri PXAxx modules have dedicated purpose for Battery Fault Detect and VDD Fault Detect signals. On other modules they just directly connected to SOM and can be use as GPIO or alternative function. Please check table 4.4.1 SODIMM 200 of Colibri iMX6 datasheet for details.
nReset In is active LOW. nReset Out (aka (CTRL_RESET_MOCi) indicates completion of SOM reset sequence and start of normal operation. Please check chapter 3.4 Power-Up Sequence of Colibri Carrier Board Design Guide for more details.
I’m highly recommend to get more familiar with our design guides while doing custom carrier board design.