I'm having an issue with a custom CM3 carrier board. Attached is the schematic that I'm using. I've tried to duplicate the EMMC_DISABLE_N logic and EMMC_EN_N logic as close as possible to the CM3 development board. Q1/Q7 is a AO3414 N-Channel MOSFET 20V/4.2A (https://www.digikey.com/products/en?key ... -1009-1-nd).
The board works when the SD card is not inserted and used with a CM3 (booting from EMMC), but does not work when a CM3L and SD Card is inserted in the slot. I've tried to make the SDX_D0-D3/CMD/CLK traces as equal length as possible (within 100 mils) and minimal via's (max 2 per line). Lines are all 10 mils with a 6 mil spacing.
Can anybody see what I'm missing?