Hello,

The official espressif FAQ on hardware says:

The ESP32-U4WDH chip supports external PSRAM chips. However, only the ESP-PSRAMXXH chip released by Espressif is supported. Third-party PSRAM chips are not supported.
For hardware design, all the PSRAM pins except for the CS pin can be ...

Hello,

Sorry to revive this dead post, but I'm facing the same issue.
I tried connecting the ESP32-U4WDH with PSRAM, using a LY68L6400 PSRAM chip.
However, my design does not work.
After further investigation, I found out that :


The ESP32-U4WDH chip supports external PSRAM chips. However, only ...