Was not looking forward to tapping the PSRAM CS, but then I remembered the custom milled test point pins we made last year. Nice grip with just a few seconds of soldering.
Chip was looking messy, so I cleaned it up with finger nail polish remover. Then I hit all 8 pins with a bit of flux and extra solder.
I only have time for a quick peek at the CS pin right now. It is held by a pull-up resistor, so it should stay high unless the RP2350 pulls it low. It is wiggling, and with consistent timing.
Next I’ll need to connect to the 4 data pins and see what’s being send/replied.