I have a custom PCB where the ADS124S06 communicates with a processor off the board over SPI. We have the CS# pin grounded, RESET# tied high, and I have probed the logic vdd and analog vdd pins, and they readout correctly. Below is the schematic for clarity.
The issue arises when we attempt to communicate over the SPI bus. Below are the logic analyzer results.
As can be seen we either receive invalid data or nothing at all. One possible problem could be that our chip select pin is tied to the START/SYNC pin, but floating this pin or tying it low still results in the same problem. The real kicker is the device was allowing us to read/write registers (but was not converting), but then suddenly stopped for no obvious reason.
Any help would greatly appreciated, and thank you for your time!