5 Replies Latest reply on Nov 29, 2018 2:28 PM by GirijaC_46

    Issues with FRAM SPI communication

      I'm trying to communicate with a CY15B104Q FRAM device over SPI and haven't been able to get it working. I've double and triple-checked all the pin mappings and verified the FRAM device is receiving power. I have the HOLD and WP pins tied to VDD. I've also tried 3 separate FRAM devices and had the same issue with each. I've checked the SPI signals I'm sending to the FRAM device on a scope and they all seem fine. I've tried performing a command to read the status register but can't even get that to work. The RDSR opcode shows correctly on the scope, and is timed correctly with the SI and CS lines, but no data comes back on the SO line from the FRAM device. Any ideas on what could be causing this issue?