I'm having some strange issues with an FPGA on a custom board. I had copied and pasted he design and layout from a previous project that didn't have any issue so I'm confident the design is okay.
The issues I'm having are:
- A few GPIOs do not go to the VCCIO voltage (3.3V) instead they only reach around 1.4V and are very flaky with the pressure I apply with the probe making a difference.
- I'm try to use a PLL to create 80MHz from 100MHz which isn't working at all.
I assembled the PCB myself, the FPGA is an EP4CE6E22N, I've assembled a lot of PCBs in my time so confident it's okay. Could these issues be caused by ESD or a faulty IC?
Thanks