I have a DE0-Nano wired to one of the PS2 connectors on the PPDB and it works. I was wondering since the DE0-Nano is not 5V tolerant that I should do some level shifting to protect the DE0-Nano? Thanks.


  • I just looked at the PPDB schematic and it uses 3.3V pull ups so it looks like it is already 3.3V safe. I do have the VGA/Keyboard breakout as well but that has 5V pull ups so that one would require level shifting
  • You should be able to just use series resistors for 5V protection. Try 3K3 although you might be able to go down to 1k safely. I am not certain about the input protection on the FPGA. It’s not likely to be as robust as the prop.
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