Retaining unused logic with Quartus?

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Another option would be to have inputs/outputs drive them, and then assign those inputs/outputs to be virtual pins(so they don't have to use real I/O). That may be the best solution for what your trying to do.

And why are you trying to add logic that does nothing?

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Who says that my logic does nothing? I merely said that it wasn't connected to anything. ;)

As for your virtual pin suggestion, I'm pleasantly surprised that it seems to have worked. Not exactly what I had in mind, but quite suitable, I think. Thanks for your help.