Honored Contributor
Honored Contributor"nothing has been assigned to the pin where LEDR7" would mean, that it should be set according to the unused pins default. I can't imagine a reason, why the fitter should assign anything different here, but you should check in the fitter pinout report. Personally I don't like the "driving ground" feature, because there's always a certain risk, that unused pins are connected different in the hardware design and could be possibly damaged in this case. But that's a different problem.
Anyway, what happens, if you drive the R7 output explicitely to GND? I assumed first, that you are driving the LEDs active low, but understand, that they are active high, most likely you have a DE-2 board?
