I was looking at a board schematic and noticed something odd. All the IO pins are identical in function. But for some reason, there is one IO pin that has both a pull up resistor and a capacitor to ground connected to it (while all the others have nothing). Why is this?
(The IO pins come from a CycloneII EP2C5 FPGA if that's relevant info. I've looked at the pin out documentation for the chip but there's nothing particularly special about this pin. The FPGA is mounted on a bare bones general purpose development board, and as such has no specific intended function. And all the circuitry on the board is just supporting circuitry like power.)