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XC2000/XC4000/XC5200- I/O pullup/pulldown availability
Using PULLUPs and PULLDOWNS with Inputs/Outputs
2k: Although there are pullups on unused I/O before configuration, after
configuration there are no usable I/O pullups after configuration.
3k: Pullups only, but can ONLY be use on Inputs
4k and 5200: Pullups and pulldowns, can be used with I, O, I/O. Just place on
2 5200: Same to 4k, can be use on I, O, I/O for both pullup and pulldown.