12-03-2016 07:40 AM
One does not drive an output. One drives an input.
Are you asking how to forward a clock? Look up "clock forwarding."
If you are asking how to use the IBUFDS, that is in the clocking resources users guide.
ug472 (for 7 series, look up the one for the device family you are using)
12-03-2016 07:44 AM
If this concerns a simple non-clock input,
That is covered in the IO Users Guide for the family of interest.
There is no internal tristate.
12-03-2016 08:07 PM
Refer IO resources user guide for 7-series at https://www.xilinx.com/support/documentation/user_guides/ug471_7Series_SelectIO.pdf for the usage and rules
Can you elaborate on your requirement?