Description
No, you cannot place the LVDS I/O standard input pin into 3V I/O banks even when powered by VCCPT. You will receive the following error message:
Error (14566): The Fitter cannot place <number of failed cells> periphery component(s) due to conflicts with existing constraints <failed cell summary> if you place the LVDS I/O standard into 3V I/O banks.
Resolution
There is no workaround for this problem.