What stands out to me is you have two different IOSTANDARDs specified. It looks like you are using a Mojo since you have a UCF file. The Mojo can’t do LVCMOS18 as all the IO ports are powered with 3.3V.
What stands out to me is you have two different IOSTANDARDs specified. It looks like you are using a Mojo since you have a UCF file. The Mojo can’t do LVCMOS18 as all the IO ports are powered with 3.3V.