Bidirectional pin USB_RX with a pseudo-differential I/O standard must use the OEIN port of the node

I am trying to make a bidirectional differential line using Cyclone V. In VHDL, I set USB_RX, USB_RXn as INOUT on the top level (they are assigned to a Differential SSTL-II 2.5 pair).  I used the AL...