For Zynq 7000 and 7 series devices, the transceiver wrapper file directly instantiates device-specific transceiver wrapper files created from the serial transceiver wizard. These files tie off (or leave unconnected) unused I/O for the transceiver and apply the 1000BASE-X or 2500BASE-X attributes. The files can be edited/tailored by re-running the wizard (see Regeneration of 7 Series/Zynq 7000 Transceiver Files) and swapping these files.