<models xmlns:xi="http://www.w3.org/2001/XInclude">
  <model name="OBUFTDS_S_VPR">
    <input_ports>
      <port name="IB" combinational_sink_ports="OB"/>
    </input_ports>
    <output_ports>
      <port name="OB"/>
    </output_ports>
  </model>
  <model name="IOBUFDS_S_VPR">
    <input_ports>
      <port name="IB" combinational_sink_ports="IOPAD_$out"/>
      <port name="IOPAD_$inp" combinational_sink_ports="OB"/>
    </input_ports>
    <output_ports>
      <port name="OB"/>
      <port name="IOPAD_$out"/>
    </output_ports>
  </model>
</models>