tests/vtr/full-adder/golden.model.xml

<models xmlns:xi="http://www.w3.org/2001/XInclude">
  <!-- https://docs.verilogtorouting.org/en/latest/tutorials/arch/timing_modeling/#sequential-block-no-internal-paths -->
  <model name="ADDER">
    <input_ports>
      <port name="a" combinational_sink_ports="cout sum"/>
      <port name="b" combinational_sink_ports="cout sum"/>
      <port name="cin" combinational_sink_ports="cout sum"/>
    </input_ports>
    <output_ports>
      <port name="cout"/>
      <port name="sum"/>
    </output_ports>
  </model>
</models>