lattice/ice40/primitives/sb_carry/sb_carry.model.xml

<!-- set: ai sw=1 ts=1 sta et -->
<models>
 <model name="SB_CARRY">
  <input_ports>
   <port name="I0" combinational_sink_ports="CO" /> <!-- I1 -->
   <port name="I1" combinational_sink_ports="CO" /> <!-- I2 -->
   <port name="CI" combinational_sink_ports="CO" /> <!-- FCIN -->
  </input_ports>
  <output_ports>
   <port name="CO" /> <!-- FCOUT -->
  </output_ports>
 </model>
</models>