<pb_type xmlns:xi="http://www.w3.org/2001/XInclude" name="ADDER" num_pb="1">
  <blif_model>.subckt adder</blif_model>
  <input name="a" num_pins="1"/>
  <input name="b" num_pins="1"/>
  <input name="cin" num_pins="1"/>
  <output name="cout" num_pins="1"/>
  <output name="sum" num_pins="1"/>
  <delay_constant max="300e-12" in_port="a" out_port="cout"/>
  <delay_constant max="300e-12" in_port="b" out_port="cout"/>
  <delay_constant max="10e-12" in_port="cin" out_port="cout"/>
  <delay_constant max="300e-12" in_port="a" out_port="sum"/>
  <delay_constant max="300e-12" in_port="b" out_port="sum"/>
  <delay_constant max="300e-12" in_port="cin" out_port="sum"/>
  <T_setup clock="clk" port="a" value="10e-12"/>
  <T_clock_to_Q clock="clk" max="10e-12" port="cout"/>
</pb_type>