vtr_flow/scripts/arch_gen/complexblocks/22nm/io.xml

<pb_type name="io" capacity="8" area="0">
  <input name="outpad" num_pins="1"/>
  <output name="inpad" num_pins="1"/>
  <clock name="clock" num_pins="1"/>

  <!-- IOs can operate as either inputs or outputs.
	     Delays below come from Ian Kuon. They are small, so they should be interpreted as
	     the delays to and from registers in the I/O (and generally I/Os are registered 
	     today and that is when you timing analyze them.
	     -->
  <mode name="inpad">
    <pb_type name="inpad" blif_model=".input" num_pb="1">
      <output name="inpad" num_pins="1"/>
    </pb_type>
    <interconnect>
      <direct name="inpad" input="inpad.inpad" output="io.inpad">
        <delay_constant max="4.243e-11" in_port="inpad.inpad" out_port="io.inpad"/>
      </direct>
    </interconnect>

  </mode>
  <mode name="outpad">
    <pb_type name="outpad" blif_model=".output" num_pb="1">
      <input name="outpad" num_pins="1"/>
    </pb_type>
    <interconnect>
      <direct name="outpad" input="io.outpad" output="outpad.outpad">
        <delay_constant max="1.394e-11" in_port="io.outpad" out_port="outpad.outpad"/>
      </direct>
    </interconnect>
  </mode>

  <!-- Every input pin is driven by 15% of the tracks in a channel, every output pin is driven by 10% of the tracks in a channel -->
  <fc in_type="frac" in_val="0.15" out_type="frac" out_val="0.10"/>

  <!-- IOs go on the periphery of the FPGA, for consistency, 
          make it physically equivalent on all sides so that only one definition of I/Os is needed.
          If I do not make a physically equivalent definition, then I need to define 4 different I/Os, one for each side of the FPGA
        -->
  <pinlocations pattern="custom">
    <loc side="left">io.outpad io.inpad io.clock</loc>
    <loc side="top">io.outpad io.inpad io.clock</loc>
    <loc side="right">io.outpad io.inpad io.clock</loc>
    <loc side="bottom">io.outpad io.inpad io.clock</loc>
  </pinlocations>

  <!-- Place I/Os on the sides of the FPGA -->
  <gridlocations>
    <loc type="perimeter" priority="10"/>
  </gridlocations>

  <power method="ignore"/>			
</pb_type>