<!-- set: ai sw=2 ts=2 sta et -->
<architecture>
  <models>
    <model name="DFF">
      <input_ports>
        <port is_clock="1" name="clk"/>
        <port clock="clk" name="data"/>
      </input_ports>
      <output_ports>
        <port clock="clk" name="out"/>
      </output_ports>
    </model>
  </models>
  <tiles>
    <tile name="ff_tile">
      <equivalent_sites>
        <site pb_type="ff_tile"/>
      </equivalent_sites>
      <input name="in" num_pins="4"/>
      <output name="out" num_pins="4"/>
      <clock name="clk" num_pins="1"/>
      <input name="cen" num_pins="1"/>
      <switchblock_locations pattern="all"/>
      <fc in_type="frac" in_val="1.0" out_type="frac" out_val="1.0"/>
      <pinlocations pattern="custom">
        <loc side="left" xoffset="0" yoffset="0">ff_tile.in</loc>
        <loc side="bottom" xoffset="0" yoffset="0">ff_tile.clk ff_tile.cen</loc>
        <loc side="right" xoffset="0" yoffset="0">ff_tile.out</loc>
      </pinlocations>
    </tile>
    <tile name="io_tile">
      <equivalent_sites>
        <site pb_type="io_tile"/>
      </equivalent_sites>
      <input name="in" num_pins="1"/>
      <output name="out" num_pins="1"/>
      <pinlocations pattern="custom">
        <loc side="top" xoffset="0" yoffset="0">io_tile.in io_tile.out</loc>
        <loc side="left" xoffset="0" yoffset="0">io_tile.in io_tile.out</loc>
        <loc side="bottom" xoffset="0" yoffset="0">io_tile.in io_tile.out</loc>
        <loc side="right" xoffset="0" yoffset="0">io_tile.in io_tile.out</loc>
      </pinlocations>
      <fc in_type="frac" in_val="1.0" out_type="frac" out_val="1.0"/>
    </tile>
  </tiles>
  <complexblocklist>
    <pb_type name="ff_tile">
      <input name="in" num_pins="4"/>
      <output name="out" num_pins="4"/>
      <!-- D flip-flop controls -->
      <clock name="clk" num_pins="1"/>
      <input name="cen" num_pins="1"/>
      <pb_type name="flipflop" num_pb="4">
        <clock name="posclk" num_pins="1"/>
        <clock name="negclk" num_pins="1"/>
        <input name="cen" num_pins="1"/>
        <input name="data" num_pins="1"/>
        <output name="out" num_pins="1"/>
        <mode name="DFF">
          <pb_type blif_model=".subckt DFF" name="DFF" num_pb="1">
            <clock name="clk" num_pins="1"/>
            <input name="data" num_pins="1"/>
            <output name="out" num_pins="1"/>
            <T_setup clock="clk" port="DFF.data" value="10e-12"/>
            <T_clock_to_Q clock="clk" max="10e-12" port="DFF.out"/>
          </pb_type>
          <interconnect>
            <direct input="flipflop.posclk" name="clk" output="DFF.clk"/>
            <direct input="flipflop.data" name="data" output="DFF.data"/>
            <direct input="DFF.out" name="out" output="flipflop.out"/>
          </interconnect>
        </mode>
      </pb_type>
      <pb_type name="clkinv" num_pb="1">
        <clock name="clk" num_pins="1"/>
        <output name="posclk" num_pins="1"/>
        <output name="negclk" num_pins="1"/>
        <mode name="straight">
          <pb_type name="clkinv-pos" num_pb="1">
            <clock name="in" num_pins="1"/>
            <output name="out" num_pins="1"/>
            <interconnect>
              <direct input="clkinv-pos.in" name="_" output="clkinv-pos.out"/>
            </interconnect>
          </pb_type>
          <interconnect>
            <direct input="clkinv.clk" name="in" output="clkinv-pos.in"/>
            <direct input="clkinv-pos.out" name="out" output="clkinv.posclk"/>
          </interconnect>
        </mode>
        <mode name="invert">
          <pb_type name="clkinv-neg" num_pb="1">
            <clock name="in" num_pins="1"/>
            <output name="out" num_pins="1"/>
            <interconnect>
              <direct input="clkinv-neg.in" name="_" output="clkinv-neg.out"/>
            </interconnect>
          </pb_type>
          <interconnect>
            <direct input="clkinv.clk" name="in" output="clkinv-neg.in"/>
            <direct input="clkinv-neg.out" name="out" output="clkinv.negclk"/>
          </interconnect>
        </mode>
      </pb_type>
      <interconnect>
        <direct input="ff_tile.in[0]" name="in[0]" output="flipflop[0].data"/>
        <direct input="ff_tile.in[1]" name="in[1]" output="flipflop[1].data"/>
        <direct input="ff_tile.in[2]" name="in[2]" output="flipflop[2].data"/>
        <direct input="ff_tile.in[3]" name="in[3]" output="flipflop[3].data"/>
        <direct input="flipflop[0].out" name="out[0]" output="ff_tile.out[0]"/>
        <direct input="flipflop[1].out" name="out[1]" output="ff_tile.out[1]"/>
        <direct input="flipflop[2].out" name="out[2]" output="ff_tile.out[2]"/>
        <direct input="flipflop[3].out" name="out[3]" output="ff_tile.out[3]"/>
        <!-- clock is shared but goes through the inverter first -->
        <direct input="ff_tile.clk" name="clk" output="clkinv.clk"/>
        <direct input="clkinv.posclk" name="posclk[0]" output="flipflop[0].posclk"/>
        <direct input="clkinv.posclk" name="posclk[1]" output="flipflop[1].posclk"/>
        <direct input="clkinv.posclk" name="posclk[2]" output="flipflop[2].posclk"/>
        <direct input="clkinv.posclk" name="posclk[3]" output="flipflop[3].posclk"/>
        <direct input="clkinv.negclk" name="negclk[0]" output="flipflop[0].negclk"/>
        <direct input="clkinv.negclk" name="negclk[1]" output="flipflop[1].negclk"/>
        <direct input="clkinv.negclk" name="negclk[2]" output="flipflop[2].negclk"/>
        <direct input="clkinv.negclk" name="negclk[3]" output="flipflop[3].negclk"/>
        <!-- clock enable is shared -->
        <direct input="ff_tile.cen" name="cen[0]" output="flipflop[0].cen"/>
        <direct input="ff_tile.cen" name="cen[1]" output="flipflop[1].cen"/>
        <direct input="ff_tile.cen" name="cen[2]" output="flipflop[2].cen"/>
        <direct input="ff_tile.cen" name="cen[3]" output="flipflop[3].cen"/>
      </interconnect>
    </pb_type>
    <pb_type name="io_tile">
      <input name="in" num_pins="1"/>
      <output name="out" num_pins="1"/>
      <mode name="OUTPUT">
        <pb_type blif_model=".output" name="pad" num_pb="1">
          <input name="outpad" num_pins="1"/>
        </pb_type>
        <interconnect>
          <direct input="io_tile.in" name="-" output="pad.outpad"/>
        </interconnect>
      </mode>
      <mode name="INPUT">
        <pb_type blif_model=".input" name="pad" num_pb="1">
          <output name="inpad" num_pins="1"/>
        </pb_type>
        <interconnect>
          <direct input="pad.inpad" name="-" output="io_tile.out"/>
        </interconnect>
      </mode>
    </pb_type>
  </complexblocklist>
  <layout>
    <auto_layout>
      <fill type="ff_tile" priority="1"/>
      <perimeter type="io_tile" priority="2"/>
      <corners type="EMPTY" priority="3"/>
    </auto_layout>
  </layout>
  <device>
    <sizing R_minW_nmos="6065.520020" R_minW_pmos="18138.500000"/>
    <area grid_logic_tile_area="14813.392"/>
    <connection_block input_switch_name="sw"/>
    <switch_block fs="3" type="universal"/>
    <chan_width_distr>
      <x distr="uniform" peak="1.000000"/>
      <y distr="uniform" peak="1.000000"/>
    </chan_width_distr>
  </device>
  <switchlist>
    <switch Cin=".77e-15" Cout="4e-15" R="1" Tdel="58e-12" buf_size="27.645901" mux_trans_size="2.630740" name="sw" type="mux"/>
  </switchlist>
  <segmentlist>
    <segment Cmetal="22.5e-15" Rmetal="101" freq="1.0" name="wire" type="bidir" length="1">
      <wire_switch name="sw"/>
      <opin_switch name="sw"/>
      <sb type="pattern">1 1</sb>
      <cb type="pattern">1</cb>
    </segment>
  </segmentlist>
</architecture>