equivalent: fixed example architecture.xml in docs

Signed-off-by: Alessandro Comodi <[email protected]>

Author: acomodi

doc/src/arch/example_arch.xml

@@ -80,11 +80,7 @@
   <tiles>
     <tile name="io" capacity="8">
       <equivalent_sites>
-        <site pb_type="io">
-          <direct from="io.outpad" to="io.outpad"/>
-          <direct from="io.inpad" to="io.inpad"/>
-          <direct from="io.clock" to="io.clock"/>
-        </site>
+        <site pb_type="io" pin_mapping="direct"/>
       </equivalent_sites>
       <input name="outpad" num_pins="1"/>
       <output name="inpad" num_pins="1"/>
@@ -99,11 +95,7 @@
     </tile>
     <tile name="clb">
       <equivalent_sites>
-        <site pb_type="clb">
-          <direct from="clb.I" to="clb.I"/>
-          <direct from="clb.O" to="clb.O"/>
-          <direct from="clb.clk" to="clb.clk"/>
-        </site>
+        <site pb_type="clb" pin_mapping="direct"/>
       </equivalent_sites>
       <input name="I" num_pins="33" equivalent="full"/>
       <output name="O" num_pins="10" equivalent="instance"/>
@@ -113,11 +105,7 @@
     </tile>
     <tile name="mult_36" height="4">
       <equivalent_sites>
-        <site pb_type="mult_36">
-          <direct from="mult_36.a" to="mult_36.a"/>
-          <direct from="mult_36.b" to="mult_36.b"/>
-          <direct from="mult_36.out" to="mult_36.out"/>
-        </site>
+        <site pb_type="mult_36" pin_mapping="direct"/>
       </equivalent_sites>
       <input name="a" num_pins="36"/>
       <input name="b" num_pins="36"/>
@@ -126,15 +114,7 @@
     </tile>
     <tile name="memory" height="6">
       <equivalent_sites>
-        <site pb_type="memory">
-          <direct from="memory.addr1" to="memory.addr1"/>
-          <direct from="memory.addr2" to="memory.addr2"/>
-          <direct from="memory.data" to="memory.data"/>
-          <direct from="memory.we1" to="memory.we1"/>
-          <direct from="memory.we2" to="memory.we2"/>
-          <direct from="memory.out" to="memory.out"/>
-          <direct from="memory.clk" to="memory.clk"/>
-        </site>
+        <site pb_type="memory" pin_mapping="direct"/>
       </equivalent_sites>
       <input name="addr1" num_pins="17"/>
       <input name="addr2" num_pins="17"/>