[doc] update doc with the new xml syntax
@@ -22,6 +22,25 @@ Each ``<pb_type>`` should contain a ``<mode>`` that describes the physical imple
.. note:: Once a mode is disabled in packing, its child modes will be disabled as well.
+.. note:: The following syntax is only available in OpenFPGA!
+
+We allow more flexible pin location assignment when a ``<tile>`` has a capacity > 1.
+User can specify the location using the index of instance, e.g.,
+
+.. code-block:: xml
+
+ <tile name="io_bottom" capacity="6" area="0">
+ <equivalent_sites>
+ <site pb_type="io"/>
+ </equivalent_sites>
+ <input name="outpad" num_pins="1"/>
+ <output name="inpad" num_pins="1"/>
+ <fc in_type="frac" in_val="0.15" out_type="frac" out_val="0.10"/>
+ <pinlocations pattern="custom">
+ <loc side="top">io_bottom[0:1].outpad io_bottom[0:3].inpad io_bottom[2:5].outpad io_bottom[4:5].inpad</loc>
+ </pinlocations>
+ </tile>
+
Layout
~~~~~~
