diff --git a/openfpga_flow/vpr_arch/k4_N4_tileable_customIoLoc_40nm.xml b/openfpga_flow/vpr_arch/k4_N4_tileable_customIoLoc_40nm.xml
index a605b7224..0c022cb87 100644
--- a/openfpga_flow/vpr_arch/k4_N4_tileable_customIoLoc_40nm.xml
+++ b/openfpga_flow/vpr_arch/k4_N4_tileable_customIoLoc_40nm.xml
@@ -132,6 +132,48 @@
       <!--Fill with 'clb'-->
       <fill type="clb" priority="10"/>
     </fixed_layout>
+    <fixed_layout name="4x4_io_center" width="6" height="6">
+      <!--Perimeter of 'clb' blocks, I/Os are placed in the center-->
+      <row type="clb" starty="H-2" priority="90"/>
+      <row type="clb" starty="1" priority="91"/>
+      <col type="clb" startx="W-2" priority="93"/>
+      <col type="clb" startx="1" priority="93"/>
+      <row type="EMPTY" starty="H-1" priority="101"/>
+      <row type="EMPTY" starty="0" priority="102"/>
+      <col type="EMPTY" startx="0" priority="103"/>
+      <col type="EMPTY" startx="W-1" priority="104"/>
+      <corners type="EMPTY" priority="101"/>
+      <!--Fill with 'clb'-->
+      <fill type="io_top" priority="10"/>
+    </fixed_layout>
+    <fixed_layout name="4x3_io_center" width="6" height="5">
+      <!--Perimeter of 'clb' blocks, I/Os are placed in the center-->
+      <row type="clb" starty="H-2" priority="90"/>
+      <row type="clb" starty="1" priority="91"/>
+      <col type="clb" startx="W-2" priority="93"/>
+      <col type="clb" startx="1" priority="93"/>
+      <row type="EMPTY" starty="H-1" priority="101"/>
+      <row type="EMPTY" starty="0" priority="102"/>
+      <col type="EMPTY" startx="0" priority="103"/>
+      <col type="EMPTY" startx="W-1" priority="104"/>
+      <corners type="EMPTY" priority="101"/>
+      <!--Fill with 'clb'-->
+      <fill type="io_top" priority="10"/>
+    </fixed_layout>
+    <fixed_layout name="3x4_io_center" width="5" height="6">
+      <!--Perimeter of 'clb' blocks, I/Os are placed in the center-->
+      <row type="clb" starty="H-2" priority="90"/>
+      <row type="clb" starty="1" priority="91"/>
+      <col type="clb" startx="W-2" priority="93"/>
+      <col type="clb" startx="1" priority="93"/>
+      <row type="EMPTY" starty="H-1" priority="101"/>
+      <row type="EMPTY" starty="0" priority="102"/>
+      <col type="EMPTY" startx="0" priority="103"/>
+      <col type="EMPTY" startx="W-1" priority="104"/>
+      <corners type="EMPTY" priority="101"/>
+      <!--Fill with 'clb'-->
+      <fill type="io_top" priority="10"/>
+    </fixed_layout>
     <fixed_layout name="48x48" width="50" height="50">
       <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
       <row type="io_top" starty="H-2" priority="90"/>