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 69630c5e1..a605b7224 100644
--- a/openfpga_flow/vpr_arch/k4_N4_tileable_customIoLoc_40nm.xml
+++ b/openfpga_flow/vpr_arch/k4_N4_tileable_customIoLoc_40nm.xml
@@ -63,20 +63,6 @@
         <loc side="left">io_bottom[4:5].outpad io_bottom[4:5].inpad</loc>
       </pinlocations>
     </tile>
-    <tile name="io_left" capacity="4" 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_left[1:1].inpad io_left[1:1].outpad</loc>
-        <loc side="right">io_left[0:0].inpad io_left[0:0].outpad</loc>
-        <loc side="bottom">io_left[2:2].inpad io_left[2:2].outpad</loc>
-        <loc side="left">io_left[3:3].inpad io_left[3:3].outpad</loc>
-      </pinlocations>
-    </tile>
     <tile name="io_right" capacity="2" area="0">
       <equivalent_sites>
         <site pb_type="io"/>
@@ -106,10 +92,11 @@
   <!-- Physical descriptions begin -->
   <layout tileable="true">
     <auto_layout aspect_ratio="1.0">
-      <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
+      <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring
+        Intend to have no I/Os on the left side, it is to check the correctness of I/O indexing in OpenFPGA
+        -->
       <row type="io_top" starty="H-2" priority="90"/>
       <row type="io_bottom" starty="1" priority="91"/>
-      <col type="io_left" startx="1" priority="92"/>
       <col type="io_right" startx="W-2" priority="93"/>
       <row type="EMPTY" starty="H-1" priority="101"/>
       <row type="EMPTY" starty="0" priority="102"/>
@@ -123,7 +110,6 @@
       <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
       <row type="io_top" starty="H-2" priority="90"/>
       <row type="io_bottom" starty="1" priority="91"/>
-      <col type="io_left" startx="1" priority="92"/>
       <col type="io_right" startx="W-2" priority="93"/>
       <row type="EMPTY" starty="H-1" priority="101"/>
       <row type="EMPTY" starty="0" priority="102"/>
@@ -137,7 +123,6 @@
       <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
       <row type="io_top" starty="H-2" priority="90"/>
       <row type="io_bottom" starty="1" priority="91"/>
-      <col type="io_left" startx="1" priority="92"/>
       <col type="io_right" startx="W-2" priority="93"/>
       <row type="EMPTY" starty="H-1" priority="101"/>
       <row type="EMPTY" starty="0" priority="102"/>
@@ -151,7 +136,6 @@
       <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
       <row type="io_top" starty="H-2" priority="90"/>
       <row type="io_bottom" starty="1" priority="91"/>
-      <col type="io_left" startx="1" priority="92"/>
       <col type="io_right" startx="W-2" priority="93"/>
       <row type="EMPTY" starty="H-1" priority="101"/>
       <row type="EMPTY" starty="0" priority="102"/>
@@ -165,7 +149,6 @@
       <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
       <row type="io_top" starty="H-2" priority="90"/>
       <row type="io_bottom" starty="1" priority="91"/>
-      <col type="io_left" startx="1" priority="92"/>
       <col type="io_right" startx="W-2" priority="93"/>
       <row type="EMPTY" starty="H-1" priority="101"/>
       <row type="EMPTY" starty="0" priority="102"/>
@@ -179,7 +162,6 @@
       <!--Perimeter of 'EMPTY' blocks, I/Os are placed on the inner ring -->
       <row type="io_top" starty="H-2" priority="90"/>
       <row type="io_bottom" starty="1" priority="91"/>
-      <col type="io_left" startx="1" priority="92"/>
       <col type="io_right" startx="W-2" priority="93"/>
       <row type="EMPTY" starty="H-1" priority="101"/>
       <row type="EMPTY" starty="0" priority="102"/>