diff --git a/projects/imageon/zc706/system_top.v b/projects/imageon/zc706/system_top.v
index 7fc0062bc..9b45c023a 100644
--- a/projects/imageon/zc706/system_top.v
+++ b/projects/imageon/zc706/system_top.v
@@ -133,7 +133,7 @@ module system_top (
   output  [15:0]  hdmi_tx_data;
   output          hdmi_tx_spdif;
 
-  output          hdmi_iic_rstn;
+  inout           hdmi_iic_rstn;
   inout           hdmi_iic_scl;
   inout           hdmi_iic_sda;
 
@@ -145,7 +145,6 @@ module system_top (
 
   // base hdmi
 
-  assign hdmi_iic_rstn = 1'b1;
   assign hdmi_out_clk = 1'd0;
   assign hdmi_vsync = 1'd0;
   assign hdmi_hsync = 1'd0;
@@ -155,6 +154,12 @@ module system_top (
 
   // instantiations
 
+  ad_iobuf #(.DATA_WIDTH(1)) i_gpio_hdmi_iic_rstn (
+    .dio_t (gpio_t[33]),
+    .dio_i (gpio_o[33]),
+    .dio_o (gpio_i[33]),
+    .dio_p (hdmi_iic_rstn));
+
   ad_iobuf #(.DATA_WIDTH(1)) i_gpio_hdmi (
     .dio_t (gpio_t[32]),
     .dio_i (gpio_o[32]),
diff --git a/projects/imageon/zed/system_top.v b/projects/imageon/zed/system_top.v
index b93a6962b..80b6e87b0 100644
--- a/projects/imageon/zed/system_top.v
+++ b/projects/imageon/zed/system_top.v
@@ -152,7 +152,7 @@ module system_top (
   output  [15:0]  hdmi_tx_data;
   output          hdmi_tx_spdif;
 
-  output          hdmi_iic_rstn;
+  inout           hdmi_iic_rstn;
   inout           hdmi_iic_scl;
   inout           hdmi_iic_sda;
 
@@ -172,7 +172,6 @@ module system_top (
 
   // base hdmi
 
-  assign hdmi_iic_rstn = 1'b1;
   assign hdmi_out_clk = 1'd0;
   assign hdmi_vsync = 1'd0;
   assign hdmi_hsync = 1'd0;
@@ -182,6 +181,12 @@ module system_top (
 
   // instantiations
 
+  ad_iobuf #(.DATA_WIDTH(1)) i_gpio_hdmi_iic_rstn (
+    .dio_t (gpio_t[33]),
+    .dio_i (gpio_o[33]),
+    .dio_o (gpio_i[33]),
+    .dio_p (hdmi_iic_rstn));
+
   ad_iobuf #(.DATA_WIDTH(1)) i_gpio_hdmi (
     .dio_t (gpio_t[32]),
     .dio_i (gpio_o[32]),