diff --git a/projects/ad9434_fmc/common/ad9434_spi.v b/projects/ad9434_fmc/common/ad9434_spi.v
index 9dc389009..f4d5869a2 100644
--- a/projects/ad9434_fmc/common/ad9434_spi.v
+++ b/projects/ad9434_fmc/common/ad9434_spi.v
@@ -82,12 +82,12 @@ module ad9434_spi (
     end
   end
 
-  // io butter
-
-  IOBUF i_iobuf_sdio (
-    .T (spi_enable_s),
-    .I (spi_mosi),
-    .O (spi_miso),
-    .IO (spi_sdio));
+  // io buffer
+  
+  ad_iobuf #(.DATA_WIDTH(1)) i_iobuf_sdio (
+    .dio_t (spi_enable_s),
+    .dio_i (spi_mosi),
+    .dio_o (spi_miso),
+    .dio_p (spi_sdio));
 
 endmodule
diff --git a/projects/ad9467_fmc/common/ad9467_spi.v b/projects/ad9467_fmc/common/ad9467_spi.v
index c34045932..903b21e27 100644
--- a/projects/ad9467_fmc/common/ad9467_spi.v
+++ b/projects/ad9467_fmc/common/ad9467_spi.v
@@ -82,13 +82,13 @@ module ad9467_spi (
     end
   end
 
-  // io butter
+  // io buffer
 
-  IOBUF i_iobuf_sdio (
-    .T (spi_enable_s),
-    .I (spi_mosi),
-    .O (spi_miso),
-    .IO (spi_sdio));
+  ad_iobuf #(.DATA_WIDTH(1)) i_iobuf_sdio (
+    .dio_t (spi_enable_s),
+    .dio_i (spi_mosi),
+    .dio_o (spi_miso),
+    .dio_p (spi_sdio));
 
 endmodule
 
diff --git a/projects/fmcadc5/common/fmcadc5_spi.v b/projects/fmcadc5/common/fmcadc5_spi.v
index 3c3deec60..c9fae65c1 100644
--- a/projects/fmcadc5/common/fmcadc5_spi.v
+++ b/projects/fmcadc5/common/fmcadc5_spi.v
@@ -85,13 +85,13 @@ module fmcadc5_spi (
     end
   end
 
-  // io butter
+  // io buffer
 
-  IOBUF i_iobuf_sdio (
-    .T (spi_enable_s),
-    .I (spi_mosi),
-    .O (spi_miso),
-    .IO (spi_sdio));
+  ad_iobuf #(.DATA_WIDTH(1)) i_iobuf_sdio (
+    .dio_t (spi_enable_s),
+    .dio_i (spi_mosi),
+    .dio_o (spi_miso),
+    .dio_p (spi_sdio));
 
 endmodule