diff --git a/src/deprecated/pad_functional.sv b/src/deprecated/pad_functional.sv
index 720b332..3765b87 100644
--- a/src/deprecated/pad_functional.sv
+++ b/src/deprecated/pad_functional.sv
@@ -79,4 +79,42 @@ module pad_functional_pu (
   bufif0 (PAD_wi, 1'b1, PEN);
   rpmos  (PAD, PAD_wi, 1'b0);
 
-endmodule
\ No newline at end of file
+endmodule
+
+module pad_functional (
+  input  logic OEN,
+  input  logic I,
+  output logic O,
+  input  logic PUEN,
+  input  logic PEN,
+  inout  wire  PAD
+);
+
+/*
+    X Unknown
+    Z Hi-Z
+    H Pull High
+    L Pull Low
+*/
+
+/*
+    OEN I   PAD PUEN PEN | PAD O
+                         |
+    0   0   -   0/1  0/1 | 0   0
+    0   1   -   0/1  0/1 | 1   1
+    1   0/1 0   0/1  0/1 | -   0
+    1   0/1 1   0/1  0/1 | -   1
+    1   0/1 Z    0   0   | H   H
+    1   0/1 Z    1   0   | L   L
+    1   0/1 Z   0/1  1   | -   X
+
+*/
+
+  wire   PAD_wi;
+
+  bufif0 (PAD, I, OEN);
+  buf    (O, PAD);
+  bufif0 (PAD_wi, ~PUEN, PEN);
+  rpmos  (PAD, PAD_wi, 1'b0);
+
+endmodule
diff --git a/src/fpga/pad_functional_xilinx.sv b/src/fpga/pad_functional_xilinx.sv
index 665c113..59b7cd1 100644
--- a/src/fpga/pad_functional_xilinx.sv
+++ b/src/fpga/pad_functional_xilinx.sv
@@ -20,7 +20,7 @@ module pad_functional_pd
 
   (* PULLDOWN = "YES" *)
   IOBUF iobuf_i (
-    .T ( OEN ),
+    .T ( OEN  ),
     .I ( I    ),
     .O ( O    ),
     .IO( PAD  )
@@ -39,7 +39,25 @@ module pad_functional_pu
 
   (* PULLUP = "YES" *)
   IOBUF iobuf_i (
-    .T ( OEN ),
+    .T ( OEN  ),
+    .I ( I    ),
+    .O ( O    ),
+    .IO( PAD  )
+  );
+
+endmodule
+
+module pad_functional
+(
+   input  logic             OEN,
+   input  logic             I,
+   output logic             O,
+   input  logic             PEN,
+   inout  logic             PAD
+);
+
+  IOBUF iobuf_i (
+    .T ( OEN  ),
     .I ( I    ),
     .O ( O    ),
     .IO( PAD  )