diff --git a/debug/hw-debug.ads b/debug/hw-debug.ads
new file mode 100644
index 0000000..fd8ce9c
--- /dev/null
+++ b/debug/hw-debug.ads
@@ -0,0 +1,42 @@
+--
+-- Copyright (C) 2015 secunet Security Networks AG
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; version 2 of the License.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+
+package HW.Debug is
+
+   procedure Put (Item : String);
+   procedure Put_Line (Item : String);
+   procedure New_Line;
+
+   procedure Put_Word8 (Item : Word8);
+   procedure Put_Word16 (Item : Word16);
+   procedure Put_Word32 (Item : Word32);
+   procedure Put_Word64 (Item : Word64);
+
+   procedure Put_Int8 (Item : Int8);
+   procedure Put_Int16 (Item : Int16);
+   procedure Put_Int32 (Item : Int32);
+   procedure Put_Int64 (Item : Int64);
+
+   procedure Put_Reg8 (Name : String; Item : Word8);
+   procedure Put_Reg16 (Name : String; Item : Word16);
+   procedure Put_Reg32 (Name : String; Item : Word32);
+   procedure Put_Reg64 (Name : String; Item : Word64);
+
+   procedure Put_Buffer (Name : String; Buf : in Buffer; Len : in Buffer_Range);
+
+   procedure Set_Register_Write_Delay (Value : Word64);
+   Procedure Register_Write_Wait;
+end HW.Debug;
+
+--  vim: set ts=8 sts=3 sw=3 et: