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diff --git a/src/grt/grt-vcd.ads b/src/grt/grt-vcd.ads
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+--  GHDL Run Time (GRT) - VCD generator.
+--  Copyright (C) 2002 - 2014 Tristan Gingold
+--
+--  GHDL 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; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL 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.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+--
+--  As a special exception, if other files instantiate generics from this
+--  unit, or you link this unit with other files to produce an executable,
+--  this unit does not by itself cause the resulting executable to be
+--  covered by the GNU General Public License. This exception does not
+--  however invalidate any other reasons why the executable file might be
+--  covered by the GNU Public License.
+with System; use System;
+with Grt.Types; use Grt.Types;
+with Grt.Avhpi; use Grt.Avhpi;
+
+package Grt.Vcd is
+   --  Abstract type for IO.
+   type Vcd_Put_Acc is access procedure (Str : String);
+   type Vcd_Putc_Acc is access procedure (C : Character);
+   type Vcd_Close_Acc is access procedure;
+
+   Vcd_Put : Vcd_Put_Acc;
+   Vcd_Putc : Vcd_Putc_Acc;
+   Vcd_Close : Vcd_Close_Acc;
+
+   type Vcd_Var_Kind is (Vcd_Bad,
+                         Vcd_Bool,
+                         Vcd_Integer32,
+                         Vcd_Float64,
+                         Vcd_Bit, Vcd_Stdlogic,
+                         Vcd_Bitvector, Vcd_Stdlogic_Vector);
+
+   --  Which value to be displayed: effective or driving (for out signals).
+   type Vcd_Value_Kind is (Vcd_Effective, Vcd_Driving);
+
+   type Verilog_Wire_Info is record
+      Addr : Address;
+      Irange : Ghdl_Range_Ptr;
+      Kind : Vcd_Var_Kind;
+      Val : Vcd_Value_Kind;
+   end record;
+
+   procedure Get_Verilog_Wire (Sig : VhpiHandleT;
+                               Info : out Verilog_Wire_Info);
+
+   --  Return TRUE if last change time of the wire described by INFO is LAST.
+   function Verilog_Wire_Changed (Info : Verilog_Wire_Info;
+                                  Last : Std_Time)
+                                 return Boolean;
+
+   procedure Register;
+end Grt.Vcd;