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------------------------------------------------------------------------------
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-- This file is a part of the LPP VHDL IP LIBRARY
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-- Copyright (C) 2009 - 2010, Laboratory of Plasmas Physic - CNRS
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Martin Morlot
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-- Mail : martin.morlot@lpp.polytechnique.fr
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-------------------------------------------------------------------------------
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library IEEE;
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use IEEE.numeric_std.all;
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use IEEE.std_logic_1164.all;
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--! Programme permetant de compl�menter ou non les entr�es de l'ALU, et ainsi de travailler avec des nombres n�gatifs
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entity TwoComplementer is
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generic(
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Input_SZ : integer := 16);
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port(
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clk : in std_logic; --! Horloge du composant
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reset : in std_logic; --! Reset general du composant
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clr : in std_logic; --! Un reset sp�cifique au programme
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TwoComp : in std_logic; --! Autorise l'utilisation du compl�ment
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OP : in std_logic_vector(Input_SZ-1 downto 0); --! Op�rande d'entr�e
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RES : out std_logic_vector(Input_SZ-1 downto 0) --! R�sultat, op�rande compl�ment� ou non
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);
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end TwoComplementer;
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architecture ar_TwoComplementer of TwoComplementer is
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signal REG : std_logic_vector(Input_SZ-1 downto 0);
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signal OPinteger : integer;
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signal RESCOMP : std_logic_vector(Input_SZ-1 downto 0);
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begin
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RES <= REG;
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OPinteger <= to_integer(signed(OP));
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RESCOMP <= std_logic_vector(to_signed(-OPinteger,Input_SZ));
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process(clk,reset)
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begin
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if(reset='0')then
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REG <= (others => '0');
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elsif(clk'event and clk='1')then
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if(clr='1')then
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REG <= (others => '0');
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elsif(TwoComp='1')then
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REG <= RESCOMP;
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else
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REG <= OP;
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end if;
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end if;
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end process;
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end ar_TwoComplementer;
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