Subversion Repositories adaptive_lms_equalizer

--  Copyright (C) 2004-2005 Digish Pandya <digish.pandya@gmail.com>

--  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; either version 2 of the License, or

--  (at your option) any later version.

--

--  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.

--

--  You should have received a copy of the GNU General Public License

--  along with this program; if not, write to the Free Software

--  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

-- A.9 saturation.vhd

-- saturation circuit

-- important for avoiding adverse effect of truncation

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity saturation is

    Port ( d_in : in std_logic_vector(15 downto 0);

           d_out : out std_logic_vector(15 downto 0));

end saturation;

architecture Behavioral of saturation is

        signal sel:std_logic_vector(1 downto 0);

begin

                sel(1) <= not(d_in(12) xor d_in(13)xor d_in(14) xor d_in(15));

                sel(0) <= d_in(15);

                with sel select

                d_out <= d_in when "11"|"10",

                            "0001000000000000" when "00",

                            "1111000000000000" when "01",

                            "0000000000000000" when others;

end Behavioral;