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[/] [adaptive_lms_equalizer/] [trunk/] [code/] [saturation.vhd] - Rev 6
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-- 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;
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