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--
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--
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-- Majority voting filter
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-- Majority voting filter
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--
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--
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-- Author: Sebastian Witt
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-- Author: Sebastian Witt
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-- Date: 27.01.2008
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-- Date: 27.01.2008
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-- Version: 1.0
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-- Version: 1.1
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--
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--
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-- This code is free software; you can redistribute it and/or
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-- This code is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU Lesser General Public
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-- modify it under the terms of the GNU Lesser General Public
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-- License as published by the Free Software Foundation; either
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-- License as published by the Free Software Foundation; either
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-- version 2.1 of the License, or (at your option) any later version.
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-- version 2.1 of the License, or (at your option) any later version.
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-- Boston, MA 02111-1307 USA
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-- Boston, MA 02111-1307 USA
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--
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--
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LIBRARY IEEE;
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LIBRARY IEEE;
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USE IEEE.std_logic_1164.all;
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USE IEEE.std_logic_1164.all;
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USE IEEE.std_logic_unsigned.all;
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USE IEEE.numeric_std.all;
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USE IEEE.numeric_std.all;
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entity slib_mv_filter is
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entity slib_mv_filter is
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generic (
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generic (
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end slib_mv_filter;
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end slib_mv_filter;
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architecture rtl of slib_mv_filter is
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architecture rtl of slib_mv_filter is
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-- Signals
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-- Signals
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signal iCounter : std_logic_vector(WIDTH downto 0); -- Sample counter
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signal iCounter : unsigned(WIDTH downto 0); -- Sample counter
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signal iQ : std_logic; -- Internal Q
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signal iQ : std_logic; -- Internal Q
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begin
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begin
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-- Main process
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-- Main process
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MV_PROC: process (RST, CLK)
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MV_PROC: process (RST, CLK)
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elsif (CLK'event and CLK='1') then
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elsif (CLK'event and CLK='1') then
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if (iCounter >= THRESHOLD) then -- Compare with threshold
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if (iCounter >= THRESHOLD) then -- Compare with threshold
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iQ <= '1';
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iQ <= '1';
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else
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else
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if (SAMPLE = '1' and D = '1') then -- Take sample
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if (SAMPLE = '1' and D = '1') then -- Take sample
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iCounter <= iCounter + '1';
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iCounter <= iCounter + 1;
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end if;
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end if;
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end if;
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end if;
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if (CLEAR = '1') then -- Reset logic
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if (CLEAR = '1') then -- Reset logic
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iCounter <= (others => '0');
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iCounter <= (others => '0');
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