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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 : Jean-christophe Pellion
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-- Mail : jean-christophe.pellion@lpp.polytechnique.fr
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-- jean-christophe.pellion@easii-ic.com
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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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ENTITY cic_comb IS
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GENERIC (
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b_data_size : INTEGER := 16;
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D_delay_number : INTEGER := 2
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);
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PORT (
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clk : IN STD_LOGIC;
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rstn : IN STD_LOGIC;
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run : IN STD_LOGIC;
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data_in : IN STD_LOGIC_VECTOR(b_data_size-1 DOWNTO 0);
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data_in_valid : IN STD_LOGIC;
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data_out : OUT STD_LOGIC_VECTOR(b_data_size-1 DOWNTO 0);
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data_out_valid : OUT STD_LOGIC
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);
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END cic_comb;
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ARCHITECTURE beh OF cic_comb IS
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TYPE data_vector IS ARRAY (NATURAL RANGE <>) OF STD_LOGIC_VECTOR(b_data_size - 1 DOWNTO 0);
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SIGNAL data_reg : data_vector(D_delay_number DOWNTO 0);
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BEGIN -- beh
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data_reg(0) <= data_in;
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all_D: FOR I IN D_delay_number DOWNTO 1 GENERATE
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PROCESS (clk, rstn)
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BEGIN
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IF rstn = '0' THEN
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data_reg(I) <= (OTHERS => '0');
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ELSIF clk'event AND clk = '1' THEN
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IF run = '0' THEN
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data_reg(I) <= (OTHERS => '0');
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ELSIF data_in_valid = '1' THEN
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data_reg(I) <= data_reg(I-1);
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END IF;
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END IF;
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END PROCESS;
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END GENERATE all_D;
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PROCESS (clk, rstn)
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BEGIN
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IF rstn = '0' THEN
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data_out <= (OTHERS => '0');
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data_out_valid <= '0';
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ELSIF clk'event AND clk = '1' THEN
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IF run = '0' THEN
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data_out <= (OTHERS => '0');
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data_out_valid <= '0';
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ELSE
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data_out_valid <= data_in_valid;
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IF data_in_valid = '1' THEN
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data_out <= STD_LOGIC_VECTOR(resize(SIGNED(data_reg(0))-SIGNED(data_reg(D_delay_number)),b_data_size));
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END IF;
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END IF;
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END IF;
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END PROCESS;
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END beh;
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