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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.std_logic_1164.ALL;
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USE ieee.numeric_std.ALL;
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LIBRARY lpp;
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USE lpp.general_purpose.ALL;
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USE lpp.window_function_pkg.ALL;
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ENTITY window_function IS
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GENERIC (
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DATA_SIZE : INTEGER := 16;
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PARAM_SIZE : INTEGER := 10
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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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restart_window : IN STD_LOGIC;
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data_in : IN STD_LOGIC_VECTOR(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(DATA_SIZE-1 DOWNTO 0);
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data_out_valid : OUT STD_LOGIC
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);
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END window_function;
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ARCHITECTURE beh OF window_function IS
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SUBTYPE RANGE_NB_BIT_BY_WINDOW_PARAM IS INTEGER RANGE 1 TO DATA_SIZE;
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CONSTANT NB_BIT_BY_WINDOW_PARAM : RANGE_NB_BIT_BY_WINDOW_PARAM := 16;
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CONSTANT NB_POINT_BY_WINDOW : INTEGER := 256;
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TYPE WINDOWS_PARAM_TYPE IS ARRAY (INTEGER RANGE <>) OF STD_LOGIC_VECTOR(15 DOWNTO 0);
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CONSTANT windows_param_lfr_sigmoide : WINDOWS_PARAM_TYPE(0 TO 32) :=
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( X"0000",X"0012",X"002E",X"005B", X"00A2",X"0113",X"01C7",X"02E0", --0 - 7
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X"0498",X"073A",X"0B37",X"110D", X"193C",X"240F",X"3147",X"3FF7", --8 - 15
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X"4EA7",X"5BDF",X"66B2",X"6EE1", X"74B7",X"78B4",X"7B56",X"7D0E", --16 - 23
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X"7E27",X"7EDB",X"7F4C",X"7F93", X"7FC0",X"7FDC",X"7FEE",X"7FF9", --24 - 31
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X"7FFF" ); --32
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CONSTANT windows_param_lfr_rampe : WINDOWS_PARAM_TYPE(0 TO 32) :=
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( X"0000",X"03E1",X"07C2",X"0BA3", X"0F84",X"1365",X"1746",X"1B27",
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X"1F08",X"22E8",X"26C9",X"2AAA", X"2E8B",X"326C",X"364D",X"3A2E",
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X"3E0F",X"41F0",X"45D1",X"49B2", X"4D93",X"5174",X"5555",X"5936",
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X"5D17",X"60F7",X"64D8",X"68B9", X"6C9A",X"707B",X"745C",X"783D",
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X"7FFF" );
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CONSTANT windows_param_lfr_echelon : WINDOWS_PARAM_TYPE(0 TO 32) :=
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( X"0000",X"0000",X"0000",X"0000", X"0000",X"0000",X"0000",X"0000",
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X"0000",X"0000",X"0000",X"0000", X"0000",X"0000",X"0000",X"0000",
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X"FFFF",X"FFFF",X"FFFF",X"FFFF", X"FFFF",X"FFFF",X"FFFF",X"FFFF",
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X"FFFF",X"FFFF",X"FFFF",X"FFFF", X"FFFF",X"FFFF",X"FFFF",X"FFFF",
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X"FFFF");
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CONSTANT windows_param_lfr : WINDOWS_PARAM_TYPE(0 TO 32) := windows_param_lfr_sigmoide;
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SIGNAL windows_param : WINDOWS_PARAM_TYPE(0 TO NB_POINT_BY_WINDOW-1);
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SIGNAL param_counter : INTEGER RANGE 0 TO NB_POINT_BY_WINDOW-1;
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SIGNAL data_x_param : STD_LOGIC_VECTOR(DATA_SIZE + PARAM_SIZE - 1 DOWNTO 0);
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SIGNAL windows_param_selected_s : STD_LOGIC_VECTOR(15 DOWNTO 0);
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SIGNAL windows_param_selected : STD_LOGIC_VECTOR(PARAM_SIZE-1 DOWNTO 0);
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SIGNAL data_in_valid_s : STD_LOGIC;
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SIGNAL data_in_s : STD_LOGIC_VECTOR(DATA_SIZE-1 DOWNTO 0);
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BEGIN
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all_windows_param_0: FOR I IN 0 TO 31 GENERATE
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windows_param(I) <= windows_param_lfr(I);
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END GENERATE all_windows_param_0;
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all_windows_param_1: FOR I IN 32 TO 223 GENERATE
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windows_param(I) <= windows_param_lfr(32);
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END GENERATE all_windows_param_1;
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all_windows_param_2: FOR I IN 224 TO 255 GENERATE
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windows_param(I) <= windows_param_lfr(255-I);
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END GENERATE all_windows_param_2;
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PROCESS (clk, rstn)
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BEGIN -- PROCESS
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IF rstn = '0' THEN -- asynchronous reset (active low)
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param_counter <= 0;
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ELSIF clk'EVENT AND clk = '1' THEN -- rising clock edge
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IF restart_window = '1' THEN
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param_counter <= 0;
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ELSE
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IF data_in_valid = '1' THEN
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IF param_counter < 255 THEN
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param_counter <= param_counter + 1;
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ELSE
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param_counter <= 0;
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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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END PROCESS;
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data_in_valid_s <= data_in_valid;
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data_in_s <= data_in;
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windows_param_selected_s <= windows_param(param_counter);
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windows_param_selected <= windows_param_selected_s(15 DOWNTO 16 - PARAM_SIZE);
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WINDOWS_Multiplier : Multiplier
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GENERIC MAP (
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Input_SZ_A => DATA_SIZE,
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Input_SZ_B => PARAM_SIZE)
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PORT MAP (
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clk => clk,
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reset => rstn,
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mult => data_in_valid_s,
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OP1 => data_in_s,
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OP2 => windows_param_selected,
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RES => data_x_param);
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data_out <= data_x_param(DATA_SIZE + PARAM_SIZE-1 DOWNTO PARAM_SIZE);
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PROCESS (clk, rstn)
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BEGIN -- PROCESS
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IF rstn = '0' THEN -- asynchronous reset (active low)
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data_out_valid <= '0';
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ELSIF clk'EVENT AND clk = '1' THEN -- rising clock edge
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data_out_valid <= data_in_valid_s;
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END IF;
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END PROCESS;
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END beh;
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