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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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USE ieee.math_real.ALL;
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PACKAGE lpp_lfr_filter_coeff IS
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--REAL
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TYPE COEFF_CEL_REAL IS ARRAY (1 TO 6) OF REAL; -- b0, b1, b2, a0, a1, a2
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TYPE COEFF_CEL_ARRAY_REAL IS ARRAY (INTEGER RANGE <>) OF COEFF_CEL_REAL;
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--INTEGER
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TYPE COEFF_CEL_INTEGER IS ARRAY (1 TO 6) OF INTEGER; -- b0, b1, b2, a0, a1, a2
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TYPE COEFF_CEL_ARRAY_INTEGER IS ARRAY (INTEGER RANGE <>) OF COEFF_CEL_INTEGER;
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-----------------------------------------------------------------------------
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--
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-----------------------------------------------------------------------------
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FUNCTION get_IIR_CEL_FILTER_CONFIG (
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COEFFICIENT_SIZE , POINT_POSITION, CEL_NUMBER : INTEGER;
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SOS_array : COEFF_CEL_ARRAY_REAL;--(INTEGER RANGE <>);
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GAIN_array : COEFF_CEL_REAL
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) RETURN STD_LOGIC_VECTOR;
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END lpp_lfr_filter_coeff;
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PACKAGE BODY lpp_lfr_filter_coeff IS
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FUNCTION get_IIR_CEL_FILTER_CONFIG (
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COEFFICIENT_SIZE , POINT_POSITION, CEL_NUMBER : INTEGER;
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SOS_array : COEFF_CEL_ARRAY_REAL;--(INTEGER RANGE <>);
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GAIN_array : COEFF_CEL_REAL
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) RETURN STD_LOGIC_VECTOR IS
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VARIABLE config_vector : STD_LOGIC_VECTOR((CEL_NUMBER * 5 * COEFFICIENT_SIZE)-1 DOWNTO 0);
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VARIABLE SOS_with_gain_array : COEFF_CEL_ARRAY_REAL(1 TO CEL_NUMBER);
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VARIABLE SOS_with_gain_array_integer : COEFF_CEL_ARRAY_INTEGER(1 TO CEL_NUMBER);
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CONSTANT REAL_NEG : REAL := -1.0;
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BEGIN
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all_cel: FOR I IN 1 TO CEL_NUMBER LOOP
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all_param_b : FOR J IN 1 TO 3 LOOP
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SOS_with_gain_array(I)(J) := SOS_array(I)(J) * GAIN_array(I);
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END LOOP all_param_b;
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all_param_a : FOR J IN 4 TO 6 LOOP
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SOS_with_gain_array(I)(J) := SOS_array(I)(J);
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END LOOP all_param_a;
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END LOOP all_cel;
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all_cel_int: FOR I IN 1 TO CEL_NUMBER LOOP
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all_param_int: FOR J IN 1 TO 3 LOOP
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SOS_with_gain_array_integer(I)(J) := INTEGER( SOS_with_gain_array(I)(J) * REAL(2**(POINT_POSITION)) );
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END LOOP all_param_int;
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---------------------------------------------------------------------------
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-- INVERSION of A param due to fact that IIR_CEL module make only MULT and MAC operation
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all_param_int_a: FOR J IN 4 TO 6 LOOP
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SOS_with_gain_array_integer(I)(J) := INTEGER( SOS_with_gain_array(I)(J) * REAL(2**(POINT_POSITION)) * REAL_NEG );
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END LOOP all_param_int_a;
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---------------------------------------------------------------------------
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END LOOP all_cel_int;
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all_cel_output: FOR I IN 1 TO CEL_NUMBER LOOP
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all_param_b_out: FOR J IN 1 TO 3 LOOP
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config_vector( (((I-1)*5)+3-J)*COEFFICIENT_SIZE + COEFFICIENT_SIZE -1 DOWNTO (((I-1)*5)+3-J)*COEFFICIENT_SIZE ) := std_logic_vector(TO_SIGNED(SOS_with_gain_array_integer(I)(J),COEFFICIENT_SIZE ));
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END LOOP all_param_b_out;
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config_vector( (((I-1)*5)+3)*COEFFICIENT_SIZE + COEFFICIENT_SIZE -1 DOWNTO (((I-1)*5)+3)*COEFFICIENT_SIZE ) := std_logic_vector(TO_SIGNED(SOS_with_gain_array_integer(I)(6),COEFFICIENT_SIZE)); --a2
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config_vector( (((I-1)*5)+4)*COEFFICIENT_SIZE + COEFFICIENT_SIZE -1 DOWNTO (((I-1)*5)+4)*COEFFICIENT_SIZE ) := std_logic_vector(TO_SIGNED(SOS_with_gain_array_integer(I)(5),COEFFICIENT_SIZE)); --a1
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END LOOP all_cel_output;
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RETURN config_vector;
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END FUNCTION;
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END lpp_lfr_filter_coeff;
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