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- LIBRARY ieee;
- USE ieee.std_logic_1164.ALL;
- USE ieee.numeric_std.ALL;
- USE ieee.std_logic_unsigned.ALL;
- USE ieee.std_logic_signed.ALL;
-
- PACKAGE POLY_FIR_PKG IS
-
- -- NOTES and PACKAGE INSTRUCTIONS :
- -- cst_downsampling_factor must be a multiplier OF cst_nb_samples_adc_in
- -- and cst_nb_subfilters/cst_nb_samples_adc_in*cst_downsampling_factor must be an integer
- -- with cst_downsampling_factor < or = cst_nb_subfilters.
- --
- -- INPUT : vector of samples (cst_nb_samples_adc_in samples);
- -- OUTPUT : 2D matrix of samples (matrix_fir_data_out(y)(x), with y the
- -- subfilter number, and x the xth parallel fir);
- --
- -- the lower parallel fir, the older result.
-
-
-
- FUNCTION log2_sup_integer (number : natural) RETURN natural;
- FUNCTION log2_inf_integer (number : natural) RETURN natural;
-
- -- -- CONSTANTS -- --
-
- -- ADC
- CONSTANT cst_w_in : natural := 6; -- ADC in bitwidth
-
- CONSTANT cst_nb_samples_adc_in : natural := 80; -- ADC in nb samples
-
- -- FILTER
- --coefficients
- CONSTANT cst_w_coeff : natural := 8; -- coeffs bitwidth
- CONSTANT cst_nb_coeffs_filter_in : natural := 7*20;
- CONSTANT cst_log2_sup_nb_coeffs_subfilter_in : natural := 3;
-
- -- FIR
- CONSTANT cst_downsampling_factor : natural := 8;
- -- POLYPHASE FILTER
- CONSTANT cst_nb_subfilters : natural := 20;
-
-
- -- -- CALCULATIONS -- --
-
- CONSTANT cst_w_out : natural := cst_w_in + cst_w_coeff+cst_log2_sup_nb_coeffs_subfilter_in;
-
- -- SHIFT REG
-
- CONSTANT cst_nb_coeffs_subfilter_in : natural := cst_nb_coeffs_filter_in/cst_nb_subfilters;
- CONSTANT cst_nb_samples_shiftreg_temp_in : natural := cst_nb_coeffs_subfilter_in + cst_nb_samples_adc_in/cst_downsampling_factor;
- -- mult
- CONSTANT cst_w_mult_out : natural := cst_w_coeff+cst_w_in;
- -- adder
- CONSTANT cst_log2_adder_stages : natural := cst_log2_sup_nb_coeffs_subfilter_in;
- -- fir
- CONSTANT cst_w_fir_adder_out : natural := cst_w_mult_out+cst_log2_adder_stages;
- CONSTANT cst_nb_parallel_firs : natural := cst_nb_samples_adc_in/cst_downsampling_factor;
-
- -- TYPES
-
- -- ADC
- SUBTYPE smpl_adc_data_in IS std_logic_vector(cst_w_in-1 DOWNTO 0);
- SUBTYPE smpl_fir_data_out IS std_logic_vector(cst_w_out-1 DOWNTO 0);
-
-
- -- SHIFT REG
-
- TYPE vect_adc_data_out IS ARRAY (0 TO cst_nb_samples_adc_in-1) OF smpl_adc_data_in;
- TYPE vect_fir_data_in IS ARRAY(0 TO cst_nb_coeffs_subfilter_in-1) OF smpl_adc_data_in;
- TYPE vect_reg_data IS ARRAY(0 TO cst_nb_samples_shiftreg_temp_in-1) OF smpl_adc_data_in;
- TYPE matrix_reg_data IS ARRAY(0 TO cst_nb_subfilters-1) OF vect_reg_data;
-
- TYPE matrix_reg_data_out IS ARRAY(0 TO cst_nb_parallel_firs-1) OF vect_fir_data_in;
- TYPE matrix3D_reg_data_out IS ARRAY (0 TO cst_nb_subfilters-1) OF matrix_reg_data_out;
-
- -- FILTER
-
- SUBTYPE smpl_coeff IS std_logic_vector(cst_w_coeff-1 DOWNTO 0);
-
- -- mult
- SUBTYPE smpl_mult_data_out IS std_logic_vector(cst_w_mult_out-1 DOWNTO 0);
- SUBTYPE smpl_mult_data_out_signed IS signed(cst_w_mult_out-1 DOWNTO 0);
- SUBTYPE smpl_coeffs_signed IS signed(cst_w_coeff-1 DOWNTO 0);
- SUBTYPE smpl_mult_data_in_signed IS signed(cst_w_in-1 DOWNTO 0);
- TYPE vect_polyfir_coeffs_in IS ARRAY (0 TO cst_nb_coeffs_filter_in-1) OF smpl_coeff;
- TYPE vect_data_mult_in_signed IS ARRAY(0 TO cst_nb_coeffs_subfilter_in-1) OF smpl_mult_data_in_signed;
- TYPE vect_fir_coeffs_in IS ARRAY(0 TO cst_nb_coeffs_subfilter_in-1) OF smpl_coeff;
- TYPE vect_mult_coeffs_signed IS ARRAY(0 TO cst_nb_coeffs_subfilter_in-1) OF smpl_coeffs_signed;
- TYPE vect_mult_data_out IS ARRAY(0 TO cst_nb_coeffs_subfilter_in-1) OF smpl_mult_data_out;
- TYPE vect_mult_data_out_signed IS ARRAY(0 TO cst_nb_coeffs_subfilter_in-1) OF smpl_mult_data_out_signed;
- TYPE matrix_fir_coeffs_in IS ARRAY (0 TO cst_nb_subfilters-1) OF vect_fir_coeffs_in;
-
- -- adder
- SUBTYPE smpl_adder_generic IS std_logic_vector(cst_w_fir_adder_out-1 DOWNTO 0);
- SUBTYPE smpl_adder_generic_signed IS signed(cst_w_fir_adder_out-1 DOWNTO 0);
- TYPE vect_adder_generic IS ARRAY(0 TO 2**(cst_log2_adder_stages)-1) OF smpl_adder_generic;
- TYPE vect_adder_generic_signed IS ARRAY(0 TO 2**(cst_log2_adder_stages)-1) OF smpl_adder_generic_signed;
- TYPE matrix_adder_generic IS ARRAY(0 TO cst_log2_adder_stages) OF vect_adder_generic;
- TYPE matrix_adder_generic_signed IS ARRAY(0 TO cst_log2_adder_stages) OF vect_adder_generic_signed;
-
- -- fir
- SUBTYPE smpl_fir_adder_data_out IS std_logic_vector(cst_w_fir_adder_out-1 DOWNTO 0);
- TYPE vect_fir_adder_data_out IS ARRAY (0 TO cst_nb_parallel_firs-1) OF smpl_fir_adder_data_out;
- TYPE vect_fir_data_out IS ARRAY(0 TO cst_nb_parallel_firs-1) OF smpl_fir_data_out;
-
- -- POLYPHASE FILTER
-
- TYPE matrix_fir_data_out IS ARRAY (0 TO cst_nb_subfilters-1) OF vect_fir_data_out;
- -- TYPE matrix_coeffs_polyphase_filter IS array(0 to cst_nb_subfilters) OF vect_mult_coeffs;
-
-
-
-
-
- END;
-
- PACKAGE BODY POLY_FIR_PKG IS
-
-
- --functions
- FUNCTION log2_sup_integer (number : natural) RETURN natural IS
- VARIABLE result : natural;
- BEGIN
-
- IF(number <= 1) THEN
- result := 0;
- ELSIF(number = 2) THEN
- result := 1;
- ELSIF(number > 2 AND number <= 4) THEN
- result := 2;
- ELSIF(number > 4 AND number <= 8) THEN
- result := 3;
- ELSIF(number > 8 AND number <= 16) THEN
- result := 4;
- ELSIF(number > 16 AND number <= 32) THEN
- result := 5;
- ELSIF(number > 32 AND number <= 64) THEN
- result := 6;
- ELSIF(number > 64 AND number <= 128) THEN
- result := 7;
- ELSIF(number > 128 AND number <= 256) THEN
- result := 8;
- ELSIF(number > 256 AND number <= 512) THEN
- result := 9;
- ELSIF(number > 512 AND number <= 1024) THEN
- result := 10;
- ELSIF(number > 1024 AND number <= 2048) THEN
- result := 11;
- ELSIF(number > 2048 AND number <= 4096) THEN
- result := 12;
- ELSIF(number > 4096 AND number <= 8192) THEN
- result := 13;
- ELSIF(number > 8192 AND number <= 16384) THEN
- result := 14;
- ELSIF(number > 16384 AND number <= 32768) THEN
- result := 15;
- END IF;
- RETURN result;
- END FUNCTION;
-
- FUNCTION log2_inf_integer (number : natural) RETURN natural IS
- VARIABLE result : natural;
- BEGIN
-
- IF(number < 2) THEN
- result := 0;
- ELSIF(number >= 2 AND number < 4) THEN
- result := 1;
- ELSIF(number >= 4 AND number < 8) THEN
- result := 2;
- ELSIF(number >= 8 AND number < 16) THEN
- result := 3;
- ELSIF(number >= 16 AND number < 32) THEN
- result := 4;
- ELSIF(number >= 32 AND number < 64) THEN
- result := 5;
- ELSIF(number >= 64 AND number < 128) THEN
- result := 6;
- ELSIF(number >= 128 AND number < 256) THEN
- result := 7;
- ELSIF(number >= 256 AND number < 512) THEN
- result := 8;
- ELSIF(number >= 512 AND number < 1024) THEN
- result := 9;
- ELSIF(number >= 1024 AND number < 2048) THEN
- result := 10;
- ELSIF(number >= 2048 AND number < 4096) THEN
- Result := 11;
- ELSIF(Number >= 4096 AND number < 8192) THEN
- result := 12;
- ELSIF(number >= 8192 AND number < 16384) THEN
- result := 13;
- ELSIF(number >= 16384 AND number < 32768) THEN
- result := 14;
- END IF;
- RETURN result;
- END FUNCTION;
-
- END PACKAGE BODY;
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