| Line 32... |
Line 32... |
-- an alternating way: A(0), B(0), A(1), B(1).... etc
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-- an alternating way: A(0), B(0), A(1), B(1).... etc
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-- The separate function adds and subtracts two complex bins.
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-- The separate function adds and subtracts two complex bins.
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-- Therefore it causes 1 bit growth that needs to be rounded, as
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-- Therefore it causes 1 bit growth that needs to be rounded, as
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-- explained in fft_sepa.vhd
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-- explained in fft_sepa.vhd
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library ieee, common_pkg_lib, common_components_lib, common_add_sub_lib, common_requantize_lib, rTwoSDF_lib;
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library ieee, common_pkg_lib, common_components_lib, astron_adder_lib, astron_requantize_lib, astron_r2sdf_fft_lib;
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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 common_pkg_lib.common_pkg.all;
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use common_pkg_lib.common_pkg.all;
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use rTwoSDF_lib.rTwoSDFPkg.all;
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use astron_r2sdf_fft_lib.rTwoSDFPkg.all;
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use work.fft_pkg.all;
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use work.fft_pkg.all;
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|
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entity fft_r2_par is
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entity fft_r2_par is
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generic (
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generic (
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g_fft : t_fft := c_fft; -- generics for the FFT
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g_fft : t_fft := c_fft; -- generics for the FFT
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g_pipeline : t_fft_pipeline := c_fft_pipeline -- generics for pipelining, defined in rTwoSDF_lib.rTwoSDFPkg
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g_pipeline : t_fft_pipeline := c_fft_pipeline -- generics for pipelining, defined in astron_r2sdf_fft_lib.rTwoSDFPkg
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);
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);
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port (
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port (
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clk : in std_logic;
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clk : in std_logic;
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rst : in std_logic := '0';
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rst : in std_logic := '0';
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in_re_arr : in t_fft_slv_arr(g_fft.nof_points-1 downto 0);
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in_re_arr : in t_fft_slv_arr(g_fft.nof_points-1 downto 0);
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| Line 223... |
Line 223... |
---------------------------------------------------------------------------
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---------------------------------------------------------------------------
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-- Calulate the positive bins
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-- Calulate the positive bins
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---------------------------------------------------------------------------
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---------------------------------------------------------------------------
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gen_positive_bins : for I in 1 to g_fft.nof_points/2 - 1 generate
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gen_positive_bins : for I in 1 to g_fft.nof_points/2 - 1 generate
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-- common_add_sub
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-- common_add_sub
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a_output_real_adder : entity common_add_sub_lib.common_add_sub
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a_output_real_adder : entity astron_adder_lib.common_add_sub
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generic map (
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generic map (
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g_direction => "ADD",
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g_direction => "ADD",
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g_representation => "SIGNED",
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g_representation => "SIGNED",
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g_pipeline_input => 0,
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g_pipeline_input => 0,
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g_pipeline_output => c_pipeline_add_sub,
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g_pipeline_output => c_pipeline_add_sub,
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| Line 239... |
Line 239... |
in_a => int_re_arr(g_fft.nof_points-I),
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in_a => int_re_arr(g_fft.nof_points-I),
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in_b => int_re_arr(I),
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in_b => int_re_arr(I),
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result => add_arr(2*I)
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result => add_arr(2*I)
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);
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);
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b_output_real_adder : entity common_add_sub_lib.common_add_sub
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b_output_real_adder : entity astron_adder_lib.common_add_sub
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generic map (
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generic map (
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g_direction => "ADD",
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g_direction => "ADD",
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g_representation => "SIGNED",
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g_representation => "SIGNED",
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g_pipeline_input => 0,
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g_pipeline_input => 0,
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g_pipeline_output => c_pipeline_add_sub,
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g_pipeline_output => c_pipeline_add_sub,
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| Line 255... |
Line 255... |
in_a => int_im_arr(g_fft.nof_points-I),
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in_a => int_im_arr(g_fft.nof_points-I),
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in_b => int_im_arr(I),
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in_b => int_im_arr(I),
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result => add_arr(2*I+1)
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result => add_arr(2*I+1)
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);
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);
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a_output_imag_subtractor : entity common_add_sub_lib.common_add_sub
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a_output_imag_subtractor : entity astron_adder_lib.common_add_sub
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generic map (
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generic map (
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g_direction => "SUB",
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g_direction => "SUB",
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g_representation => "SIGNED",
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g_representation => "SIGNED",
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g_pipeline_input => 0,
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g_pipeline_input => 0,
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g_pipeline_output => c_pipeline_add_sub,
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g_pipeline_output => c_pipeline_add_sub,
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| Line 271... |
Line 271... |
in_a => int_im_arr(I),
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in_a => int_im_arr(I),
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in_b => int_im_arr(g_fft.nof_points-I),
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in_b => int_im_arr(g_fft.nof_points-I),
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result => sub_arr(2*I)
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result => sub_arr(2*I)
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);
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);
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b_output_imag_subtractor : entity common_add_sub_lib.common_add_sub
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b_output_imag_subtractor : entity astron_adder_lib.common_add_sub
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generic map (
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generic map (
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g_direction => "SUB",
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g_direction => "SUB",
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g_representation => "SIGNED",
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g_representation => "SIGNED",
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g_pipeline_input => 0,
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g_pipeline_input => 0,
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g_pipeline_output => c_pipeline_add_sub,
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g_pipeline_output => c_pipeline_add_sub,
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| Line 297... |
Line 297... |
fft_im_arr(2*I+1) <= sub_arr(2*I+1)(g_fft.stage_dat_w DOWNTO 1); -- B imag
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fft_im_arr(2*I+1) <= sub_arr(2*I+1)(g_fft.stage_dat_w DOWNTO 1); -- B imag
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end generate;
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end generate;
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|
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gen_sepa_round : IF c_sepa_round=true GENERATE
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gen_sepa_round : IF c_sepa_round=true GENERATE
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-- round the one LSbit
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-- round the one LSbit
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round_re_a : ENTITY common_requantize_lib.common_round
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round_re_a : ENTITY astron_requantize_lib.common_round
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GENERIC MAP (
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GENERIC MAP (
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_pipeline_input => 0, -- >= 0
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g_pipeline_input => 0, -- >= 0
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| Line 313... |
Line 313... |
clk => clk,
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clk => clk,
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in_dat => add_arr(2*I),
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in_dat => add_arr(2*I),
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out_dat => fft_re_arr(2*I)
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out_dat => fft_re_arr(2*I)
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);
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);
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round_re_b : ENTITY common_requantize_lib.common_round
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round_re_b : ENTITY astron_requantize_lib.common_round
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GENERIC MAP (
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GENERIC MAP (
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_pipeline_input => 0, -- >= 0
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g_pipeline_input => 0, -- >= 0
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| Line 329... |
Line 329... |
clk => clk,
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clk => clk,
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in_dat => add_arr(2*I+1),
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in_dat => add_arr(2*I+1),
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out_dat => fft_re_arr(2*I+1)
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out_dat => fft_re_arr(2*I+1)
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);
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);
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round_im_a : ENTITY common_requantize_lib.common_round
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round_im_a : ENTITY astron_requantize_lib.common_round
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GENERIC MAP (
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GENERIC MAP (
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_pipeline_input => 0, -- >= 0
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g_pipeline_input => 0, -- >= 0
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| Line 345... |
Line 345... |
clk => clk,
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clk => clk,
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in_dat => sub_arr(2*I),
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in_dat => sub_arr(2*I),
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out_dat => fft_im_arr(2*I)
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out_dat => fft_im_arr(2*I)
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);
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);
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|
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round_im_b : ENTITY common_requantize_lib.common_round
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round_im_b : ENTITY astron_requantize_lib.common_round
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GENERIC MAP (
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GENERIC MAP (
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_representation => "SIGNED", -- SIGNED (round +-0.5 away from zero to +- infinity) or UNSIGNED rounding (round 0.5 up to + inifinity)
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round => TRUE, -- when TRUE round the input, else truncate the input
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_round_clip => FALSE, -- when TRUE clip rounded input >= +max to avoid wrapping to output -min (signed) or 0 (unsigned)
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g_pipeline_input => 0, -- >= 0
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g_pipeline_input => 0, -- >= 0
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| Line 426... |
Line 426... |
|
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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-- Parallel FFT output requantization
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-- Parallel FFT output requantization
|
------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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gen_output_requantizers : for I in 0 to g_fft.nof_points-1 generate
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gen_output_requantizers : for I in 0 to g_fft.nof_points-1 generate
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u_requantize_re : entity common_requantize_lib.common_requantize
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u_requantize_re : entity astron_requantize_lib.common_requantize
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generic map (
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generic map (
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g_representation => "SIGNED",
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g_representation => "SIGNED",
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g_lsb_w => c_out_scale_w,
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g_lsb_w => c_out_scale_w,
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g_lsb_round => TRUE,
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g_lsb_round => TRUE,
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g_lsb_round_clip => FALSE,
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g_lsb_round_clip => FALSE,
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| Line 446... |
Line 446... |
in_dat => fft_re_arr(I),
|
in_dat => fft_re_arr(I),
|
out_dat => out_re_arr(I),
|
out_dat => out_re_arr(I),
|
out_ovr => open
|
out_ovr => open
|
);
|
);
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|
|
u_requantize_im : entity common_requantize_lib.common_requantize
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u_requantize_im : entity astron_requantize_lib.common_requantize
|
generic map (
|
generic map (
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g_representation => "SIGNED",
|
g_representation => "SIGNED",
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g_lsb_w => c_out_scale_w,
|
g_lsb_w => c_out_scale_w,
|
g_lsb_round => TRUE,
|
g_lsb_round => TRUE,
|
g_lsb_round_clip => FALSE,
|
g_lsb_round_clip => FALSE,
|
