Subversion Repositories astron_wb_fft

-------------------------------------------------------------------------------

--

-- Copyright 2020

-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>

-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands

-- 

-- Licensed under the Apache License, Version 2.0 (the "License");

-- you may not use this file except in compliance with the License.

-- You may obtain a copy of the License at

-- 

--     http://www.apache.org/licenses/LICENSE-2.0

-- 

-- Unless required by applicable law or agreed to in writing, software

-- distributed under the License is distributed on an "AS IS" BASIS,

-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

-- See the License for the specific language governing permissions and

-- limitations under the License.

--

-------------------------------------------------------------------------------

--

-- Purpose: Test bench for the pipelined radix-2 FFT.

--

--          The testbech uses a blockgenerator to generate data for 

--          the input of the parallel FFT. 

--          The output of the FFT is stored in a databuffer. 

--          Both the block generator and databuffer are controlled

--          via a mm interface. 

--          Use this testbench in conjunction with ../python/tc_mmf_fft_r2_pipe.py

--

-- Usage:

--   > run -all

--   > Run python script in separate terminal: "python tc_mmf_fft_r2_pipe.py --unb 0 --bn 0 --sim"

--   > Check the results of the python script. 

--   > Stop the simulation manually in Modelsim by pressing the stop-button. 

LIBRARY IEEE, common_pkg_lib, astron_mm_lib, astron_diagnostics_lib, dp_pkg_lib, astron_r2sdf_fft_lib;

USE IEEE.std_logic_1164.ALL;

USE IEEE.numeric_std.ALL;

USE common_pkg_lib.common_pkg.ALL;

USE common_lib.common_mem_pkg.ALL;

USE common_pkg_lib.common_str_pkg.ALL;

USE common_pkg_lib.tb_common_pkg.ALL;

USE common_lib.tb_common_mem_pkg.ALL;

USE astron_mm_lib.mm_file_unb_pkg.ALL;

USE astron_mm_lib.mm_file_pkg.ALL;

USE dp_pkg_lib.dp_stream_pkg.ALL;

USE astron_r2sdf_fft_lib.rTwoSDFPkg.all;

USE work.fft_pkg.all;

ENTITY tb_mmf_fft_r2_pipe IS

  GENERIC(

    g_fft : t_fft := (true, false, false, 1, 1, 0, 64, 8, 14, 0, c_dsp_mult_w, 2, true, 56, 2)

    --  type t_rtwo_fft is record

    --    use_reorder    : boolean;  -- = false for bit-reversed output, true for normal output

    --    use_fft_shift  : boolean;  -- = false for [0, pos, neg] bin frequencies order, true for [neg, 0, pos] bin frequencies order in case of complex input

    --    use_separate   : boolean;  -- = false for complex input, true for two real inputs

    --    nof_chan       : natural;  -- = default 0, defines the number of channels (=time-multiplexed input signals): nof channels = 2**nof_chan     

    --    wb_factor      : natural;  -- = default 1, wideband factor

    --    twiddle_offset : natural;  -- = default 0, twiddle offset for PFT sections in a wideband FFT

    --    nof_points     : natural;  -- = 1024, N point FFT

    --    in_dat_w       : natural;  -- = 8, number of input bits

    --    out_dat_w      : natural;  -- = 13, number of output bits: in_dat_w + natural((ceil_log2(nof_points))/2 + 2)  

    --    out_gain_w     : natural;  -- = 0, output gain factor applied after the last stage output, before requantization to out_dat_w

    --    stage_dat_w    : natural;  -- = 18, data width used between the stages(= DSP multiplier-width)

    --    guard_w        : natural;  -- = 2,  Guard used to avoid overflow in FFT stage. 

    --    guard_enable   : boolean;  -- = true when input needs guarding, false when input requires no guarding but scaling must be skipped at the last stage(s) (used in wb fft)

    --    stat_data_w    : positive; -- = 56

    --    stat_data_sz   : positive; -- = 2

    --  end record;

  );

END tb_mmf_fft_r2_pipe;

ARCHITECTURE tb OF tb_mmf_fft_r2_pipe IS

  CONSTANT c_sim                : BOOLEAN := TRUE;

  ----------------------------------------------------------------------------

  -- Clocks and resets

  ----------------------------------------------------------------------------   

  CONSTANT c_mm_clk_period      : TIME := 1 ns;

  CONSTANT c_dp_clk_period      : TIME := 5 ns;

  CONSTANT c_dp_pps_period      : NATURAL := 64;

  SIGNAL dp_pps                 : STD_LOGIC;

  SIGNAL mm_rst                 : STD_LOGIC;

  SIGNAL mm_clk                 : STD_LOGIC := '0';

  SIGNAL dp_rst                 : STD_LOGIC;

  SIGNAL dp_clk                 : STD_LOGIC := '0';

  ----------------------------------------------------------------------------

  -- MM buses

  ----------------------------------------------------------------------------                                         

  SIGNAL reg_diag_bg_mosi          : t_mem_mosi;

  SIGNAL reg_diag_bg_miso          : t_mem_miso;

  SIGNAL ram_diag_bg_mosi          : t_mem_mosi;

  SIGNAL ram_diag_bg_miso          : t_mem_miso;

  SIGNAL ram_ss_ss_wide_mosi       : t_mem_mosi;

  SIGNAL ram_ss_ss_wide_miso       : t_mem_miso;

  SIGNAL ram_diag_data_buf_re_mosi : t_mem_mosi;

  SIGNAL ram_diag_data_buf_re_miso : t_mem_miso;

  SIGNAL reg_diag_data_buf_re_mosi : t_mem_mosi;

  SIGNAL reg_diag_data_buf_re_miso : t_mem_miso;

  SIGNAL ram_diag_data_buf_im_mosi : t_mem_mosi;

  SIGNAL ram_diag_data_buf_im_miso : t_mem_miso;

  SIGNAL reg_diag_data_buf_im_mosi : t_mem_mosi;

  SIGNAL reg_diag_data_buf_im_miso : t_mem_miso;

  CONSTANT c_nof_channels           : NATURAL  := 2**g_fft.nof_chan;

  CONSTANT c_nof_streams            : POSITIVE := g_fft.wb_factor;

  CONSTANT c_nof_integration        : NATURAL  := 8;

  CONSTANT c_bg_block_len           : NATURAL  := g_fft.nof_points*c_nof_integration*c_nof_channels;

  CONSTANT c_bg_buf_adr_w           : NATURAL := ceil_log2(c_bg_block_len);

  CONSTANT c_bg_data_file_index_arr : t_nat_natural_arr := array_init(0, 16, 1);

  CONSTANT c_bg_data_file_prefix    : STRING := "UNUSED";

  SIGNAL bg_siso_arr                : t_dp_siso_arr(0 DOWNTO 0) := (OTHERS=>c_dp_siso_rdy);

  SIGNAL bg_sosi_arr                : t_dp_sosi_arr(0 DOWNTO 0);

  SIGNAL ss_out_sosi_re_arr         : t_dp_sosi_arr(0 DOWNTO 0) := (OTHERS => c_dp_sosi_rst);

  SIGNAL ss_out_sosi_im_arr         : t_dp_sosi_arr(0 DOWNTO 0) := (OTHERS => c_dp_sosi_rst);

  SIGNAL in_re                      : STD_LOGIC_VECTOR(g_fft.in_dat_w-1 DOWNTO 0);

  SIGNAL in_im                      : STD_LOGIC_VECTOR(g_fft.in_dat_w-1 DOWNTO 0);

  SIGNAL in_val                     : STD_LOGIC := '0';

  SIGNAL out_re                     : STD_LOGIC_VECTOR(g_fft.out_dat_w-1 DOWNTO 0);

  SIGNAL out_im                     : STD_LOGIC_VECTOR(g_fft.out_dat_w-1 DOWNTO 0);

  SIGNAL out_val                    : STD_LOGIC := '0';

BEGIN

  ----------------------------------------------------------------------------

  -- Clock and reset generation

  ----------------------------------------------------------------------------

  mm_clk <= NOT mm_clk AFTER c_mm_clk_period/2;

  mm_rst <= '1', '0' AFTER c_mm_clk_period*5;

  dp_clk <= NOT dp_clk AFTER c_dp_clk_period/2;

  dp_rst <= '1', '0' AFTER c_dp_clk_period*5;

  ------------------------------------------------------------------------------

  -- External PPS

  ------------------------------------------------------------------------------  

  proc_common_gen_pulse(1, c_dp_pps_period, '1', dp_clk, dp_pps);

   ----------------------------------------------------------------------------

  -- Procedure that polls a sim control file that can be used to e.g. get

  -- the simulation time in ns

  ----------------------------------------------------------------------------

  mmf_poll_sim_ctrl_file(c_mmf_unb_file_path & "sim.ctrl", c_mmf_unb_file_path & "sim.stat");

  ----------------------------------------------------------------------------

  -- MM buses  

  ----------------------------------------------------------------------------

  u_mm_file_reg_diag_bg          : mm_file GENERIC MAP(mmf_unb_file_prefix(0, 0, "BN") & "REG_DIAG_BG")

                                           PORT MAP(mm_rst, mm_clk, reg_diag_bg_mosi, reg_diag_bg_miso);

  u_mm_file_ram_diag_bg          : mm_file GENERIC MAP(mmf_unb_file_prefix(0, 0, "BN") & "RAM_DIAG_BG")

                                           PORT MAP(mm_rst, mm_clk, ram_diag_bg_mosi, ram_diag_bg_miso);

  u_mm_file_ram_diag_data_buf_re : mm_file GENERIC MAP(mmf_unb_file_prefix(0, 0, "BN") & "RAM_DIAG_DATA_BUFFER_REAL")

                                           PORT MAP(mm_rst, mm_clk, ram_diag_data_buf_re_mosi, ram_diag_data_buf_re_miso);

  u_mm_file_reg_diag_data_buf_re : mm_file GENERIC MAP(mmf_unb_file_prefix(0, 0, "BN") & "REG_DIAG_DATA_BUFFER_REAL")

                                           PORT MAP(mm_rst, mm_clk, reg_diag_data_buf_re_mosi, reg_diag_data_buf_re_miso);

  u_mm_file_ram_diag_data_buf_im : mm_file GENERIC MAP(mmf_unb_file_prefix(0, 0, "BN") & "RAM_DIAG_DATA_BUFFER_IMAG")

                                           PORT MAP(mm_rst, mm_clk, ram_diag_data_buf_im_mosi, ram_diag_data_buf_im_miso);

  u_mm_file_reg_diag_data_buf_im : mm_file GENERIC MAP(mmf_unb_file_prefix(0, 0, "BN") & "REG_DIAG_DATA_BUFFER_IMAG")

                                           PORT MAP(mm_rst, mm_clk, reg_diag_data_buf_im_mosi, reg_diag_data_buf_im_miso);

  ----------------------------------------------------------------------------

  -- Source: block generator

  ---------------------------------------------------------------------------- 

  u_bg : ENTITY astron_diagnostics_lib.mms_diag_block_gen

  GENERIC MAP(

    g_nof_output_streams => c_nof_streams,

    g_buf_dat_w          => c_nof_complex*g_fft.in_dat_w,

    g_buf_addr_w         => c_bg_buf_adr_w,               -- Waveform buffer size 2**g_buf_addr_w nof samples

    g_file_index_arr     => c_bg_data_file_index_arr,

    g_file_name_prefix   => c_bg_data_file_prefix

  )

  PORT MAP(

    -- System

    mm_rst           => mm_rst,

    mm_clk           => mm_clk,

    dp_rst           => dp_rst,

    dp_clk           => dp_clk,

    en_sync          => dp_pps,

    -- MM interface

    reg_bg_ctrl_mosi => reg_diag_bg_mosi,

    reg_bg_ctrl_miso => reg_diag_bg_miso,

    ram_bg_data_mosi => ram_diag_bg_mosi,

    ram_bg_data_miso => ram_diag_bg_miso,

    -- ST interface

    out_siso_arr     => bg_siso_arr,

    out_sosi_arr     => bg_sosi_arr

  );

  in_re  <= bg_sosi_arr(0).re(g_fft.in_dat_w-1 DOWNTO 0);

  in_im  <= bg_sosi_arr(0).im(g_fft.in_dat_w-1 DOWNTO 0);

  in_val <= bg_sosi_arr(0).valid;

  -- DUT = Device Under Test

  u_dut : ENTITY work.fft_r2_pipe

  GENERIC MAP(

    g_fft      => g_fft     -- generics for the FFT

  )

  port map(

    clk       => dp_clk,

    rst       => dp_rst,

    in_re     => in_re,

    in_im     => in_im,

    in_val    => in_val,

    out_re    => out_re,

    out_im    => out_im,

    out_val   => out_val

  );

  ss_out_sosi_re_arr(0).data  <= RESIZE_SVEC(out_re, ss_out_sosi_re_arr(0).data'LENGTH);

  ss_out_sosi_re_arr(0).valid <= out_val;

  ss_out_sosi_re_arr(0).sync  <= out_val;

  ss_out_sosi_im_arr(0).data  <= RESIZE_SVEC(out_im, ss_out_sosi_im_arr(0).data'LENGTH);

  ss_out_sosi_im_arr(0).valid <= out_val;

  ss_out_sosi_im_arr(0).sync  <= out_val;

  ----------------------------------------------------------------------------

  -- Sink: data buffer real 

  ---------------------------------------------------------------------------- 

  u_data_buf_re : ENTITY astron_diagnostics_lib.mms_diag_data_buffer

  GENERIC MAP (

    g_nof_streams  => c_nof_streams,

    g_data_w       => g_fft.out_dat_w,

    g_buf_nof_data => c_bg_block_len,

    g_buf_use_sync => FALSE

  )

  PORT MAP (

    -- System

    mm_rst            => mm_rst,

    mm_clk            => mm_clk,

    dp_rst            => dp_rst,

    dp_clk            => dp_clk,

    -- MM interface

    ram_data_buf_mosi => ram_diag_data_buf_re_mosi,

    ram_data_buf_miso => ram_diag_data_buf_re_miso,

    reg_data_buf_mosi => reg_diag_data_buf_re_mosi,

    reg_data_buf_miso => reg_diag_data_buf_re_miso,

    -- ST interface

    in_sync           => ss_out_sosi_re_arr(0).sync,

    in_sosi_arr       => ss_out_sosi_re_arr

  );

  ----------------------------------------------------------------------------

  -- Sink: data buffer imag 

  ---------------------------------------------------------------------------- 

  u_data_buf_im : ENTITY astron_diagnostics_lib.mms_diag_data_buffer

  GENERIC MAP (

    g_nof_streams  => c_nof_streams,

    g_data_w       => g_fft.out_dat_w,

    g_buf_nof_data => c_bg_block_len,

    g_buf_use_sync => FALSE

  )

  PORT MAP (

    -- System

    mm_rst            => mm_rst,

    mm_clk            => mm_clk,

    dp_rst            => dp_rst,

    dp_clk            => dp_clk,

    -- MM interface

    ram_data_buf_mosi => ram_diag_data_buf_im_mosi,

    ram_data_buf_miso => ram_diag_data_buf_im_miso,

    reg_data_buf_mosi => reg_diag_data_buf_im_mosi,

    reg_data_buf_miso => reg_diag_data_buf_im_miso,

    -- ST interface

    in_sync           => ss_out_sosi_im_arr(0).sync,

    in_sosi_arr       => ss_out_sosi_im_arr

  );

END tb;