pack.vhd

使用vhdl编写的一段程序。 主要功能是声音周期计算

  library ieee;
  use ieee.std_logic_1164.all;
  use work.components_pack.all;

  package pack is

    -- Path to data files
    constant PATH        : string                := "../matlab/";
    -- Input stimuli file
    constant INPUT_FILE  : string                := PATH & "input.dat";
    -- Output trace file
    constant OUTPUT_FILE : string                := PATH & "output.dat";
    -- Half a clock period 
    constant PULSEWIDTH  : time                  := 100 ns;
    -- Reset on startup

    constant RESET_TIME  : time                  := 200 ns;
    -- Input (A/D) wordlength
    constant AD_WIDTH    : integer := 16;
    -- Coefficient wordlength
    constant COEFF_WIDTH : integer := 12;
    -- Output (D/A) wordlength
    constant DA_WIDTH    : integer := 16;
      
   
    -- Filter order
    constant M           : integer                 := 8;
    -- Type definition for the impulse response
    type     impulse_response_type is array (0 to M) of integer;
    -- Example impulse response (8,0.8)
    constant H           : impulse_response_type :=
      (-4, 22, -84, 166, 822, 166, -84, 22, -4);
    -- Dynamic range of the result according to Ass.4 in Session 1
    -- constant RESULT_WIDTH : integer := 34;

    -- Type definitions for the filter
    subtype input_type is std_logic_vector(AD_WIDTH-1 downto 0);
    subtype output_type is std_logic_vector(DA_WIDTH-1 downto 0);
    subtype coeff_type is std_logic_vector(COEFF_WIDTH-1 downto 0);
    subtype mult_type is std_logic_vector(AD_WIDTH+COEFF_WIDTH-1 downto 0);
    subtype add_type is std_logic_vector(AD_WIDTH+COEFF_WIDTH+M-1 downto 0);
    type    product_type is array (0 to M) of mult_type;
    type    adder_type is array (0 to M) of add_type;
    type    reg_d_type is array (0 to M) of input_type;   -- direct form
    type    data_type is array (0 to 60) of output_type;  -- FIFO
   
    -- Type for controller   
    type en_type is record
                       addr           : std_logic_vector(5 downto 0);
                       en_FIR         : std_logic;
                       en_decimate    : std_logic;
                       en_FIFO        : std_logic;
                       clk_FIFO       : std_logic;
                       en_comparator  : std_logic;
                       en_peak        : std_logic;
                       en_clipper     : std_logic;
                       cs             : std_logic;
                       oe             : std_logic;
                       en_acc         : std_logic;
                       en_ipk         : std_logic;
                       en_clr         : std_logic;
                       recycle        : std_logic;
                       en_read        : std_logic;
                       en_write       : std_logic;
                     end record;
    
  end pack;