Subversion Repositories fast-crc

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
 
-- synopsys synthesis on
library STD;
use STD.TEXTIO.all;
-- synopsys synthesis off
 
entity CRC_top_tb is end CRC_top_tb;
 
architecture structural of CRC_top_tb is
 
component CRC_top
  port (
    phi1    : in    std_logic;
    phi2    : in    std_logic;
    reset   : in    std_logic;
    input   : in    std_logic_vector(15 downto 0);
    fcs_out : out std_logic_vector(31 downto 0));
end component;
 
signal phi1, phi2, reset : std_logic;
signal input             : std_logic_vector(15 downto 0);
signal fcs_out           : std_logic_vector(31 downto 0);
 
-- We also specify the files used to get the data and to put the data back
 
file file_read : text is in "/h/d1/c/x00jn/CRC_generator/data/data_in.dat";
file file_out  : text is out "/h/d1/c/x00jn/CRC_generator/data/data_out.dat";
 
begin  -- structural
 
 
  -- Important: These parameters have been calculated for a 500MHz
  -- relative clock -2 ns per stage-
  p_phi1: process
  begin  -- process p_phi1 
    phi1 <= '1', '0' after 2.1 ns;
    wait for 4.2 ns;
  end process p_phi1;
 
  p_phi2: process
  begin  -- process p_phi2
    phi2 <= '1', '0' after 0.3 ns, '1' after 1.8 ns;
    wait for 4.2 ns;
  end process p_phi2;
 
  p_reset: process
  begin  -- process p_reset
    reset <= '0' after 10 ns, '1' after 30 ns;
    wait;
  end process p_reset;
 
  p_input: process (phi1)
    variable input_file : bit_vector(15 downto 0);
    variable line : line;
  begin  -- process p_input
   if phi1'event and phi1='1' then 
    if (not (endfile(file_read))) then
      readline (file_read, line);
      read(line, input_file);
      input <= To_StdLogicVector(input_file);
--      wait for 2 ns;                    -- IMPORTANT!! Modify this to change
--                                        -- the speed of the incoming data!
    end if;
   end if;    
  end process p_input;
 
  p_output: process (phi2)
    variable output_file : bit_vector(31 downto 0);
    variable line : line;
  begin  -- process p_output
    if phi2'event and phi2 = '1' then  -- rising clock edge
      output_file:=To_BitVector(fcs_out);
      write(line,output_file);
      writeline(file_out,line);
    end if;
  end process p_output;
 
  CRC_1 : CRC_top port map (phi1 => phi1, phi2 => phi2, reset => reset,
                            input => input, fcs_out => fcs_out);
 
end structural;
 
configuration cfg_CRC_top_tb_structural of CRC_top_tb is
 
  for structural
    for CRC_1: CRC_top use entity work.CRC_top(structural); end for;
  end for;
 
end cfg_CRC_top_tb_structural;