testbcd.vhdtst

altium designer09设计教程+原理图+PCB实例

library IEEE;
use ieee.std_logic_1164.all;
use ieee.std_logic_textio.all;
use std.textio.all;

entity TestBCD is
end TestBCD;

architecture Stimulus of TestBCD is
    file RESULTS: text open WRITE_MODE is "results.txt";

    procedure WRITE_RESULTS(UPPER: std_logic_vector(3 downto 0);
                            LOWER: std_logic_vector(3 downto 0);
                            URCO : std_logic;
                            PARITY : std_logic) is
       variable s : line;
    begin
       write(s, now, right, 15, ns);
       write(s, UPPER, right, 5);
       write(s, LOWER, right, 5);
       write(s, URCO, right, 2);
       write(s, PARITY, right, 2);
       writeline(results, s);
    end procedure;

    component BCD8
       port (
          CLEAR: in std_logic;
          CLOCK: in std_logic;
          ENABLE: in std_logic;
          URCO: out std_logic;
          PARITY : out STD_LOGIC;
          UPPER: out std_logic_vector(3 downto 0);
          LOWER: out std_logic_vector(3 downto 0)
       );
    end component;

    signal CLEAR: std_logic;
    signal CLOCK: std_logic;
    signal ENABLE:std_logic;
    signal URCO:  std_logic;
    signal PARITY:  std_logic;
    signal UPPER: std_logic_vector(3 downto 0);
    signal LOWER: std_logic_vector(3 downto 0);

begin


    DUT:BCD8 port map (
       CLEAR => CLEAR,
       CLOCK => CLOCK,
       ENABLE => ENABLE,
       URCO => URCO,
       PARITY => PARITY,
       UPPER => UPPER,
       LOWER => LOWER
    );

    STIMULUS0:process
    begin
        ENABLE <= '1';
        CLEAR  <= '1';
        wait for 1 ns;
        CLEAR <= '0';
        wait;
    end process;

    CLK0:process
    begin
       CLOCK <= '1';
       wait for 10 ns;
       CLOCK <= '0';
       wait for 10 ns;
    end process;

    WRITE_RESULTS(UPPER, LOWER, URCO, PARITY);

end architecture;