library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_SIGNED.ALL;
use IEEE.numeric_bit.all;
 
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--USE ieee.numeric_std.ALL;
 
ENTITY mult8X8testbench IS
END mult8X8testbench;

ARCHITECTURE behavior OF mult8X8testbench IS 
 
    -- Component Declaration for the Unit Under Test (UUT)
 
    COMPONENT mult8X8
    PORT(
         Clk : IN  std_logic;
         St : IN  std_logic;
         Mplier : IN  std_logic_vector(7 downto 0);
         Mcand : IN  std_logic_vector(7 downto 0);
		   Product : OUT  std_logic_vector(15 downto 0);
         Done : OUT  std_logic
        );
    END COMPONENT;
	 
    constant N: integer := 4;
	 type arr is array(1 to N) of std_logic_vector(7 downto 0);
	 constant Mcandarr: arr := ("01100110","10100110","01101011","11001100");
	 constant Mplierarr: arr := ("00110011","01100110","10001110","10011001");

   --Inputs
   signal Clk : std_logic := '0';
   signal St : std_logic := '0';
   signal Mplier : std_logic_vector(7 downto 0) := (others => '0');
   signal Mcand : std_logic_vector(7 downto 0) := (others => '0');

 	--Outputs
	signal Product : std_logic_vector(15 downto 0);
   signal Done : std_logic;

   -- Clock period definitions
   constant Clk_period : time := 10 ns;
 
BEGIN
 
	-- Instantiate the Unit Under Test (UUT)
   uut: mult8X8 PORT MAP (
          Clk => Clk,
          St => St,
          Mplier => Mplier,
          Mcand => Mcand,
			 Product => Product,
          Done => Done
        );
	  
   Clk<= not Clk after 10ns;
	
   -- Clock process definitions
   Clk_process :process
   begin	
	   for i in 1 to N loop
		    Mcand <= Mcandarr(i);
			 Mplier <= Mplierarr(i);
			 St <= '1';
			 wait until Clk = '1' and Clk'event;
			 St <= '0';
			 wait until done = '1';
			 wait until Clk = '1' and Clk'event;
		end loop;
		Clk <= '0';
		wait for Clk_period/2;
		Clk <= '1';
		wait for Clk_period/2;
   end process;
 

   -- Stimulus process
   ----stim_proc: process
   ----begin		
      -- hold reset state for 100 ns.
      ----wait for 100 ns;	

      ----wait for Clk_period*10;

      -- insert stimulus here 

      ----wait;
   ----end process;

END;