microprogrammed-processor/arithmetic_unit_tb.vhd at master · ammarqureshi/microprogrammed-processor · GitHub

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--------------------------------------------------------------------------------
--
--------------------------------------------------------------------------------
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;


ENTITY arithmetic_unit_tb IS
END arithmetic_unit_tb;

ARCHITECTURE behavior OF arithmetic_unit_tb IS

    -- Component Declaration for the Unit Under Test (UUT)

    COMPONENT arithmeticUnit
    PORT(
         Ain : IN  std_logic_vector(15 downto 0);
         Bin : IN  std_logic_vector(15 downto 0);
         s0 : IN  std_logic;
         s1 : IN  std_logic;
         cin : IN  std_logic;
         nf : OUT  std_logic;
         zf : OUT  std_logic;
         ovf : OUT  std_logic;
         cout : OUT  std_logic;
         G : OUT  std_logic_vector(15 downto 0)
        );
    END COMPONENT;


    --Inputs
   signal Ain : std_logic_vector(15 downto 0) := (others => '0');
   signal Bin : std_logic_vector(15 downto 0) := (others => '0');
   signal s0 : std_logic := '0';
   signal s1 : std_logic := '0';
   signal cin : std_logic := '0';

 	--Outputs
   signal nf : std_logic;
   signal zf : std_logic;
   signal ovf : std_logic;
   signal cout : std_logic;
   signal G : std_logic_vector(15 downto 0);
   -- No clocks detected in port list. Replace <clock> below with
   -- appropriate port name


BEGIN

	-- Instantiate the Unit Under Test (UUT)
   uut: arithmeticUnit PORT MAP (
          Ain => Ain,
          Bin => Bin,
          s0 => s0,
          s1 => s1,
          cin => cin,
          nf => nf,
          zf => zf,
          ovf => ovf,
          cout => cout,
          G => G
        );


   -- Stimulus process
   stim_proc: process
   begin


--transfer A
	Ain<="0000000000000000";
	Bin<="0000000000000001";
	cin<='0';
	s0<='0';
	s1<='0';


      wait for 100 ns;
--increment by 1
	Ain<="0000000000000001";
	Bin<="0000000000000000";
	cin<='1';
	s0<='0';
	s1<='0';

--A+B
		wait for 100ns;
	Ain<="0000000000000001";
	Bin<="0000000000000011";
	cin<='0';
	s0<='1';
	s1<='0';


--A+B+1
	wait for 100ns;
	Ain<="0000000000000001";
	Bin<="0000000000000011";
	cin<='1';
	s0<='1';
	s1<='0';


--decrement by 1
		wait for 100ns;
	Ain<="0000000000000011";
	Bin<="0000000000000001";
	cin<='0';
	s0<='1';
	s1<='1';
--A-B
	wait for 100ns;
	Ain<="0000000000000111";
	Bin<="0000000000000001";
	cin<='1';
	s0<='0';
	s1<='1';
--A + COMPLEMENT OF B

	wait for 100ns;
	cin<='0';
	Ain<="0000000000000000";
	Bin<="0000000000000001";
	s0<='0';
	s1<='1';


      wait;
   end process;

END;