Subversion Repositories mkjpeg

----------------------------------------------------------------------------------

-- Company: 

-- Engineer: 

-- 

-- Create Date:    12:18:01 03/12/2011 

-- Design Name: 

-- Module Name:    multiplier - Behavioral 

-- Project Name: 

-- Target Devices: 

-- Tool versions: 

-- Description: 

--

-- Dependencies: 

--

-- Revision: 

-- Revision 0.01 - File Created

-- Additional Comments: 

--

----------------------------------------------------------------------------------

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use ieee.numeric_std.all;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

--use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating

-- any Xilinx primitives in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

entity multiplier is

        port (

                                CLK                : in  std_logic;

                                RST                : in  std_logic;

                                -- 

                                img_size_x         : in  std_logic_vector(15 downto 0);

                                img_size_y         : in  std_logic_vector(15 downto 0);

                                --

                                result                                  : out std_logic_vector(31 downto 0);

                                threshold                               : out std_logic_vector(31 downto 0)

                        );

end multiplier;

architecture Behavioral of multiplier is

signal prev_x : std_logic_vector(15 downto 0);

signal prev_y : std_logic_vector(15 downto 0);

begin

        process(CLK, RST)

        begin

                if (RST = '1') then

                        result <= x"00000000";

                        threshold <= x"00000000";

                        prev_x <= x"0000";

                        prev_y <= x"0000";

                elsif (CLK'event and CLK = '1') then

                        if (prev_x /= img_size_x or prev_y /= img_size_y) then

                                result <= img_size_x * img_size_y;

                                threshold <= img_size_x * x"0007";

                        end if;

                        prev_x <= img_size_x;

                        prev_y <= img_size_y;

                end if;

        end process;

end Behavioral;