Subversion Repositories canny_edge_detector

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
 
entity DoubleFiFOLineBuffer is
  generic (
	DATA_WIDTH : integer := 8;
	NO_OF_COLS : integer := 640
	);
  port(
    clk : in std_logic;
	fsync : in std_logic;
	pdata_in : in std_logic_vector(DATA_WIDTH -1 downto 0);
	pdata_out1 : out std_logic_vector(DATA_WIDTH -1 downto 0);
	pdata_out2 : buffer std_logic_vector(DATA_WIDTH -1 downto 0);
	pdata_out3 : buffer std_logic_vector(DATA_WIDTH -1 downto 0) );
  end DoubleFiFOLineBuffer;
 
architecture Behavioral of DoubleFiFOLineBuffer is
 
signal pdata_in_r : std_logic_vector(DATA_WIDTH -1 downto 0);
 
component FIFOLineBuffer is
  generic (
	DATA_WIDTH : integer := 8;
	NO_OF_COLS : integer := 640
	);
  port(
	clk : in std_logic;
	fsync : in std_logic;
	pdata_in : in std_logic_vector(DATA_WIDTH -1 downto 0);
	pdata_out : buffer std_logic_vector(DATA_WIDTH -1 downto 0));
  end component;
 
begin
 
  pdata_out1 <= pdata_in_r;
 
  update_reg : process (clk)
  begin 
    if rising_edge(clk) then
	  if fsync = '1' then
	   pdata_in_r <= pdata_in;
	  end if;
	end if;
  end process update_reg;  
 
  LineBuffer1 : FIFOLineBuffer
	generic map (
	  DATA_WIDTH => DATA_WIDTH,
	  NO_OF_COLS => NO_OF_COLS
	  )
	port map(clk,  fsync, pdata_in_r, pdata_out2);
 
  LineBuffer2 : FIFOLineBuffer
	generic map (
	  DATA_WIDTH => DATA_WIDTH,
	  NO_OF_COLS => NO_OF_COLS
	  )
	port map(clk, fsync, pdata_out2, pdata_out3);
 
 
end Behavioral;