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[/] [mkjpeg/] [trunk/] [design/] [huffman/] [DoubleFifo.vhd] - Blame information for rev 25

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1 25 mikel262 
-------------------------------------------------------------------------------
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-- File Name :  DoubleFifo.vhd
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--
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-- Project   : JPEG_ENC
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--
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-- Module    : DoubleFifo
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--
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-- Content   : DoubleFifo
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--
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-- Description :
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--
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-- Spec.     :
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--
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-- Author    : Michal Krepa
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--
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-------------------------------------------------------------------------------
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-- History :
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-- 20090228: (MK): Initial Creation.
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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----------------------------------- LIBRARY/PACKAGE ---------------------------
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-- generic packages/libraries:
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-------------------------------------------------------------------------------
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library ieee;
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  use ieee.std_logic_1164.all;
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  use ieee.numeric_std.all;
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-------------------------------------------------------------------------------
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-- user packages/libraries:
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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----------------------------------- ENTITY ------------------------------------
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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entity DoubleFifo is
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  port
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  (
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        CLK                : in  std_logic;
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        RST                : in  std_logic;
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        -- HUFFMAN
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        data_in            : in  std_logic_vector(7 downto 0);
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        wren               : in  std_logic;
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        -- BYTE STUFFER
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        buf_sel            : in  std_logic;
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        rd_req             : in  std_logic;
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        fifo_empty         : out std_logic;
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        data_out           : out std_logic_vector(7 downto 0)
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    );
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end entity DoubleFifo;
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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----------------------------------- ARCHITECTURE ------------------------------
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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architecture RTL of DoubleFifo is
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  signal fifo1_rd      : std_logic;
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  signal fifo1_wr      : std_logic;
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  signal fifo1_q       : std_logic_vector(7 downto 0);
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  signal fifo1_full    : std_logic;
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  signal fifo1_empty   : std_logic;
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  signal fifo1_count   : std_logic_vector(7 downto 0);
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  signal fifo2_rd      : std_logic;
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  signal fifo2_wr      : std_logic;
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  signal fifo2_q       : std_logic_vector(7 downto 0);
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  signal fifo2_full    : std_logic;
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  signal fifo2_empty   : std_logic;
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  signal fifo2_count   : std_logic_vector(7 downto 0);
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  signal fifo_data_in  : std_logic_vector(7 downto 0);
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-------------------------------------------------------------------------------
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-- Architecture: begin
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-------------------------------------------------------------------------------
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begin
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  -------------------------------------------------------------------
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  -- FIFO 1
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  -------------------------------------------------------------------
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  U_FIFO_1 : entity work.FIFO
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  generic map
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  (
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        DATA_WIDTH        => 8,
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        ADDR_WIDTH        => 7
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  )
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  port map
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  (
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        rst               => RST,
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        clk               => CLK,
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        rinc              => fifo1_rd,
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        winc              => fifo1_wr,
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        datai             => fifo_data_in,
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        datao             => fifo1_q,
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        fullo             => fifo1_full,
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        emptyo            => fifo1_empty,
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        count             => fifo1_count
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  );
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  -------------------------------------------------------------------
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  -- FIFO 2
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  -------------------------------------------------------------------
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  U_FIFO_2 : entity work.FIFO
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  generic map
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  (
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        DATA_WIDTH        => 8,
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        ADDR_WIDTH        => 7
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  )
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  port map
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  (
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        rst               => RST,
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        clk               => CLK,
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        rinc              => fifo2_rd,
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        winc              => fifo2_wr,
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        datai             => fifo_data_in,
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        datao             => fifo2_q,
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        fullo             => fifo2_full,
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        emptyo            => fifo2_empty,
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        count             => fifo2_count
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  );
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  -------------------------------------------------------------------
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  -- mux2
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  -------------------------------------------------------------------
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  p_mux2 : process(CLK, RST)
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  begin
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    if RST = '1' then
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      fifo1_wr <= '0';
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      fifo2_wr <= '0';
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      fifo_data_in <= (others => '0');
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    elsif CLK'event and CLK = '1' then
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      if buf_sel = '0' then
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        fifo1_wr <= wren;
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      else
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        fifo2_wr <= wren;
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      end if;
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      fifo_data_in <= data_in;
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    end if;
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  end process;
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  -------------------------------------------------------------------
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  -- mux3
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  -------------------------------------------------------------------
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  p_mux3 : process(CLK, RST)
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  begin
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    if RST = '1' then
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      data_out   <= (others => '0');
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      fifo1_rd   <= '0';
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      fifo2_rd   <= '0';
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      fifo_empty <= '0';
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    elsif CLK'event and CLK = '1' then
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      if buf_sel = '1' then
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        data_out   <= fifo1_q;
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        fifo1_rd   <= rd_req;
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        fifo_empty <= fifo1_empty;
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      else
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        data_out <= fifo2_q;
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        fifo2_rd <= rd_req;
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        fifo_empty <= fifo2_empty;
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      end if;
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    end if;
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  end process;
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end architecture RTL;
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-------------------------------------------------------------------------------
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-- Architecture: end
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-------------------------------------------------------------------------------

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