Subversion Repositories pcie_sg_dma

----------------------------------------------------------------------------------
-- Company:  ziti, Uni. HD
-- Engineer:  wgao
-- 
-- Create Date:    16:37:22 12 Feb 2009
-- Design Name: 
-- Module Name:    FIFO_wrapper - Behavioral 
-- Project Name: 
-- Target Devices: 
-- Tool versions: 
-- Description: 
--
-- Dependencies: 
--
-- Revision 1.00 - first release.  13.02.2009
-- 
-- Additional Comments: 
--
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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
 
library work;
use work.abb64Package.all;
 
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
 
entity FIFO_wrapper is
    Generic (
             C_ASYNFIFO_WIDTH  :  integer  :=  72
            );
    Port ( 
          wr_clk      : IN  std_logic;
          wr_en       : IN  std_logic;
          din         : IN  std_logic_VECTOR(C_ASYNFIFO_WIDTH-1 downto 0);
          pfull       : OUT std_logic;
          full        : OUT std_logic;
 
          rd_clk      : IN  std_logic;
          rd_en       : IN  std_logic;
          dout        : OUT std_logic_VECTOR(C_ASYNFIFO_WIDTH-1 downto 0);
          pempty      : OUT std_logic;
          empty       : OUT std_logic;
 
          data_count  : OUT std_logic_VECTOR(C_EMU_FIFO_DC_WIDTH-1 downto 0);
          rst         : IN  std_logic
          );
end entity FIFO_wrapper;
 
 
architecture Behavioral of FIFO_wrapper is
 
  ---  16384 x 72
  component eb_fifo
    port (
      wr_clk      : IN  std_logic;
      wr_en       : IN  std_logic;
      din         : IN  std_logic_VECTOR(C_ASYNFIFO_WIDTH-1 downto 0);
      prog_full   : OUT std_logic;
      full        : OUT std_logic;
 
      rd_clk      : IN  std_logic;
      rd_en       : IN  std_logic;
      dout        : OUT std_logic_VECTOR(C_ASYNFIFO_WIDTH-1 downto 0);
      prog_empty  : OUT std_logic;
      empty       : OUT std_logic;
 
      rst         : IN  std_logic
      );
  end component;
 
  ---  16384 x 72, with data count synchronized to rd_clk
  component eb_fifo_counted
    port (
      wr_clk      : IN  std_logic;
      wr_en       : IN  std_logic;
      din         : IN  std_logic_VECTOR(C_ASYNFIFO_WIDTH-1 downto 0);
      prog_full   : OUT std_logic;
      full        : OUT std_logic;
 
      rd_clk      : IN  std_logic;
      rd_en       : IN  std_logic;
      dout        : OUT std_logic_VECTOR(C_ASYNFIFO_WIDTH-1 downto 0);
      prog_empty  : OUT std_logic;
      empty       : OUT std_logic;
      rd_data_count  : OUT std_logic_VECTOR(C_EMU_FIFO_DC_WIDTH-1 downto 0);
 
      rst         : IN  std_logic
      );
  end component;
 
  signal data_count_wire    : std_logic_VECTOR(C_EMU_FIFO_DC_WIDTH-1 downto 0);
  signal data_count_i       : std_logic_VECTOR(C_EMU_FIFO_DC_WIDTH-1 downto 0);
 
begin
 
  data_count     <= data_count_i;
 
  --  ------------------------------------------
  Syn_EB_FIFO_data_count:
  process (rd_clk)
  begin
    if rd_clk'event and rd_clk = '1' then
       data_count_i    <= data_count_wire;
    end if;
  end process;
 
  --  ------------------------------------------
  U0:
  eb_fifo_counted
    port map (
         wr_clk     => wr_clk   ,
         wr_en      => wr_en    ,
         din        => din      ,
         prog_full  => pfull    ,
         full       => full     ,
 
         rd_clk     => rd_clk   ,
         rd_en      => rd_en    ,
         dout       => dout     ,
         prog_empty => pempty   ,
         empty      => empty    ,
         rd_data_count  =>  data_count_wire  ,
 
         rst        => rst      
         );
 
end architecture Behavioral;