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

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

--

-- Revision Control Information

--

-- $RCSfile: altera_tse_timing_adapter8.v,v $

-- $Source: /ipbu/cvs/sio/projects/TriSpeedEthernet/src/RTL/MAC/mac/timing_adapter/altera_tse_timing_adapter8.v,v $

--

-- $Revision: #1 $

-- $Date: 2008/08/09 $

-- Check in by : $Author: sc-build $

-- Author      : SKNg

--

-- Project     : Triple Speed Ethernet - 10/100/1000 MAC

--

-- Description : SIMULATION ONLY

--

-- AVALON STREAMING TIMING ADAPTER FOR 8BIT IMPLEMENTATION

-- 

-- ALTERA Confidential and Proprietary

-- Copyright 2006 (c) Altera Corporation

-- All rights reserved

--

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

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

library ieee ;

use ieee.std_logic_1164.all ;

use ieee.std_logic_arith.all ;

use ieee.std_logic_unsigned.all ;

entity loopback_adapter is

port (

  -- Interface: clk                     

  clk                  : in std_logic;

  reset                : in std_logic;

  -- Interface: in

  in_ready              : out std_logic;

  in_valid              : in  std_logic;

  in_data               : in  std_logic_vector (7 downto 0);

  in_startofpacket      : in  std_logic;

  in_endofpacket        : in  std_logic;

  in_error              : in  std_logic_vector(4 downto 0);

  -- Interface: out

  out_ready             : in std_logic;

  out_valid             : out std_logic;

  out_data              : out std_logic_vector (7 downto 0);

  out_startofpacket     : out std_logic;

  out_endofpacket       : out std_logic;

  out_error             : out std_logic

);

end loopback_adapter;

architecture Behav of loopback_adapter is

   -- Component instantiated by Turbo autoplace on 20/02/2008 at 23:58:54

   COMPONENT loopback_adapter_fifo

        generic (

          DEPTH      : integer := 2048;

          DATA_WIDTH : integer := 11;

          ADDR_WIDTH : integer := 11

        );

         PORT

         (

                 clk            :       IN  STD_LOGIC;

                 reset          :       IN  STD_LOGIC;

                 in_valid   :   in  std_logic;

                 in_data    :   in  std_logic_vector(10 downto 0);

                 out_ready      :       IN  STD_LOGIC;

                 in_ready       :       out  STD_LOGIC;

                 out_valid  :   out  std_logic;

                 out_data   :   out  std_logic_vector(10 downto 0);

                 fill_level :   out  std_logic_vector(11 downto 0)

         );

   END COMPONENT;

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

   --| Signal Declarations

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

   signal in_payload    : std_logic_vector(10 downto 0);

   signal out_payload   : std_logic_vector(10 downto 0);

   signal in_ready_wire : std_logic;

   signal out_valid_wire: std_logic;

   signal fifo_fill     : std_logic_vector(11 downto 0);

   signal ready         : std_logic;

   signal in_err        : std_logic;

begin

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

   --| Payload Mapping

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

   process (in_data,in_startofpacket,in_endofpacket,in_error,out_payload)

   begin

     in_err <= in_error(0) or in_error(1) or in_error(2) or in_error(3) or in_error(4);

     in_payload <= in_data & in_startofpacket & in_endofpacket & in_err;

     out_data           <= out_payload(10 downto 3);

     out_startofpacket  <= out_payload(2);

     out_endofpacket    <= out_payload(1);

     out_error          <= out_payload(0);

   end process;

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

   --| FIFO

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

   u_loopback_fifo: loopback_adapter_fifo

   port map

     (

       clk       => clk,

       reset     => reset,

       in_ready  => open,

       in_valid  => in_valid,

       in_data   => in_payload,

       out_ready => ready,

       out_valid => out_valid_wire,

       out_data  => out_payload,

       fill_level=> fifo_fill

       );

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

   --| Ready & valid signals.

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

   process (fifo_fill, out_valid_wire, out_ready)

    begin

      if (fifo_fill < 48) then

        in_ready <= '1';

      else

        in_ready <= '0';

      end if;

      out_valid <= out_valid_wire;

      ready <= out_ready;

   end process;

end behav;