SspDecoder8b10b.vhd

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-------------------------------------------------------------------------------
-- File       : SspDecoder8b10b.vhd
-- Company    : SLAC National Accelerator Laboratory
-- Created    : 2014-07-14
-- Last update: 2017-05-01
-------------------------------------------------------------------------------
-- Description: SimpleStreamingProtocol - A simple protocol layer for inserting
-- idle and framing control characters into a raw data stream. This module
-- ties the framing core to an RTL 8b10b encoder.
-------------------------------------------------------------------------------
-- This file is part of 'SLAC Firmware Standard Library'.
-- It is subject to the license terms in the LICENSE.txt file found in the 
-- top-level directory of this distribution and at: 
--    https://confluence.slac.stanford.edu/display/ppareg/LICENSE.html. 
-- No part of 'SLAC Firmware Standard Library', including this file, 
-- may be copied, modified, propagated, or distributed except according to 
-- the terms contained in the LICENSE.txt file.
-------------------------------------------------------------------------------

library ieee;
use ieee.std_logic_1164.all;
use IEEE.STD_LOGIC_UNSIGNED.all;
use IEEE.STD_LOGIC_ARITH.all;

use work.StdRtlPkg.all;
use work.Code8b10bPkg.all;

--! @see entity 
 --! @ingroup protocols_ssp
entity SspDecoder8b10b is

   generic (
      TPD_G          : time    := 1 ns;
      RST_POLARITY_G : sl      := '0';
      RST_ASYNC_G    : boolean := true);

   port (
      clk      : in  sl;
      rst      : in  sl := RST_POLARITY_G;
      dataIn   : in  slv(19 downto 0);
      validIn  : in  sl := '1';
      dataOut  : out slv(15 downto 0);
      validOut : out sl;
      sof      : out sl;
      eof      : out sl;
      eofe     : out sl);

end entity SspDecoder8b10b;

architecture rtl of SspDecoder8b10b is

   signal validDec    : sl;
   signal codeErr     : slv(1 downto 0);
   signal decErr      : sl;
   signal framedData  : slv(15 downto 0);
   signal framedDataK : slv(1 downto 0);

begin

   Decoder8b10b_1 : entity work.Decoder8b10b
      generic map (
         TPD_G          => TPD_G,
         NUM_BYTES_G    => 2,
         RST_POLARITY_G => RST_POLARITY_G,
         RST_ASYNC_G    => RST_ASYNC_G)
      port map (
         clk      => clk,
         rst      => rst,
         validIn  => validIn,
         dataIn   => dataIn,
         dataOut  => framedData,
         dataKOut => framedDataK,
         validOut => validDec,
         codeErr  => codeErr,
         dispErr  => open);

   decErr <= uor(codeErr);

   SspDeframer_1 : entity work.SspDeframer
      generic map (
         TPD_G           => TPD_G,
         RST_POLARITY_G  => RST_POLARITY_G,
         RST_ASYNC_G     => RST_ASYNC_G,
         WORD_SIZE_G     => 16,
         K_SIZE_G        => 2,
         SSP_IDLE_CODE_G => D_10_2_C & K_28_5_C  ,
         SSP_IDLE_K_G    => "01",
         SSP_SOF_CODE_G  => D_10_2_C & K_23_7_C  ,
         SSP_SOF_K_G     => "01",
         SSP_EOF_CODE_G  => D_10_2_C & K_29_7_C  ,
         SSP_EOF_K_G     => "01")
      port map (
         clk      => clk,
         rst      => rst,
         dataIn   => framedData,
         dataKIn  => framedDataK,
         validIn  => validDec,
         decErrIn => decErr,
         dataOut  => dataOut,
         validOut => validOut,
         sof      => sof,
         eof      => eof,
         eofe     => eofe);



end architecture rtl;