Subversion Repositories open_hitter

--////////////////////////////////////////////////////////////////////

--//                                                              ////

--// parse_price.vhd                                              ////

--//                                                              ////

--// This file is part of the open_hitter opencores effort.       ////

--// <http://www.opencores.org/cores/open_hitter/>                ////

--//                                                              ////

--// Module Description:                                          ////

--// Byte stream input, open hitter price output                  ////

--//                                                              ////

--// To Do:                                                       ////

--//    #LOTS                                                     ////

--//                                                              ////

--// Author(s):                                                   ////

--// - Stephen Hawes                                              ////

--//                                                              ////

--////////////////////////////////////////////////////////////////////

--//                                                              ////

--// Copyright (C) 2015 Stephen Hawes and OPENCORES.ORG           ////

--//                                                              ////

--// This source file may be used and distributed without         ////

--// restriction provided that this copyright statement is not    ////

--// removed from the file and that any derivative work contains  ////

--// the original copyright notice and the associated disclaimer. ////

--//                                                              ////

--// This source file is free software; you can redistribute it   ////

--// and/or modify it under the terms of the GNU Lesser General   ////

--// Public License as published by the Free Software Foundation; ////

--// either version 2.1 of the License, or (at your option) any   ////

--// later version.                                               ////

--//                                                              ////

--// This source is distributed in the hope that it will be       ////

--// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

--// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

--// PURPOSE. See the GNU Lesser General Public License for more  ////

--// details.                                                     ////

--//                                                              ////

--// You should have received a copy of the GNU Lesser General    ////

--// Public License along with this source; if not, download it   ////

--// from <http://www.opencores.org/lgpl.shtml>                   ////

--//                                                              ////

--////////////////////////////////////////////////////////////////////

--//

--// \$Id\$  TAKE OUT THE \'s and this comment in order to get this to work

--//

--// CVS Revision History

--//

--// \$Log\$  TAKE OUT THE \'s and this comment in order to get this to work

--//

library ieee;

use ieee.std_logic_1164.all;

entity parse_price is

   port (

        RX_CLK: in std_logic;

        in_byte: in std_logic_vector(7 downto 0);

        byte_reset: in std_logic;

        byte_ready: in std_logic;

        price_ready: out std_logic;

        -- pxdata: out price_packet

           px_type: out std_logic_vector(4 downto 0);

           buy_sell: out std_logic_vector(2 downto 0);   -- 111 buy, 000 sell

           px: out std_logic_vector(15 downto 0);     -- price

           qty: out std_logic_vector(15 downto 0);    -- quantity

           sec: out std_logic_vector(55 downto 0);    -- 7x 8bits securities identifier

           id: out std_logic_vector(15 downto 0)     -- unique/identifier/counter

   );

end parse_price;

architecture parse_price_implementation of parse_price is

   signal infield: std_logic_vector(55 downto 0);

   signal pos: integer range 0 to 14 := 14;

begin

   parse: process (RX_CLK) is

   begin

      if rising_edge(RX_CLK) then

         case pos is

            when 0 =>

                px_type <= in_byte(7 downto 3);

                buy_sell <= in_byte(2 downto 0);

            when 2 =>

                px(15 downto 8) <= infield(7 downto 0);

                px(7 downto 0) <= in_byte;

            when 4 =>

                qty(15 downto 8) <= infield(7 downto 0);

                qty(7 downto 0) <= in_byte;

            when 11 =>

                sec(55 downto 8) <= infield(47 downto 0);

                sec(7 downto 0) <= in_byte;

            when 13 =>

                id(15 downto 8) <= infield(7 downto 0);

                id(7 downto 0) <= in_byte;

                price_ready <= std_logic'('1');

            when others => null;

         end case;

         if (byte_reset = '1') then

            pos <= 0;

         elsif (pos = 14) then

            pos <= 14;

         elsif (byte_ready = '1') then

            pos <= pos+1;

         else

            pos <= pos;

         end if;

         infield(55 downto 8) <= infield(47 downto 0);

         infield(7 downto 0) <= in_byte;

      end if;

   end process parse;

end parse_price_implementation;

-- 2008: can make price packet generic, eg;

--    generic ( type price_packet );

-- type price_packet is record

--    px_type: std_logic_vector(4 downto 0);

--    buy_sell: std_logic_vector(2 downto 0);   -- 111 buy, 000 sell

--    px: std_logic_vector(15 downto 0);     -- price   

--    qty: std_logic_vector(15 downto 0);    -- quantity

--    sec: std_logic_vector(55 downto 0);    -- 7x 8bits securities identifier

--    id: std_logic_vector(15 downto 0);     -- unique/identifier/counter

-- end record price_packet;