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[/] [open_hitter/] [trunk/] [rtl/] [vhdl/] [search_item.vhd] - Rev 17
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--//////////////////////////////////////////////////////////////////// --// //// --// search_item.vhd //// --// //// --// This file is part of the open_hitter opencores effort. //// --// <http://www.opencores.org/cores/open_hitter/> //// --// //// --// Module Description: //// --// This is the multipelexed search's repeated item. The project //// --// buses perform the multiplex and are experienced by each item //// --// as b1_* - input to search_item //// --// b2_* - output from search_item //// --// this version of search_item is stateless i.e. can be queried //// --// every clock cycle //// --// //// --// To Do: //// --// //// --// 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; use ieee.numeric_std.ALL; --use std.textio.all; -- Imports the standard textio package. entity search_item is generic ( item_id: std_logic_vector(15 downto 0) ); port ( RX_CLK: in std_logic; -- control flag(s) on the incoming bus b1_px_valid: in std_logic; -- pxdata: in price_packet b1_px_type: in std_logic_vector(4 downto 0); b1_buy_sell: in std_logic_vector(2 downto 0); -- 111 buy, 000 sell b1_px: in std_logic_vector(15 downto 0); -- price b1_qty: in std_logic_vector(15 downto 0); -- quantity b1_sec: in std_logic_vector(55 downto 0); -- 7x 8bits securities identifier b1_id: in std_logic_vector(15 downto 0); -- unique/identifier/counter -- pxdata: out price_packet b2_px_type: out std_logic_vector(4 downto 0); b2_buy_sell: out std_logic_vector(2 downto 0); -- 111 buy, 000 sell b2_px: out std_logic_vector(15 downto 0); -- price b2_qty: out std_logic_vector(15 downto 0); -- quantity b2_sec: out std_logic_vector(55 downto 0); -- 7x 8bits securities identifier b2_id: out std_logic_vector(15 downto 0) -- unique/identifier/counter ); end search_item; architecture search_item_implementation of search_item is -- signal state : integer range 0 to 16 := 16; signal requires_reset: std_logic := '0'; -- pxdata: out price_packet signal store_px_type: std_logic_vector(4 downto 0) := (others => 'Z'); signal store_buy_sell: std_logic_vector(2 downto 0) := (others => 'Z'); -- 111 buy, 000 sell signal store_px: std_logic_vector(15 downto 0) := (others => 'Z'); -- price signal store_qty: std_logic_vector(15 downto 0) := (others => 'Z'); -- quantity signal store_sec: std_logic_vector(55 downto 0) := (others => 'Z'); -- 7x 8bits securities identifier begin match: process (RX_CLK) is -- variable l : line; begin if rising_edge(RX_CLK) then -- if falling_edge(RX_CLK) then if b1_px_valid = '1' then -- write (l, String'(" Item Rising Edge ")); -- for j in b1_id'range loop -- write(l, std_logic'image(b1_id(j)) ); -- end loop; -- write (l, String'(" instruction: ")); -- for j in b1_px_type'range loop -- write(l, std_logic'image(b1_px_type(j)) ); -- end loop; -- writeline ( output, l); if b1_px_type = std_logic_vector'("00000") then -- do reset store and outputs store_px_type <= (others => '0'); store_buy_sell <= (others => '0'); -- 111 buy, 000 sell store_px <= (others => '0'); -- price store_qty <= (others => '0'); -- quantity store_sec <= (others => '0'); -- 7x 8bits securities identifier -- b2_px_type <= (others => 'Z'); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter -- requires_reset <= '0'; elsif b1_px_type = std_logic_vector'("00110") then if store_buy_sell = b1_buy_sell and store_sec = b1_sec then -- do set store from incoming price store_px_type <= b1_px_type; -- store_buy_sell <= b1_buy_sell; store_px <= b1_px; store_qty <= b1_qty; -- b2_px_type <= std_logic_vector'(std_logic_vector'("00110")); b2_buy_sell <= (others => 'Z'); b2_px <= (others => 'Z'); b2_qty <= (others => 'Z'); b2_sec <= (others => 'Z'); b2_id <= (others => 'Z'); requires_reset <= '1'; else if requires_reset = '1' then b2_px_type <= (others => 'Z'); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter requires_reset <= '0'; end if; end if; elsif b1_px_type = std_logic_vector'("01010") then if item_id = b1_id then -- do set store and security from incoming price store_px_type <= b1_px_type; store_buy_sell <= b1_buy_sell; store_px <= b1_px; store_qty <= b1_qty; store_sec <= b1_sec; -- b2_px_type <= std_logic_vector'(std_logic_vector'("01010")); b2_buy_sell <= (others => 'Z'); b2_px <= (others => 'Z'); b2_qty <= (others => 'Z'); b2_sec <= (others => 'Z'); b2_id <= item_id; requires_reset <= '1'; else if requires_reset = '1' then b2_px_type <= (others => 'Z'); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter requires_reset <= '0'; end if; end if; elsif b1_px_type = std_logic_vector'("11100") then -- incoming price, register it and start the state machine if (store_sec /= b1_sec or store_buy_sell = b1_buy_sell ) then if requires_reset = '1' then b2_px_type <= (others => 'Z'); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter requires_reset <= '0'; end if; elsif (to_integer(unsigned(store_qty)) = 0 or to_integer(unsigned(b1_qty)) = 0 or (store_buy_sell = std_logic_vector'("111") and store_px < b1_px) or (store_buy_sell = std_logic_vector'("000") and store_px > b1_px) ) then -- no deal: this is the correct store_item but there's no match b2_px_type <= std_logic_vector'(std_logic_vector'("11101")); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter requires_reset <= '1'; else -- send a return order b2_buy_sell <= store_buy_sell; -- 111 buy, 000 sell b2_sec <= store_sec; -- 7x 8bits securities identifier b2_id <= item_id; -- unique/identifier/counter b2_px <= b1_px; -- price -- b2_qty <= if b1_qty < store_qty then b2_qty <= b1_qty; else b2_qty <= store_qty; end if; -- quantity -- update the store -- store_qty if (b1_qty < store_qty) then store_qty <= std_logic_vector(to_unsigned( to_integer(unsigned(store_qty)) - to_integer(unsigned(b1_qty)) ,16 )); else store_qty <= (others => '0'); end if; b2_px_type <= std_logic_vector'(std_logic_vector'("11100")); requires_reset <= '1'; end if; else -- no action if requires_reset = '1' then b2_px_type <= (others => 'Z'); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter requires_reset <= '0'; end if; end if; -- b1_px_type else -- b1_px_valid if requires_reset = '1' then b2_px_type <= (others => 'Z'); b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell b2_px <= (others => 'Z'); -- price b2_qty <= (others => 'Z'); -- quantity b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier b2_id <= (others => 'Z'); -- unique/identifier/counter requires_reset <= '0'; end if; end if; -- b1_px_valid -- b2_id <= std_logic_vector'(X"0000"); -- testing end if; end process match; end search_item_implementation;
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