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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.ALL;
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use ieee.numeric_std.ALL;
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entity search_item is
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entity search_item is
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generic ( item_id: std_logic_vector(15 downto 0) );
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port (
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port (
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RX_CLK: in std_logic;
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RX_CLK: in std_logic;
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-- control flag(s) on the incoming bus
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-- control flag(s) on the incoming bus
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b1_px_valid: in std_logic;
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b1_px_valid: in std_logic;
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-- pxdata: in price_packet
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-- pxdata: in price_packet
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b2_px <= (others => 'Z'); -- price
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b2_px <= (others => 'Z'); -- price
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b2_qty <= (others => 'Z'); -- quantity
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b2_qty <= (others => 'Z'); -- quantity
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b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier
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b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier
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b2_id <= (others => 'Z'); -- unique/identifier/counter
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b2_id <= (others => 'Z'); -- unique/identifier/counter
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--
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--
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b2_px_type <= std_logic_vector'(std_logic_vector'("00000"));
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b2_px_type <= std_logic_vector'("ZZZZZ");
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state <= 8;
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state <= 16;
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elsif b1_px_type = std_logic_vector'("00110") then
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elsif b1_px_type = std_logic_vector'("00110") then
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if store_buy_sell = b1_buy_sell and
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store_sec = b1_sec then
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-- do set store from incoming price
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-- do set store from incoming price
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store_px_type <= b1_px_type;
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store_px_type <= b1_px_type;
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-- store_buy_sell <= b1_buy_sell;
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store_px <= b1_px;
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store_qty <= b1_qty;
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-- store_sec <= b1_sec;
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store_id <= b1_id;
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--
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b2_px_type <= std_logic_vector'(std_logic_vector'("00110"));
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state <= 8;
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end if;
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elsif b1_px_type = std_logic_vector'("01010") then
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if item_id = b1_id then
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-- do set store and security from incoming price
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store_px_type <= b1_px_type;
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store_buy_sell <= b1_buy_sell;
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store_buy_sell <= b1_buy_sell;
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store_px <= b1_px;
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store_px <= b1_px;
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store_qty <= b1_qty;
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store_qty <= b1_qty;
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store_sec <= b1_sec;
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store_sec <= b1_sec;
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store_id <= b1_id;
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store_id <= b1_id;
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--
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--
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b2_px_type <= std_logic_vector'(std_logic_vector'("00000"));
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b2_px_type <= b1_px_type;
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b2_id <= item_id;
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state <= 8;
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state <= 8;
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end if;
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elsif b1_px_type = std_logic_vector'("0101") then
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elsif b1_px_type = std_logic_vector'("11100") then
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-- incoming price, register it and start the state machine
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-- incoming price, register it and start the state machine
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if (store_sec /= b1_sec or store_buy_sell = b1_buy_sell or store_px_type /= std_logic_vector'(std_logic_vector'("0110")) ) then
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if (store_sec /= b1_sec or store_buy_sell = b1_buy_sell ) then
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-- not this store_item instance no action, also stop anything that might be going on
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-- not this store_item instance no action
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state <= 14;
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null;
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elsif (to_integer(unsigned(store_qty)) = 0 or to_integer(unsigned(b1_qty)) = 0 or
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elsif (to_integer(unsigned(store_qty)) = 0 or to_integer(unsigned(b1_qty)) = 0 or
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(store_buy_sell = std_logic_vector'("111") and store_px < b1_px) or
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(store_buy_sell = std_logic_vector'("111") and store_px < b1_px) or
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(store_buy_sell = std_logic_vector'("000") and store_px > b1_px) ) then
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(store_buy_sell = std_logic_vector'("000") and store_px > b1_px) ) then
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-- no deal: this is the correct store_item but there's no match
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-- no deal: this is the correct store_item but there's no match
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b2_px_type <= std_logic_vector'(std_logic_vector'("00000"));
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b2_px_type <= std_logic_vector'(std_logic_vector'("11101"));
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state <= 8;
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else
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else
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-- send a return order
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-- send a return order
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b2_px_type <= std_logic_vector'("1010");
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b2_buy_sell <= store_buy_sell; -- 111 buy, 000 sell
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b2_buy_sell <= store_buy_sell; -- 111 buy, 000 sell
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b2_sec <= store_sec; -- 7x 8bits securities identifier
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b2_id <= store_id; -- unique/identifier/counter
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b2_px <= b1_px; -- price
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b2_px <= b1_px; -- price
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-- b2_qty <=
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-- b2_qty <=
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if b1_qty < store_qty then
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if b1_qty < store_qty then
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b2_qty <= b1_qty;
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b2_qty <= b1_qty;
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else
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else
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b2_qty <= store_qty;
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b2_qty <= store_qty;
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end if; -- quantity
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end if; -- quantity
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b2_sec <= store_sec; -- 7x 8bits securities identifier
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b2_id <= store_id; -- unique/identifier/counter
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-- update the store
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-- update the store
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-- store_qty
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-- store_qty
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if (b1_qty < store_qty) then
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if (b1_qty < store_qty) then
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store_qty <= std_logic_vector(to_unsigned( to_integer(unsigned(store_qty)) - to_integer(unsigned(b1_qty)) ,16 ));
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store_qty <= std_logic_vector(to_unsigned( to_integer(unsigned(store_qty)) - to_integer(unsigned(b1_qty)) ,16 ));
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else
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else
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store_qty <= (others => '0');
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store_qty <= (others => '0');
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state <= 1;
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end if;
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end if;
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b2_px_type <= std_logic_vector'(std_logic_vector'("11100"));
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end if;
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end if;
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state <= 8;
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else
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else
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-- no action
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-- no action
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null;
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null;
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end if; -- b1_px_type
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end if; -- b1_px_type
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else -- b1_px_valid
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else -- b1_px_valid
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-- no incoming b1_px so check for state machine actions
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-- no incoming b1_px so check for state machine actions
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case state is
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case state is
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when 1 =>
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when 8 =>
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-- sent return order, so clean up
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-- sent return order, so clean up
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b2_px_type <= (others => 'Z');
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b2_px_type <= (others => 'Z');
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b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell
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b2_buy_sell <= (others => 'Z'); -- 111 buy, 000 sell
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b2_px <= (others => 'Z'); -- price
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b2_px <= (others => 'Z'); -- price
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b2_qty <= (others => 'Z'); -- quantity
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b2_qty <= (others => 'Z'); -- quantity
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b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier
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b2_sec <= (others => 'Z'); -- 7x 8bits securities identifier
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b2_id <= (others => 'Z'); -- unique/identifier/counter
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b2_id <= (others => 'Z'); -- unique/identifier/counter
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state <= 16;
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--
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when 8 =>
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-- correct store_item but there was no match
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b2_px_type <= std_logic_vector'("ZZZZZ");
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b2_px_type <= std_logic_vector'("ZZZZZ");
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state <= 16;
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state <= 16;
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when others => null;
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when others => null;
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end case; -- state
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end case; -- state
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