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-- Revision 0.01 - File Created - refactored from arp v0.02 module
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-- Revision 0.01 - File Created - refactored from arp v0.02 module
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-- Additional Comments:
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-- Additional Comments:
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--
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--
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----------------------------------------------------------------------------------
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----------------------------------------------------------------------------------
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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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use work.arp_types.all;
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use work.arp_types.all;
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entity arp_rx is
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entity arp_rx is
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Port (
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port (
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-- MAC layer RX signals
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-- MAC layer RX signals
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data_in : in STD_LOGIC_VECTOR (7 downto 0); -- ethernet frame (from dst mac addr through to last byte of frame)
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data_in : in std_logic_vector (7 downto 0); -- ethernet frame (from dst mac addr through to last byte of frame)
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data_in_valid : in STD_LOGIC; -- indicates data_in valid on clock
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data_in_valid : in std_logic; -- indicates data_in valid on clock
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data_in_last : in STD_LOGIC; -- indicates last data in frame
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data_in_last : in std_logic; -- indicates last data in frame
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-- ARP output signals
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-- ARP output signals
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recv_who_has : out std_logic; -- pulse will be latched
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recv_who_has : out std_logic; -- pulse will be latched
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arp_entry_for_who_has : out arp_entry_t; -- target for who_has msg (Iie, who to reply to)
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arp_entry_for_who_has : out arp_entry_t; -- target for who_has msg (Iie, who to reply to)
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recv_I_have : out std_logic; -- pulse will be latched
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recv_I_have : out std_logic; -- pulse will be latched
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arp_entry_for_I_have : out arp_entry_t; -- arp target for I_have msg
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arp_entry_for_I_have : out arp_entry_t; -- arp target for I_have msg
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-- control and status signals
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-- control and status signals
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req_count : out STD_LOGIC_VECTOR(7 downto 0); -- count of arp pkts received
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req_count : out std_logic_vector(7 downto 0); -- count of arp pkts received
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-- system signals
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-- system signals
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our_ip_address : in STD_LOGIC_VECTOR (31 downto 0);
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our_ip_address : in std_logic_vector (31 downto 0);
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rx_clk : in std_logic;
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rx_clk : in std_logic;
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reset : in STD_LOGIC
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reset : in std_logic
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);
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);
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end arp_rx;
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end arp_rx;
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architecture Behavioral of arp_rx is
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architecture Behavioral of arp_rx is
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-- Hardware Length /= 6
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-- Hardware Length /= 6
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-- Protocol Length /= 4
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-- Protocol Length /= 4
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-- Operation /= 1 or 2
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-- Operation /= 1 or 2
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-- Target IP /= our IP (i.er. message is not meant for us)
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-- Target IP /= our IP (i.er. message is not meant for us)
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--
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--
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function not_our_arp(data : STD_LOGIC_VECTOR; count : unsigned; our_ip : std_logic_vector) return std_logic is
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function not_our_arp(data : std_logic_vector; count : unsigned; our_ip : std_logic_vector) return std_logic is
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begin
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begin
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if
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if
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(count = 12 and data /= x"08") or -- PDU type 0806 : ARP
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(count = 12 and data /= x"08") or -- PDU type 0806 : ARP
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(count = 13 and data /= x"06") or
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(count = 13 and data /= x"06") or
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(count = 14 and data /= x"00") or -- HW type 1 : eth
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(count = 14 and data /= x"00") or -- HW type 1 : eth
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dataval,set_mac5,set_mac4,set_mac3,set_mac2,set_mac1,set_mac0,set_ip3,set_ip2,set_ip1,set_ip0, set_err_data,
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dataval,set_mac5,set_mac4,set_mac3,set_mac2,set_mac1,set_mac0,set_ip3,set_ip2,set_ip1,set_ip0, set_err_data,
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count_arp_rcvd
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count_arp_rcvd
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)
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)
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begin
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begin
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-- set output followers
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-- set output followers
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req_count <= STD_LOGIC_VECTOR(arp_req_count);
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req_count <= std_logic_vector(arp_req_count);
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-- set defaults for combinatorial outputs
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-- set defaults for combinatorial outputs
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recv_who_has <= '0';
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recv_who_has <= '0';
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arp_entry_for_who_has.ip <= (others => '0');
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arp_entry_for_who_has.ip <= (others => '0');
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arp_entry_for_who_has.mac <= (others => '0');
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arp_entry_for_who_has.mac <= (others => '0');
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rx_count_mode <= INCR;
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rx_count_mode <= INCR;
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-- handle early frame termination
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-- handle early frame termination
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if data_in_last = '1' then
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if data_in_last = '1' then
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next_rx_state <= IDLE;
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next_rx_state <= IDLE;
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set_rx_state <= '1';
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set_rx_state <= '1';
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else
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--else
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end if;
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-- check for end of frame. Also, detect and discard if not our frame
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-- check for end of frame. Also, detect and discard if not our frame
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if rx_count = 42 then
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if rx_count = 41 then -- TB 2013-01-14 15:09:45 was 42
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next_rx_state <= PROCESS_ARP;
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next_rx_state <= PROCESS_ARP;
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set_rx_state <= '1';
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set_rx_state <= '1';
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elsif not_our_arp(data_in,rx_count,our_ip_address) = '1' then
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elsif not_our_arp(data_in,rx_count,our_ip_address) = '1' then
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dataval <= data_in;
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dataval <= data_in;
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set_err_data <= '1';
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set_err_data <= '1';
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dataval <= data_in;
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dataval <= data_in;
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elsif rx_count = 31 then
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elsif rx_count = 31 then
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set_ip0 <= '1';
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set_ip0 <= '1';
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dataval <= data_in;
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dataval <= data_in;
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end if;
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end if;
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end if;
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-- end if;
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end case;
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end case;
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when PROCESS_ARP =>
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when PROCESS_ARP =>
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next_rx_state <= WAIT_END;
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next_rx_state <= WAIT_END;
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set_rx_state <= '1';
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set_rx_state <= '1';
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