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-- Revision 0.03 - Added handling of broadcast address
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-- Revision 0.03 - Added handling of broadcast address
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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.axi.all;
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use work.axi.all;
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use work.ipv4_types.all;
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use work.ipv4_types.all;
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use work.arp_types.all;
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use work.arp_types.all;
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entity IPv4_RX is
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entity IPv4_RX is
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Port (
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port (
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-- IP Layer signals
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-- IP Layer signals
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ip_rx : out ipv4_rx_type;
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ip_rx : out ipv4_rx_type;
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ip_rx_start : out std_logic; -- indicates receipt of ip frame.
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ip_rx_start : out std_logic; -- indicates receipt of ip frame.
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-- system signals
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-- system signals
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clk : in STD_LOGIC; -- same clock used to clock mac data and ip data
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clk : in std_logic; -- same clock used to clock mac data and ip data
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reset : in STD_LOGIC;
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reset : in std_logic;
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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_pkt_count : out STD_LOGIC_VECTOR(7 downto 0); -- number of IP pkts received for us
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rx_pkt_count : out std_logic_vector(7 downto 0); -- number of IP pkts received for us
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-- MAC layer RX signals
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-- MAC layer RX signals
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mac_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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mac_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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mac_data_in_valid : in STD_LOGIC; -- indicates data_in valid on clock
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mac_data_in_valid : in std_logic; -- indicates data_in valid on clock
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mac_data_in_last : in STD_LOGIC -- indicates last data in frame
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mac_data_in_last : in std_logic -- indicates last data in frame
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);
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);
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end IPv4_RX;
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end IPv4_RX;
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architecture Behavioral of IPv4_RX is
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architecture Behavioral of IPv4_RX is
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ip_rx.hdr.data_length <= data_len;
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ip_rx.hdr.data_length <= data_len;
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ip_rx.hdr.src_ip_addr <= src_ip;
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ip_rx.hdr.src_ip_addr <= src_ip;
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ip_rx.hdr.num_frame_errors <= std_logic_vector(frame_err_cnt);
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ip_rx.hdr.num_frame_errors <= std_logic_vector(frame_err_cnt);
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ip_rx.hdr.last_error_code <= error_code_reg;
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ip_rx.hdr.last_error_code <= error_code_reg;
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ip_rx.hdr.is_broadcast <= is_broadcast_reg;
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ip_rx.hdr.is_broadcast <= is_broadcast_reg;
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rx_pkt_count <= STD_LOGIC_VECTOR(rx_pkt_counter);
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rx_pkt_count <= std_logic_vector(rx_pkt_counter);
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-- transfer data upstream if in user data phase
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-- transfer data upstream if in user data phase
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if rx_state = USER_DATA then
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if rx_state = USER_DATA then
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ip_rx.data.data_in <= mac_data_in;
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ip_rx.data.data_in <= mac_data_in;
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ip_rx.data.data_in_valid <= mac_data_in_valid;
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ip_rx.data.data_in_valid <= mac_data_in_valid;
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when x"000d" => set_ip2 <= '1';
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when x"000d" => set_ip2 <= '1';
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when x"000e" => set_ip1 <= '1';
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when x"000e" => set_ip1 <= '1';
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when x"000f" => set_ip0 <= '1';
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when x"000f" => set_ip0 <= '1';
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when x"0010" => set_dst_ip3 <= '1';
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when x"0010" => set_dst_ip3 <= '1';
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if ((mac_data_in /= our_ip_address(31 downto 24)) and
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(mac_data_in /= IP_BC_ADDR(31 downto 24)))then -- ignore pkts that are not addressed to us
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next_rx_state <= WAIT_END;
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set_rx_state <= '1';
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end if;
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when x"0011" => set_dst_ip2 <= '1';
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when x"0011" => set_dst_ip2 <= '1';
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if ((mac_data_in /= our_ip_address(23 downto 16)) and
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(mac_data_in /= IP_BC_ADDR(23 downto 16)))then -- ignore pkts that are not addressed to us
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next_rx_state <= WAIT_END;
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set_rx_state <= '1';
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end if;
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when x"0012" => set_dst_ip1 <= '1';
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when x"0012" => set_dst_ip1 <= '1';
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if ((mac_data_in /= our_ip_address(15 downto 8)) and
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(mac_data_in /= IP_BC_ADDR(15 downto 8)))then -- ignore pkts that are not addressed to us
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next_rx_state <= WAIT_END;
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set_rx_state <= '1';
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end if;
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when x"0013" =>
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when x"0013" =>
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if ((mac_data_in /= our_ip_address(7 downto 0)) and
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(mac_data_in /= IP_BC_ADDR(7 downto 0)))then -- ignore pkts that are not addressed to us
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next_rx_state <= WAIT_END;
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set_rx_state <= '1';
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else
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next_rx_state <= USER_DATA;
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set_pkt_cnt <= INCR; -- count another pkt
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set_rx_state <= '1';
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set_ip_rx_start <= SET;
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end if;
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-- now have the dst IP addr
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-- now have the dst IP addr
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dst_ip_rx <= dst_ip & mac_data_in;
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dst_ip_rx <= dst_ip & mac_data_in;
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if dst_ip_rx = IP_BC_ADDR then
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if dst_ip_rx = IP_BC_ADDR then
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set_is_broadcast <= SET;
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set_is_broadcast <= SET;
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else
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else
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set_is_broadcast <= CLR;
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set_is_broadcast <= CLR;
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end if;
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end if;
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set_hdr_valid <= SET; -- header values are now valid, although the pkt may not be for us
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set_hdr_valid <= SET; -- header values are now valid, although the pkt may not be for us
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if dst_ip_rx = our_ip_address or dst_ip_rx = IP_BC_ADDR then
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--if dst_ip_rx = our_ip_address or dst_ip_rx = IP_BC_ADDR then
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next_rx_state <= USER_DATA;
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-- next_rx_state <= USER_DATA;
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set_pkt_cnt <= INCR; -- count another pkt received
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-- set_pkt_cnt <= INCR; -- count another pkt received
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set_rx_state <= '1';
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-- set_rx_state <= '1';
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set_ip_rx_start <= SET;
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-- set_ip_rx_start <= SET;
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else
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--else
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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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end if;
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--end if;
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when others => -- ignore other bytes in ip header
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when others => -- ignore other bytes in ip header
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end case;
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end case;
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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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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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-- sequential process to action control signals and change states and outputs
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-- sequential process to action control signals and change states and outputs
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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rx_sequential : process (clk,reset)
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rx_sequential : process (clk)--, reset)
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begin
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begin
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if rising_edge(clk) then
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if rising_edge(clk) then
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if reset = '1' then
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if reset = '1' then
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-- reset state variables
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-- reset state variables
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rx_state <= IDLE;
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rx_state <= IDLE;
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