| Line 17... |
Line 17... |
-- Dependencies:
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-- Dependencies:
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--
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--
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-- Revision:
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-- Revision:
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-- Revision 0.01 - File Created
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-- Revision 0.01 - File Created
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-- Revision 0.02 - Improved error handling
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-- Revision 0.02 - Improved error handling
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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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| Line 58... |
Line 59... |
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-- state variables
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-- state variables
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signal rx_state : rx_state_type;
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signal rx_state : rx_state_type;
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signal rx_count : unsigned (15 downto 0);
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signal rx_count : unsigned (15 downto 0);
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signal src_ip : std_logic_vector (31 downto 0); -- src IP captured from input
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signal src_ip : std_logic_vector (31 downto 0); -- src IP captured from input
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signal dst_ip : std_logic_vector (23 downto 0); -- 1st 3 bytes of dst IP captured from input
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signal is_broadcast_reg : std_logic;
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signal protocol : std_logic_vector (7 downto 0); -- src protocol captured from input
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signal protocol : std_logic_vector (7 downto 0); -- src protocol captured from input
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signal data_len : std_logic_vector (15 downto 0); -- src data length captured from input
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signal data_len : std_logic_vector (15 downto 0); -- src data length captured from input
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signal ip_rx_start_reg : std_logic; -- indicates start of user data
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signal ip_rx_start_reg : std_logic; -- indicates start of user data
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signal hdr_valid_reg : std_logic; -- indicates that hdr data is valid
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signal hdr_valid_reg : std_logic; -- indicates that hdr data is valid
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signal frame_err_cnt : unsigned (7 downto 0); -- number of frame errors
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signal frame_err_cnt : unsigned (7 downto 0); -- number of frame errors
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| Line 71... |
Line 74... |
-- rx control signals
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-- rx control signals
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signal next_rx_state : rx_state_type;
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signal next_rx_state : rx_state_type;
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signal set_rx_state : std_logic;
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signal set_rx_state : std_logic;
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signal rx_event : rx_event_type;
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signal rx_event : rx_event_type;
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signal rx_count_mode : settable_count_mode_type;
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signal rx_count_mode : settable_count_mode_type;
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signal set_dst_ip3 : std_logic;
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signal set_dst_ip2 : std_logic;
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signal set_dst_ip1 : std_logic;
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signal set_ip3 : std_logic;
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signal set_ip3 : std_logic;
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signal set_ip2 : std_logic;
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signal set_ip2 : std_logic;
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signal set_ip1 : std_logic;
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signal set_ip1 : std_logic;
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signal set_ip0 : std_logic;
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signal set_ip0 : std_logic;
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signal set_protocol : std_logic;
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signal set_protocol : std_logic;
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| Line 87... |
Line 93... |
signal rx_count_val : unsigned (15 downto 0);
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signal rx_count_val : unsigned (15 downto 0);
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signal set_error_code : std_logic;
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signal set_error_code : std_logic;
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signal error_code_val : std_logic_vector (3 downto 0);
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signal error_code_val : std_logic_vector (3 downto 0);
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signal set_pkt_cnt : count_mode_type;
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signal set_pkt_cnt : count_mode_type;
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signal set_data_last : std_logic;
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signal set_data_last : std_logic;
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signal dst_ip_rx : std_logic_vector (31 downto 0);
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signal set_is_broadcast : set_clr_type;
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-- IP datagram header format
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-- IP datagram header format
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--
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--
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-- 0 4 8 16 19 24 31
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-- 0 4 8 16 19 24 31
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| Line 130... |
Line 138... |
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rx_combinatorial : process (
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rx_combinatorial : process (
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-- input signals
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-- input signals
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mac_data_in, mac_data_in_valid, mac_data_in_last, our_ip_address,
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mac_data_in, mac_data_in_valid, mac_data_in_last, our_ip_address,
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-- state variables
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-- state variables
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rx_state, rx_count, src_ip, protocol, data_len, ip_rx_start_reg, hdr_valid_reg, frame_err_cnt, error_code_reg, rx_pkt_counter,
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rx_state, rx_count, src_ip, dst_ip, protocol, data_len, ip_rx_start_reg, hdr_valid_reg,
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frame_err_cnt, error_code_reg, rx_pkt_counter, is_broadcast_reg,
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-- control signals
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-- control signals
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next_rx_state, set_rx_state, rx_event, rx_count_mode,
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next_rx_state, set_rx_state, rx_event, rx_count_mode,
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set_ip3, set_ip2, set_ip1, set_ip0, set_protocol, set_len_H, set_len_L,
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set_ip3, set_ip2, set_ip1, set_ip0, set_protocol, set_len_H, set_len_L,
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set_dst_ip3, set_dst_ip2, set_dst_ip1,
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set_ip_rx_start, set_hdr_valid, set_frame_err_cnt, dataval, rx_count_val,
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set_ip_rx_start, set_hdr_valid, set_frame_err_cnt, dataval, rx_count_val,
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set_error_code, error_code_val, set_pkt_cnt, set_data_last
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set_error_code, error_code_val, set_pkt_cnt, set_data_last, dst_ip_rx, set_is_broadcast
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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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ip_rx_start <= ip_rx_start_reg;
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ip_rx_start <= ip_rx_start_reg;
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ip_rx.hdr.is_valid <= hdr_valid_reg;
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ip_rx.hdr.is_valid <= hdr_valid_reg;
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ip_rx.hdr.protocol <= protocol;
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ip_rx.hdr.protocol <= protocol;
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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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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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| Line 168... |
Line 179... |
rx_count_mode <= HOLD;
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rx_count_mode <= HOLD;
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set_ip3 <= '0';
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set_ip3 <= '0';
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set_ip2 <= '0';
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set_ip2 <= '0';
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set_ip1 <= '0';
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set_ip1 <= '0';
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set_ip0 <= '0';
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set_ip0 <= '0';
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set_dst_ip3 <= '0';
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set_dst_ip2 <= '0';
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set_dst_ip1 <= '0';
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set_protocol <= '0';
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set_protocol <= '0';
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set_len_H <= '0';
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set_len_H <= '0';
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set_len_L <= '0';
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set_len_L <= '0';
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set_ip_rx_start <= HOLD;
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set_ip_rx_start <= HOLD;
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set_hdr_valid <= HOLD;
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set_hdr_valid <= HOLD;
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| Line 180... |
Line 194... |
set_error_code <= '0';
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set_error_code <= '0';
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error_code_val <= RX_EC_NONE;
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error_code_val <= RX_EC_NONE;
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set_pkt_cnt <= HOLD;
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set_pkt_cnt <= HOLD;
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dataval <= (others => '0');
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dataval <= (others => '0');
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set_data_last <= '0';
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set_data_last <= '0';
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dst_ip_rx <= (others => '0');
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set_is_broadcast <= HOLD;
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-- determine event (if any)
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-- determine event (if any)
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if mac_data_in_valid = '1' then
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if mac_data_in_valid = '1' then
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rx_event <= DATA;
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rx_event <= DATA;
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dataval <= mac_data_in;
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dataval <= mac_data_in;
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| Line 287... |
Line 303... |
when x"0009" => set_protocol <= '1';
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when x"0009" => set_protocol <= '1';
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when x"000c" => set_ip3 <= '1';
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when x"000c" => set_ip3 <= '1';
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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'; set_hdr_valid <= SET; -- header values are now valid, although the pkt may not be for us
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when x"000f" => set_ip0 <= '1';
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when x"0010" =>
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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) then -- ignore pkts that are not addressed to us
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when x"0011" => set_dst_ip2 <= '1';
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next_rx_state <= WAIT_END;
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when x"0012" => set_dst_ip1 <= '1';
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set_rx_state <= '1';
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end if;
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when x"0011" =>
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if mac_data_in /= our_ip_address(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" =>
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if mac_data_in /= our_ip_address(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) then -- ignore pkts that are not addressed to us
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-- now have the dst IP addr
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next_rx_state <= WAIT_END;
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dst_ip_rx <= dst_ip & mac_data_in;
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set_rx_state <= '1';
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if dst_ip_rx = IP_BC_ADDR then
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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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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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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
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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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next_rx_state <= WAIT_END;
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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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| Line 395... |
Line 406... |
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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rx_count <= x"0000";
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rx_count <= x"0000";
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src_ip <= (others => '0');
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src_ip <= (others => '0');
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dst_ip <= (others => '0');
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protocol <= (others => '0');
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protocol <= (others => '0');
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data_len <= (others => '0');
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data_len <= (others => '0');
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ip_rx_start_reg <= '0';
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ip_rx_start_reg <= '0';
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hdr_valid_reg <= '0';
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hdr_valid_reg <= '0';
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is_broadcast_reg <= '0';
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frame_err_cnt <= (others => '0');
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frame_err_cnt <= (others => '0');
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error_code_reg <= RX_EC_NONE;
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error_code_reg <= RX_EC_NONE;
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rx_pkt_counter <= x"00";
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rx_pkt_counter <= x"00";
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else
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else
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| Line 439... |
Line 452... |
if (set_ip3 = '1') then src_ip(31 downto 24) <= dataval; end if;
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if (set_ip3 = '1') then src_ip(31 downto 24) <= dataval; end if;
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if (set_ip2 = '1') then src_ip(23 downto 16) <= dataval; end if;
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if (set_ip2 = '1') then src_ip(23 downto 16) <= dataval; end if;
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if (set_ip1 = '1') then src_ip(15 downto 8) <= dataval; end if;
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if (set_ip1 = '1') then src_ip(15 downto 8) <= dataval; end if;
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if (set_ip0 = '1') then src_ip(7 downto 0) <= dataval; end if;
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if (set_ip0 = '1') then src_ip(7 downto 0) <= dataval; end if;
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-- dst ip capture
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if (set_dst_ip3 = '1') then dst_ip(23 downto 16) <= dataval; end if;
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if (set_dst_ip2 = '1') then dst_ip(15 downto 8) <= dataval; end if;
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if (set_dst_ip1 = '1') then dst_ip(7 downto 0) <= dataval; end if;
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if (set_protocol = '1') then
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if (set_protocol = '1') then
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protocol <= dataval;
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protocol <= dataval;
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else
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else
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protocol <= protocol;
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protocol <= protocol;
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end if;
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end if;
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| Line 461... |
Line 479... |
when SET => ip_rx_start_reg <= '1';
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when SET => ip_rx_start_reg <= '1';
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when CLR => ip_rx_start_reg <= '0';
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when CLR => ip_rx_start_reg <= '0';
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when HOLD => ip_rx_start_reg <= ip_rx_start_reg;
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when HOLD => ip_rx_start_reg <= ip_rx_start_reg;
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end case;
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end case;
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case set_is_broadcast is
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when SET => is_broadcast_reg <= '1';
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when CLR => is_broadcast_reg <= '0';
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when HOLD => is_broadcast_reg <= is_broadcast_reg;
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end case;
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case set_hdr_valid is
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case set_hdr_valid is
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when SET => hdr_valid_reg <= '1';
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when SET => hdr_valid_reg <= '1';
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when CLR => hdr_valid_reg <= '0';
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when CLR => hdr_valid_reg <= '0';
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when HOLD => hdr_valid_reg <= hdr_valid_reg;
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when HOLD => hdr_valid_reg <= hdr_valid_reg;
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end case;
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end case;
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