library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; use work.math_pkg.all; use work.rtps_package.all; use work.user_config.all; use work.rtps_config_package.all; -- TODO: Initialise RAM to zeroes -- TODO: Skip Packet while we are waiting for memory operation to complete -- TODO: add_res is still valid after removal. So we could continue searching the next orphan endpoint from that address on -- TODO: is it really necessary to process Sequence Numbers in sequence? Could we not just accept any higher Sequence Number? entity rtps_builtin_endpoint is port ( clk : in std_logic; -- Input Clock reset : in std_logic; -- Synchronous Reset empty : in std_logic; -- Input FIFO empty flag rd : out std_logic; -- Input FIFO read signal data_in : in std_logic_vector(WORD_WIDTH-1 downto 0); -- Input FIFO data signal data_out : out std_logic_vector(WORD_WIDTH-1 downto 0); last_word_in : in std_logic; time : in TIME_TYPE; endpoint_full : in std_logic_vector(0 to NUM_ENDPOINTS-1); endpoint_wr : out std_logic_vector(0 to NUM_ENDPOINTS-1); rtps_wr : out std_logic; rtps_full : in std_logic; last_word_out : out std_logic; alive : in std_logic_vector(0 to NUM_ENDPOINTS-1) ); end entity; architecture arch of rtps_builtin_endpoint is --*****COMPONENT DECLARATION****** -- The RAM is used for storing remote Participant and Endpoint Data. -- Participant Data is stored from low to high and Endpoint Data is stored from high to low. -- The RAM should have a READ and WRITE latency of 1 clock cycle. component single_port_ram is generic ( ADDR_WIDTH : natural := 8; DATA_WIDTH : natural := 12; MEMORY_DEPTH : natural := 256 ); port ( clk : in std_logic; addr : in std_logic_vector(ADDR_WIDTH-1 downto 0); wen : in std_logic; ren : in std_logic; wr_data : in std_logic_vector(DATA_WIDTH-1 downto 0); rd_data : out std_logic_vector(DATA_WIDTH-1 downto 0) ); end component; --*****CONSTANT DECLARATION***** -- Width of extra_flags signal constant EXTRA_FLAGS_WIDTH : natural := 4; --*****TYPE DECLARATION***** -- FSM states. Explained below in detail type STAGE_TYPE is (IDLE, PACKET_HEADER, PACKET_SRC_ADDR, PACKET_SRC_ENTITYID, PACKET_SRC_GUIDPREFIX, PACKET_DEST_ENTITYID, CHECK_SRC_ENTITYID, LATCH_SEQ_NR, PROCESS_DATA, PROCESS_MESSAGE, PROCESS_GAP, PROCESS_GAP_SEQUENCE_NUMBERS, PROCESS_PL, CHECK_DEFAULT, LATCH_STRING_LENGTH, COMPARE_STRING, RXO_DURABILITY, RXO_DEADLINE, RXO_LIVELINESS, RXO_LEASE_DURATION, LATCH_LEASE_DURATION, RXO_RELIABILITY, RXO_DESTINATION_ORDER, RXO_OWNERSHIP, RXO_PRESENTATION, RXO_PARTITION, RXO_LATENCY_BUDGET, CHECK_MAX_SIZE_SERIALIZED, MATCH_DOMAIN_ID, MATCH_PROTOCOL_VERSION, LATCH_LOCATOR, LATCH_EXPECTS_INLINE_QOS, MATCH_GUID, CHECK_REMOTE_BUILTIN_ENDPOINTS, PARTICIPANT_MATCH_STAGE, INFORM_ENDPOINTS_MATCH, INFORM_ENDPOINTS_UNMATCH, INFORM_ENDPOINTS_PARTICIPANT_UNMATCH, PARTICIPANT_STALE_CHECK, LATCH_REMOVED_GUIDPREFIX, PROCESS_HEARTBEAT, PROCESS_HEARTBEAT_SEQUENCE_NUMBERS, SEND_ACKNACK, SEND_HEARTBEAT, PROCESS_ACKNACK, PROCESS_ACKNACK_SEQUENCE_NUMBERS, FIND_PARTICIPANT_DEST, SEND_HEADER, SEND_PARTICIPANT_ANNOUNCEMENT, SEND_PUB_DATA, SEND_SUB_DATA, SEND_MES_MAN_LIVE, SEND_MES_GAP, SEND_MES_AUTO_LIVE, LIVELINESS_UPDATE, SKIP_PARAMETER, SKIP_PACKET); -- Memory FSM states. Explained below in detail type MEM_STAGE_TYPE is (IDLE, SEARCH_PARTICIPANT, GET_PARTICIPANT_DATA, REMOVE_PARTICIPANT, FIND_PARTICIPANT_SLOT, INSERT_PARTICIPANT, FIND_NEXT_PARTICIPANT, FIND_STALE_PARTICIPANT, UPDATE_PARTICIPANT); -- Memory FSM Opcodes -- OPCODE DESCRIPTION -- SEARCH_PARTICIPANT Search memory for Participant Entry with GUID Prefix equal to "guid" signal. -- Set "addr_res" signal to Base Address of found Participant Entry or MAX Address if nothing found. -- "mem_participant_data" contains memory Participant Data. -- INSERT_PARTICIPANT Write Participant Data (contained in latches) to first empty Participant Slot. -- UPDATE_PARTICIPANT Update the Participant Data of the Participant Entry pointed in "addr_res" according to the "update_participant_flags" flags. -- REMOVE_PARTICIPANT Remove the Participant Entry pointed in "addr_res". -- FIND_STALE_PARTICIPANT Find first Participant Entry with expired times (Lease Deadline, HEARTBEAT/ACKNACK Response/Suppression Timeout). -- Set "addr_res" signal to Base Address of found Participant Entry or MAX Address if nothing found. -- FIND_FIRST_PATICIPANT Find first occupied Participant Entry in memory. -- Set "addr_res" signal to Base Address of found Participant Entry or MAX Address if nothing found. -- FIND_NEXT_PARTICIPANT Find next occupied Participant Entry in memory from the Participant Entry pointed by "addr_res". -- Set "addr_res" signal to Base Address of found Participant Entry or MAX Address if nothing found. type MEM_OPCODE_TYPE is (NOP, SEARCH_PARTICIPANT, SEARCH_ENDPOINT, INSERT_PARTICIPANT, INSERT_ENDPOINT, UPDATE_PARTICIPANT, REMOVE_PARTICIPANT, REMOVE_ENDPOINT, FIND_STALE_PARTICIPANT, FIND_FIRST_PATICIPANT, FIND_NEXT_PARTICIPANT); -- RTPS Data Submessage Content: -- * PDP Simple Participant Discovery Protocol Data -- * EDP Simple Endpoint Discovery Protocol Data -- * MESSAGE Participant Message Data type MESSAGE_TYPE_TYPE is (NONE, PDP, EDP, MESSAGE); -- String Content type STRING_CONTENT_TYPE is (TOPIC_NAME_TYPE, TYPE_NAME_TYPE, DOMAIN_TAG_TYPE); -- Record of all Participant Data stored in memory type PARTICIPANT_DATA_TYPE is record meta_addr : std_logic_vector(IPv4_ADDRESS_WIDTH-1 downto 0); def_addr : std_logic_vector(IPv4_ADDRESS_WIDTH-1 downto 0); meta_port : std_logic_vector(UDP_PORT_WIDTH-1 downto 0); def_port : std_logic_vector(UDP_PORT_WIDTH-1 downto 0); extra_flags : std_logic_vector(EXTRA_FLAGS_WIDTH-1 downto 0); lease_duration : DURATION_TYPE; lease_deadline : TIME_TYPE; heartbeat_res_time : TIME_TYPE; acknack_res_time : TIME_TYPE; spdp_seq_nr : SEQUENCENUMBER_TYPE; pub_seq_nr : SEQUENCENUMBER_TYPE; sub_seq_nr : SEQUENCENUMBER_TYPE; mes_seq_nr : SEQUENCENUMBER_TYPE; end record; --*****CONSTANT DECLARATION***** -- Max Serialized Payload Size in a UDP Stream (Bytes) [MAX_PAYLAOD(65536) - IPv4_HEADER(20) - UDP_HEADER(8) - RTPS_HEADER(20) - DATA_HEADER(24)] constant UDP_MAX_SIZE_SERIALIZED : natural := 65464; -- Memory Size in 4-Byte Words constant BUILTIN_BUFFER_SIZE : natural := MAX_REMOTE_PARTICIPANTS*PARTICIPANT_FRAME_SIZE; -- Memory Address Width constant BUILTIN_BUFFER_ADDR_WIDTH : natural := log2c(BUILTIN_BUFFER_SIZE); -- Highest Memory Address constant MAX_ADDRESS : unsigned(BUILTIN_BUFFER_ADDR_WIDTH-1 downto 0) := to_unsigned(BUILTIN_BUFFER_SIZE-1, BUILTIN_BUFFER_ADDR_WIDTH); -- Highest participant Frame Address constant MAX_PARTICIPANT_ADDRESS : unsigned(BUILTIN_BUFFER_ADDR_WIDTH-1 downto 0) := MAX_ADDRESS - PARTICIPANT_FRAME_SIZE + 1; -- Address pointing to the beginning of the first Participant Data Frame constant FIRST_PARTICIPANT_ADDRESS : unsigned(BUILTIN_BUFFER_ADDR_WIDTH-1 downto 0) := (others => '0'); -- *UPDATE PARTICIPANT FLAG POSITIONS* -- Signifies that the main Participant Data are updated constant PARTICIPANT_DATA_FLAG : natural := 0; -- Signifies that the Lease Deadline of the Participant Data is updated constant LEASE_DEADLINE_FLAG : natural := 1; -- Signifies that the Extra Flags of the Participant Data are updated constant EXTRA_FLAGS_FLAG : natural := 2; -- Signifies that the ACKNACK Timeout Time of the Participant Data is updated constant ACKNACK_RES_TIME_FLAG : natural := 3; -- Signifies that the HEARTBEAT Timeout Time of the Participant Data is updated constant HEARTBEAT_RES_TIME_FLAG : natural := 4; -- Signifies that the remote Endpoint (Publisher/Subscriber/Message) Sequence Number of the Participant Data is updated constant EDP_SEQ_NR_FLAG : natural := 5; -- *EXTRA FLAG POSITIONS* -- Signifies that the Publisher Data should be sent constant PUB_DATA_FLAG : natural := 3; -- Signifies that the Subscriber Data should be sent constant SUB_DATA_FLAG : natural := 2; -- Signifies that the Message Data (Liveliness) should be sent constant MES_DATA_FLAG : natural := 1; -- Signifies if the Reader Endpoint expects in-line QoS constant EXPECTS_INLINE_QOS_FLAG : natural := 0; -- Highest Sequence Number of Publisher Data constant PUB_SEQUENCENUMBER : SEQUENCENUMBER_TYPE := convert_to_double_word(to_unsigned(NUM_WRITERS, 64)); -- Highest Sequence Number of Subscriber Data constant SUB_SEQUENCENUMBER : SEQUENCENUMBER_TYPE := convert_to_double_word(to_unsigned(NUM_READERS, 64)); -- Heartbeat/Liveliness Assertion Period constant HEARTBEAT_PERIOD : DURATION_TYPE := work.rtps_package.min(MIN_ENDPOINT_LEASE_DURATION, PARTICIPANT_HEARTBEAT_PERIOD) - DURATION_DELTA; -- *RECV FLAGS* -- Width of the received array constant RCVD_WIDTH : natural := 9; -- Signifies that the DOMAIN_TAG was received constant DOMAIN_TAG_RCVD : natural := 0; -- Signifies that the DURABILITY QoS was received constant DURABILITY_QOS_RCVD_FLAG : natural := 1; -- Signifies that the PRESENTATION QoS was received constant PRESENTATION_QOS_RCVD_FLAG : natural := 2; -- Signifies that the DEADLINE QoS was received constant DEADLINE_QOS_RCVD_FLAG : natural := 3; -- Signifies that the LATENCY_BUDGET QoS was received constant LATENCY_BUDGET_QOS_RCVD_FLAG : natural := 4; -- Signifies that the OWNERSHIP QoS was received constant OWNERSHIP_QOS_RCVD_FLAG : natural := 5; -- Signifies that the LIVELINESS QoS was received constant LIVELINESS_QOS_RCVD_FLAG : natural := 6; -- Signifies that the RELIABILITY QoS was received constant RELIABILITY_QOS_RCVD_FLAG : natural := 7; -- Signifies that the DESTINATION_ORDER QoS was received constant DESTINATION_ORDER_QOS_RCVD_FLAG : natural := 8; -- Constant for zero Participant Data constant ZERO_PARTICIPANT_DATA : PARTICIPANT_DATA_TYPE := ( meta_addr => (others => '0'), def_addr => (others => '0'), meta_port => (others => '0'), def_port => (others => '0'), extra_flags => (others => '0'), lease_duration => (others => (others => '0')), lease_deadline => (others => (others => '0')), heartbeat_res_time => (others => (others => '0')), acknack_res_time => (others => (others => '0')), spdp_seq_nr => (others => (others => '0')), pub_seq_nr => (others => (others => '0')), sub_seq_nr => (others => (others => '0')), mes_seq_nr => (others => (others => '0')) ); --*****SIGNAL DECLARATION***** -- FSM state signal stage, stage_next : STAGE_TYPE := IDLE; -- FSM state latch. Used to transition dynamically to different states from the same state. signal return_stage, return_stage_next : STAGE_TYPE := IDLE; -- Memory FSM State signal mem_stage, mem_stage_next : MEM_STAGE_TYPE := IDLE; -- Intermediate input read signal. (Read from output port not allowed) signal rd_sig : std_logic := '0'; -- Signal used to reset the word counter signal reset_read_cnt : std_logic; -- Word (4-Byte) counter (Counts words read from input fifo) signal read_cnt : unsigned(SUBMESSAGE_LENGTH_WIDTH-3 downto 0) := (others => '0'); -- RTPS Submessage ID Latch signal opcode, opcode_next : std_logic_vector(SUBMESSAGE_ID_WIDTH-1 downto 0) := (others => '0'); -- RTPS Submessage Flags Latch signal flags, flags_next : std_logic_vector(SUBMESSAGE_FLAGS_WIDTH-1 downto 0) := (others => '0'); -- UDPv4 Source Port Latch signal src_port, src_port_next : std_logic_vector(UDP_PORT_WIDTH-1 downto 0) := (others => '0'); -- IPv4 Source Address Latch signal src_addr, src_addr_next : std_logic_vector(IPv4_ADDRESS_WIDTH-1 downto 0) := (others => '0'); -- Source Entity ID Latch signal src_entityid, src_entityid_next : std_logic_vector(ENTITYID_WIDTH-1 downto 0) := (others => '0'); -- Destination Entity ID Latch signal dest_entityid, dest_entityid_next : std_logic_vector(ENTITYID_WIDTH-1 downto 0) := (others => '0'); -- Source GUID Latch signal guid, guid_next : GUID_TYPE := (others => (others => '0')); -- RTPS DATA Submessage Sequence Number Latch signal seq_nr, seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Word aligned End of Parameter signal parameter_end, parameter_end_next : unsigned(PARAMETER_LENGTH_WIDTH-1 downto 0) := (others => '0'); -- RTPS DATA Submessage Content Type signal message_type, message_type_next : MESSAGE_TYPE_TYPE := NONE; -- Data in represented in Big Endian signal data_in_swapped : std_logic_vector(WORD_WIDTH-1 downto 0) := (others => '0'); -- Byte Length of string signal string_length, string_length_next : unsigned(WORD_WIDTH-1 downto 0) := (others => '0'); -- Counter of compared string words (4-Byte) signal compare_length, compare_length_next : unsigned(WORD_WIDTH-3 downto 0) := (others => '0'); -- Bitmask of local Endpoint Matches signal endpoint_mask, endpoint_mask_next : std_logic_vector(0 to NUM_ENDPOINTS-1) := (others => '0'); -- Signifies if the source of the Participant Data is compatible with our Participant signal participant_match, participant_match_next : std_logic := '0'; -- Signifies if the Packet is comming from a Subscriber Endpoint signal is_subscriber, is_subscriber_next : std_logic := '0'; -- Signal storing times for memory operations (Participant Lease Deadline, HEARTBEAT/ACKNACK Response/Suppression Time) signal deadline, deadline_next : TIME_TYPE := (others => (others => '0')); -- Signifies that the read Locator is a Metatraffic Locator signal is_meta_addr, is_meta_addr_next : std_logic := '0'; -- General Purpose counter signal cnt, cnt_next : natural range 0 to max(23, STRING_WORD_ARRAY_TYPE'length) := 0; -- NOTE: In order to avoid synthesizing indexing for the full range of the OUTPUT_DATA_TYPE, we explicitly use counters constrained to the actual size -- Counter used to index the Participant Data signal participant_data_cnt, participant_data_cnt_next : natural range 0 to PARTICIPANT_DATA.length-1 := 0; -- Counter used to index the Publisher Data signal publisher_data_cnt, publisher_data_cnt_next : natural range 0 to work.math_pkg.max(WRITER_ENDPOINT_DATA.length-1, 0) := 0; -- Counter used to index the Subscriber Data signal subscriber_data_cnt, subscriber_data_cnt_next : natural range 0 to work.math_pkg.max(READER_ENDPOINT_DATA.length-1, 0) := 0; -- Signals the start of a Memory Operation (Should be pulled high only when mem_op_done is high) signal mem_op_start : std_logic := '0'; -- Signals the end of a Memory Operation signal mem_op_done : std_logic := '0'; -- Opcode of the Memory Operation (Valid only when mem_op_start is high) signal mem_opcode : MEM_OPCODE_TYPE := NOP; -- Current Memory Address signal mem_addr, mem_addr_next : unsigned(BUILTIN_BUFFER_ADDR_WIDTH-1 downto 0) := (others => '0'); -- Base Memory Address of current Participant/Endpoint Frame signal mem_addr_base, mem_addr_base_next : unsigned(BUILTIN_BUFFER_ADDR_WIDTH-1 downto 0) := (others => '0'); -- Result Base Memory Address of Memory Operation signal addr_res, addr_res_next : unsigned(BUILTIN_BUFFER_ADDR_WIDTH-1 downto 0) := (others => '0'); -- Memory Data Read and Write Signals signal mem_read_data, mem_write_data : std_logic_vector(WORD_WIDTH-1 downto 0) := (others => '0'); -- Memory Read and Write Enable Signals signal mem_rd, mem_wr : std_logic := '0'; -- General Purpose Counter (Memory FSM) signal mem_cnt, mem_cnt_next : natural range 0 to 22 := 0; -- Contains the Sequence Number stored in the Buffer of the current relevant Message Type (Participant/Publisher/Subscriber/Message Data) signal mem_seq_nr, mem_seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Signifies the next expected Sequence Number of the current relevant Message Type (Participant/Publisher/Subscriber/Message Data) signal next_seq_nr, next_seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Latch used to store the first Sequence Number in ACKNACK/HEARTBEAT/GAP Messages signal first_seq_nr, first_seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Latch used to store the last Sequence Number in HEARTBEAT/GAP Messages signal last_seq_nr, last_seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Intermediate write enable signal. signal wr_sig : std_logic := '0'; -- Signifies if we currently are doing a Participant Stale Entry Check (Used to start Stale Checks between packet handling) signal stale_check, stale_check_next : std_logic := '0'; -- Latch containing the GUID Prefix of the removed Participant from the memory, and the Enity ID of the last Orphan Endpoint found signal mem_guidprefix, mem_guidprefix_next : GUIDPREFIX_TYPE := (others => (others => '0')); -- Toggle latching the "last_word_in" signal until reset signal last_word_in_latch, last_word_in_latch_next : std_logic := '0'; -- Flags signifying which parts of the participant Data stored in memory to update signal update_participant_flags, update_participant_flags_next : std_logic_vector(5 downto 0) := (others => '0'); -- Latch for the Participant Data stored in memory signal mem_participant_data, mem_participant_data_next : PARTICIPANT_DATA_TYPE := ZERO_PARTICIPANT_DATA; -- Signifies if the marked Stale Participant had a Hertbeat Response/Suppression Delay Timeout signal is_heartbeat_res, is_heartbeat_res_next : std_logic := '0'; -- Signifies when "mem_seq_nr" and "next_seq_nr" signals are valid signal seq_prc_done, seq_prc_done_next : std_logic := '0'; -- Signal containing the HEARTBEAT/ACKNACK count of all built-in Endpoints signal count, count_next : unsigned(COUNT_WIDTH-1 downto 0) := (others => '0'); -- Toggle set when at least one Endpoint has asserted the "alive" signal, until reset signal endpoint_alive : std_logic := '0'; -- Resets the "endpoint_alive" signal signal reset_endpoint_alive : std_logic := '0'; -- NOTE: The "auto_live_seq_nr" is always higher than "man_live_seq_nr" -- Contains the highest Sequence Number for automatic liveliness updates signal auto_live_seq_nr, auto_live_seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Contains the highest Sequence Number for manual by participant liveliness updates signal man_live_seq_nr, man_live_seq_nr_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Points to the first Sequence Number after "man_live_seq_nr" (Signifies the start of the GAP between "man_live_seq_nr" and "auto_live_seq_nr") signal live_gap_start, live_gap_start_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Points to the first Sequence Number before "auto_live_seq_nr" (Signifies the end of the GAP between "man_live_seq_nr" and "auto_live_seq_nr") signal live_gap_end, live_gap_end_next : SEQUENCENUMBER_TYPE := (others => (others => '0')); -- Participant Announcement Timeout Time signal announcement_time, announcement_time_next : TIME_TYPE := (others => (others => '0')); -- Heartbeat/Liveliness Assertion Timeout Time signal heartbeat_time, heartbeat_time_next : TIME_TYPE := (others => (others => '0')); -- Signifies if we are currently in a Liveliness Assertion signal is_live_assert, is_live_assert_next : std_logic := '0'; -- Signifies the content of the string read from input signal string_content, string_content_next : STRING_CONTENT_TYPE := TOPIC_NAME_TYPE; -- Signifies that the expects_inline_qos Flag was explicitly set via a Parameter ID signal expects_inline_qos_rcv, expects_inline_qos_rcv_next : std_logic := '0'; -- Endpoint Locator IPv4 Address Latch signal def_addr, def_addr_next : std_logic_vector(IPv4_ADDRESS_WIDTH-1 downto 0) := (others => '0'); -- Metatraffic Locator IPv4 Address Latch signal meta_addr, meta_addr_next : std_logic_vector(IPv4_ADDRESS_WIDTH-1 downto 0) := (others => '0'); -- Endpoint UDPv4 Port Latch signal def_port, def_port_next : std_logic_vector(UDP_PORT_WIDTH-1 downto 0) := (others => '0'); -- Metatraffic UDPv4 Port Latch signal meta_port, meta_port_next : std_logic_vector(UDP_PORT_WIDTH-1 downto 0) := (others => '0'); -- Participant Lease Duration Latch signal lease_duration, lease_duration_next : DURATION_TYPE := (others => (others => '0')); -- Extra Flags Latch signal extra_flags, extra_flags_next : std_logic_vector(EXTRA_FLAGS_WIDTH-1 downto 0) := (others => '0'); -- General Purpose Long latch signal long_latch, long_latch_next : std_logic_vector(CDR_LONG_WIDTH-1 downto 0) := (others => '0'); -- Contains flags that signify which PIDs where received. This is done in order to use the default value for -- not received elements. signal rcvd, rcvd_next : std_logic_vector(RCVD_WIDTH-1 downto 0) := (others => '0'); --*****ALIAS DEFINATION***** -- ENDPOINT FRAME HEADER alias header_opcode : std_logic_vector(7 downto 0) is data_in(31 downto 24); alias header_flags : std_logic_vector(7 downto 0) is data_in(23 downto 16); alias header_udp_port : std_logic_vector(15 downto 0) is data_in(15 downto 0); -- RTPS PARAMETER LIST HEADER alias parameter_id : std_logic_vector(15 downto 0) is data_in(31 downto 16); alias parameter_length : std_logic_vector(15 downto 0) is data_in(15 downto 0); alias must_understand : std_logic is parameter_id(14); -- RTPS DATA PAYLOAD HEADER alias representation_id : std_logic_vector(15 downto 0) is data_in(31 downto 16); alias representation_options : std_logic_vector(15 downto 0) is data_in(15 downto 0); -- RTPS SUBMESSAGE FLAGS alias endian_flag : std_logic is flags(0); alias endian_flag_next : std_logic is flags_next(0); alias qos_flag : std_logic is flags(1); alias qos_flag_next : std_logic is flags_next(1); alias data_flag : std_logic is flags(2); alias key_flag : std_logic is flags(3); alias final_flag : std_logic is flags(1); alias payload_flag : std_logic is flags(4); --*****FUNCTION DECLARATION***** begin --*****COMPONENT INSTANTIATION***** ram_inst : single_port_ram generic map ( ADDR_WIDTH => BUILTIN_BUFFER_ADDR_WIDTH, DATA_WIDTH => WORD_WIDTH, MEMORY_DEPTH => BUILTIN_BUFFER_SIZE ) port map ( clk => clk, addr => std_logic_vector(mem_addr), wen => mem_wr, ren => mem_rd, wr_data => mem_write_data, rd_data => mem_read_data ); rd <= rd_sig; -- Big Endian Representation data_in_swapped <= endian_swap(endian_flag, data_in); -- This process is responsible for toggling the "endpoint_alive" signal -- The signal is set high when at least one bit of the "alive" signal is high for at least one clock cycle, -- and is set low when "reset_endpoint_alive" signal is high for at least one clock cycle. endpoint_alive_prc: process(all) begin if rising_edge(clk) then -- Reset Endpoint Alive Signal if (reset = '1' or reset_endpoint_alive = '1') then endpoint_alive <= '0'; -- Set Endpoint Alive Signal, if at least one endpoint asserts liveliness elsif (alive /= (alive'range => '0')) then endpoint_alive <= '1'; end if; end if; end process; -- This process is responsible for setting the "mem_seq_nr" and "next_seq_nr" signals -- The signals are valid as long as "seq_prc_done" is held high. -- It takes one clock cycle after "mem_op_done" is high to set-up the signals seq_nr_prc: process(all) begin -- DEFAULT seq_prc_done_next <= seq_prc_done; mem_seq_nr_next <= mem_seq_nr; next_seq_nr_next <= next_seq_nr; -- Memory Operation Finished if (mem_op_done = '1') then seq_prc_done_next <= '1'; case (message_type) is -- Participant Data Sequence Number when PDP => mem_seq_nr_next <= mem_participant_data.spdp_seq_nr; next_seq_nr_next <= mem_participant_data.spdp_seq_nr + 1; when EDP => -- Subscriber Data Sequence Number if (is_subscriber = '1') then mem_seq_nr_next <= mem_participant_data.sub_seq_nr; next_seq_nr_next <= mem_participant_data.sub_seq_nr + 1; -- Publisher Data Sequence Number else mem_seq_nr_next <= mem_participant_data.pub_seq_nr; next_seq_nr_next <= mem_participant_data.pub_seq_nr + 1; end if; -- Participant Message Data Sequence Number when MESSAGE => mem_seq_nr_next <= mem_participant_data.mes_seq_nr; next_seq_nr_next <= mem_participant_data.mes_seq_nr + 1; when others => null; end case; -- Memory Operation in progress else seq_prc_done_next <= '0'; mem_seq_nr_next <= (others => (others => '0')); next_seq_nr_next <= (others => (others => '0')); end if; end process; -- This process connects the Intermediate Output Signals to the actual output FIFOs output_prc : process(all) begin endpoint_wr <= (others => '0'); rtps_wr <= '0'; case (stage) is when INFORM_ENDPOINTS_MATCH => if (wr_sig = '1') then endpoint_wr <= endpoint_mask; end if; when INFORM_ENDPOINTS_UNMATCH => if (wr_sig = '1') then endpoint_wr <= not endpoint_mask; end if; when INFORM_ENDPOINTS_PARTICIPANT_UNMATCH => if (wr_sig = '1') then endpoint_wr <= (others => '1'); end if; when LIVELINESS_UPDATE => if (wr_sig = '1') then endpoint_wr <= endpoint_mask; end if; when others => rtps_wr <= wr_sig; end case; end process; -- Main State Machine -- STATE DESCRIPTION -- IDLE Idle state. Initiates Participant Announcements, Heartbeat/Liveliness Assertions, Stale Participant Entry Checks ,and Packet Processing, in that priority order. -- PACKET_HEADER Read the Endpoint FIFO Packet Format Header (RTPS Submessage ID/Opcode, Submessage Flags, Source UDPv4 Port) -- PACKET_SRC_ADDR Read Source IPv4 Address -- PACKET_SRC_ENTITYID Read Source Entity ID -- PACKET_SRC_GUIDPREFIX Read Source GUID Prefix -- PACKET_DEST_ENTITYID Read Destination Entity ID. Determine content of Packet (Participant Data, Publisher/Subscriber/Message Data/GAP/HEARTBEAT/ACKNACK) and initiate processing. -- CHECK_SRC_ENTITYID Read Source Entity ID. Determine content of Packet (Participant Data, Publisher/Subscriber/Message Data/GAP/HEARTBEAT/ACKNACK) and initiate processing. -- This state is taken if the Packet content could not be determined in the PACKET_DEST_ENTITYID state. -- LATCH_SEQ_NR Store RTPS Data Submessage Sequence Number -- PROCESS_DATA Parse RTPS Data Submessage Payload Header. Determine content of Data (Parameter List, Participant Message CDR Data) or if Data Message contains in-line QoS and initiate respective handling. -- PROCESS_MESSAGE Parse Participant Data Message and extract liveliness assertion of remote Participant -- LIVELINESS_UPDATE Propagate Liveliness Assertion of remote Participant to respective local Reader Endpoints -- PROCESS_GAP Parse RTPS GAP Submessage -- PROCESS_GAP_SEQUENCE_NUMBERS Process GAP Sequence Numbers. Update stored Sequence Numbers if necessary -- PROCESS_HEARTBEAT Parse RTPS HEARTBEAT Submessage -- PROCESS_HEARTBEAT_SEQUENCE_NUMBERS Process HEARTBEAT Sequence Numbers. Update stored Sequence Numbers if necessary. Set HEARTBEAT response timeout accordingly. -- PROCESS_ACKNACK Parse RTPS ACKNACK Submessage -- PROCESS_ACKNACK_SEQUENCE_NUMBERS Process ACKNACK Sequence Numbers. Update stored Sequence Numbers if necessary. Set ACKNACK response timeout accordingly. -- FIND_PARTICIPANT_DEST Find next stored Participant to send Participant Announcement and Liveliness Assertion to. -- PARTICIPANT_STALE_CHECK Check memory for remote stale Participant Entries (Lease Duration Exceeded, HEARTBEAT/ACKNACK timeout passed) -- LATCH_REMOVED_GUIDPREFIX Store Participant GUID Prefix of removed Participant for Orphan Endpoint Search -- PROCESS_PL Parse RTPS Parameter List -- CHECK_DEFAULT Match local endpoints against non-received QoS (default values) of remote -- LATCH_STRING_LENGTH Store String Length -- COMPARE_STRING Compare string to constants depending on string contents. -- MATCH_GUID Compare GUID Prefix to source GUID Prefix of Packet -- MATCH_DOMAIN_ID Compare Domain ID -- MATCH_PROTOCOL_VERSION Compare RTPS Protocol Version -- LATCH_LOCATOR Store Locator. NOTE: Only Metatraffic and User Locators are differentiated. Unicast and Multicast are overwriting each other and the last parsed is the one to be used. -- LATCH_EXPECTS_INLINE_QOS Store 'expectsInlineQoS' Flag -- LATCH_LEASE_DURATION Store remote Participant Lease Duration -- CHECK_REMOTE_BUILTIN_ENDPOINTS Check if the remote Participant has the required built-in Endpoints -- RXO_DURABILITY Check Compatibility of Durability QoS -- RXO_DEADLINE Check Compatibility of Deadline QoS -- RXO_LIVELINESS Check Compatibility of Liveliness QoS -- RXO_LEASE_DURATION Check Compatibility of Liveliness QoS -- RXO_RELIABILITY Check Compatibility of Reliability QoS -- RXO_DESTINATION_ORDER Check Compatibility of Destination Order QoS -- RXO_OWNERSHIP Check Compatibility of Ownership QoS -- RXO_PRESENTATION Check Compatibility of Presentation QoS -- RXO_PARTITION Check Compatibility of Partition QoS -- RXO_LATENCY_BUDGET Check Compatibility of Latency Budget QoS -- CHECK_MAX_SIZE_SERIALIZED Check if Publishers Max sent Payload Size is Compatible -- PARTICIPANT_MATCH_STAGE Add compatible remote and remove incompatible remote Participants to and from memory. Update stored Sequence Numbers respectively (also for EDP) -- INFORM_ENDPOINTS_MATCH Propagate local Endpoint matches -- INFORM_ENDPOINTS_UNMATCH Propagate local Endpoint unmatches -- INFORM_ENDPOINTS_PARTICIPANT_UNMATCH Propagate remote Participant unmatch -- SEND_HEADER Send Output Data Header and RTPS Message Header -- SEND_PARTICIPANT_ANNOUNCEMENT Send Participant Announcement Data Submessage -- SEND_ACKNACK Send ACKNACK Submessages -- SEND_HEARTBEAT Send HEARTBEAT Submessages -- SEND_PUB_DATA Send Endpoint Discovery Publication Data Submessage -- SEND_SUB_DATA Send Endpoint Discovery Subscriber Data Submessage -- SEND_MES_MAN_LIVE Send Participant Message Automatic Liveliness Assertion Data Submessage -- SEND_MES_GAP Send Participant Message GAP Submessages -- SEND_MES_AUTO_LIVE Send Participant Message Manual-by-Participant Liveliness Assertion Data Submessage -- SKIP_PARAMETER Skip rest of Parameter -- SKIP_PACKET Skip rest of Packet parse_prc: process(all) variable tmp_endpoint_mask : std_logic_vector(0 to NUM_ENDPOINTS-1) := (others => '0'); variable rd_guard : std_logic := '0'; variable tmp_default_qos_match : DEFAULT_QOS_MATCH_TYPE := READER_DEFAULT_QOS_MATCH; begin --DEFAULT Registered stage_next <= stage; return_stage_next <= return_stage; opcode_next <= opcode; flags_next <= flags; src_port_next <= src_port; src_addr_next <= src_addr; guid_next <= guid; src_entityid_next <= src_entityid; dest_entityid_next <= dest_entityid; parameter_end_next <= parameter_end; message_type_next <= message_type; string_length_next <= string_length; compare_length_next <= compare_length; endpoint_mask_next <= endpoint_mask; participant_match_next <= participant_match; is_subscriber_next <= is_subscriber; lease_duration_next <= lease_duration; def_addr_next <= def_addr; meta_addr_next <= meta_addr; def_port_next <= def_port; meta_port_next <= meta_port; is_meta_addr_next <= is_meta_addr; cnt_next <= cnt; expects_inline_qos_rcv_next <= expects_inline_qos_rcv; extra_flags_next <= extra_flags; stale_check_next <= stale_check; first_seq_nr_next <= first_seq_nr; last_seq_nr_next <= last_seq_nr; update_participant_flags_next <= update_participant_flags; deadline_next <= deadline; auto_live_seq_nr_next <= auto_live_seq_nr; man_live_seq_nr_next <= man_live_seq_nr; live_gap_start_next <= live_gap_start; live_gap_end_next <= live_gap_end; announcement_time_next <= announcement_time; heartbeat_time_next <= heartbeat_time; is_live_assert_next <= is_live_assert; string_content_next <= string_content; participant_data_cnt_next <= participant_data_cnt; publisher_data_cnt_next <= publisher_data_cnt; subscriber_data_cnt_next <= subscriber_data_cnt; seq_nr_next <= seq_nr; last_word_in_latch_next <= last_word_in_latch; count_next <= count; long_latch_next <= long_latch; rcvd_next <= rcvd; -- DEFAULT Unregistered rd_sig <= '0'; rd_guard := '0'; reset_read_cnt <= '0'; wr_sig <= '0'; mem_opcode <= NOP; mem_op_start <= '0'; last_word_out <= '0'; reset_endpoint_alive <= '0'; data_out <= (others => '0'); -- Last Word Latch Setter if (last_word_in = '1') then last_word_in_latch_next <= '1'; end if; -- TODO: Reset Latches case(stage) is -- Initial/Idle State when IDLE => -- Participant Announcement Time Trigger if (time > announcement_time) then announcement_time_next <= time + PARTICIPANT_ANNOUNCEMENT_PERIOD; stage_next <= SEND_HEADER; return_stage_next <= SEND_PARTICIPANT_ANNOUNCEMENT; -- Heartbeat Time Trigger -- NOTE: Liveliness assertion and Heartbeat sending is done together elsif (time > heartbeat_time) then -- Memory Operation Guard if (mem_op_done = '1') then -- NOTE: The sequence number of the automatic liveliness is always higher than that of the manual liveliness -- If Manual By Participant Liveliness asserted, send both manual and automatic liveliness if (endpoint_alive = '1') then -- Reset the endpoint alive toggle signal reset_endpoint_alive <= '1'; man_live_seq_nr_next <= auto_live_seq_nr + 1; auto_live_seq_nr_next <= auto_live_seq_nr + 2; -- GAP Start is always man_live_seq_nr+1 live_gap_start_next <= auto_live_seq_nr + 2; -- GAP End is always auto_live_seq_nr-1 live_gap_end_next <= auto_live_seq_nr + 1; -- Else send only automatic liveliness else auto_live_seq_nr_next <= auto_live_seq_nr + 1; live_gap_end_next <= live_gap_end + 1; end if; heartbeat_time_next <= time + HEARTBEAT_PERIOD; -- Send Heartbeat and Liveliness Assertions to all stored Participants mem_opcode <= FIND_FIRST_PATICIPANT; mem_op_start <= '1'; stage_next <= FIND_PARTICIPANT_DEST; -- Increment the counter for the new Heartbeat Messages count_next <= count + 1; -- Mark this as liveliness assertion (Allows the "SEND_MES_AUTO_LIVE" stage to decide on return stage) is_live_assert_next <= '1'; end if; -- Stale Entry search is initiated between every packet processing and when there is no packet to process elsif (stale_check = '0' or empty = '1') then if (mem_op_done = '1') then mem_opcode <= FIND_STALE_PARTICIPANT; mem_op_start <= '1'; -- Stale Check Toggle (Setter) stale_check_next <= '1'; stage_next <= PARTICIPANT_STALE_CHECK; end if; -- Process Packet else -- Stale Check Toggle (Resetter) stale_check_next <= '0'; stage_next <= PACKET_HEADER; -- Reset Latches def_addr_next <= (others => '0'); meta_addr_next <= DEFAULT_IPv4_META_ADDRESS; def_port_next <= (others => '0'); meta_port_next <= META_IPv4_MULTICAST_PORT; lease_duration_next <= DEFAULT_PARTICIPANT_LEASE_DURATION; expects_inline_qos_rcv_next <= '0'; extra_flags_next <= (others => '0'); extra_flags_next(EXPECTS_INLINE_QOS_FLAG) <= DEFAULT_EXPECTS_INLINE_QOS; rcvd_next <= (others => '0'); -- NOTE: We work with a "mark by default, and unmark on first missmatch" System. -- This assumes that each RxO QoS parameter occur only once in the list, else the behavior is undefined. participant_match_next <= '1'; endpoint_mask_next <= (others => '1'); end if; when PACKET_HEADER => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Latch Opcode opcode_next <= header_opcode; -- Latch Flags flags_next <= header_flags; -- Latch Source UDP Port src_port_next <= header_udp_port; stage_next <= PACKET_SRC_ADDR; -- SANITY CHECK: Skip Packet if non-standard Payload if(header_opcode = SID_DATA and payload_flag = '1') then stage_next <= SKIP_PACKET; end if; end if; when PACKET_SRC_ADDR => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Latch Source IP Address src_addr_next <= data_in; stage_next <= PACKET_SRC_ENTITYID; end if; when PACKET_SRC_ENTITYID => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Latch Source Entity ID src_entityid_next <= data_in; stage_next <= PACKET_SRC_GUIDPREFIX; cnt_next <= 0; end if; when PACKET_SRC_GUIDPREFIX => -- Input FIFO Guard and Memory Operation Guard if (empty = '0' and mem_op_done = '1') then rd_guard := '1'; cnt_next <= cnt + 1; -- Latch Src GUIDPrefix case (cnt) is when 0 => guid_next(0) <= data_in; when 1 => guid_next(1) <= data_in; when 2 => guid_next(2) <= data_in; guid_next(3) <= (others => '0'); -- Start Participant Search mem_opcode <= SEARCH_PARTICIPANT; mem_op_start <= '1'; stage_next <= PACKET_DEST_ENTITYID; when others => null; end case; end if; when PACKET_DEST_ENTITYID => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- DEFAULT STAGE stage_next <= SKIP_PACKET; -- *Check Destination Entity ID* case (data_in) is when ENTITYID_UNKNOWN => -- Wildcard Destination -- Content has to be determined through Source Entity ID stage_next <= CHECK_SRC_ENTITYID; when ENTITYID_SPDP_BUILTIN_PARTICIPANT_DETECTOR => -- Only DATA relevant if (opcode = SID_DATA) then -- Packet Contains Participant Data message_type_next <= PDP; stage_next <= LATCH_SEQ_NR; cnt_next <= 0; end if; when ENTITYID_SEDP_BUILTIN_PUBLICATIONS_ANNOUNCER => -- SANITY CHECK: Ignore if no Writers -- Only ACKNACKs are relevant if (NUM_WRITERS /= 0 and opcode = SID_ACKNACK) then message_type_next <= EDP; stage_next <= PROCESS_ACKNACK; --ACKNACK Processing cnt_next <= 0; end if; when ENTITYID_SEDP_BUILTIN_PUBLICATIONS_DETECTOR => -- SANITY CHECK: Ignore if no Readers if (NUM_READERS /= 0) then message_type_next <= EDP; is_subscriber_next <= '0'; -- Only HEARTBEATs, GAPs and DATA are relevant case (opcode) is when SID_HEARTBEAT => stage_next <= PROCESS_HEARTBEAT; -- HEARTBEAT Processing cnt_next <= 0; when SID_GAP => stage_next <= PROCESS_GAP; -- GAP Processing cnt_next <= 0; when SID_DATA => stage_next <= LATCH_SEQ_NR; -- DATA Processing cnt_next <= 0; -- Unmark all Writers endpoint_mask_next <= ENDPOINT_READERS; when others => null; end case; end if; when ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_ANNOUNCER => -- SANITY CHECK: Ignore if no Readers -- Only ACKNACKs are relevant if (NUM_READERS /= 0 and opcode = SID_ACKNACK) then message_type_next <= EDP; stage_next <= PROCESS_ACKNACK; --ACKNACK Processing cnt_next <= 0; end if; when ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_DETECTOR => -- SANITY CHECK: Ignore if no Writers if (NUM_WRITERS /= 0) then message_type_next <= EDP; is_subscriber_next <= '1'; -- Only HEARTBEATs, GAPs and DATA are relevant case (opcode) is when SID_HEARTBEAT => stage_next <= PROCESS_HEARTBEAT; -- HEARTBEAT Processing cnt_next <= 0; when SID_GAP => stage_next <= PROCESS_GAP; -- GAP Processing cnt_next <= 0; when SID_DATA => stage_next <= LATCH_SEQ_NR; -- DATA Processing cnt_next <= 0; -- Unmark all Readers endpoint_mask_next <= not ENDPOINT_READERS; when others => null; end case; end if; when ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_WRITER => -- SANITY CHECK: Ignore if no Writers if (NUM_WRITERS /= 0) then -- Only ACKNACKs are relevant if (opcode = SID_ACKNACK) then message_type_next <= MESSAGE; stage_next <= PROCESS_ACKNACK; --ACKNACK Processing cnt_next <= 0; end if; end if; when ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_READER => -- SANITY CHECK: Ignore if no Readers if (NUM_READERS /= 0) then message_type_next <= MESSAGE; -- Only HEARTBEATs, GAPs and DATA are relevant case (opcode) is when SID_HEARTBEAT => stage_next <= PROCESS_HEARTBEAT; -- HEARTBEAT Processing cnt_next <= 0; when SID_GAP => stage_next <= PROCESS_GAP; -- GAP Processing cnt_next <= 0; when SID_DATA => stage_next <= LATCH_SEQ_NR; -- DATA Processing cnt_next <= 0; -- Unmark all Writers endpoint_mask_next <= ENDPOINT_READERS; when others => null; end case; end if; when others => -- Skip Packet null; end case; end if; when CHECK_SRC_ENTITYID => -- DEFAULT STAGE stage_next <= SKIP_PACKET; -- *Check Dest Entity ID* case (src_entityid) is when ENTITYID_SPDP_BUILTIN_PARTICIPANT_ANNOUNCER => -- Only DATA relevant if (opcode = SID_DATA) then -- Packet Contains Participant Data message_type_next <= PDP; stage_next <= LATCH_SEQ_NR; cnt_next <= 0; end if; when ENTITYID_SEDP_BUILTIN_PUBLICATIONS_DETECTOR => -- SANITY CHECK: Ignore if no Writers -- Only ACKNACKs are relevant if (NUM_WRITERS /= 0 and opcode = SID_ACKNACK) then message_type_next <= EDP; stage_next <= PROCESS_ACKNACK; --ACKNACK Processing cnt_next <= 0; end if; when ENTITYID_SEDP_BUILTIN_PUBLICATIONS_ANNOUNCER => -- SANITY CHECK: Ignore if no Readers if (NUM_READERS /= 0) then message_type_next <= EDP; is_subscriber_next <= '0'; -- Only HEARTBEATs, GAPs and DATA are relevant case (opcode) is when SID_HEARTBEAT => stage_next <= PROCESS_HEARTBEAT; -- HEARTBEAT Processing cnt_next <= 0; when SID_GAP => stage_next <= PROCESS_GAP; -- GAP Processing cnt_next <= 0; when SID_DATA => stage_next <= LATCH_SEQ_NR; -- DATA Processing cnt_next <= 0; -- Unmark all Writers endpoint_mask_next <= ENDPOINT_READERS; when others => null; end case; end if; when ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_DETECTOR => -- SANITY CHECK: Ignore if no Readers -- Only ACKNACKs are relevant if (NUM_READERS /= 0 and opcode = SID_ACKNACK) then message_type_next <= EDP; stage_next <= PROCESS_ACKNACK; --ACKNACK Processing cnt_next <= 0; end if; when ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_ANNOUNCER => -- SANITY CHECK: Ignore if no Writers if (NUM_WRITERS /= 0) then message_type_next <= EDP; is_subscriber_next <= '1'; -- Only HEARTBEATs, GAPs and DATA are relevant case (opcode) is when SID_HEARTBEAT => stage_next <= PROCESS_HEARTBEAT; -- HEARTBEAT Processing cnt_next <= 0; when SID_GAP => stage_next <= PROCESS_GAP; -- GAP Processing cnt_next <= 0; when SID_DATA => stage_next <= LATCH_SEQ_NR; -- DATA Processing cnt_next <= 0; -- Unmark all Readers endpoint_mask_next <= not ENDPOINT_READERS; when others => null; end case; end if; when ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_READER => -- SANITY CHECK: Ignore if no Writers if (NUM_WRITERS /= 0) then -- Only ACKNACKs are relevant if (opcode = SID_ACKNACK) then message_type_next <= MESSAGE; stage_next <= PROCESS_ACKNACK; --ACKNACK Processing cnt_next <= 0; end if; end if; when ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_WRITER => -- SANITY CHECK: Ignore if no Readers if (NUM_READERS /= 0) then message_type_next <= MESSAGE; -- Only HEARTBEATs, GAPs and DATA are relevant case (opcode) is when SID_HEARTBEAT => stage_next <= PROCESS_HEARTBEAT; -- HEARTBEAT Processing cnt_next <= 0; when SID_GAP => stage_next <= PROCESS_GAP; -- GAP Processing cnt_next <= 0; when SID_DATA => stage_next <= LATCH_SEQ_NR; -- DATA Processing cnt_next <= 0; -- Unmark all Writers endpoint_mask_next <= ENDPOINT_READERS; when others => null; end case; end if; when others => null; end case; when LATCH_SEQ_NR => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; -- Latch Sequence Number case (cnt) is when 0 => seq_nr_next(0) <= unsigned(data_in_swapped); when 1 => seq_nr_next(1) <= unsigned(data_in_swapped); stage_next <= PROCESS_DATA; when others => null; end case; end if; when PROCESS_DATA => -- Data Message contains inline QoS if (qos_flag = '1') then stage_next <= PROCESS_PL; -- Data Message contains Data Payload elsif (data_flag = '1') then -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- DEFAULT STAGE stage_next <= SKIP_PACKET; -- Process Payload Header case(representation_id) is when PL_CDR_BE => -- Override Endian Flag endian_flag_next <= '0'; stage_next <= PROCESS_PL; when PL_CDR_LE => -- Override Endian Flag endian_flag_next <= '1'; stage_next <= PROCESS_PL; when CDR_BE => -- Accept CDR Representation only for Participant Messages if (message_type = MESSAGE) then -- Override Endian Flag endian_flag_next <= '0'; stage_next <= PROCESS_MESSAGE; cnt_next <= 0; end if; when CDR_LE => -- Accept CDR Representation only for Participant Messages if (message_type = MESSAGE) then -- Override Endian Flag endian_flag_next <= '1'; stage_next <= PROCESS_MESSAGE; cnt_next <= 0; end if; when others => -- Skip Packet null; end case; end if; end if; when PROCESS_MESSAGE => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is -- Check if GUID Prefix valid (Should be the same as the GUID Prefix of the Packet) -- GUID Prefix 1/3 when 0 => if (data_in /= guid(0)) then stage_next <= SKIP_PACKET; end if; -- GUID Prefix 2/3 when 1 => if (data_in /= guid(1)) then stage_next <= SKIP_PACKET; end if; -- GUID Prefix 3/3 when 2 => if (data_in /= guid(2)) then stage_next <= SKIP_PACKET; end if; -- Participant Mesasge Kind when 3 => -- NOTE: Rest of Participant Message is ignored -- XXX: The Participant Message Data may contain additional data, and according to DDSI-RTPS 2.3 -- implementations must be able to support up to 128 Bytes of additional data. Due to the unnecessary -- high complexity this would add this is not supported. case (data_in) is -- Automatic Liveliness Assertion when PARTICIPANT_MESSAGE_DATA_KIND_AUTOMATIC_LIVELINESS_UPDATE => -- Unmark all readers without automatic liveliness QoS for i in 0 to NUM_READERS-1 loop if (AUTOMATIC_LIVELINESS_QOS /= ENDPOINT_LIVELINESS_QOS(i)) then endpoint_mask_next(i) <= '0'; end if; end loop; stage_next <= LIVELINESS_UPDATE; cnt_next <= 0; -- Manual by Participant Liveliness Assertion when PARTICIPANT_MESSAGE_DATA_KIND_MANUAL_LIVELINESS_UPDATE => -- Unmark all readers without manual by participant liveliness QoS for i in 0 to NUM_READERS-1 loop if (MANUAL_BY_PARTICIPANT_LIVELINESS_QOS /= ENDPOINT_LIVELINESS_QOS(i)) then endpoint_mask_next(i) <= '0'; end if; end loop; stage_next <= LIVELINESS_UPDATE; cnt_next <= 0; -- No Liveliness Update, skip packet when others => stage_next <= SKIP_PACKET; end case; when others => null; end case; end if; when LIVELINESS_UPDATE => -- If no Endpoint interested for Liveliness Assertion, skip if (endpoint_mask = (endpoint_mask'range => '0')) then -- DONE stage_next <= SKIP_PACKET; -- Output FIFO Guard elsif ((endpoint_mask and endpoint_full) = (endpoint_full'range => '0')) then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- Liveliness Assertion Opcode when 0 => data_out <= OPCODE_LIVELINESS_UPDATE; -- GUID Prefix 1/3 when 1 => data_out <= guid(0); -- GUID Prefix 2/3 when 2 => data_out <= guid(1); -- GUID Prefix 3/3 when 3 => data_out <= guid(2); -- DONE stage_next <= SKIP_PACKET; when others => null; end case; end if; when PROCESS_GAP => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; -- Latch Sequence Numbers case (cnt) is when 0 => first_seq_nr_next(0) <= unsigned(data_in_swapped); when 1 => first_seq_nr_next(1) <= unsigned(data_in_swapped); when 2 => last_seq_nr_next(0) <= unsigned(data_in_swapped); when 3 => last_seq_nr_next(1) <= unsigned(data_in_swapped); -- NOTE: Rest of GAP Message is ignored stage_next <= PROCESS_GAP_SEQUENCE_NUMBERS; when others => null; end case; end if; when PROCESS_GAP_SEQUENCE_NUMBERS => -- Wait for Sequence Number to be fetched from buffer if (mem_op_done = '1' and seq_prc_done = '1') then -- Sender known if (addr_res /= MAX_ADDRESS) then -- XXX: This logic relies on the sender marking continuous GAPs with the GAP Start Sequence Number and GAP End Sequence Number Set Base (i.e. the first bit in the bitmask should be 0/not in GAP) -- It also relies on the sender starting the GAP from the next expected/requested sequence number (Not Begining the GAP from an already ACKed sequence number) -- TODO: Couldn't we do something like (first_seq_nr <= seq_nr and last_seq_nr >= next_seq_nr) to also handle the case were the GAP is not begining from the next expected? -- GAP only relevant if GAP start is the next expected sequence number if (first_seq_nr = next_seq_nr) then -- Store GAP end as last sequence number seq_nr_next <= last_seq_nr; mem_opcode <= UPDATE_PARTICIPANT; update_participant_flags_next <= (EDP_SEQ_NR_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; end if; -- DONE stage_next <= SKIP_PACKET; end if; when PROCESS_HEARTBEAT => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; -- Latch Sequence Numbers case (cnt) is when 0 => first_seq_nr_next(0) <= unsigned(data_in_swapped); when 1 => first_seq_nr_next(1) <= unsigned(data_in_swapped); when 2 => last_seq_nr_next(0) <= unsigned(data_in_swapped); when 3 => last_seq_nr_next(1) <= unsigned(data_in_swapped); stage_next <= PROCESS_HEARTBEAT_SEQUENCE_NUMBERS; when others => null; end case; end if; when PROCESS_HEARTBEAT_SEQUENCE_NUMBERS => -- Wait for Participant Search to finish and Next Sequence Number to be set if (mem_op_done = '1' and seq_prc_done = '1') then -- Participant in Buffer if (addr_res /= MAX_ADDRESS) then -- No scheduled Heartbeat Response if (mem_participant_data.heartbeat_res_time /= 0) then -- If current Sequence Number obsolete (removed from source history cache) if (first_seq_nr > next_seq_nr) then -- Store new expected Sequence Number -1 and set Response Dealy seq_nr_next <= first_seq_nr - 1; mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + PARTICIPANT_HEARTBEAT_RESPONSE_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '0'; update_participant_flags_next <= (EDP_SEQ_NR_FLAG => '1', HEARTBEAT_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; -- If new Sequence Number is available or Writer expects ACKNACK elsif (last_seq_nr > mem_seq_nr or final_flag = '0') then -- Set Response Delay mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + PARTICIPANT_HEARTBEAT_RESPONSE_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '0'; update_participant_flags_next <= (HEARTBEAT_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; -- Currently in Heartbeat Response Delay elsif (mem_participant_data.heartbeat_res_time(1)(0) = '0') then -- If current Sequence Number obsolete (removed from source history cache) if (first_seq_nr > next_seq_nr) then -- Store new expected Sequence Number -1 seq_nr_next <= first_seq_nr - 1; mem_opcode <= UPDATE_PARTICIPANT; update_participant_flags_next <= (EDP_SEQ_NR_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; end if; end if; -- DONE stage_next <= SKIP_PACKET; end if; when PROCESS_ACKNACK => if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; -- Latch Sequence Number -- NOTE: Because we always sent the entire history cache, we only need to look at the SequenceNumberSetBase to determine if we need to sent data or not case (cnt) is when 1 => first_seq_nr_next(0) <= unsigned(data_in_swapped); when 2 => first_seq_nr_next(1) <= unsigned(data_in_swapped); stage_next <= PROCESS_ACKNACK_SEQUENCE_NUMBERS; when others => null; end case; end if; when PROCESS_ACKNACK_SEQUENCE_NUMBERS => -- Wait for Participant Search to finish if (mem_op_done = '1') then -- Participant in Buffer if (addr_res /= MAX_ADDRESS) then -- No scheduled Acknack Response if (mem_participant_data.acknack_res_time /= 0) then case (message_type) is when EDP => -- Subscriber Acknack if (is_subscriber = '1') then -- If Reader has not ACKed all Publisher History Cache if (first_seq_nr <= PUB_SEQUENCENUMBER) then -- Set Acknack Response Time and Publisher Data as Acknack Response mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + PARTICIPANT_ACKNACK_RESPONSE_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '0'; extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(PUB_DATA_FLAG) <= '1'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', ACKNACK_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; -- Publisher Acknack else -- If Reader has not ACKed all Subscriber History Cache if (first_seq_nr <= SUB_SEQUENCENUMBER) then -- Set Acknack Response Time and set Subscriber Data as Acknack Response mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + PARTICIPANT_ACKNACK_RESPONSE_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '0'; extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(SUB_DATA_FLAG) <= '1'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', ACKNACK_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; end if; -- Message Acknack when MESSAGE => -- NOTE: "auto_live_seq_nr" always has the higher sequence number by design, so we just need to check against that -- If Reader has not ACKed all Message History Cache if (first_seq_nr <= auto_live_seq_nr) then -- Set Acknack Response Time and set Message Data as Acknack Response mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + PARTICIPANT_ACKNACK_RESPONSE_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '0'; extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(MES_DATA_FLAG) <= '1'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', ACKNACK_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; when others => null; end case; -- Currently in Acknack Response Delay elsif (mem_participant_data.acknack_res_time(1)(0) = '0') then case (message_type) is when EDP => -- Subscriber Acknack if (is_subscriber = '1') then -- Publisher Data not scheduled for response if (mem_participant_data.extra_flags(PUB_DATA_FLAG) = '0') then -- If Reader has not ACKed all Publisher History Cache if (first_seq_nr <= PUB_SEQUENCENUMBER) then -- Set Publisher Data as Acknack Response mem_opcode <= UPDATE_PARTICIPANT; extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(PUB_DATA_FLAG) <= '1'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; end if; -- Publisher Acknack else -- Subscriber Data not scheduled for response if (mem_participant_data.extra_flags(SUB_DATA_FLAG) = '0') then -- If Reader has not ACKed all Subscriber History Cache if (first_seq_nr <= SUB_SEQUENCENUMBER) then -- Set Subscriber Data as Acknack Response mem_opcode <= UPDATE_PARTICIPANT; extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(SUB_DATA_FLAG) <= '1'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; end if; end if; -- Message Acknack when MESSAGE => -- Message Data not scheduled for response if (mem_participant_data.extra_flags(MES_DATA_FLAG) = '0') then -- NOTE: "auto_live_seq_nr" always has the higher sequence number by design, so we just need to -- check against that -- If Reader has not ACKed all Message History Cache if (first_seq_nr <= auto_live_seq_nr) then -- Set Message Data as Acknack Response mem_opcode <= UPDATE_PARTICIPANT; extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(MES_DATA_FLAG) <= '1'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', others => '0'); mem_op_start <= '1'; end if; end if; when others => null; end case; end if; end if; -- DONE stage_next <= SKIP_PACKET; end if; when FIND_PARTICIPANT_DEST => -- Wait for Next Participant to be Fetched if (mem_op_done = '1') then -- No more Participants if (addr_res = MAX_ADDRESS) then -- DONE stage_next <= IDLE; else stage_next <= SEND_HEADER; return_stage_next <= SEND_HEARTBEAT; cnt_next <= 0; end if; end if; when PARTICIPANT_STALE_CHECK => -- Wait for Stale Search to finish if (mem_op_done = '1') then -- Found Stale Entry if (addr_res /= MAX_ADDRESS) then -- Participant Lease Expired -- NOTE: The mem_participant_data is zero initialized on lease expiration, so we check the default address for zero -- (since the default address should always be set) if (mem_participant_data.def_addr /= (mem_participant_data.def_addr'reverse_range => '0')) then -- Remove Participant mem_opcode <= REMOVE_PARTICIPANT; mem_op_start <= '1'; stage_next <= LATCH_REMOVED_GUIDPREFIX; -- Response Time Reached else -- Heartbeat Response if (is_heartbeat_res = '1') then -- If Suppression Delay passed, zero the time if(mem_participant_data.heartbeat_res_time(1)(0) = '1') then -- Zero Heartbeat Response Time mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= (others => (others => '0')); update_participant_flags_next <= (HEARTBEAT_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; -- DONE stage_next <= IDLE; -- If Response Delay Passed else -- Set Heartbeat Suppression Time mem_opcode <= UPDATE_PARTICIPANT; if (PARTICIPANT_HEARTBEAT_SUPPRESSION_DELAY /= 0) then -- Set Heartbeat Suppression Time deadline_next <= time + PARTICIPANT_HEARTBEAT_SUPPRESSION_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '1'; else -- Zero Heartbeat Response Time deadline_next <= (others => (others => '0')); end if; update_participant_flags_next <= (HEARTBEAT_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; -- Send ACKNACK -- Increment Heartbeat/Acknack Counter count_next <= count + 1; stage_next <= SEND_HEADER; return_stage_next <= SEND_ACKNACK; cnt_next <= 0; end if; -- Acknack Response else -- If Suppression Delay passed, zero the time if(mem_participant_data.acknack_res_time(1)(0) = '1') then -- Zero Acknack Response Time mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= (others => (others => '0')); update_participant_flags_next <= (ACKNACK_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; -- DONE stage_next <= IDLE; -- If Response Delay Passed else mem_opcode <= UPDATE_PARTICIPANT; if (PARTICIPANT_ACKNACK_SUPPRESSION_DELAY /= 0) then -- Set Acknack Suppression Time deadline_next <= time + PARTICIPANT_ACKNACK_SUPPRESSION_DELAY; -- NOTE: Last Bit denotes if this is Response or Suppression Delay deadline_next(1)(0) <= '1'; else -- Zero Acknack Response Time deadline_next <= (others => (others => '0')); end if; -- Zero Data Response Flags extra_flags_next <= mem_participant_data.extra_flags; extra_flags_next(PUB_DATA_FLAG) <= '0'; extra_flags_next(SUB_DATA_FLAG) <= '0'; extra_flags_next(MES_DATA_FLAG) <= '0'; update_participant_flags_next <= (EXTRA_FLAGS_FLAG => '1', ACKNACK_RES_TIME_FLAG => '1', others => '0'); mem_op_start <= '1'; -- Send Requested Data stage_next <= SEND_HEADER; return_stage_next <= SEND_PUB_DATA; cnt_next <= 0; end if; end if; end if; -- No Stale Entry Found else -- DONE stage_next <= IDLE; end if; end if; when LATCH_REMOVED_GUIDPREFIX => if (mem_op_done = '1') then -- Help Stage needed to latch the GUID Prefix of the removed staled participant guid_next(0) <= mem_guidprefix(0); guid_next(1) <= mem_guidprefix(1); guid_next(2) <= mem_guidprefix(2); stage_next <= INFORM_ENDPOINTS_PARTICIPANT_UNMATCH; end if; when PROCESS_PL => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Reset Word Counter reset_read_cnt <= '1'; -- Latch Parameter End (In order to skip parameters) parameter_end_next <= unsigned(endian_swap(endian_flag,parameter_length)); -- DEFAULT STAGE stage_next <= SKIP_PARAMETER; -- TODO: DDS-XTYPES: When reading data, implementations of this specification shall be robust to any setting of the FLAG_MUST_UNDERSTAND bit and accept the parameter nevertheless. -- NOTE: In-line QoS is completely ignored case (parameter_id) is when PID_PARTICIPANT_GUID => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= MATCH_GUID; cnt_next <= 0; end if; when PID_DOMAIN_ID => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= MATCH_DOMAIN_ID; end if; when PID_DOMAIN_TAG => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= LATCH_STRING_LENGTH; -- Mark String contents (Needed for string comparison) string_content_next <= DOMAIN_TAG_TYPE; -- Mark reception of DOMAIN_TAG rcvd_next(DOMAIN_TAG_RCVD) <= '1'; end if; when PID_PROTOCOL_VERSION => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= MATCH_PROTOCOL_VERSION; end if; when PID_DEFAULT_UNICAST_LOCATOR => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= LATCH_LOCATOR; cnt_next <= 0; is_meta_addr_next <= '0'; end if; when PID_DEFAULT_MULTICAST_LOCATOR => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= LATCH_LOCATOR; cnt_next <= 0; is_meta_addr_next <= '0'; end if; when PID_METATRAFFIC_UNICAST_LOCATOR => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= LATCH_LOCATOR; cnt_next <= 0; is_meta_addr_next <= '1'; end if; when PID_METATRAFFIC_MULTICAST_LOCATOR => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= LATCH_LOCATOR; cnt_next <= 0; is_meta_addr_next <= '1'; end if; when PID_PARTICIPANT_LEASE_DURATION => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= LATCH_LEASE_DURATION; cnt_next <= 0; end if; when PID_BUILTIN_ENDPOINT_SET => -- Ignore in-line QoS -- Only relevant for Participant Discovery Protocol if(qos_flag = '0' and message_type = PDP) then stage_next <= CHECK_REMOTE_BUILTIN_ENDPOINTS; end if; when PID_BUILTIN_ENDPOINT_QOS => -- Only relevant for Participant Discovery Protocol -- NOTE: As of DDSI-RTPS 2.3 the PID_BUILTIN_ENDPOINT_QOS only contains the BEST_EFFORT_PARTICIPANT_MESSAGE_DATA_READER bit -- Due to how the built-in Endpoint is behaving, this bit as no impact in our case and we can safely ignore it. -- Ignore null; when PID_TOPIC_NAME => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= LATCH_STRING_LENGTH; -- Mark String contents (Needed for string comparison) string_content_next <= TOPIC_NAME_TYPE; end if; when PID_TYPE_NAME => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= LATCH_STRING_LENGTH; -- Mark String contents (Needed for string comparison) string_content_next <= TYPE_NAME_TYPE; end if; when PID_DURABILITY => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_DURABILITY; rcvd_next(DURABILITY_QOS_RCVD_FLAG) <= '1'; end if; when PID_DEADLINE => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_DEADLINE; cnt_next <= 0; rcvd_next(DEADLINE_QOS_RCVD_FLAG) <= '1'; end if; when PID_LIVELINESS => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_LIVELINESS; rcvd_next(LIVELINESS_QOS_RCVD_FLAG) <= '1'; end if; when PID_RELIABILITY => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_RELIABILITY; cnt_next <= 0; rcvd_next(RELIABILITY_QOS_RCVD_FLAG) <= '1'; end if; when PID_DESTINATION_ORDER => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_DESTINATION_ORDER; rcvd_next(DESTINATION_ORDER_QOS_RCVD_FLAG) <= '1'; end if; when PID_OWNERSHIP => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_OWNERSHIP; rcvd_next(OWNERSHIP_QOS_RCVD_FLAG) <= '1'; end if; when PID_PRESENTATION => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_PRESENTATION; cnt_next <= 0; rcvd_next(PRESENTATION_QOS_RCVD_FLAG) <= '1'; end if; when PID_PARTITION => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_PARTITION; end if; when PID_LATENCY_BUDGET => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= RXO_LATENCY_BUDGET; cnt_next <= 0; rcvd_next(LATENCY_BUDGET_QOS_RCVD_FLAG) <= '1'; end if; when PID_UNICAST_LOCATOR => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= LATCH_LOCATOR; cnt_next <= 0; -- Mark Latch 1 for storing is_meta_addr_next <= '0'; end if; when PID_MULTICAST_LOCATOR => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= LATCH_LOCATOR; cnt_next <= 0; -- Mark Latch 1 for storing is_meta_addr_next <= '0'; end if; when PID_ENDPOINT_GUID => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= MATCH_GUID; cnt_next <= 0; end if; when PID_DATA_MAX_SIZE_SERIALIZED => -- Ignore in-line QoS -- Only relevant for Endpoint Discovery Protocol if(qos_flag = '0' and message_type = EDP) then stage_next <= CHECK_MAX_SIZE_SERIALIZED; end if; when PID_EXPECTS_INLINE_QOS => stage_next <= LATCH_EXPECTS_INLINE_QOS; when PID_PARTICIPANT_MANUAL_LIVELINESS_COUNT => -- Ignore null; when PID_CONTENT_FILTER_PROPERTY => -- Ignore null; when PID_GROUP_GUID => -- Ignore null; when PID_PROPERTY_LIST => -- Ignore null; when PID_ENTITY_NAME => -- Ignore null; when PID_TIME_BASED_FILTER => -- Ignore null; when PID_TRANSPORT_PRIORITY => -- Ignore null; when PID_VENDORID => -- Ignore null; when PID_OWNERSHIP_STRENGTH => -- Ignore null; when PID_HISTORY => -- Ignore null; when PID_RESOURCE_LIMITS => -- Ignore null; when PID_LIFESPAN => -- Ignore -- NOTE: Lifespan is requested via in-line QoS and handled directly by the endpoint null; when PID_DURABILITY_SERVICE => -- Ignore null; when PID_USER_DATA => -- Ignore null; when PID_GROUP_DATA => -- Ignore null; when PID_TOPIC_DATA => -- Ignore null; when PID_CONTENT_FILTER_INFO => -- Ignore null; when PID_COHERENT_SET => -- Ignore null; when PID_DIRECTED_WRITE => -- Ignore null; when PID_ORIGINAL_WRITER_INFO => -- Ignore null; when PID_GROUP_COHERENT_SET => -- Ignore null; when PID_GROUP_SEQ_NUM => -- Ignore null; when PID_WRITER_GROUP_INFO => -- Ignore null; when PID_SECURE_WRITER_GROUP_INFO => -- Ignore null; when PID_KEY_HASH => -- Ignore null; when PID_STATUS_INFO => -- Ignore null; when PID_PAD => -- Ignore null; when PID_EXTENDED => -- TODO null; when PID_IGNORE => -- Ignore null; when PID_SENTINEL => -- If Processing in-line QoS until now, start processing data if(qos_flag = '1') then -- Override QoS Flag qos_flag_next <= '0'; stage_next <= PROCESS_DATA; -- Else check Defaults else stage_next <= CHECK_DEFAULT; end if; when PID_LIST_END => -- TODO null; when others => -- If MUST_UNDERSTAND Flag is set, we have incompatible communication. Drop Packet if (must_understand = '1') then stage_next <= SKIP_PACKET; -- Else skip Uknown Parameter else stage_next <= SKIP_PARAMETER; end if; end case; end if; when CHECK_DEFAULT => -- DEFAULT stage_next <= PARTICIPANT_MATCH_STAGE; case (message_type) is when PDP => -- Check Domain Tag against Default if necessary if (rcvd(DOMAIN_TAG_RCVD) = '0' and DOMAIN_TAG /= DEFAULT_DOMAIN_TAG) then participant_match_next <= '0'; end if; when EDP => -- Defaults tmp_endpoint_mask := (others => '1'); if (is_subscriber = '1') then tmp_default_qos_match := READER_DEFAULT_QOS_MATCH; else tmp_default_qos_match := WRITER_DEFAULT_QOS_MATCH; end if; if (rcvd(DURABILITY_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.DURABILITY_QOS; end if; if (rcvd(PRESENTATION_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.PRESENTATION_QOS; end if; if (rcvd(DEADLINE_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.DEADLINE_QOS; end if; if (rcvd(LATENCY_BUDGET_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.LATENCY_BUDGET_QOS; end if; if (rcvd(OWNERSHIP_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.OWNERSHIP_QOS; end if; if (rcvd(LIVELINESS_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.LIVELINESS_QOS; end if; if (rcvd(RELIABILITY_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.RELIABILITY_QOS; end if; if (rcvd(DESTINATION_ORDER_QOS_RCVD_FLAG) = '0') then tmp_endpoint_mask := tmp_endpoint_mask and tmp_default_qos_match.DESTINATION_ORDER_QOS; end if; endpoint_mask_next <= endpoint_mask and tmp_endpoint_mask; when others => null; end case; when LATCH_STRING_LENGTH => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; string_length_next <= unsigned(data_in_swapped); stage_next <= COMPARE_STRING; compare_length_next <= to_unsigned(1,compare_length'length); cnt_next <= 0; end if; when COMPARE_STRING => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; compare_length_next <= compare_length + 1; cnt_next <= cnt + 1; -- NOTE: This assumes that the Parameter is padded with zeroes (Since we also compare the padding) -- XTypes 7.4.1.1 requires padding bytes for "PLAIN_CDR" to be zero, but does not specify the value for "PL_CDR" -- Unmark matches on string comparison missmatch case (string_content) is when TOPIC_NAME_TYPE => for i in 0 to NUM_ENDPOINTS-1 loop if (data_in /= ENDPOINT_TOPIC(i)(cnt)) then endpoint_mask_next(i) <= '0'; end if; end loop; when TYPE_NAME_TYPE => for i in 0 to NUM_ENDPOINTS-1 loop if (data_in /= ENDPOINT_TYPE(i)(cnt)) then endpoint_mask_next(i) <= '0'; end if; end loop; when DOMAIN_TAG_TYPE => if (data_in /= DOMAIN_TAG(cnt)) then participant_match_next <= '0'; end if; when others => null; end case; -- NOTE: "compare_length" counts the 4-Byte words, while "string_length" contains the total string octets/bytes -- End of String (Exit Condition) if ((compare_length & "00") >= string_length) then -- DONE stage_next <= SKIP_PARAMETER; end if; end if; when MATCH_GUID => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; -- Check if GUID Prefix valid (Should be the same as the GUID Prefix of the Packet) and update the Entity ID case (cnt) is when 0 => if (data_in /= guid(0)) then stage_next <= SKIP_PACKET; end if; when 1 => if (data_in /= guid(1)) then stage_next <= SKIP_PACKET; end if; when 2 => if (data_in /= guid(2)) then stage_next <= SKIP_PACKET; end if; when 3 => -- NOTE: Even though the mem_ctrl_prc is currently using the guid signal, it only uses the first -- 3 words (GUIDPrefix) for the SEARCH_PARTICIPANT guid_next(3) <= data_in; -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when MATCH_DOMAIN_ID => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Match Domain ID if (data_in_swapped /= DOMAIN_ID) then participant_match_next <= '0'; end if; -- DONE stage_next <= SKIP_PARAMETER; end if; when MATCH_PROTOCOL_VERSION => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Match major Protocol Version if(data_in(31 downto 24) /= PROTOCOLVERSION_2_4(15 downto 8)) then participant_match_next <= '0'; end if; -- DONE stage_next <= SKIP_PARAMETER; end if; when LATCH_LOCATOR => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is -- Locator Kind when 0 => -- Check if UDPv4 Locator if (data_in_swapped /= LOCATOR_KIND_UDPv4) then -- Skip stage_next <= SKIP_PARAMETER; end if; -- Locator Port when 1 => -- Latch Source Port -- SANITY CHECK: Check if UDP Port valid if (data_in_swapped(UDP_PORT_INVALID'range) /= UDP_PORT_INVALID) then -- NOTE: We have to make sure that the address is also valid -- Temporal Latch long_latch_next <= data_in_swapped; else -- Ignore stage_next <= SKIP_PARAMETER; end if; -- Locator Address 1/4 when 2 => null; -- Locator Address 2/4 when 3 => null; -- Locator Address 3/4 when 4 => null; -- Locator Address 4/4 (IPv4) when 5 => -- Latch Src Addr -- SANITY CHECK: Check if IPv4 Address valid if (data_in_swapped /= IPv4_ADDRESS_INVALID) then if (is_meta_addr = '0') then def_addr_next <= data_in; def_port_next <= long_latch(def_port'length-1 downto 0); else meta_addr_next <= data_in; meta_port_next <= long_latch(meta_port'length-1 downto 0); end if; end if; -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when LATCH_EXPECTS_INLINE_QOS => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Latch 'expectsInlineQoS' extra_flags_next(EXPECTS_INLINE_QOS_FLAG) <= data_in(24); expects_inline_qos_rcv_next <= '1'; -- DONE stage_next <= SKIP_PARAMETER; end if; when LATCH_LEASE_DURATION => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; -- Latch Lease Duration case (cnt) is when 0 => lease_duration_next(0) <= unsigned(data_in_swapped); when 1 => lease_duration_next(1) <= unsigned(data_in_swapped); -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when CHECK_REMOTE_BUILTIN_ENDPOINTS => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- SANITY CHECK (Builtin Participant and Participant Message Endpoints have to be always available) if ( data_in_swapped(DISC_BUILTIN_ENDPOINT_PARTICIPANT_ANNOUNCER) = '0' or data_in_swapped(DISC_BUILTIN_ENDPOINT_PARTICIPANT_DETECTOR) = '0' or data_in_swapped(BUILTIN_ENDPOINT_PARTICIPANT_MESSAGE_DATA_WRITER) = '0' or data_in_swapped(BUILTIN_ENDPOINT_PARTICIPANT_MESSAGE_DATA_READER) = '0') then participant_match_next <= '0'; end if; -- Check for necessary Builtin Endpoints for Readers and Writers if ( (NUM_READERS > 0 and (data_in_swapped(DISC_BUILTIN_ENDPOINT_PUBLICATIONS_ANNOUNCER) = '0' or data_in_swapped(DISC_BUILTIN_ENDPOINT_SUBSCRIPTIONS_DETECTOR) = '0')) and (NUM_WRITERS > 0 and (data_in_swapped(DISC_BUILTIN_ENDPOINT_SUBSCRIPTIONS_ANNOUNCER) = '0' or data_in_swapped(DISC_BUILTIN_ENDPOINT_PUBLICATIONS_DETECTOR) = '0')) ) then participant_match_next <= '0'; end if; -- DONE stage_next <= SKIP_PARAMETER; end if; when RXO_DURABILITY => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered >= requested, with VOLATILE < TRANSIENT_LOCAL < TRANSIENT < PERSISTENT for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '1', unsigned(data_in_swapped), unsigned(ENDPOINT_DURABILITY_QOS(i)))) then endpoint_mask_next(i) <= '0'; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; end if; when RXO_DEADLINE => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is when 0 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered <= requested for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '0', unsigned(data_in_swapped), ENDPOINT_DEADLINE_QOS(i)(0))) then endpoint_mask_next(i) <= '0'; end if; end loop; when 1 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered <= requested for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '0', unsigned(data_in_swapped), ENDPOINT_DEADLINE_QOS(i)(1))) then endpoint_mask_next(i) <= '0'; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when RXO_LIVELINESS => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered >= requested, with AUTOMATIC < MANUAL_BY_PARTICIPANT < MANUAL_BY_TOPIC for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '1', unsigned(data_in_swapped), unsigned(ENDPOINT_LIVELINESS_QOS(i)))) then endpoint_mask_next(i) <= '0'; end if; end loop; stage_next <= RXO_LEASE_DURATION; cnt_next <= 0; end if; when RXO_LEASE_DURATION => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is when 0 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered <= requested for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '0', unsigned(data_in_swapped), ENDPOINT_LEASE_DURATION(i)(0))) then endpoint_mask_next(i) <= '0'; end if; end loop; when 1 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered <= requested for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '0', unsigned(data_in_swapped), ENDPOINT_LEASE_DURATION(i)(1))) then endpoint_mask_next(i) <= '0'; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when RXO_RELIABILITY => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is when 0 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered >= requested, with BEST_EFFORT < RELIABLE for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '1', unsigned(data_in_swapped), unsigned(ENDPOINT_RELIABILITY_QOS(i)))) then endpoint_mask_next(i) <= '0'; end if; end loop; when 1 => -- NOTE: The max_blocking_time value is ignored null; when 2 => -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when RXO_DESTINATION_ORDER => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered >= requested, with BY_RECEPTION_TIMESTAMP < BY_SOURCE_TIMESTAMP for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '1', unsigned(data_in_swapped), unsigned(ENDPOINT_DESTINATION_ORDER_QOS(i)))) then endpoint_mask_next(i) <= '0'; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; end if; when RXO_OWNERSHIP => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered = requested for i in 0 to NUM_ENDPOINTS-1 loop if (data_in_swapped /= ENDPOINT_OWNERSHIP_QOS(i)) then endpoint_mask_next(i) <= '0'; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; end if; when RXO_PRESENTATION => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is when 0 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered >= requested, with INSTANCE < TOPIC < GROUP for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '1', unsigned(data_in_swapped), unsigned(ENDPOINT_PRESENTATION_QOS(i)))) then endpoint_mask_next(i) <= '0'; end if; end loop; when 1 => -- Check QoS Compatibility (Unmark match on incompatibility) for i in 0 to NUM_ENDPOINTS-1 loop -- data-in is Subscriber-Requested -- COMPATIBLE (DDS v1.4): requested=FALSE or requested=offered=TRUE if (is_subscriber = '1') then if (data_in(24) = '1' and not ENDPOINT_COHERENT_ACCESS(i)) then endpoint_mask_next(i) <= '0'; end if; if (data_in(16) = '1' and not ENDPOINT_ORDERED_ACCESS(i)) then endpoint_mask_next(i) <= '0'; end if; -- data-in is Publisher-Offered else if (data_in(24) = '0' and ENDPOINT_COHERENT_ACCESS(i)) then endpoint_mask_next(i) <= '0'; end if; if (data_in(16) = '0' and ENDPOINT_ORDERED_ACCESS(i)) then endpoint_mask_next(i) <= '0'; end if; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when RXO_PARTITION => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- NOTE: Endpoints are only matched against the default empty partition. -- Match Partition Names if (data_in_swapped /= (data_in_swapped'reverse_range => '0')) then endpoint_mask_next <= (others => '0'); end if; -- DONE stage_next <= SKIP_PARAMETER; end if; when RXO_LATENCY_BUDGET => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; cnt_next <= cnt + 1; case (cnt) is when 0 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered <= requested for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '0', unsigned(data_in_swapped), ENDPOINT_LATENCY_BUDGET_QOS(i)(0))) then endpoint_mask_next(i) <= '0'; end if; end loop; when 1 => -- Check QoS Compatibility (Unmark match on incompatibility) -- COMPATIBLE (DDS v1.4): offered <= requested for i in 0 to NUM_ENDPOINTS-1 loop if (not check_qos_compatibility(is_subscriber, '0', unsigned(data_in_swapped), ENDPOINT_LATENCY_BUDGET_QOS(i)(1))) then endpoint_mask_next(i) <= '0'; end if; end loop; -- DONE stage_next <= SKIP_PARAMETER; when others => null; end case; end if; when CHECK_MAX_SIZE_SERIALIZED => -- Input FIFO Guard if (empty = '0') then rd_guard := '1'; -- Ignore Publishers that may need Fragmentation if (is_subscriber = '0' and unsigned(data_in_swapped) > to_unsigned(UDP_MAX_SIZE_SERIALIZED, CDR_LONG_WIDTH)) then endpoint_mask_next <= (others => '0'); end if; -- DONE stage_next <= SKIP_PARAMETER; end if; when PARTICIPANT_MATCH_STAGE => -- Wait for Participant Search to finish and Next Sequence Number to be set if (mem_op_done = '1' and seq_prc_done = '1') then -- Participant not in Buffer if (addr_res = MAX_ADDRESS) then -- Participant Match if (message_type = PDP and participant_match = '1') then -- Add participant in buffer deadline_next <= time + lease_duration; mem_opcode <= INSERT_PARTICIPANT; mem_op_start <= '1'; -- DONE stage_next <= SKIP_PACKET; else -- Ignore all other messages, since there is no corresponding participant in the buffer. stage_next <= SKIP_PACKET; end if; -- Participant in Buffer else -- Participant Announcement if (message_type = PDP) then -- Newer Sequence Number if (mem_seq_nr < seq_nr) then -- Participant Unmatch if (participant_match = '0') then -- Remove participant from buffer mem_opcode <= REMOVE_PARTICIPANT; mem_op_start <= '1'; -- Inform ENDPOINTS stage_next <= INFORM_ENDPOINTS_PARTICIPANT_UNMATCH; cnt_next <= 0; -- Participant remains matched else -- Update Participant Data and Lease mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + lease_duration; update_participant_flags_next <= (PARTICIPANT_DATA_FLAG => '1', LEASE_DEADLINE_FLAG => '1', EXTRA_FLAGS_FLAG => '1', others => '0'); mem_op_start <= '1'; -- DONE stage_next <= SKIP_PACKET; end if; -- Old Sequence Number else -- Update Lease mem_opcode <= UPDATE_PARTICIPANT; deadline_next <= time + lease_duration; update_participant_flags_next <= (LEASE_DEADLINE_FLAG => '1', others => '0'); mem_op_start <= '1'; -- DONE stage_next <= SKIP_PACKET; end if; -- NOTE: We only process the Sequences in order. This may lead to more traffic being exchanged -- (since all Data messages with a higher sequence number than the next expected will be ignored), -- but keeps the logic simple. -- Endpoint (Next Expected Sequence Number) elsif (message_type = EDP and next_seq_nr = seq_nr) then -- Store new Sequence Number mem_opcode <= UPDATE_PARTICIPANT; update_participant_flags_next <= (EDP_SEQ_NR_FLAG => '1', others => '0'); mem_op_start <= '1'; -- At least one local Endpoint match if (endpoint_mask /= (endpoint_mask'range => '0')) then -- Propagate Matches to local Endpoints stage_next <= INFORM_ENDPOINTS_MATCH; cnt_next <= 0; -- No local Endpoint matches else -- Propagate Matches to local Endpoints stage_next <= INFORM_ENDPOINTS_UNMATCH; cnt_next <= 0; end if; else -- Ignore (Messages are handled in a dedicated stage) stage_next <= SKIP_PACKET; end if; end if; end if; when INFORM_ENDPOINTS_MATCH => -- Output FIFO Guard if ((endpoint_mask and endpoint_full) = (endpoint_full'range => '0')) then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- Match Opcode when 0 => data_out <= OPCODE_ENDPOINT_MATCH; -- GUID Prefix 1/3 when 1 => data_out <= guid(0); -- GUID Prefix 2/3 when 2 => data_out <= guid(1); -- GUID Prefix 3/3 when 3 => data_out <= guid(2); -- Entity ID when 4 => data_out <= guid(3); -- IPv4 Address when 5 => -- If Endpoint did not set Address, use Participant Default if (def_addr /= (def_addr'reverse_range => '0')) then data_out <= def_addr; else data_out <= mem_participant_data.def_addr; end if; -- UDPv4 Port and ExpectsInlineQoSFlag when 6 => -- Default data_out <= (others => '0'); last_word_out <= '1'; -- If Endpoint did not set Port, use Participant Default if (def_port /= (def_port'reverse_range => '0')) then data_out(31 downto 16) <= def_port; else data_out(31 downto 16) <= mem_participant_data.def_port; end if; -- If Endpoint did not set Flags, use Participant Default if (expects_inline_qos_rcv = '1') then data_out(0) <= extra_flags(EXPECTS_INLINE_QOS_FLAG); else -- TODO: Which one is it? --data_out(0) <= mem_participant_data.extra_flags(EXPECTS_INLINE_QOS_FLAG); data_out(0) <= DEFAULT_EXPECTS_INLINE_QOS; end if; -- DONE stage_next <= INFORM_ENDPOINTS_UNMATCH; cnt_next <= 0; when others => null; end case; end if; when INFORM_ENDPOINTS_UNMATCH => -- Output FIFO Guard if (((not endpoint_mask) and endpoint_full) = (endpoint_full'range => '0')) then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- Match Opcode when 0 => data_out <= OPCODE_ENDPOINT_UNMATCH; -- GUID Prefix 1/3 when 1 => data_out <= guid(0); -- GUID Prefix 2/3 when 2 => data_out <= guid(1); -- GUID Prefix 3/3 when 3 => data_out <= guid(2); -- Entity ID when 4 => data_out <= guid(3); last_word_out <= '1'; -- DONE stage_next <= SKIP_PACKET; when others => null; end case; end if; when INFORM_ENDPOINTS_PARTICIPANT_UNMATCH => -- Output FIFO Guard if (endpoint_full = (endpoint_full'range => '0')) then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- Match Opcode when 0 => data_out <= OPCODE_PARTICIPANT_UNMATCH; -- GUID Prefix 1/3 when 1 => data_out <= guid(0); -- GUID Prefix 2/3 when 2 => data_out <= guid(1); -- GUID Prefix 3/3 when 3 => data_out <= guid(2); last_word_out <= '1'; -- DONE stage_next <= SKIP_PACKET; when others => null; end case; end if; when SEND_HEADER => if (rtps_full = '0') then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- OUTPUT HEADER -- Src IPv4 Address when 0 => data_out <= DEFAULT_IPv4_META_ADDRESS; -- Dest IPv4 Address when 1 => -- Set Default Multicast Announce Address if Participant Announcement if (return_stage = SEND_PARTICIPANT_ANNOUNCEMENT) then data_out <= DEFAULT_IPv4_META_ADDRESS; else data_out <= mem_participant_data.meta_addr; end if; -- Src and Dest UDPv4 Ports when 2 => -- Set Default Multicast Announce Port if Participant Announcement if (return_stage = SEND_PARTICIPANT_ANNOUNCEMENT) then data_out <= META_IPv4_UNICAST_PORT & META_IPv4_MULTICAST_PORT; else data_out <= META_IPv4_UNICAST_PORT & mem_participant_data.meta_port; end if; -- RTPS MESSAGE HEADER when 3 => data_out <= PROTOCOL_RTPS; when 4 => data_out <= PROTOCOLVERSION_2_4 & VENDORID; when 5 => data_out <= GUIDPREFIX(0); when 6 => data_out <= GUIDPREFIX(1); when 7 => data_out <= GUIDPREFIX(2); -- Continue with respective RTPS Submessage stage_next <= return_stage; cnt_next <= 0; participant_data_cnt_next <= 0; publisher_data_cnt_next <= 0; subscriber_data_cnt_next <= 0; when others => null; end case; end if; when SEND_PARTICIPANT_ANNOUNCEMENT => if (rtps_full = '0') then wr_sig <= '1'; participant_data_cnt_next <= participant_data_cnt + 1; -- Send Participant Data data_out <= PARTICIPANT_DATA.data(participant_data_cnt); -- Exit Condition if (participant_data_cnt = (PARTICIPANT_DATA.length-1)) then last_word_out <= '1'; -- DONE stage_next <= IDLE; end if; end if; when SEND_ACKNACK => if (rtps_full = '0') then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- ACKNACK RTPS SUBMESSAGE (Publication) -- RTPS Submessage Header when 0 => data_out <= SID_ACKNACK & "00000010" & std_logic_vector(to_unsigned(24, 16)); -- Reader Entity ID when 1 => data_out <= ENTITYID_SEDP_BUILTIN_PUBLICATIONS_DETECTOR; -- Writer Entity ID when 2 => data_out <= ENTITYID_SEDP_BUILTIN_PUBLICATIONS_ANNOUNCER; -- Sequence Number Set (Bitmap Base 1/2) when 3 => data_out <= std_logic_vector(mem_participant_data.pub_seq_nr(0)); -- Sequence Number Set (Bitmap Base 2/2) when 4 => data_out <= std_logic_vector(mem_participant_data.pub_seq_nr(1)); -- Sequence Number Set (NumBits) when 5 => data_out <= (others => '0'); -- Count when 6 => data_out <= std_logic_vector(count); -- ACKNACK RTPS SUBMESSAGE (Subscription) -- RTPS Submessage Header when 7 => data_out <= SID_ACKNACK & "00000010" & std_logic_vector(to_unsigned(24, 16)); -- Reader Entity ID when 8 => data_out <= ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_DETECTOR; -- Writer Entity ID when 9 => data_out <= ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_ANNOUNCER; -- Sequence Number Set (Bitmap Base 1/2) when 10 => data_out <= std_logic_vector(mem_participant_data.sub_seq_nr(0)); -- Sequence Number Set (Bitmap Base 2/2) when 11 => data_out <= std_logic_vector(mem_participant_data.sub_seq_nr(1)); -- Sequence Number Set (NumBits) when 12 => data_out <= (others => '0'); -- Count when 13 => data_out <= std_logic_vector(count); -- ACKNACK RTPS SUBMESSAGE (Message) -- RTPS Submessage Header when 14 => data_out <= SID_ACKNACK & "00000010" & std_logic_vector(to_unsigned(24, 16)); -- Reader Entity ID when 15 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_READER; -- Writer Entity ID when 16 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_WRITER; -- Sequence Number Set (Bitmap Base 1/2) when 17 => data_out <= std_logic_vector(mem_participant_data.mes_seq_nr(0)); -- Sequence Number Set (Bitmap Base 2/2) when 18 => data_out <= std_logic_vector(mem_participant_data.mes_seq_nr(1)); -- Sequence Number Set (NumBits) when 19 => data_out <= (others => '0'); -- Count when 20 => data_out <= std_logic_vector(count); last_word_out <= '1'; -- DONE stage_next <= IDLE; when others => null; end case; end if; when SEND_HEARTBEAT => if (rtps_full = '0') then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- HEARTBEAT RTPS SUBMESSAGE (Publication) -- RTPS Submessage Header when 0 => data_out <= SID_HEARTBEAT & "00000010" & std_logic_vector(to_unsigned(28, 16)); -- Reader Entity ID when 1 => data_out <= ENTITYID_SEDP_BUILTIN_PUBLICATIONS_DETECTOR; -- Writer Entity ID when 2 => data_out <= ENTITYID_SEDP_BUILTIN_PUBLICATIONS_ANNOUNCER; -- Sequence Number 1/2 when 3 => data_out <= std_logic_vector(FIRST_SEQUENCENUMBER(0)); -- Sequence Number 2/2 when 4 => data_out <= std_logic_vector(FIRST_SEQUENCENUMBER(1)); -- Sequence Number 1/2 when 5 => data_out <= std_logic_vector(PUB_SEQUENCENUMBER(0)); -- Sequence Number 1/2 when 6 => data_out <= std_logic_vector(PUB_SEQUENCENUMBER(1)); -- Count when 7 => data_out <= std_logic_vector(count); -- HEARTBEAT RTPS SUBMESSAGE (Subscription) -- RTPS Submessage Header when 8 => data_out <= SID_HEARTBEAT & "00000010" & std_logic_vector(to_unsigned(28, 16)); -- Reader Entity ID when 9 => data_out <= ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_DETECTOR; -- Writer Entity ID when 10 => data_out <= ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_ANNOUNCER; -- Sequence Number 1/2 when 11 => data_out <= std_logic_vector(FIRST_SEQUENCENUMBER(0)); -- Sequence Number 2/2 when 12 => data_out <= std_logic_vector(FIRST_SEQUENCENUMBER(1)); -- Sequence Number 1/2 when 13 => data_out <= std_logic_vector(SUB_SEQUENCENUMBER(0)); -- Sequence Number 1/2 when 14 => data_out <= std_logic_vector(SUB_SEQUENCENUMBER(1)); -- Count when 15 => data_out <= std_logic_vector(count); -- HEARTBEAT RTPS SUBMESSAGE (Message) -- RTPS Submessage Header when 16 => data_out <= SID_HEARTBEAT & "00000010" & std_logic_vector(to_unsigned(28, 16)); -- Reader Entity ID when 17 => data_out <= ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_DETECTOR; -- Writer Entity ID when 18 => data_out <= ENTITYID_SEDP_BUILTIN_SUBSCRIPTIONS_ANNOUNCER; -- Sequence Number 1/2 when 19 => data_out <= std_logic_vector(man_live_seq_nr(0)); -- Sequence Number 2/2 when 20 => data_out <= std_logic_vector(man_live_seq_nr(1)); -- Sequence Number 1/2 when 21 => data_out <= std_logic_vector(auto_live_seq_nr(0)); -- Sequence Number 1/2 when 22 => data_out <= std_logic_vector(auto_live_seq_nr(1)); -- Count when 23 => data_out <= std_logic_vector(count); -- If manual and automatic sequence numbers are not consecutive, we have only asserted the automatic liveliness if (live_gap_start /= auto_live_seq_nr) then stage_next <= SEND_MES_AUTO_LIVE; cnt_next <= 0; -- Else we need to send both (manual and automatic) else stage_next <= SEND_MES_MAN_LIVE; cnt_next <= 0; end if; when others => null; end case; end if; when SEND_PUB_DATA => -- If Publisher Data not scheduled for response or no Writers available, skip if (mem_participant_data.extra_flags(PUB_DATA_FLAG) = '0' or NUM_WRITERS = 0) then stage_next <= SEND_SUB_DATA; -- Output FIFO Guard elsif (rtps_full = '0') then wr_sig <= '1'; publisher_data_cnt_next <= publisher_data_cnt + 1; -- Send Publisher Data data_out <= WRITER_ENDPOINT_DATA.data(publisher_data_cnt); -- Exit Condition if (publisher_data_cnt = (WRITER_ENDPOINT_DATA.length-1)) then last_word_out <= '1'; -- If we still have Data to sent, continue if (mem_participant_data.extra_flags(SUB_DATA_FLAG) = '1' or mem_participant_data.extra_flags(MES_DATA_FLAG) = '1') then stage_next <= SEND_HEADER; return_stage_next <= SEND_SUB_DATA; cnt_next <= 0; else -- DONE stage_next <= IDLE; end if; end if; end if; when SEND_SUB_DATA => -- If Subscriber Data not scheduled for response or no Readers available, skip if (mem_participant_data.extra_flags(PUB_DATA_FLAG) = '0' or NUM_READERS = 0) then stage_next <= SEND_MES_MAN_LIVE; -- Output FIFO Guard elsif (rtps_full = '0') then wr_sig <= '1'; subscriber_data_cnt_next <= subscriber_data_cnt + 1; -- Send Subscriber Data data_out <= READER_ENDPOINT_DATA.data(subscriber_data_cnt); -- Exit Condition if (subscriber_data_cnt = (READER_ENDPOINT_DATA.length-1)) then last_word_out <= '1'; -- If we still have Data to sent, continue if (mem_participant_data.extra_flags(MES_DATA_FLAG) = '1') then stage_next <= SEND_HEADER; return_stage_next <= SEND_MES_MAN_LIVE; cnt_next <= 0; else -- DONE stage_next <= IDLE; end if; end if; end if; when SEND_MES_MAN_LIVE => -- Output FIFO Guard if (rtps_full = '0') then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- DATA RTPS SUBMESSAGE (Participant Message) -- RTPS Submessage Header when 0 => data_out <= SID_DATA & "00000100" & std_logic_vector(to_unsigned(44, 16)); -- ExtraFlags, octetsToInlineQoS when 1 => data_out <= x"0000" & std_logic_vector(to_unsigned(16, 16)); -- Reader Entity ID when 2 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_READER; -- Writer Entity ID when 3 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_WRITER; -- Sequence Number 1/2 when 4 => data_out <= std_logic_vector(man_live_seq_nr(0)); -- Sequence Number 2/2 when 5 => data_out <= std_logic_vector(man_live_seq_nr(1)); -- Serialized Payload Header when 6 => data_out <= CDR_BE & x"0000"; -- Serialized Payload BEGIN -- GUID Prefix 1/3 when 7 => data_out <= GUIDPREFIX(0); -- GUID Prefix 2/3 when 8 => data_out <= GUIDPREFIX(1); -- GUID Prefix 3/3 when 9 => data_out <= GUIDPREFIX(2); -- Participant Message Kind when 10 => data_out <= PARTICIPANT_MESSAGE_DATA_KIND_MANUAL_LIVELINESS_UPDATE; -- Data Length when 11 => data_out <= (others => '0'); -- If manual and automatic sequence numbers are not consecutive, we need to send a GAP Message if (live_gap_start /= auto_live_seq_nr) then stage_next <= SEND_MES_GAP; cnt_next <= 0; else stage_next <= SEND_MES_AUTO_LIVE; cnt_next <= 0; end if; when others => null; end case; end if; when SEND_MES_GAP => -- Output FIFO Guard if (rtps_full = '0') then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- DATA RTPS SUBMESSAGE (Participant Message) -- RTPS Submessage Header when 0 => data_out <= SID_GAP & "00000000" & std_logic_vector(to_unsigned(28, 16)); -- Reader Entity ID when 1 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_READER; -- Writer Entity ID when 2 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_WRITER; -- GAP Start Sequence Number 1/2 when 3 => data_out <= std_logic_vector(live_gap_start(0)); -- GAP Start Sequence Number 2/2 when 4 => data_out <= std_logic_vector(live_gap_start(1)); -- GAP End Sequence Number Set (Bitmap Base 1/2) when 5 => data_out <= std_logic_vector(live_gap_end(0)); -- GAP End Sequence Number Set (Bitmap Base 2/2) when 6 => data_out <= std_logic_vector(live_gap_end(1)); -- GAP End Sequence Number Set (NumBits) when 7 => data_out <= (others => '0'); stage_next <= SEND_MES_AUTO_LIVE; cnt_next <= 0; when others => null; end case; end if; when SEND_MES_AUTO_LIVE => -- Output FIFO Guard if (rtps_full = '0') then wr_sig <= '1'; cnt_next <= cnt + 1; case (cnt) is -- DATA RTPS SUBMESSAGE (Participant Message) -- RTPS Submessage Header when 0 => data_out <= SID_DATA & "00000100" & std_logic_vector(to_unsigned(44, 16)); -- ExtraFlags, octetsToInlineQoS when 1 => data_out <= x"0000" & std_logic_vector(to_unsigned(16, 16)); -- Reader Entity ID when 2 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_READER; -- Writer Entity ID when 3 => data_out <= ENTITYID_P2P_BUILTIN_PARTICIPANT_MESSAGE_WRITER; -- Sequence Number 1/2 when 4 => data_out <= std_logic_vector(auto_live_seq_nr(0)); -- Sequence Number 2/2 when 5 => data_out <= std_logic_vector(auto_live_seq_nr(1)); -- Serialized Payload Header when 6 => data_out <= CDR_BE & x"0000"; -- Serialized Payload BEGIN -- GUID Prefix 1/3 when 7 => data_out <= GUIDPREFIX(0); -- GUID Prefix 2/3 when 8 => data_out <= GUIDPREFIX(1); -- GUID Prefix 3/3 when 9 => data_out <= GUIDPREFIX(2); -- Participant Message Kind when 10 => data_out <= PARTICIPANT_MESSAGE_DATA_KIND_AUTOMATIC_LIVELINESS_UPDATE; -- Data Length when 11 => data_out <= (others => '0'); last_word_out <= '1'; -- If we are in the middle of a liveliness assertion, find the next Participant destination if (is_live_assert = '1') then stage_next <= FIND_PARTICIPANT_DEST; mem_opcode <= FIND_NEXT_PARTICIPANT; mem_op_start <= '1'; else -- DONE stage_next <= IDLE; end if; when others => null; end case; end if; when SKIP_PARAMETER => if (last_word_in_latch = '1' and last_word_in = '0') then -- Reset Last Word In Latch last_word_in_latch_next <= '0'; -- Continue parsing next Packet stage_next <= IDLE; -- Reset Lengths parameter_end_next <= (others => '1'); -- End of Parameter elsif ((read_cnt & "00" ) >= parameter_end) then -- Parse Next Parameter -- NOTE: data_in is already showing the next parameter stage_next <= PROCESS_PL; -- Reset Parameter End parameter_end_next <= (others => '1'); -- Input FIFO Guard elsif (empty = '0') then -- Skip-Read rd_guard := '1'; end if; when SKIP_PACKET => -- NOTE: At the end of a Stale Entry Removal this stage is entered, without having started reading a Packet from input. -- Reset Parameter End parameter_end_next <= (others => '1'); -- Stale Check Exit if (stale_check = '1') then -- DONE stage_next <= IDLE; -- End of Packet elsif (last_word_in_latch = '1' and last_word_in = '0') then -- Reset Last Word In Latch last_word_in_latch_next <= '0'; -- DONE stage_next <= IDLE; -- Input FIFO Guard elsif (empty = '0') then -- Skip-Read rd_guard := '1'; end if; when others => null; end case; -- OVERREAD GUARD -- Read outside of packet Length -- NOTE: If the Packet Length is smaller than expected there will be a read from input FIFO while -- the Packet Length has been reached and will be caught by this clause. -- The SKIP_PACKET clause prevents a read signal from occuring in this situation, and thus prevents from entering this state. if ((last_word_in_latch = '1' and last_word_in = '0') and rd_guard = '1') then -- Force rd_sig low rd_sig <= '0'; -- Notify Endpoints of EOP last_word_out <= '1'; -- Continue parsing next Packet stage_next <= IDLE; -- Reset Last Word In Latch last_word_in_latch_next <= '0'; -- Reset Lengths parameter_end_next <= (others => '1'); -- Read outside of Parameter Length -- NOTE: If the Parameter Length is smaller than expected for a particular parameter, there will be a read from input FIFO while -- the Parameter Length has been reached and will be caught by this clause. -- The SKIP_PARAMETER clause prevents a read signal from occuring in this situation, and thus prevents from entering this state. elsif ((read_cnt & "00") >= parameter_end and rd_guard = '1') then -- Force rd_sig low rd_sig <= '0'; -- Notify Endpoints of EOP last_word_out <= '1'; -- Invalid Parameter Length, Skip Packet stage_next <= SKIP_PACKET; -- Reset Submessage End parameter_end_next <= (others => '1'); -- DEFAULT else rd_sig <= rd_guard; end if; end process; -- Main State Machine -- STATE DESCRIPTION -- IDLE Idle state. Done Signal is pulled high and Memory FSM accepts new memory operations -- SEARCH_PARTICIPANT See Memory OPCODE Description -- GET_PARTICIPANT_DATA Latch the contents of the Participant Entry for use in the main FSM -- INSERT_PARTICIPANT See Memory OPCODE Description -- UPDATE_PARTICIPANT See Memory OPCODE Description -- REMOVE_PARTICIPANT See Memory OPCODE Description -- FIND_PARTICIPANT_SLOT Find first empty Participant Slot in memory -- FIND_NEXT_PARTICIPANT See Memory OPCODE Description -- FIND_STALE_PARTICIPANT See Memory OPCODE Description mem_ctrl_prc : process(all) variable tmp : unsigned(mem_addr_base'range) := (others => '0'); variable tmp2 : unsigned(mem_addr_base'range) := (others => '0'); variable tmp3 : unsigned(mem_addr_base'range) := (others => '0'); begin -- DEFAULT Registered mem_stage_next <= mem_stage; mem_addr_base_next <= mem_addr_base; mem_addr_next <= mem_addr; addr_res_next <= addr_res; mem_cnt_next <= mem_cnt; mem_participant_data_next <= mem_participant_data; is_heartbeat_res_next <= is_heartbeat_res; mem_guidprefix_next <= mem_guidprefix; -- DEFAULT Unregistered mem_write_data <= (others => '0'); mem_op_done <= '0'; mem_rd <= '0'; mem_wr <= '0'; case (mem_stage) is when IDLE => mem_op_done <= '1'; if (mem_op_start = '1') then case(mem_opcode) is when SEARCH_PARTICIPANT => mem_addr_base_next <= FIRST_PARTICIPANT_ADDRESS; mem_addr_next <= FIRST_PARTICIPANT_ADDRESS; mem_stage_next <= SEARCH_PARTICIPANT; mem_cnt_next <= 0; when INSERT_PARTICIPANT => mem_addr_base_next <= FIRST_PARTICIPANT_ADDRESS; mem_addr_next <= FIRST_PARTICIPANT_ADDRESS; mem_stage_next <= FIND_PARTICIPANT_SLOT; mem_cnt_next <= 0; when UPDATE_PARTICIPANT => -- NOTE: We use the "_next" flag here, because it is not yet latched. if (update_participant_flags_next(PARTICIPANT_DATA_FLAG) = '1') then mem_stage_next <= UPDATE_PARTICIPANT; mem_addr_next <= addr_res + 3; mem_cnt_next <= 0; elsif (update_participant_flags_next(LEASE_DEADLINE_FLAG) = '1') then mem_stage_next <= UPDATE_PARTICIPANT; mem_addr_next <= addr_res + 10; mem_cnt_next <= 7; elsif (update_participant_flags_next(EXTRA_FLAGS_FLAG) = '1') then mem_stage_next <= UPDATE_PARTICIPANT; mem_addr_next <= addr_res + 12; mem_cnt_next <= 9; elsif (update_participant_flags_next(ACKNACK_RES_TIME_FLAG) = '1') then mem_stage_next <= UPDATE_PARTICIPANT; mem_addr_next <= addr_res + 13; mem_cnt_next <= 10; elsif (update_participant_flags_next(HEARTBEAT_RES_TIME_FLAG) = '1') then mem_stage_next <= UPDATE_PARTICIPANT; mem_addr_next <= addr_res + 15; mem_cnt_next <= 12; elsif (update_participant_flags_next(EDP_SEQ_NR_FLAG) = '1') then mem_stage_next <= UPDATE_PARTICIPANT; mem_addr_next <= addr_res + 17; mem_cnt_next <= 14; end if; when REMOVE_PARTICIPANT => mem_addr_next <= addr_res; mem_stage_next <= REMOVE_PARTICIPANT; mem_cnt_next <= 0; when FIND_STALE_PARTICIPANT => mem_addr_base_next <= FIRST_PARTICIPANT_ADDRESS; mem_addr_next <= FIRST_PARTICIPANT_ADDRESS; mem_stage_next <= FIND_STALE_PARTICIPANT; mem_cnt_next <= 0; when FIND_FIRST_PATICIPANT => mem_addr_base_next <= FIRST_PARTICIPANT_ADDRESS; mem_addr_next <= FIRST_PARTICIPANT_ADDRESS; mem_stage_next <= FIND_NEXT_PARTICIPANT; mem_cnt_next <= 0; when FIND_NEXT_PARTICIPANT => -- Next Participant Slot tmp := addr_res + PARTICIPANT_FRAME_SIZE; mem_addr_base_next <= tmp; mem_addr_next <= tmp; mem_stage_next <= FIND_NEXT_PARTICIPANT; mem_cnt_next <= 0; when others => null; end case; end if; when SEARCH_PARTICIPANT => mem_rd <= '1'; mem_cnt_next <= mem_cnt + 1; mem_addr_next <= mem_addr + 1; -- Next Participant Frame Address tmp := mem_addr_base + PARTICIPANT_FRAME_SIZE; case (mem_cnt) is -- Preload when 0 => null; -- GUID Prefix 1/3 when 1 => -- No Match if (mem_read_data /= guid(0)) then -- Reached End of Memory, No Match if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; -- GUID Prefix 2/3 when 2 => -- No Match if (mem_read_data /= guid(1)) then -- Reached End of Memory, No Match if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; -- GUID Prefix 3/3 when 3 => -- No Match if (mem_read_data /= guid(2)) then -- Reached End of Memory, No Match if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; -- Match else -- Fetch Participant Data addr_res_next <= mem_addr_base; mem_stage_next <= GET_PARTICIPANT_DATA; -- No preload needed mem_cnt_next <= 1; end if; when others => null; end case; when GET_PARTICIPANT_DATA => mem_rd <= '1'; mem_cnt_next <= mem_cnt + 1; mem_addr_next <= mem_addr + 1; case (mem_cnt) is -- Memory Preload when 0 => null; -- Metatraffic IPv4 Address when 1 => mem_participant_data_next.meta_addr <= mem_read_data; -- Default Endpoint IPv4 Address when 2 => mem_participant_data_next.def_addr <= mem_read_data; -- UDPv4 Ports when 3 => mem_participant_data_next.meta_port <= mem_read_data(31 downto 16); mem_participant_data_next.def_port <= mem_read_data(15 downto 0); -- SPDP Sequence Number 1/2 when 4 => mem_participant_data_next.spdp_seq_nr(0) <= unsigned(mem_read_data); -- SPDP Sequence Number 2/2 when 5 => mem_participant_data_next.spdp_seq_nr(1) <= unsigned(mem_read_data); -- Lease Duration 1/2 when 6 => mem_participant_data_next.lease_duration(0) <= unsigned(mem_read_data); -- Lease Duration 2/2 when 7 => mem_participant_data_next.lease_duration(1) <= unsigned(mem_read_data); -- Lease Deadline 1/2 when 8 => mem_participant_data_next.lease_deadline(0) <= unsigned(mem_read_data); -- Lease Deadline 2/2 when 9 => mem_participant_data_next.lease_deadline(1) <= unsigned(mem_read_data); -- Extra Flags when 10 => mem_participant_data_next.extra_flags <= mem_read_data(EXTRA_FLAGS_WIDTH-1 downto 0); -- ACKNACK Response/Suppression Time 1/2 when 11 => mem_participant_data_next.acknack_res_time(0) <= unsigned(mem_read_data); -- ACKNACK Response/Suppression Time 2/2 when 12 => mem_participant_data_next.acknack_res_time(1) <= unsigned(mem_read_data); -- HEARTBEAT Response/Suppression Time 1/2 when 13 => mem_participant_data_next.heartbeat_res_time(0) <= unsigned(mem_read_data); -- HEARTBEAT Response/Suppression Time 2/2 when 14 => mem_participant_data_next.heartbeat_res_time(1) <= unsigned(mem_read_data); -- Publication Sequence Number 1/2 when 15 => mem_participant_data_next.pub_seq_nr(0) <= unsigned(mem_read_data); -- Publication Sequence Number 2/2 when 16 => mem_participant_data_next.pub_seq_nr(1) <= unsigned(mem_read_data); -- Subscription Sequence Number 1/2 when 17 => mem_participant_data_next.sub_seq_nr(0) <= unsigned(mem_read_data); -- Subscription Sequence Number 2/2 when 18 => mem_participant_data_next.sub_seq_nr(1) <= unsigned(mem_read_data); -- Participant Message Sequence Number 1/2 when 19 => mem_participant_data_next.mes_seq_nr(0) <= unsigned(mem_read_data); -- Participant Message Sequence Number 2/2 when 20 => mem_participant_data_next.mes_seq_nr(1) <= unsigned(mem_read_data); -- DONE mem_stage_next <= IDLE; when others => null; end case; when INSERT_PARTICIPANT => mem_wr <= '1'; mem_addr_next <= mem_addr + 1; mem_cnt_next <= mem_cnt + 1; case (mem_cnt) is -- GUIDPrefix 1/3 when 0 => mem_write_data <= guid(0); -- GUIDPrefix 2/3 when 1 => mem_write_data <= guid(1); -- GUIDPrefix 3/3 when 2 => mem_write_data <= guid(2); -- Metatraffic IPv4 Address when 3 => mem_write_data <= meta_addr; -- Default Endpoint IPv4 Address when 4 => mem_write_data <= def_addr; -- UDPv4 Ports when 5 => mem_write_data <= meta_port & def_port; -- SPDP Sequence Number 1/2 when 6 => mem_write_data <= std_logic_vector(seq_nr(0)); -- SPDP Sequence Number 2/2 when 7 => mem_write_data <= std_logic_vector(seq_nr(1)); -- Lease Duration 1/2 when 8 => mem_write_data <= std_logic_vector(lease_duration(0)); -- Lease Duration 2/2 when 9 => mem_write_data <= std_logic_vector(lease_duration(1)); -- Lease Deadline 1/2 when 10 => mem_write_data <= std_logic_vector(deadline(0)); -- Lease Deadline 2/2 when 11 => mem_write_data <= std_logic_vector(deadline(1)); -- Extra Flags when 12 => mem_write_data <= (others => '0'); mem_write_data(EXTRA_FLAGS_WIDTH-1 downto 0) <= extra_flags; -- ACKNACK Response/Suppression Time 1/2 when 13 => mem_write_data <= (others => '0'); -- ACKNACK Response/Suppression Time 2/2 when 14 => mem_write_data <= (others => '0'); -- HEARTBEAT Response/Suppression Time 1/2 when 15 => mem_write_data <= (others => '0'); -- HEARTBEAT Response/Suppression Time 2/2 when 16 => mem_write_data <= (others => '0'); -- Publication Sequence Number 1/2 when 17 => mem_write_data <= (others => '0'); -- Publication Sequence Number 2/2 when 18 => mem_write_data <= (others => '0'); -- Subscription Sequence Number 1/2 when 19 => mem_write_data <= (others => '0'); -- Subscription Sequence Number 2/2 when 20 => mem_write_data <= (others => '0'); -- Participant Message Sequence Number 1/2 when 21 => mem_write_data <= (others => '0'); -- Participant Message Sequence Number 2/2 when 22 => mem_write_data <= (others => '0'); -- DONE mem_stage_next <= IDLE; when others => null; end case; when UPDATE_PARTICIPANT => mem_cnt_next <= mem_cnt + 1; mem_addr_next <= mem_addr + 1; case (mem_cnt) is -- Metatraffic IPv4 Address when 0 => mem_write_data <= meta_addr; if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- Default Endpoint IPv4 Address when 1 => mem_write_data <= def_addr; if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- UDPv4 Ports when 2 => mem_write_data <= meta_port & def_port; if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- SPDP Sequence Number 1/2 when 3 => mem_write_data <= std_logic_vector(seq_nr(0)); if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- SPDP Sequence Number 2/2 when 4 => mem_write_data <= std_logic_vector(seq_nr(1)); if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- Lease Duration 1/2 when 5 => mem_write_data <= std_logic_vector(lease_duration(0)); if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- Lease Duration 2/2 when 6 => mem_write_data <= std_logic_vector(lease_duration(1)); if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- If nothing else to update if (update_participant_flags(5 downto 1) = (5 downto 1 => '0')) then -- DONE mem_stage_next <= IDLE; end if; -- Lease Deadline 1/2 when 7 => mem_write_data <= std_logic_vector(deadline(0)); if (update_participant_flags(LEASE_DEADLINE_FLAG) = '1') then mem_wr <= '1'; end if; -- Lease Deadline 2/2 when 8 => mem_write_data <= std_logic_vector(deadline(1)); if (update_participant_flags(LEASE_DEADLINE_FLAG) = '1') then mem_wr <= '1'; end if; -- If nothing else to update if (update_participant_flags(5 downto 2) = (5 downto 2 => '0')) then -- DONE mem_stage_next <= IDLE; end if; -- Extra Flags when 9 => mem_write_data <= (others => '0'); mem_write_data(EXTRA_FLAGS_WIDTH-1 downto 0) <= extra_flags; if (update_participant_flags(PARTICIPANT_DATA_FLAG) = '1') then mem_wr <= '1'; end if; -- If nothing else to update if (update_participant_flags(5 downto 3) = (5 downto 3 => '0')) then -- DONE mem_stage_next <= IDLE; end if; -- ACKNACK DEADLINE 1/2 when 10 => mem_write_data <= std_logic_vector(deadline(0)); if (update_participant_flags(ACKNACK_RES_TIME_FLAG) = '1') then mem_wr <= '1'; end if; -- ACKNACK DEADLINE 2/2 when 11 => mem_write_data <= std_logic_vector(deadline(1)); if (update_participant_flags(ACKNACK_RES_TIME_FLAG) = '1') then mem_wr <= '1'; end if; -- If nothing else to update if (update_participant_flags(5 downto 4) = (5 downto 4 => '0')) then -- DONE mem_stage_next <= IDLE; end if; -- HEARTBEAT DEADLINE 1/2 when 12 => mem_write_data <= std_logic_vector(deadline(0)); if (update_participant_flags(HEARTBEAT_RES_TIME_FLAG) = '1') then mem_wr <= '1'; end if; -- HEARTBEAT DEADLINE 2/2 when 13 => mem_write_data <= std_logic_vector(deadline(1)); if (update_participant_flags(HEARTBEAT_RES_TIME_FLAG) = '1') then mem_wr <= '1'; end if; -- If nothing else to update if (update_participant_flags(5 downto 5) = (5 downto 5 => '0')) then -- DONE mem_stage_next <= IDLE; end if; -- Publication Sequence Number 1/2 when 14 => mem_write_data <= std_logic_vector(seq_nr(0)); if (update_participant_flags(EDP_SEQ_NR_FLAG) = '1' and message_type = EDP and is_subscriber = '0') then mem_wr <= '1'; end if; -- Publication Sequence Number 2/2 when 15 => mem_write_data <= std_logic_vector(seq_nr(1)); if (update_participant_flags(EDP_SEQ_NR_FLAG) = '1' and message_type = EDP and is_subscriber = '0') then mem_wr <= '1'; end if; -- Subscription Sequence Number 1/2 when 16 => mem_write_data <= std_logic_vector(seq_nr(0)); if (update_participant_flags(EDP_SEQ_NR_FLAG) = '1' and message_type = EDP and is_subscriber = '1') then mem_wr <= '1'; end if; -- Subscription Sequence Number 2/2 when 17 => mem_write_data <= std_logic_vector(seq_nr(1)); if (update_participant_flags(EDP_SEQ_NR_FLAG) = '1' and message_type = EDP and is_subscriber = '1') then mem_wr <= '1'; end if; -- Participant Message Sequence Number 1/2 when 18 => mem_write_data <= std_logic_vector(seq_nr(0)); if (update_participant_flags(EDP_SEQ_NR_FLAG) = '1' and message_type = MESSAGE) then mem_wr <= '1'; end if; -- Participant Message Sequence Number 2/2 when 19 => mem_write_data <= std_logic_vector(seq_nr(1)); if (update_participant_flags(EDP_SEQ_NR_FLAG) = '1' and message_type = MESSAGE) then mem_wr <= '1'; end if; -- DONE mem_stage_next <= IDLE; when others => null; end case; when REMOVE_PARTICIPANT => mem_addr_next <= mem_addr + 1; mem_cnt_next <= mem_cnt + 1; -- Latch Participant GUID Prefix, and then overwrite with GUIDPREFIX_UNKNOWN to mark slot empty case (mem_cnt) is -- Preload when 0 => mem_rd <= '1'; -- GUID Prefix 1/3 when 1 => mem_rd <= '1'; mem_guidprefix_next(0) <= mem_read_data; -- GUID Prefix 2/3 when 2 => mem_rd <= '1'; mem_guidprefix_next(1) <= mem_read_data; -- GUID Prefix 3/3 when 3 => mem_rd <= '1'; mem_guidprefix_next(2) <= mem_read_data; mem_addr_next <= addr_res; -- GUID Prefix 1/3 when 4 => mem_wr <= '1'; mem_write_data <= GUIDPREFIX_UNKNOWN(0); -- GUID Prefix 2/3 when 5 => mem_wr <= '1'; mem_write_data <= GUIDPREFIX_UNKNOWN(1); -- GUID Prefix 3/3 when 6 => mem_wr <= '1'; mem_write_data <= GUIDPREFIX_UNKNOWN(2); -- DONE mem_stage_next <= IDLE; when others => null; end case; when FIND_PARTICIPANT_SLOT => mem_rd <= '1'; mem_addr_next <= mem_addr + 1; mem_cnt_next <= mem_cnt + 1; -- Next Participant Frame Address tmp := mem_addr_base + PARTICIPANT_FRAME_SIZE; case (mem_cnt) is -- Preload when 0 => null; -- GUID Prefix 1/3 when 1 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(0)) then if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then report "Memory Full, ignoring Participant Data" severity WARNING; addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; -- GUID Prefix 2/3 when 2 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(1)) then if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then report "Memory Full, ignoring Participant Data" severity WARNING; addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; -- GUID Prefix 3/3 when 3 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(2)) then if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then report "Memory Full, ignoring Participant Data" severity WARNING; addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; -- Slot Empty else -- Populate Participant Slot mem_stage_next <= INSERT_PARTICIPANT; mem_addr_next <= mem_addr_base; mem_cnt_next <= 0; end if; when others => null; end case; when FIND_NEXT_PARTICIPANT => mem_rd <= '1'; mem_cnt_next <= mem_cnt + 1; mem_addr_next <= mem_addr + 1; -- Next Participant Frame Address tmp := mem_addr_base + PARTICIPANT_FRAME_SIZE; -- Beginning of Participant Data tmp2 := mem_addr_base + 3; case (mem_cnt) is -- Preload when 0 => null; -- GUID Prefix 1/3 when 1 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(0)) then -- Get Participant Data mem_addr_next <= tmp2; addr_res_next <= mem_addr_base; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; end if; when 2 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(1)) then -- Get Participant Data mem_addr_next <= tmp2; addr_res_next <= mem_addr_base; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; end if; when 3 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(2)) then -- Get Participant Data mem_addr_next <= tmp2; addr_res_next <= mem_addr_base; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; -- Slot Empty else -- Reached End of Memory, No Match if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; when others => null; end case; when FIND_STALE_PARTICIPANT => mem_rd <= '1'; mem_cnt_next <= mem_cnt + 1; mem_addr_next <= mem_addr + 1; -- Next Participant Frame Address tmp := mem_addr_base + PARTICIPANT_FRAME_SIZE; -- Beginning of Lease Deadline tmp2 := mem_addr_base + 10; -- Beginning of Participant Data tmp3 := mem_addr_base + 3; case (mem_cnt) is -- Preload when 0 => null; -- GUID Prefix 1/3 when 1 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(0)) then -- Jump to Stale Check mem_addr_next <= tmp2; mem_cnt_next <= 4; end if; -- GUID Prefix 2/3 when 2 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(1)) then -- Jump to Stale Check mem_addr_next <= tmp2; mem_cnt_next <= 4; end if; -- GUID Prefix 3/3 when 3 => -- Slot Occupied if (mem_read_data /= GUIDPREFIX_UNKNOWN(2)) then -- Jump to Stale Check mem_addr_next <= tmp2; mem_cnt_next <= 4; -- Slot Empty else -- Reached End of Memory, No Match if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; -- Preload when 4 => null; -- Lease Deadline 1/2 when 5 => -- Lease Deadline passed if (unsigned(mem_read_data) < time(0)) then -- Mark Participant as stale addr_res_next <= mem_addr_base; mem_participant_data_next <= ZERO_PARTICIPANT_DATA; -- DONE mem_stage_next <= IDLE; end if; -- Lease Deadline 2/2 when 6 => -- Lease Deadline passed if (unsigned(mem_read_data) < time(1)) then -- Mark Participant as stale addr_res_next <= mem_addr_base; mem_participant_data_next <= ZERO_PARTICIPANT_DATA; -- DONE mem_stage_next <= IDLE; end if; -- Extra Flags when 7 => null; -- ACKNACK Response/Suppression Time 1/2 when 8 => -- Acknack Response/Suppression Time passed if (mem_read_data /= (mem_read_data'reverse_range => '0') and unsigned(mem_read_data) < time(0)) then -- Mark Participant and get Participant Data addr_res_next <= mem_addr_base; mem_addr_next <= tmp3; -- Mark as ACKNACK Trigger is_heartbeat_res_next <= '0'; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; end if; -- ACKNACK Response/Suppression Time 2/2 when 9 => -- Acknack Response/Suppression Time passed if (mem_read_data /= (mem_read_data'reverse_range => '0') and unsigned(mem_read_data) < time(1)) then -- Mark Participant and get Participant Data addr_res_next <= mem_addr_base; mem_addr_next <= tmp3; -- Mark as ACKNACK Trigger is_heartbeat_res_next <= '0'; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; end if; -- HEARTBEAT Response/Suppression Time 1/2 when 10 => -- Heartbeat Response/Suppression Time passed if (mem_read_data /= (mem_read_data'reverse_range => '0') and unsigned(mem_read_data) < time(0)) then -- Mark Participant and get Participant Data addr_res_next <= mem_addr_base; mem_addr_next <= tmp3; -- Mark as HEARTBEAT Trigger is_heartbeat_res_next <= '1'; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; end if; -- HEARTBEAT Response/Suppression Time 2/2 when 11 => -- Heartbeat Response/Suppression Time passed if (mem_read_data /= (mem_read_data'reverse_range => '0') and unsigned(mem_read_data) < time(1)) then -- Mark Participant and get Participant Data addr_res_next <= mem_addr_base; mem_addr_next <= tmp3; -- Mark as HEARTBEAT Trigger is_heartbeat_res_next <= '1'; mem_stage_next <= GET_PARTICIPANT_DATA; mem_cnt_next <= 0; -- Participant not Stale else -- Reached End of Memory, No Match if (mem_addr_base = MAX_PARTICIPANT_ADDRESS) then addr_res_next <= MAX_ADDRESS; --No match -- DONE mem_stage_next <= IDLE; else -- Continue Search mem_addr_next <= tmp; mem_addr_base_next <= tmp; mem_cnt_next <= 0; end if; end if; when others => null; end case; when others => null; end case; end process; -- Process responsible for counting read words -- This process uses the actual FIFO read signals to determine reads word_counter_prc : process(clk, reset) begin if rising_edge(clk) then -- Reset Read counter if (reset = '1' or reset_read_cnt = '1') then read_cnt <= (others => '0'); -- Increment read counter each time rd is high elsif (rd_sig = '1') then read_cnt <= read_cnt + 1; end if; end if; end process; sync: process(clk) begin if rising_edge(clk) then if (reset = '1') then stage <= IDLE; return_stage <= IDLE; message_type <= NONE; string_content <= DOMAIN_TAG_TYPE; mem_stage <= IDLE; parameter_end <= (others => '1'); opcode <= (others => '0'); flags <= (others => '0'); src_port <= (others => '0'); src_addr <= (others => '0'); src_entityid <= (others => '0'); dest_entityid <= (others => '0'); string_length <= (others => '0'); compare_length <= (others => '0'); endpoint_mask <= (others => '0'); def_addr <= (others => '0'); meta_addr <= (others => '0'); def_port <= (others => '0'); meta_port <= (others => '0'); extra_flags <= (others => '0'); update_participant_flags <= (others => '0'); count <= (others => '0'); mem_addr_base <= (others => '0'); mem_addr <= (others => '0'); addr_res <= (others => '0'); long_latch <= (others => '0'); rcvd <= (others => '0'); guid <= (others => (others => '0')); mem_guidprefix <= (others => (others => '0')); lease_duration <= (others => (others => '0')); deadline <= (others => (others => '0')); announcement_time <= (others => (others => '0')); heartbeat_time <= (others => (others => '0')); seq_nr <= (others => (others => '0')); mem_seq_nr <= (others => (others => '0')); next_seq_nr <= (others => (others => '0')); first_seq_nr <= (others => (others => '0')); last_seq_nr <= (others => (others => '0')); auto_live_seq_nr <= convert_to_double_word(to_unsigned(2, 64)); man_live_seq_nr <= convert_to_double_word(to_unsigned(1, 64)); live_gap_start <= convert_to_double_word(to_unsigned(2, 64)); live_gap_end <= convert_to_double_word(to_unsigned(1, 64)); mem_participant_data <= ZERO_PARTICIPANT_DATA; cnt <= 0; participant_data_cnt <= 0; publisher_data_cnt <= 0; subscriber_data_cnt <= 0; mem_cnt <= 0; seq_prc_done <= '0'; participant_match <= '0'; is_subscriber <= '0'; is_meta_addr <= '0'; expects_inline_qos_rcv <= '0'; stale_check <= '0'; is_live_assert <= '0'; is_heartbeat_res <= '0'; last_word_in_latch <= '0'; else stage <= stage_next; return_stage <= return_stage_next; message_type <= message_type_next; string_content <= string_content_next; mem_stage <= mem_stage_next; opcode <= opcode_next; flags <= flags_next; src_port <= src_port_next; src_addr <= src_addr_next; src_entityid <= src_entityid_next; dest_entityid <= dest_entityid_next; parameter_end <= parameter_end_next; string_length <= string_length_next; compare_length <= compare_length_next; endpoint_mask <= endpoint_mask_next; def_addr <= def_addr_next; meta_addr <= meta_addr_next; def_port <= def_port_next; meta_port <= meta_port_next; extra_flags <= extra_flags_next; update_participant_flags <= update_participant_flags_next; count <= count_next; mem_addr_base <= mem_addr_base_next; mem_addr <= mem_addr_next; addr_res <= addr_res_next; long_latch <= long_latch_next; rcvd <= rcvd_next; guid <= guid_next; mem_guidprefix <= mem_guidprefix_next; lease_duration <= lease_duration_next; deadline <= deadline_next; announcement_time <= announcement_time_next; heartbeat_time <= heartbeat_time_next; seq_nr <= seq_nr_next; mem_seq_nr <= mem_seq_nr_next; next_seq_nr <= next_seq_nr_next; first_seq_nr <= first_seq_nr_next; last_seq_nr <= last_seq_nr_next; auto_live_seq_nr <= auto_live_seq_nr_next; man_live_seq_nr <= man_live_seq_nr_next; live_gap_start <= live_gap_start_next; live_gap_end <= live_gap_end_next; mem_participant_data <= mem_participant_data_next; cnt <= cnt_next; participant_data_cnt <= participant_data_cnt_next; publisher_data_cnt <= publisher_data_cnt_next; subscriber_data_cnt <= subscriber_data_cnt_next; mem_cnt <= mem_cnt_next; seq_prc_done <= seq_prc_done_next; participant_match <= participant_match_next; is_subscriber <= is_subscriber_next; is_meta_addr <= is_meta_addr_next; expects_inline_qos_rcv <= expects_inline_qos_rcv_next; stale_check <= stale_check_next; is_live_assert <= is_live_assert_next; is_heartbeat_res <= is_heartbeat_res_next; last_word_in_latch <= last_word_in_latch_next; end if; end if; end process; end architecture;