Subversion Repositories gigabit_udp_mac

--****************************************************************************************

library IEEE;

use IEEE.STD_LOGIC_1164.all;

use IEEE.NUMERIC_STD.all;

use IEEE.std_logic_unsigned.all;

library work;

use work.signal_Package.all;

entity IPv4_RX is

  port (

        -- system signals

   i_rx_clk                     : in  std_logic;

   i_reset                      : in  std_logic;

   i_our_ip_address             : in  std_logic_vector (31 downto 0);

        -- MAC layer RX inputs

   i_mac_data_in                : in  std_logic_vector (7 downto 0);

   i_mac_data_in_valid          : in  std_logic;

   i_mac_data_in_last           : in  std_logic;

        -- Outputs to ip layer

        o_ip_dout               : buffer std_logic_vector(7 downto 0);

        o_ip_dout_rdy           : buffer std_logic;

        o_ip_data_last          : buffer std_logic;

        --Status Outputs

        o_src_ip                : out std_logic_vector(31 downto 0);

   o_dst_ip                     : out std_logic_vector(31 downto 0);

   o_data_len                   : out std_logic_vector(15 downto 0); --data len is ip_data_length that is udp data (ip_data-20)

   o_ip_rx_fragmantation   : out std_logic_vector(15 downto 0);

        o_protocol              : out std_logic_vector(7 downto 0);  --udp protocol

        o_broadcast             : out std_logic;

        --Error Status

   o_no_ping_packet             : out std_logic;

        o_ip_rx_err_out         : buffer std_logic_vector(3 downto 0)

   );

end IPv4_RX;

architecture Behavioral of ipv4_rx is

  --================================= Constant ===========================================================

--Generate Block Conditional Constants

constant c_GENERATE_PING_MODULE             : boolean  := true;                                  --if Ping Block is not Used,Value is False

constant c_GENERATE_ARP_MODULE              : boolean  := true;                                  --if ARP  Block is not Used,Value is False

constant c_DEFAULT_DST_MAC_ADDR             : std_logic_vector (47 downto 0) := x"F46D04962225"; --if ARP Block is not Used,Copy PC MAC Address to This Value    

--Application Layer Data Length

constant c_PACKET_LENGTH                    : std_logic_vector (15 downto 0):= x"05c0";          --1472 (Maximum Application Layer Packet Length)

constant c_udp_tx_src_ip                    : std_logic_vector (31 downto 0):= x"C0A86403";      --192.168.100.3(FPGA IP Adress)

constant c_udp_tx_dst_ip                    : std_logic_vector (31 downto 0):= x"C0A86402";      --192.168.100.2(PC IP Address)

constant c_udp_tx_protocol                  : std_logic_vector (7 downto 0) := x"11";            --UDP Protocol

constant c_udp_tx_src_mac                   : std_logic_vector (47 downto 0):= x"112233445566";  --FPGA MAC Address

constant c_udp_tx_checksum                  : std_logic_vector (15 downto 0):= x"0000";          --UDP Checksum(Value For This Constant is not Importanat)

constant c_udp_tx_src_port                  : std_logic_vector (15 downto 0):= x"0401";          --UDP Src Port(Value For This Constant is not Importanat)

constant c_udp_tx_dst_port                  : std_logic_vector (15 downto 0):= x"0FF5";          --UDP Dst Port(Value For This Constant is not Importanat)

--ARP Constants

constant c_TIME_OUT_LOOKUP_TABLE_ARP        : std_logic_vector (31 downto 0) := x"9502F900";     --20S(Value/125MHz = 20 )       

constant c_TIME_OUT_WAIT_FOR_ARP_REPLY      : std_logic_vector (31 downto 0) := x"07735940";     --1S    (Value/125MHz = 1 )     

constant c_RE_SEND_ARP_REQUEST              : std_logic_vector (3 downto 0)  := x"A";            --10    

--IP Constants

constant c_IP_TTL                           : std_logic_vector (7 downto 0)  := x"80";           -- IP Packet Time to live

constant c_IP_BC_ADDR                       : std_logic_vector (31 downto 0) := x"ffffffff";     -- Broadcast IP  Address

constant c_MAC_BC_ADDR                      : std_logic_vector (47 downto 0) := x"ffffffffffff"; -- Broadcast MAC Address

--======================================================================================================

--===================== Reset_gen Signals ==============================================================

signal   s_cnt_rst     : std_logic_vector(15 downto 0):=(others=>'0');

--======================================================================================================

--================================ Ethernet 1g Signals =================================================

signal   s_gtx_clk                :  std_logic;

signal   s_tx_clk                 :  std_logic;

signal   s_rx_clk                 :  std_logic;

signal   s_rstn                   :  std_logic;

signal   s_rx_reset             :  std_logic;

signal   s_tx_reset             :  std_logic;

--mac to gmii_if signals

signal   s_mac_gmii_rxd           :  std_logic_vector(7 downto 0);

signal   s_mac_gmii_rx_dv         :  std_logic;

signal   s_mac_gmii_rx_er         :  std_logic;

signal   s_mac_gmii_txd           :  std_logic_vector(7 downto 0);

signal   s_mac_gmii_tx_en         :  std_logic;

signal   s_mac_gmii_tx_er         :  std_logic;

--ip to mac signals

signal   s_mac_tx_tready        :  std_logic;

signal  s_mac_tx_tdata         :  std_logic_vector(7 downto 0);

signal   s_mac_tx_tvalid        :  std_logic;

signal   s_mac_tx_tlast         :  std_logic;

signal   s_mac_rx_tdata         :  std_logic_vector(7 downto 0);

signal   s_mac_rx_tvalid        :  std_logic;

signal   s_mac_rx_tlast         :  std_logic;

--======================================================================================================

--================================ UDP Signals =========================================================

    -------- for transfer Rx data from IP to UDP layer----------------

        signal s_ip_rx_dout           :  std_logic_vector(7 downto 0);

        signal s_ip_rx_dout_rdy       :  std_logic;

        signal s_ip_rx_dout_last      :  std_logic;

        -------- for transfer Rx status data from IP to UDP layer---------

        signal s_ip_rx_src_ip         :  std_logic_vector(31 downto 0);

    signal s_ip_rx_dst_ip         :  std_logic_vector(31 downto 0);

    signal s_ip_rx_data_len       :  std_logic_vector(15 downto 0);

    signal s_ip_rx_protocol       :  std_logic_vector(7 downto 0);

    signal s_ip_rx_broadcast      :  std_logic;

    signal s_ip_rx_err_out_udp        :  std_logic_vector (3 downto 0);

    signal s_ip_tx_err_out_udp        :  std_logic_vector (3 downto 0);

    signal s_arp_rx_err_out_udp       :  std_logic_vector (3 downto 0);

        -------- for transfer Tx data from UDP to IP layer---------------

        signal s_ip_tx_start          :  std_logic;

        signal s_ip_tx_rdy            :  std_logic;

        signal s_ip_tx_din                :  std_logic_vector(7 downto 0);

        -------- for transfer Tx header data from UDP to IP layer--------

        signal s_ip_tx_src_ip         :  std_logic_vector(31 downto 0);

        signal s_ip_tx_dst_ip         :  std_logic_vector(31 downto 0);

        signal s_ip_tx_src_mac        :  std_logic_vector(47 downto 0);

        signal s_ip_tx_data_len       :  std_logic_vector(15 downto 0);

        signal s_ip_tx_protocol       :  std_logic_vector(7 downto 0);

        -----------------------------------------------------------------

--======================================================================================================

--============================= IP Signals =============================================================

  signal s_ip_mac_tx_tvalid    : std_logic;

  signal s_ip_mac_tx_tlast     : std_logic;

  signal s_ip_mac_tx_tdata     : std_logic_vector(7 downto 0);

  signal s_ip_mac_tx_req       : std_logic;

  signal s_ip_mac_tx_granted   : std_logic;

  signal s_arp_mac_tx_tvalid   : std_logic;

  signal s_arp_mac_tx_tlast    : std_logic;

  signal s_arp_mac_tx_tdata    : std_logic_vector(7 downto 0);

  signal s_arp_mac_tx_req      : std_logic;

  signal s_arp_mac_tx_granted  : std_logic;

  signal s_ping_mac_tx_tvalid   : std_logic;

  signal s_ping_mac_tx_tlast    : std_logic;

  signal s_ping_mac_tx_tdata    : std_logic_vector(7 downto 0);

  signal s_ping_mac_tx_req      : std_logic;

  signal s_ping_mac_tx_granted  : std_logic;

  signal s_lookup_req          : std_logic;

  signal s_lookup_ip           : std_logic_vector(31 downto 0);

  signal s_lookup_mac_addr     : std_logic_vector(47 downto 0);

  signal s_lookup_mac_got      : std_logic;

  signal s_lookup_mac_err      : std_logic;

  signal s_no_ping_packet      : std_logic;

  signal s_ip_rx_err_out            : std_logic_vector(3 downto 0);

  --======================================================================================================

  --============================= IP4_TX Signals ==========================================================

  type t_tx_ip_state_type   is (IDLE,WAIT_MAC_ADDR,WAIT_CHN,SEND_DATA);

  type t_crc_state_type  is (IDLE, TOT_LEN, ID, FLAGS, TTL, CKS, SAH, SAL, DAH, DAL, ADDOVF, FINAL, WAIT_END);

  signal st_crc_state     : t_crc_state_type:=IDLE;

  signal s_tx_hdr_cks    : std_logic_vector (23 downto 0):=(others=>'0');

  signal s_cal_cheksum   : std_logic:='0';

  signal st_tx_ip_state      : t_tx_ip_state_type:=IDLE;

  signal s_cnt_ip_tx      : std_logic_vector (15 downto 0):=(others=>'0');

  signal s_dst_mac_addr  : std_logic_vector (47 downto 0); -- arp block updats this signal

  signal s_total_length  : std_logic_vector (15 downto 0); -- s_total_length is i_data_length+20(ip header) 

  signal s_ip_header     : std_logic_vector (7 downto 0):=(others=>'0');

  --========================================================================================================

  --============================ IP4_RX  Signals============================================================

  type t_rx_ip_state_type is (IDLE,ETH_H,IP_H,USER_DATA,WAIT_END);

  signal st_RX_IP_STATE         : t_rx_ip_state_type:=IDLE;

  signal s_cnt_ip_rx         : std_logic_vector (15 downto 0):=x"0001";

  signal s_src_ip_ip_rx         : std_logic_vector (31 downto 0):=(others=>'0');

  signal s_dst_ip_ip_rx         : std_logic_vector (31 downto 0):=(others=>'0');

  signal s_data_len_ip_rx       : std_logic_vector (15 downto 0):=(others=>'0');

  signal s_protocol_ip_rx       : std_logic_vector (7 downto 0) :=(others=>'0');

  signal s_broadcast_ip_rx      : std_logic;

  --========================================================================================================

--==================================== ARP Signals ==========================================================

type         t_arp_state_type is     (IDLE,LOOK_UP,WAIT_PC_REPLY);

signal       st_ARP_STATE             : t_arp_state_type:=IDLE;

signal       s_timeout_wait_reply_cnt           : std_logic_vector(31 downto 0):=(others=>'0');

signal       s_error_cnt             : std_logic_vector(3 downto 0):=(others=>'0');

--ARP_TX Signals

signal       s_dst_ip_addr_pc      : std_logic_vector(31 downto 0):=(others=>'0');

signal       s_dst_mac_addr_pc     : std_logic_vector(47 downto 0):=(others=>'0');

signal       s_dst_ip_addr_lookup  : std_logic_vector(31 downto 0):=(others=>'0');

signal       s_fpga_req_tx         : std_logic:='0';

signal       s_pc_req_tx           : std_logic:='0';

--ARP_RX Signals

signal       s_ip_addr0            : std_logic_vector(31 downto 0);

signal       s_mac_addr0           : std_logic_vector(47 downto 0);

signal       s_addr_valid0         : std_logic;

signal       s_pc_reply_rx         : std_logic;

signal       s_pc_req_rx           : std_logic;

--===========================================================================================================

--=============================== ARP RX Signals ============================================================

type t_rx_arp_state_type is       (IDLE,ETH_H,ARP_DATA,WAIT_END);

signal st_RX_ARP_STATE             : t_rx_arp_state_type:=IDLE;

signal s_cnt_arp_rx             : std_logic_vector (15 downto 0):=x"0001";

signal s_dst_ip            : std_logic_vector (31 downto 0):=(others=>'0');

signal s_operation         : std_logic_vector (15 downto 0):=(others=>'0');

signal s_addr_valid        : std_logic:='0';

signal s_pc_req            : std_logic:='0';

signal s_pc_reply          : std_logic:='0';

signal s_src_mac_arp_rx            : std_logic_vector (47 downto 0):=(others=>'0');

signal s_src_ip_arp_rx             : std_logic_vector (31 downto 0):=(others=>'0');

signal s_addr_valid_pulse   : std_logic:='0';

signal s_pc_req_pulse       : std_logic:='0';

signal s_pc_reply_pulse     : std_logic:='0';

signal s_trans_data_pulse   : std_logic:='0';

--===========================================================================================================

--=================================== ARP LOOKUP_TABLE Signals ==============================================

signal   s_timeout_lookup_table_cnt        : std_logic_vector(31 downto 0):=(others=>'0');

signal   s_din              : std_logic_vector(82 downto 0):=(others=>'0');

signal   s_wr_en            : std_logic;

signal   s_dout             : std_logic_vector(82 downto 0):=(others=>'0');

signal   s_valid            : std_logic;

signal   s_empty              : std_logic;

signal   s_notempty           : std_logic;

signal   s_mac_addr_out     : std_logic_vector(47 downto 0):=(others=>'0');

signal   s_ip_addr_out      : std_logic_vector(31 downto 0):=(others=>'0');

signal   s_addr_valid_out   : std_logic:='0';

signal   s_request_out      : std_logic:='0';

signal   s_reply_out        : std_logic:='0';

--============================================================================================================

--============================ ARP TX Signals ================================================================

type t_arp_tx_state_type   is (IDLE,WAIT_CHN,SEND_DATA);

signal st_tx_arp_state          : t_arp_tx_state_type:=IDLE;

signal s_cnt_arp_tx          : std_logic_vector (7 downto 0):=(others=>'0');

signal s_arp_type          : std_logic_vector (15 downto 0):=(others=>'0');

signal s_dst_ip_addr     : std_logic_vector (31 downto 0):=(others=>'0');

signal s_dst_mac_addr1   : std_logic_vector (47 downto 0):=(others=>'0');

signal s_dst_mac_addr2   : std_logic_vector (47 downto 0):=(others=>'0');

--============================================================================================================

--============================== PING Signals =================================================================

--for Delayed Inputs

signal   s_mac_data_in_r        : std_logic_vector (7 downto 0);

signal   s_mac_data_in_valid_r  : std_logic;

signal   s_mac_data_in_last_r   : std_logic;

--Sync_fifo_ping Signals

signal   s_ip_rx_in          : std_logic_vector(14 downto 0);

signal   s_ip_rx_out         : std_logic_vector(14 downto 0):=(others=>'0');

signal   s_mac_data_in          : std_logic_vector(7 downto 0);

signal   s_mac_data_in_valid  : std_logic;

signal   s_mac_data_in_last   : std_logic;

signal   s_mac_data_in_last_d : std_logic;

signal   s_ip_rx_err_in       : std_logic_vector(3 downto 0);

signal   s_no_ping_data     : std_logic;

signal   s_empty_sync_fifo    : std_logic:='0';

signal   s_not_empty_sync_fifo: std_logic;

--Data_fifo_ping Signals

signal   s_rst_fifo_ping     : std_logic:='1';

signal   s_wr_en_fifo_ping   : std_logic:='0';

signal   s_din_fifo_ping     : std_logic_vector(7 downto 0):=(others=>'0');

signal   s_rd_en_fifo_ping   : std_logic;

signal   s_dout_fifo_ping    : std_logic_vector(7 downto 0);

--Checksum Signals

signal   s_checksum_data_out   : std_logic_vector(15 downto 0);

signal   s_checksum_data_in    : std_logic_vector(7 downto 0);

signal   s_checksum_start_calc : std_logic:='0';

signal   s_checksum_stop_calc  : std_logic:='0';

--st_PING_STATE Machine Process Signals 

type     t_ping_state            is (IDLE,ACQUIRE_DATA,WAIT_END,WAIT_CHN,SEND_DATA);

signal   st_PING_STATE               : t_ping_state:=IDLE;

signal   s_wr_cnt              : std_logic_vector(7 downto 0):=(others=>'0');

signal   s_rd_cnt              : std_logic_vector(7 downto 0):=(others=>'0');

signal   s_start_send          : std_logic;

signal   s_src_mac_ping           : std_logic_vector(47 downto 0):=(others=>'0');

signal   s_dst_mac_ping           : std_logic_vector(47 downto 0):=(others=>'0');

signal   s_src_ip_ping            : std_logic_vector(31 downto 0):=(others=>'0');

signal   s_dst_ip_ping            : std_logic_vector(31 downto 0):=(others=>'0');

--=================================================================================================================

--================================= Ping Checksum Calc Signals ====================================================

type        t_checksum_state   is   (IDLE,CALC);

signal      st_checksum_state      : t_checksum_state:=IDLE;

signal      s_flag       : std_logic:='0';

signal      s_din_r      : std_logic_vector(7 downto 0);

signal      s_sum        : std_logic_vector(31 downto 0):=(others=>'0');

--=================================================================================================================

--============================ TX_Arbitior Signals =====================================================================

type   t_state_type is       (IDLE,DATA_REQ,ARP_REQ,PING_REQ);

signal st_STATE               : t_state_type:=IDLE;

--======================================================================================================================

--============================ UDP RX Signals ===========================================================================

  type t_rx_udp_state_type is  (IDLE, UDP_HDR, USER_DATA, WAIT_END);

  signal st_RX_UDP_STATE         : t_rx_udp_state_type:=IDLE;

  signal s_cnt_udp_rx         : std_logic_vector (15 downto 0):=x"0001";

  signal s_src_ip_udp_rx  : std_logic_vector (31 downto 0):=(others=>'0');

  signal s_src_port       : std_logic_vector (15 downto 0):=(others=>'0');

  signal s_dst_port       : std_logic_vector (15 downto 0):=(others=>'0');

  signal s_data_len_udp_rx       : std_logic_vector (15 downto 0):=(others=>'0');

  signal s_err_out        : std_logic_vector (3 downto 0) :=(others=>'0');

 --======================================================================================================================= 

 --============================ UDP TX Signals =============================================================================

  type t_tx_udp_state_type     is (IDLE,SEND_DATA);

  signal st_tx_udp_state        : t_tx_udp_state_type:=IDLE;

  signal s_cnt_udp_tx        : std_logic_vector (15 downto 0):=(others=>'0');

  signal s_ip_data_len   : std_logic_vector (15 downto 0);

  signal s_udp_header      : std_logic_vector (7 downto 0):=(others=>'0');

--==========================================================================================================================

--============================ PHY_Interface Signals =======================================================================

signal s_gmii_col_reg         : std_logic;

signal s_gmii_col_reg_reg     : std_logic;

signal s_gmii_rx_clk          : std_logic;

--==========================================================================================================================

--=========================== Ping_Pong Fifo Signals =======================================================================

signal s_empty1              : std_logic;

signal s_empty2              : std_logic;

signal s_notempty1           : std_logic;

signal s_notempty2           : std_logic;

signal s_data_m              : std_logic_vector(7 downto 0);

signal s_valid_m             : std_logic;

signal s_last_m              : std_logic;

signal s_wr_en_a             : std_logic:='0';

signal s_din_a               : std_logic_vector(7 downto 0):=(others=>'0');

signal s_rd_en_a             : std_logic;

signal s_dout_a              : std_logic_vector(7 downto 0);

signal s_valid_a             : std_logic;

signal s_empty_a             : std_logic;

signal s_wr_en_b             : std_logic:='0';

signal s_din_b               : std_logic_vector(7 downto 0):=(others=>'0');

signal s_rd_en_b             : std_logic;

signal s_dout_b              : std_logic_vector(7 downto 0);

signal s_valid_b             : std_logic;

signal s_empty_b             : std_logic;

signal s_cnt_a               : std_logic_vector(15 downto 0):=(others=>'0');

signal s_cnt_b               : std_logic_vector(15 downto 0):=(others=>'0');

signal s_rd_cnt_a            : std_logic_vector(15 downto 0):=(others=>'0');

signal s_rd_cnt_b            : std_logic_vector(15 downto 0):=(others=>'0');

signal s_busy_a              : std_logic:='0';

signal s_busy_b              : std_logic:='0';

signal s_last_a              : std_logic:='0';

signal s_last_b              : std_logic:='0';

signal s_dout_len          : std_logic_vector(15 downto 0);

type        t_pingpong_state     is (wait_data,rd_fifo_a,rd_fifo_b);

signal      st_ping_pong_state          : t_pingpong_state:=wait_data;

--========================================================================================================================= 

        begin

        o_src_ip           <= s_src_ip_ip_rx   ;

        o_dst_ip           <= s_dst_ip_ip_rx   ;

        o_data_len         <= s_data_len_ip_rx ;

        o_protocol         <= s_protocol_ip_rx ;

        o_broadcast        <= s_broadcast_ip_rx;

--============================== Recieve IP Data ===================================================================================

p_recieve_data:process(i_rx_clk)

begin

if(rising_edge(i_rx_clk)) then

        o_no_ping_packet        <= '0';

if (i_reset='1') then

    st_RX_IP_STATE              <= IDLE;

         s_cnt_ip_rx                    <= x"0001";

        --status 

        s_src_ip_ip_rx                  <= (others => '0');

   s_dst_ip_ip_rx               <= (others => '0');

        s_data_len_ip_rx                <= (others => '0');

   s_protocol_ip_rx             <= (others => '0');

        s_broadcast_ip_rx               <= '0';

        --data to ip layer

        o_ip_dout                       <= (others => '0');

   o_ip_dout_rdy                        <= '0' ;

   o_ip_data_last                       <= '0' ;

        --error status

        o_ip_rx_err_out                 <= (others => '0');

else

        o_ip_dout                       <= (others => '0');

   o_ip_dout_rdy                        <= '0' ;

   o_ip_data_last                       <= '0' ;

   CASE st_RX_IP_STATE IS

      --************************************************************************************************************************************

          WHEN IDLE =>

              s_cnt_ip_rx               <= x"0001";

                   --status

--                      s_src_ip_ip_rx       <= (others => '0');

--         s_dst_ip_ip_rx       <= (others => '0');

--                 s_data_len_ip_rx     <= (others => '0');

--         s_protocol_ip_rx     <= (others => '0');

--            s_broadcast_ip_rx    <= '0';         

                   --error status

                   o_ip_rx_err_out      <= (others => '0');

                   if ( i_mac_data_in_valid = '1') then

                            s_cnt_ip_rx         <= s_cnt_ip_rx+1;

                                 st_RX_IP_STATE   <= ETH_H;

                   end if;

       --************************************************************************************************************************************

      WHEN ETH_H =>

               if ( i_mac_data_in_valid = '1') then

                        s_cnt_ip_rx     <= s_cnt_ip_rx+1;

                            ---------- Cheking Type ------------------------------

             if(s_cnt_ip_rx= 13) then

                if i_mac_data_in /= x"08" then

                   o_ip_rx_err_out      <= x"1";

                                       st_RX_IP_STATE   <= WAIT_END;

                end if;

                            end if;

                            ---------- Cheking Type ------------------------------         

            if(s_cnt_ip_rx= 14) then

                st_RX_IP_STATE          <= IP_H;

                                   if i_mac_data_in /= x"00" then

                                      o_ip_rx_err_out   <= x"1";

                                      st_RX_IP_STATE    <= WAIT_END;

               end if;