Subversion Repositories udp_ip_stack

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

-- Company: 

-- Engineer: 

-- 

-- Create Date:    12:43:16 06/04/2011 

-- Design Name: 

-- Module Name:    IP_complete_nomac - Behavioral 

-- Project Name: 

-- Target Devices: 

-- Tool versions: 

-- Description: Implements complete IP stack with ARP (but no MAC)

--

-- Dependencies: 

--

-- Revision: 

-- Revision 0.01 - File Created

-- Revision 0.02 - separated RX and TX clocks

-- Revision 0.03 - Added mac_tx_tfirst

-- Additional Comments: 

--

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

LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

use IEEE.NUMERIC_STD.ALL;

use work.axi.all;

use work.ipv4_types.all;

use work.arp_types.all;

entity IP_complete_nomac is

    Port (

                        -- IP Layer signals

                        ip_tx_start                             : in std_logic;

                        ip_tx                                           : in ipv4_tx_type;                                                              -- IP tx cxns

                        ip_tx_result                    : out std_logic_vector (1 downto 0);             -- tx status (changes during transmission)

                        ip_tx_data_out_ready    : out std_logic;                                                                        -- indicates IP TX is ready to take data

                        ip_rx_start                             : out std_logic;                                                                        -- indicates receipt of ip frame.

                        ip_rx                                           : out ipv4_rx_type;

                        -- system signals

                        rx_clk                                  : in  STD_LOGIC;

                        tx_clk                                  : in  STD_LOGIC;

                        reset                                   : in  STD_LOGIC;

                        our_ip_address          : in STD_LOGIC_VECTOR (31 downto 0);

                        our_mac_address                 : in std_logic_vector (47 downto 0);

                        -- status signals

                        arp_pkt_count                   : out STD_LOGIC_VECTOR(7 downto 0);                      -- count of arp pkts received

                        ip_pkt_count                    : out STD_LOGIC_VECTOR(7 downto 0);                      -- number of IP pkts received for us

                        -- MAC Transmitter

                        mac_tx_tdata         : out  std_logic_vector(7 downto 0);        -- data byte to tx

                        mac_tx_tvalid        : out  std_logic;                                                  -- tdata is valid

                        mac_tx_tready        : in std_logic;                                                    -- mac is ready to accept data

                        mac_tx_tfirst        : out  std_logic;                                                  -- indicates first byte of frame

                        mac_tx_tlast         : out  std_logic;                                                  -- indicates last byte of frame

                        -- MAC Receiver

                        mac_rx_tdata         : in std_logic_vector(7 downto 0);  -- data byte received

                        mac_rx_tvalid        : in std_logic;                                                    -- indicates tdata is valid

                        mac_rx_tready        : out  std_logic;                                                  -- tells mac that we are ready to take data

                        mac_rx_tlast         : in std_logic                                                             -- indicates last byte of the trame

                        );

end IP_complete_nomac;

architecture structural of IP_complete_nomac is

    COMPONENT IPv4

    PORT(

                        -- IP Layer signals

                        ip_tx_start                             : in std_logic;

                        ip_tx                                           : in ipv4_tx_type;                                                              -- IP tx cxns

                        ip_tx_result                    : out std_logic_vector (1 downto 0);             -- tx status (changes during transmission)

                        ip_tx_data_out_ready    : out std_logic;                                                                        -- indicates IP TX is ready to take data

                        ip_rx_start                             : out std_logic;                                                                        -- indicates receipt of ip frame.

                        ip_rx                                           : out ipv4_rx_type;

                        -- system control signals

                        rx_clk                                  : in  STD_LOGIC;

                        tx_clk                                  : in  STD_LOGIC;

                        reset                                   : in  STD_LOGIC;

                        our_ip_address          : in STD_LOGIC_VECTOR (31 downto 0);

                        our_mac_address                 : in std_logic_vector (47 downto 0);

                        -- system status signals

                        rx_pkt_count                    : out STD_LOGIC_VECTOR(7 downto 0);                      -- number of IP pkts received for us

                        -- ARP lookup signals

                        arp_req_req                             : out arp_req_req_type;

                        arp_req_rslt                    : in arp_req_rslt_type;

                        -- MAC layer RX signals

                        mac_data_in                     : in  STD_LOGIC_VECTOR (7 downto 0);             -- ethernet frame (from dst mac addr through to last byte of frame)

                        mac_data_in_valid       : in  STD_LOGIC;                                                                        -- indicates data_in valid on clock

                        mac_data_in_last                : in  STD_LOGIC;                                                                        -- indicates last data in frame

                        -- MAC layer TX signals

                        mac_tx_req                              : out std_logic;                                                                        -- indicates that ip wants access to channel (stays up for as long as tx)

                        mac_tx_granted                  : in std_logic;                                                                 -- indicates that access to channel has been granted            

                        mac_data_out_ready      : in std_logic;                                                                 -- indicates system ready to consume data

                        mac_data_out_valid      : out std_logic;                                                                        -- indicates data out is valid

                        mac_data_out_first      : out std_logic;                                                                        -- with data out valid indicates the first byte of a frame

                        mac_data_out_last               : out std_logic;                                                                        -- with data out valid indicates the last byte of a frame

                        mac_data_out                    : out std_logic_vector (7 downto 0)                      -- ethernet frame (from dst mac addr through to last byte of frame)      

         );

         END COMPONENT;

    COMPONENT arp

    PORT(

                        -- lookup request signals

                        arp_req_req                     : in arp_req_req_type;

                        arp_req_rslt            : out arp_req_rslt_type;

                        -- MAC layer RX signals

                        data_in_clk             : in  STD_LOGIC;

                        reset                           : in  STD_LOGIC;

                        data_in                                 : in  STD_LOGIC_VECTOR (7 downto 0);             -- ethernet frame (from dst mac addr through to last byte of frame)

                        data_in_valid           : in  STD_LOGIC;                                                                        -- indicates data_in valid on clock

                        data_in_last            : in  STD_LOGIC;                                                                        -- indicates last data in frame

                        -- MAC layer TX signals

                        mac_tx_req                      : out std_logic;                                                                        -- indicates that ip wants access to channel (stays up for as long as tx)

                        mac_tx_granted          : in std_logic;                                                                 -- indicates that access to channel has been granted            

                        data_out_clk            : in std_logic;

                        data_out_ready          : in std_logic;                                                                 -- indicates system ready to consume data

                        data_out_valid          : out std_logic;                                                                        -- indicates data out is valid

                        data_out_first          : out std_logic;                                                                        -- with data out valid indicates the first byte of a frame

                        data_out_last           : out std_logic;                                                                        -- with data out valid indicates the last byte of a frame

                        data_out                                : out std_logic_vector (7 downto 0);             -- ethernet frame (from dst mac addr through to last byte of frame)

                        -- system signals

                        our_mac_address         : in STD_LOGIC_VECTOR (47 downto 0);

                        our_ip_address  : in STD_LOGIC_VECTOR (31 downto 0);

                        req_count                       : out STD_LOGIC_VECTOR(7 downto 0)                       -- count of arp pkts received

         );

         END COMPONENT;

    COMPONENT tx_arbitrator

    PORT(

                clk                             : in std_logic;

                reset                           : in std_logic;

                req_1                           : in  std_logic;

                grant_1                 : out std_logic;

      data_1         : in  std_logic_vector(7 downto 0); -- data byte to tx

      valid_1        : in  std_logic;                                                   -- tdata is valid

      first_1        : in  std_logic;                                                   -- indicates first byte of frame

      last_1         : in  std_logic;                                                   -- indicates last byte of frame

                req_2                           : in  std_logic;

                grant_2                 : out std_logic;

      data_2         : in  std_logic_vector(7 downto 0); -- data byte to tx

      valid_2        : in  std_logic;                                                   -- tdata is valid

      first_2        : in  std_logic;                                                   -- indicates first byte of frame

      last_2         : in  std_logic;                                                   -- indicates last byte of frame

      data              : out  std_logic_vector(7 downto 0);     -- data byte to tx

      valid             : out  std_logic;                                                       -- tdata is valid

      first             : out  std_logic;                                                       -- indicates first byte of frame

      last              : out  std_logic                                                        -- indicates last byte of frame

         );

         END COMPONENT;

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

        -- Signals

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

        -- ARP REQUEST

        signal arp_req_req_int          : arp_req_req_type;

        signal arp_req_rslt_int         : arp_req_rslt_type;

        -- MAC arbitration busses

        signal ip_mac_req                               : std_logic;

        signal ip_mac_grant                     : std_logic;

        signal ip_mac_data_out          : std_logic_vector (7 downto 0);

        signal ip_mac_valid                     : std_logic;

        signal ip_mac_first                     : std_logic;

        signal ip_mac_last                      : std_logic;

        signal arp_mac_req                      : std_logic;

        signal arp_mac_grant                    : std_logic;

        signal arp_mac_data_out         : std_logic_vector (7 downto 0);

        signal arp_mac_valid                    : std_logic;

        signal arp_mac_first                    : std_logic;

        signal arp_mac_last                     : std_logic;

        -- MAC RX bus

        signal mac_rx_tready_int        : std_logic;

        -- MAC TX bus

        signal mac_tx_tdata_int         : std_logic_vector (7 downto 0);

        signal mac_tx_tvalid_int        : std_logic;

        signal mac_tx_tfirst_int        : std_logic;

        signal mac_tx_tlast_int         : std_logic;

        -- control signals

        signal mac_tx_granted_int       : std_logic;

begin

        mac_rx_tready_int <= '1';               -- enable the mac receiver

        -- set followers

        mac_tx_tdata <= mac_tx_tdata_int;

        mac_tx_tvalid <= mac_tx_tvalid_int;

        mac_tx_tfirst <= mac_tx_tfirst_int;

        mac_tx_tlast <= mac_tx_tlast_int;

        mac_rx_tready <= mac_rx_tready_int;

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

   -- Instantiate the IP layer

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

    IP_layer : IPv4 PORT MAP

                (

          ip_tx_start                   => ip_tx_start,

          ip_tx                                         => ip_tx,

          ip_tx_result                  => ip_tx_result,

          ip_tx_data_out_ready=> ip_tx_data_out_ready,

          ip_rx_start                   => ip_rx_start,

          ip_rx                                         => ip_rx,

          rx_clk                                        => rx_clk,

          tx_clk                                        => tx_clk,

          reset                                         => reset,

          our_ip_address                => our_ip_address,

          our_mac_address               => our_mac_address,

                         rx_pkt_count                   => ip_pkt_count,

          arp_req_req                   => arp_req_req_int,

          arp_req_rslt                  => arp_req_rslt_int,

          mac_tx_req                    => ip_mac_req,

          mac_tx_granted                => ip_mac_grant,

          mac_data_out_ready    => mac_tx_tready,

          mac_data_out_valid    => ip_mac_valid,

                         mac_data_out_first     => ip_mac_first,

          mac_data_out_last     => ip_mac_last,

          mac_data_out                  => ip_mac_data_out,

          mac_data_in                   => mac_rx_tdata,

          mac_data_in_valid     => mac_rx_tvalid,

          mac_data_in_last      => mac_rx_tlast

        );

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

   -- Instantiate the ARP layer

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

        arp_layer : arp

                 Port map(

                        -- request signals

                          arp_req_req                                   => arp_req_req_int,

                          arp_req_rslt                                  => arp_req_rslt_int,

                          -- rx signals

                          data_in_clk                   => rx_clk,

                          reset                         => reset,

                          data_in                       => mac_rx_tdata,

                          data_in_valid                 => mac_rx_tvalid,

                          data_in_last                  => mac_rx_tlast,

                          -- tx signals

                          mac_tx_req                                    => arp_mac_req,

                          mac_tx_granted                                => arp_mac_grant,

                          data_out_clk                                  => tx_clk,

                          data_out_ready                                => mac_tx_tready,

                          data_out_valid                                => arp_mac_valid,

                          data_out_first                                => arp_mac_first,

                          data_out_last                         => arp_mac_last,

                          data_out                                              => arp_mac_data_out,

                          -- system signals

                          our_mac_address                               => our_mac_address,

                          our_ip_address                                => our_ip_address,

                          req_count                                             => arp_pkt_count

                          );

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

   -- Instantiate the TX Arbitrator 

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

        mac_tx_arb : tx_arbitrator

                 Port map(

                                clk                                             => tx_clk,

                                reset                           => reset,

                                req_1                                                   => ip_mac_req,

                                grant_1                                         => ip_mac_grant,

                                data_1                          => ip_mac_data_out,

                                valid_1                         => ip_mac_valid,

                                first_1                                         => ip_mac_first,

                                last_1                                          => ip_mac_last,

                                req_2                                                   => arp_mac_req,

                                grant_2                                         => arp_mac_grant,

                                data_2                          => arp_mac_data_out,

                                valid_2                         => arp_mac_valid,

                                first_2                                         => arp_mac_first,

                                last_2                                          => arp_mac_last,

                                data                                    => mac_tx_tdata_int,

                                valid                                   => mac_tx_tvalid_int,

                                first                                   => mac_tx_tfirst_int,

                                last                                    => mac_tx_tlast_int

                          );

end structural;