Subversion Repositories udp_ip_stack

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-- Company: 

-- Engineer:            Peter Fall

-- 

-- Create Date:    16:20:42 06/01/2011 

-- Design Name: 

-- Module Name:    IPv4 - Behavioral 

-- Project Name: 

-- Target Devices: 

-- Tool versions: 

-- Description: 

--              handle simple IP RX and TX

--              doesnt handle seg & reass

--              dest MAC addr resolution through ARP layer

--              Handle IPv4 protocol

--              Respond to ARP requests and replies

--              Ignore pkts that are not IP

--              Ignore pkts that are not addressed to us--

-- Dependencies: 

--

-- Revision: 

-- Revision 0.01 - File Created

-- Revision 0.02 - separated RX and TX clocks

-- Additional Comments: 

--

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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 IPv4 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 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_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 IPv4;

architecture structural of IPv4 is

    COMPONENT IPv4_TX

    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

                        -- system control signals

                        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);

                        -- ARP lookup signals

                        arp_req_req                             : out arp_req_req_type;

                        arp_req_rslt                    : in arp_req_rslt_type;

                        -- 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_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 IPv4_RX

    PORT(

                        -- IP Layer signals

                        ip_rx                                           : out ipv4_rx_type;

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

                        -- system signals

                        clk                                             : in  STD_LOGIC;

                        reset                                   : in  STD_LOGIC;

                        our_ip_address          : in STD_LOGIC_VECTOR (31 downto 0);

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

                        -- 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

       );

    END COMPONENT;

begin

   TX : IPv4_TX 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,

          clk                                           => tx_clk,

          reset                                         => reset,

          our_ip_address                => our_ip_address,

          our_mac_address               => our_mac_address,

          arp_req_req                   => arp_req_req,

          arp_req_rslt                  => arp_req_rslt,

          mac_tx_req                    => mac_tx_req,

          mac_tx_granted                => mac_tx_granted,

          mac_data_out_ready    => mac_data_out_ready,

          mac_data_out_valid    => mac_data_out_valid,

          mac_data_out_last     => mac_data_out_last,

          mac_data_out                  => mac_data_out

        );

   RX : IPv4_RX PORT MAP (

          ip_rx                                         => ip_rx,

          ip_rx_start                   => ip_rx_start,

          clk                                           => rx_clk,

          reset                                         => reset,

          our_ip_address                => our_ip_address,

                         rx_pkt_count                   => rx_pkt_count,

          mac_data_in                   => mac_data_in,

          mac_data_in_valid     => mac_data_in_valid,

          mac_data_in_last      => mac_data_in_last

        );

end structural;