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[/] [udp_ip_stack/] [trunk/] [rtl/] [vhdl/] [IPv4.vhd] - Blame information for rev 4

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----------------------------------------------------------------------------------
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-- Company: 
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-- Engineer:            Peter Fall
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-- 
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-- Create Date:    16:20:42 06/01/2011 
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-- Design Name: 
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-- Module Name:    IPv4 - Behavioral 
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-- Project Name: 
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-- Target Devices: 
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-- Tool versions: 
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-- Description: 
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--              handle simple IP RX and TX
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--              doesnt handle seg & reass
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--              dest MAC addr resolution through ARP layer
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--              Handle IPv4 protocol
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--              Respond to ARP requests and replies
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--              Ignore pkts that are not IP
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--              Ignore pkts that are not addressed to us--
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-- Dependencies: 
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--
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-- Revision: 
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-- Revision 0.01 - File Created
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-- Revision 0.02 - separated RX and TX clocks
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-- Revision 0.03 - Added mac_data_out_first
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-- Additional Comments: 
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--
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----------------------------------------------------------------------------------
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LIBRARY ieee;
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USE ieee.std_logic_1164.ALL;
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use IEEE.NUMERIC_STD.ALL;
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use work.axi.all;
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use work.ipv4_types.all;
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use work.arp_types.all;
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entity IPv4 is
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    Port (
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                        -- IP Layer signals
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                        ip_tx_start                             : in std_logic;
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                        ip_tx                                           : in ipv4_tx_type;                                                              -- IP tx cxns
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                        ip_tx_result                    : out std_logic_vector (1 downto 0);             -- tx status (changes during transmission)
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                        ip_tx_data_out_ready    : out std_logic;                                                                        -- indicates IP TX is ready to take data
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                        ip_rx_start                             : out std_logic;                                                                        -- indicates receipt of ip frame.
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                        ip_rx                                           : out ipv4_rx_type;
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                        -- system control signals
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                        rx_clk                                  : in  STD_LOGIC;
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                        tx_clk                                  : in  STD_LOGIC;
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                        reset                                   : in  STD_LOGIC;
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                        our_ip_address          : in STD_LOGIC_VECTOR (31 downto 0);
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                        our_mac_address                 : in std_logic_vector (47 downto 0);
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                        -- system status signals
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                        rx_pkt_count                    : out STD_LOGIC_VECTOR(7 downto 0);                      -- number of IP pkts received for us
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                        -- ARP lookup signals
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                        arp_req_req                             : out arp_req_req_type;
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                        arp_req_rslt                    : in arp_req_rslt_type;
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                        -- MAC layer RX signals
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                        mac_data_in                     : in  STD_LOGIC_VECTOR (7 downto 0);             -- ethernet frame (from dst mac addr through to last byte of frame)
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                        mac_data_in_valid       : in  STD_LOGIC;                                                                        -- indicates data_in valid on clock
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                        mac_data_in_last                : in  STD_LOGIC;                                                                        -- indicates last data in frame
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                        -- MAC layer TX signals
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                        mac_tx_req                              : out std_logic;                                                                        -- indicates that ip wants access to channel (stays up for as long as tx)
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                        mac_tx_granted                  : in std_logic;                                                                 -- indicates that access to channel has been granted            
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                        mac_data_out_ready      : in std_logic;                                                                 -- indicates system ready to consume data
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                        mac_data_out_valid      : out std_logic;                                                                        -- indicates data out is valid
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                        mac_data_out_first      : out std_logic;                                                                        -- with data out valid indicates the first byte of a frame
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                        mac_data_out_last               : out std_logic;                                                                        -- with data out valid indicates the last byte of a frame
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                        mac_data_out                    : out std_logic_vector (7 downto 0)                      -- ethernet frame (from dst mac addr through to last byte of frame)      
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                        );
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end IPv4;
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architecture structural of IPv4 is
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    COMPONENT IPv4_TX
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    PORT(
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                        -- IP Layer signals
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                        ip_tx_start                             : in std_logic;
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                        ip_tx                                           : in ipv4_tx_type;                                                              -- IP tx cxns
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                        ip_tx_result                    : out std_logic_vector (1 downto 0);             -- tx status (changes during transmission)
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                        ip_tx_data_out_ready    : out std_logic;                                                                        -- indicates IP TX is ready to take data
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                        -- system signals
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                        clk                                             : in  STD_LOGIC;                                                                        -- same clock used to clock mac data and ip data
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                        reset                                   : in  STD_LOGIC;
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                        our_ip_address          : in STD_LOGIC_VECTOR (31 downto 0);
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                        our_mac_address                 : in std_logic_vector (47 downto 0);
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                        -- ARP lookup signals
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                        arp_req_req                             : out arp_req_req_type;
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                        arp_req_rslt                    : in arp_req_rslt_type;
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                        -- MAC layer TX signals
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                        mac_tx_req                              : out std_logic;                                                                        -- indicates that ip wants access to channel (stays up for as long as tx)
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                        mac_tx_granted                  : in std_logic;                                                                 -- indicates that access to channel has been granted            
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                        mac_data_out_ready      : in std_logic;                                                                 -- indicates system ready to consume data
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                        mac_data_out_valid      : out std_logic;                                                                -- indicates data out is valid
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                        mac_data_out_first      : out std_logic;                                                                        -- with data out valid indicates the first byte of a frame
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                        mac_data_out_last               : out std_logic;                                                                        -- with data out valid indicates the last byte of a frame
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                        mac_data_out                    : out std_logic_vector (7 downto 0)              -- ethernet frame (from dst mac addr through to last byte of frame)      
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        );
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    END COMPONENT;
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    COMPONENT IPv4_RX
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    PORT(
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                        -- IP Layer signals
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                        ip_rx                                           : out ipv4_rx_type;
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                        ip_rx_start                             : out std_logic;                                                                        -- indicates receipt of ip frame.
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                        -- system signals
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                        clk                                             : in  STD_LOGIC;
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                        reset                                   : in  STD_LOGIC;
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                        our_ip_address          : in STD_LOGIC_VECTOR (31 downto 0);
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                        rx_pkt_count                    : out STD_LOGIC_VECTOR(7 downto 0);                      -- number of IP pkts received for us
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                        -- MAC layer RX signals
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                        mac_data_in                     : in  STD_LOGIC_VECTOR (7 downto 0);             -- ethernet frame (from dst mac addr through to last byte of frame)
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                        mac_data_in_valid       : in  STD_LOGIC;                                                                        -- indicates data_in valid on clock
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                        mac_data_in_last                : in  STD_LOGIC                                                                 -- indicates last data in frame
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       );
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    END COMPONENT;
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begin
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   TX : IPv4_TX PORT MAP (
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          ip_tx_start                   => ip_tx_start,
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          ip_tx                                         => ip_tx,
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          ip_tx_result                  => ip_tx_result,
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          ip_tx_data_out_ready=> ip_tx_data_out_ready,
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          clk                                           => tx_clk,
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          reset                                         => reset,
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          our_ip_address                => our_ip_address,
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          our_mac_address               => our_mac_address,
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          arp_req_req                   => arp_req_req,
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          arp_req_rslt                  => arp_req_rslt,
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          mac_tx_req                    => mac_tx_req,
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          mac_tx_granted                => mac_tx_granted,
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          mac_data_out_ready    => mac_data_out_ready,
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          mac_data_out_valid    => mac_data_out_valid,
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          mac_data_out_first    => mac_data_out_first,
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          mac_data_out_last     => mac_data_out_last,
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          mac_data_out                  => mac_data_out
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        );
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   RX : IPv4_RX PORT MAP (
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          ip_rx                                         => ip_rx,
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          ip_rx_start                   => ip_rx_start,
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          clk                                           => rx_clk,
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          reset                                         => reset,
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          our_ip_address                => our_ip_address,
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                         rx_pkt_count                   => rx_pkt_count,
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          mac_data_in                   => mac_data_in,
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          mac_data_in_valid     => mac_data_in_valid,
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          mac_data_in_last      => mac_data_in_last
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        );
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end structural;
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