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
	 generic (
			CLOCK_FREQ			: integer := 125000000;							-- freq of data_in_clk -- needed to timout cntr
			ARP_TIMEOUT			: integer := 60									-- ARP response timeout (s)
			);
    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);
			control					: in ip_control_type;
			-- 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
	 generic (
			CLOCK_FREQ			: integer := 125000000;							-- freq of data_in_clk -- needed to timout cntr
			ARP_TIMEOUT			: integer := 60									-- ARP response timeout (s)
			);
    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);
			control				: in arp_control_type;
			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
			generic map (
			 CLOCK_FREQ			=> CLOCK_FREQ,
			 ARP_TIMEOUT		=> ARP_TIMEOUT
			 )
			 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,
			  control						=> control.arp_controls,
			  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;