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

-- Title      : UDP/IP and LAN91C111 Controller

-- Project    : 

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

-- File       : udp_ip_lan91c111.vhd

-- Author     :   <alhonena@AHVEN>

-- Company    : 

-- Created    : 2011-09-19

-- Last update: 2011-11-07

-- Platform   : 

-- Standard   : VHDL'87

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

-- Description: Direct interface for TX and RX operations on UDP/IP protocol

-- level with external LAN91C111 chip (e.g. Altera Stratix II S180 dev board)

-- This toplevel uses a 16-bit mode of LAN91C111 controller!

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

-- Copyright (c) 2011 

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

-- Revisions  :

-- Date        Version  Author  Description

-- 2011-09-19  1.0      alhonena        Created

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

library ieee;

use ieee.std_logic_1164.all;

entity udp_ip_lan91c111 is

  generic (

    disable_rx_g  : integer := 0;

    disable_arp_g : integer := 0);      -- If you disable ARP, you must provide

                                        -- target MAC address (no_arp_target_MAC_in)

                                        -- with target IP address (target_addr_in)

  port (

    clk               : in  std_logic;  -- 25 MHz clock to ensure proper timing. LAN91C111 is used asynchronously.

    rst_n             : in  std_logic;

    -- to/from application

    -- TX

    new_tx_in         : in  std_logic;

    tx_len_in         : in  std_logic_vector( 10 downto 0 );

    target_addr_in    : in  std_logic_vector( 31 downto 0 );

    -- Use this with target_addr_in when disable_arp_g = 1:

    no_arp_target_MAC_in     : in  std_logic_vector( 47 downto 0 ) := (others => '0');

    target_port_in    : in  std_logic_vector( 15 downto 0 );

    source_port_in    : in  std_logic_vector( 15 downto 0 );

    tx_data_in        : in  std_logic_vector( 15 downto 0 );

    tx_data_valid_in  : in  std_logic;

    tx_re_out         : out std_logic;

    -- RX

    new_rx_out        : out std_logic;

    rx_data_valid_out : out std_logic;

    rx_data_out       : out std_logic_vector( 15 downto 0 );

    rx_re_in          : in  std_logic;

    rx_erroneous_out  : out std_logic;

    source_addr_out   : out std_logic_vector( 31 downto 0 );

    source_port_out   : out std_logic_vector( 15 downto 0 );

    dest_port_out     : out std_logic_vector( 15 downto 0 );

    rx_len_out        : out std_logic_vector( 10 downto 0 );

    rx_error_out      : out std_logic;   -- this means system error, not error

                                        -- in data caused by network etc.

    -- Status:

    link_up_out       : out std_logic;

    fatal_error_out   : out std_logic;  -- Something wrong with LAN91C111.

    -- To the external ethernet chip (SMSC LAN91C111)

    eth_data_inout    : inout std_logic_vector( 31 downto 0 );

    eth_addr_out      : out   std_logic_vector( 14 downto 0 );  -- note that they start indexing from 1! A1 on the datasheet goes to eth_addr_out(0).

    eth_interrupt_in  : in    std_logic;

    eth_read_out      : out   std_logic;

    eth_write_out     : out   std_logic;

    eth_nADS_out      : out   std_logic;

    eth_nAEN_out      : out   std_logic;

    eth_nBE_out       : out   std_logic_vector(3 downto 0)

    );

end udp_ip_lan91c111;

architecture structural of udp_ip_lan91c111 is

  signal tx_data       : std_logic_vector(15 downto 0);

  signal tx_data_valid : std_logic;

  signal tx_re         : std_logic;

  signal rx_re         : std_logic;

  signal rx_data       : std_logic_vector(15 downto 0);

  signal rx_data_valid : std_logic;

  signal target_MAC    : std_logic_vector(47 downto 0);

  signal new_tx        : std_logic;

  signal tx_len        : std_logic_vector(10 downto 0);

  signal tx_frame_type : std_logic_vector(15 downto 0);

  signal new_rx        : std_logic;

  signal rx_len        : std_logic_vector(10 downto 0);

  signal rx_frame_type : std_logic_vector(15 downto 0);

  signal rx_erroneous  : std_logic;

begin  -- structural

  assert not (disable_rx_g = 1 and disable_arp_g = 0) report "RX must be enabled if ARP is enabled" severity failure;

  assert disable_rx_g = 0 or disable_rx_g = 1 report "illegal value of disable_rx_g" severity failure;

  assert disable_arp_g = 0 or disable_arp_g = 1 report "illegal value of disable_arp_g" severity failure;

rx_disable: if disable_rx_g = 1 generate

  lan91c111_controller_1: entity work.lan91c111_controller

    generic map (

      enable_rx_g => '0',

      interface_width_g => 16)

    port map (

      clk               => clk,

      rst_n             => rst_n,

      eth_data_inout    => eth_data_inout,

      eth_addr_out      => eth_addr_out,

      eth_interrupt_in  => eth_interrupt_in,

      eth_read_out      => eth_read_out,

      eth_write_out     => eth_write_out,

      eth_nADS_out      => eth_nADS_out,

      eth_nAEN_out      => eth_nAEN_out,

      eth_nBE_out       => eth_nBE_out,

      tx_data_in        => tx_data,

      tx_data_valid_in  => tx_data_valid,

      tx_re_out         => tx_re,

      rx_re_in          => rx_re,

      rx_data_out       => rx_data,

      rx_data_valid_out => rx_data_valid,

      target_MAC_in     => target_MAC,

      new_tx_in         => new_tx,

      tx_len_in         => tx_len,

      tx_frame_type_in  => tx_frame_type,

      new_rx_out        => new_rx,

      rx_len_out        => rx_len,

      rx_frame_type_out => rx_frame_type,

      rx_erroneous_out  => rx_erroneous,

      ready_out         => link_up_out,

      fatal_error_out   => fatal_error_out);

end generate rx_disable;

rx_enable: if disable_rx_g = 0 generate

  lan91c111_controller_1: entity work.lan91c111_controller

    generic map (

      enable_rx_g => '1',

      interface_width_g => 16)

    port map (

      clk               => clk,

      rst_n             => rst_n,

      eth_data_inout    => eth_data_inout,

      eth_addr_out      => eth_addr_out,

      eth_interrupt_in  => eth_interrupt_in,

      eth_read_out      => eth_read_out,

      eth_write_out     => eth_write_out,

      eth_nADS_out      => eth_nADS_out,

      eth_nAEN_out      => eth_nAEN_out,

      eth_nBE_out       => eth_nBE_out,

      tx_data_in        => tx_data,

      tx_data_valid_in  => tx_data_valid,

      tx_re_out         => tx_re,

      rx_re_in          => rx_re,

      rx_data_out       => rx_data,

      rx_data_valid_out => rx_data_valid,

      target_MAC_in     => target_MAC,

      new_tx_in         => new_tx,

      tx_len_in         => tx_len,

      tx_frame_type_in  => tx_frame_type,

      new_rx_out        => new_rx,

      rx_len_out        => rx_len,

      rx_frame_type_out => rx_frame_type,

      rx_erroneous_out  => rx_erroneous,

      ready_out         => link_up_out,

      fatal_error_out   => fatal_error_out);

end generate rx_enable;

  udp_ip_1: entity work.udp_ip

    generic map (

      disable_rx_g  => disable_rx_g,

      disable_arp_g => disable_arp_g)

    port map (

      clk                  => clk,

      rst_n                => rst_n,

      new_tx_in            => new_tx_in,

      tx_len_in            => tx_len_in,

      target_addr_in       => target_addr_in,

      target_port_in       => target_port_in,

      source_port_in       => source_port_in,

      tx_data_in           => tx_data_in,

      tx_data_valid_in     => tx_data_valid_in,

      tx_re_out            => tx_re_out,

      new_rx_out           => new_rx_out,

      rx_data_valid_out    => rx_data_valid_out,

      rx_data_out          => rx_data_out,

      rx_re_in             => rx_re_in,

      rx_erroneous_out     => rx_erroneous_out,

      source_addr_out      => source_addr_out,

      source_port_out      => source_port_out,

      dest_port_out        => dest_port_out,

      rx_len_out           => rx_len_out,

      no_arp_target_MAC_in => no_arp_target_MAC_in,

      tx_data_out          => tx_data,

      tx_data_valid_out    => tx_data_valid,

      tx_re_in             => tx_re,

      target_MAC_out       => target_MAC,

      new_tx_out           => new_tx,

      tx_len_out           => tx_len,

      tx_frame_type_out    => tx_frame_type,

      rx_data_in           => rx_data,

      rx_data_valid_in     => rx_data_valid,

      rx_re_out            => rx_re,

      new_rx_in            => new_rx,

      rx_len_in            => rx_len,

      rx_frame_type_in     => rx_frame_type,

      rx_erroneous_in      => rx_erroneous,

      rx_error_out         => rx_error_out);

end structural;