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-- Company: 

-- Engineer:

--

-- Create Date:   12:35:50 05/31/2011

-- Design Name:   

-- Module Name:   C:/Users/pjf/Documents/projects/fpga/xilinx/Network/arp1/arp_tb.vhd

-- Project Name:  arp1

-- Target Device:  

-- Tool versions:  

-- Description:   

-- 

-- VHDL Test Bench Created by ISE for module: arp

-- 

-- Dependencies:

-- 

-- Revision:

-- Revision 0.01 - File Created

-- Revision 0.02 - Added tests for ARP timeout

-- Additional Comments:

--

-- Notes: 

-- This testbench has been automatically generated using types std_logic and

-- std_logic_vector for the ports of the unit under test.  Xilinx recommends

-- that these types always be used for the top-level I/O of a design in order

-- to guarantee that the testbench will bind correctly to the post-implementation 

-- simulation model.

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

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.arp_types.all;

entity arpv2_tb is

end arpv2_tb;

architecture behavior of arpv2_tb is

  -- Component Declaration for the Unit Under Test (UUT)

  component arpv2

    generic (

      no_default_gateway : boolean := true;

      CLOCK_FREQ      : integer := 125000000;  -- freq of data_in_clk -- needed to timout cntr

      ARP_TIMEOUT     : integer := 60;  -- ARP response timeout (s)

      MAX_ARP_ENTRIES : integer := 255  -- max entries in the arp store

      );

    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);

      nwk_gateway     : in  std_logic_vector (31 downto 0);  -- IP address of default gateway

      nwk_mask        : in  std_logic_vector (31 downto 0);  -- Net mask

      control         : in  arp_control_type;

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

      );

  end component;

  --Inputs

  signal clk             : std_logic                     := '0';

  signal reset           : std_logic                     := '0';

  signal data_in         : std_logic_vector(7 downto 0)  := (others => '0');

  signal data_in_valid   : std_logic                     := '0';

  signal data_in_last    : std_logic                     := '0';

  signal our_mac_address : std_logic_vector(47 downto 0) := (others => '0');

  signal our_ip_address  : std_logic_vector(31 downto 0) := (others => '0');

  signal nwk_gateway     : std_logic_vector(31 downto 0) := (others => '0');

  signal nwk_mask        : std_logic_vector(31 downto 0) := (others => '0');

  signal data_out_ready  : std_logic;

  signal data_out_valid  : std_logic;

  signal data_out_first  : std_logic;

  signal data_out_last   : std_logic;

  signal data_out        : std_logic_vector (7 downto 0);

  signal req_count       : std_logic_vector(7 downto 0);

  signal arp_req_req     : arp_req_req_type;

  signal arp_req_rslt    : arp_req_rslt_type;

  signal mac_tx_req      : std_logic;

  signal mac_tx_granted  : std_logic;

  signal control         : arp_control_type;

  constant no_default_gateway : boolean := false;

  -- Clock period definitions

  constant clk_period : time := 8 ns;

begin

  -- Instantiate the Unit Under Test (UUT)

  uut : arpv2

    generic map (

      no_default_gateway => no_default_gateway,

      CLOCK_FREQ  => 10,                -- artificially low count to enable pragmatic testing

      ARP_TIMEOUT => 20

      )

    port map (

      -- lookup request mappings

      arp_req_req     => arp_req_req,

      arp_req_rslt    => arp_req_rslt,

      -- rx mappings

      data_in_clk     => clk,

      reset           => reset,

      data_in         => data_in,

      data_in_valid   => data_in_valid,

      data_in_last    => data_in_last,

      -- tx mappings

      mac_tx_req      => mac_tx_req,

      mac_tx_granted  => mac_tx_granted,

      data_out_clk    => clk,

      data_out_ready  => data_out_ready,

      data_out_valid  => data_out_valid,

      data_out_first  => data_out_first,

      data_out_last   => data_out_last,

      data_out        => data_out,

      -- system mappings

      our_mac_address => our_mac_address,

      our_ip_address  => our_ip_address,

      nwk_gateway     => nwk_gateway,

      nwk_mask        => nwk_mask,

      control         => control,

      req_count       => req_count

      );

  -- Clock process definitions

  clk_process : process

  begin

    clk <= '0';

    wait for clk_period/2;

    clk <= '1';

    wait for clk_period/2;

  end process;

  -- Stimulus process

  stim_proc : process

  begin

    -- hold reset state for 100 ns.

    wait for 100 ns;

    our_ip_address      <= x"c0a80509";  -- 192.168.5.9

    nwk_mask            <= x"FFFFFF00";

    nwk_gateway         <= x"c0a80501";  -- 192.168.5.9

    our_mac_address     <= x"002320212223";

    mac_tx_granted      <= '1';          -- FIXME 0

    control.clear_cache <= '0';

    reset <= '1';

    wait for clk_period*10;

    reset <= '0';

    wait for clk_period*5;

    assert mac_tx_req = '0' report "mac_tx_req asserted on reset";

    wait until clk = '1';

    -- insert stimulus here

    arp_req_req.lookup_req <= '0';

    arp_req_req.ip         <= (others => '0');

    data_out_ready         <= '1';

    report "T1:  Send an ARP request: who has 192.168.5.9? Tell 192.168.5.1";

    data_in_valid <= '1';

    -- dst MAC (bc)

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    -- src MAC

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"23"; wait for clk_period;

    data_in       <= x"18"; wait for clk_period;

    data_in       <= x"29"; wait for clk_period;

    data_in       <= x"26"; wait for clk_period;

    data_in       <= x"7c"; wait for clk_period;

    -- type

    data_in       <= x"08"; wait for clk_period;

    data_in       <= x"06"; wait for clk_period;

    -- HW type

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"01"; wait for clk_period;

    -- Protocol type

    data_in       <= x"08"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    -- HW size

    data_in       <= x"06"; wait for clk_period;

    -- protocol size

    data_in       <= x"04"; wait for clk_period;

    -- Opcode

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"01"; wait for clk_period;

    -- Sender MAC

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"23"; wait for clk_period;

    data_in       <= x"18"; wait for clk_period;

    data_in       <= x"29"; wait for clk_period;

    data_in       <= x"26"; wait for clk_period;

    data_in       <= x"7c"; wait for clk_period;

    -- Sender IP

    data_in       <= x"c0"; wait for clk_period;

    data_in       <= x"a8"; wait for clk_period;

    data_in       <= x"05"; wait for clk_period;

    data_in       <= x"01"; wait for clk_period;

    -- Target MAC

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    -- Target IP

    data_in       <= x"c0"; wait for clk_period;

    data_in       <= x"a8"; wait for clk_period;

    data_in       <= x"05"; wait for clk_period;

    data_in       <= x"09"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in_last  <= '1';

    data_in       <= x"00"; wait for clk_period;

    data_in_last  <= '0';

    data_in_valid <= '0';

    report "T1:  Expect that we send an 'I have 192.168.5.9' msg";

    -- check tx arbitration signals

    report "T1: waiting for tx req";

    wait until mac_tx_req = '1';

    -- ready to tx

    data_out_ready <= '1';

    mac_tx_granted <= '1';

    report "T1: waiting for data_out_valid";

    wait until data_out_valid = '1';

    report "T1: got data_out_valid";

    wait for clk_period*10;

    data_out_ready <= '0';

    wait for clk_period*2;

    data_out_ready <= '1';

    wait for clk_period*12;

    assert data_out = x"02" report "T1: expected opcode = 02 for reply 'I have'";

    -- expect our mac 00 23 20 21 22 23

    wait for clk_period;

    assert data_out = x"00" report "T1: incorrect our mac.0";

    wait for clk_period;

    assert data_out = x"23" report "T1: incorrect our mac.1";

    wait for clk_period;

    assert data_out = x"20" report "T1: incorrect our mac.2";

    wait for clk_period;

    assert data_out = x"21" report "T1: incorrect our mac.3";

    wait for clk_period;

    assert data_out = x"22" report "T1: incorrect our mac.4";

    wait for clk_period;

    assert data_out = x"23" report "T1: incorrect our mac.5";

    -- expect our IP c0 a8 05 05

    wait for clk_period;

    assert data_out = x"c0" report "T1: incorrect our IP.0";

    wait for clk_period;

    assert data_out = x"a8" report "T1: incorrect our IP.1";

    wait for clk_period;

    assert data_out = x"05" report "T1: incorrect our IP.2";

    wait for clk_period;

    assert data_out = x"09" report "T1: incorrect our IP.3";

    -- expect target mac 00 23 18 29 26 7c

    wait for clk_period;

    assert data_out = x"00" report "T1: incorrect target mac.0";

    wait for clk_period;

    assert data_out = x"23" report "T1: incorrect target mac.1";

    wait for clk_period;

    assert data_out = x"18" report "T1: incorrect target mac.2";

    wait for clk_period;

    assert data_out = x"29" report "T1: incorrect target mac.3";

    wait for clk_period;

    assert data_out = x"26" report "T1: incorrect target mac.4";

    wait for clk_period;

    assert data_out = x"7c" report "T1: incorrect target mac.5";

    -- expect target IP c0 a8 05 01

    wait for clk_period;

    assert data_out = x"c0" report "T1: incorrect target IP.0";

    wait for clk_period;

    assert data_out = x"a8" report "T1: incorrect target IP.1";

    wait for clk_period;

    assert data_out = x"05" report "T1: incorrect target IP.2";

    assert data_out_last = '0' report "T1: data out last incorrectly set on target IP.2 byte";

    wait for clk_period;

    assert data_out = x"01" report "T1: incorrect target IP.3";

    assert data_out_last = '1' report "T1: data out last should be set";

    wait for clk_period*10;

    report "T2: Send another ARP request: who has 192.168.5.8? Tell 192.168.5.1, holding off transmitter";

    data_out_ready <= '0';

    data_in_valid  <= '1';

    -- dst MAC (bc)

    data_in        <= x"ff"; wait for clk_period;

    data_in        <= x"ff"; wait for clk_period;

    data_in        <= x"ff"; wait for clk_period;

    data_in        <= x"ff"; wait for clk_period;

    data_in        <= x"ff"; wait for clk_period;

    data_in        <= x"ff"; wait for clk_period;

    -- src MAC

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"23"; wait for clk_period;

    data_in        <= x"18"; wait for clk_period;

    data_in        <= x"29"; wait for clk_period;

    data_in        <= x"26"; wait for clk_period;

    data_in        <= x"7c"; wait for clk_period;

    -- type

    data_in        <= x"08"; wait for clk_period;

    data_in        <= x"06"; wait for clk_period;

    -- HW type

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"01"; wait for clk_period;

    -- Protocol type

    data_in        <= x"08"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    -- HW size

    data_in        <= x"06"; wait for clk_period;

    -- protocol size

    data_in        <= x"04"; wait for clk_period;

    -- Opcode

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"01"; wait for clk_period;

    -- Sender MAC

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"23"; wait for clk_period;

    data_in        <= x"18"; wait for clk_period;

    data_in        <= x"29"; wait for clk_period;

    data_in        <= x"26"; wait for clk_period;

    data_in        <= x"7c"; wait for clk_period;

    -- Sender IP

    data_in        <= x"c0"; wait for clk_period;

    data_in        <= x"a8"; wait for clk_period;

    data_in        <= x"05"; wait for clk_period;

    data_in        <= x"01"; wait for clk_period;

    -- Target MAC

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    -- Target IP

    data_in        <= x"c0"; wait for clk_period;

    data_in        <= x"a8"; wait for clk_period;

    data_in        <= x"05"; wait for clk_period;

    data_in        <= x"09"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in        <= x"00"; wait for clk_period;

    data_in_last   <= '1';

    data_in        <= x"00"; wait for clk_period;

    data_in_last   <= '0';

    data_in_valid  <= '0';

    -- ready to tx

    wait for clk_period*10;

    data_out_ready <= '1';

    wait for clk_period*50;

    report "T3: Send a request for the IP that is already in the store";

    arp_req_req.ip         <= x"c0a80501";

    arp_req_req.lookup_req <= '1';

    wait for clk_period;

    arp_req_req.lookup_req <= '0';

    report "T3: wait for reply from store";

    wait until arp_req_rslt.got_mac = '1' or arp_req_rslt.got_err = '1';

    assert arp_req_rslt.got_mac = '1' report "T3: expected got mac";

    assert arp_req_rslt.got_err = '0' report "T3: expected got err = 0";

    assert arp_req_rslt.mac = x"00231829267c" report "T3: wrong mac value";

    wait for clk_period*2;

    -- the entry that was in the store should now be in the cache - check it

    report "T4: Send a request for the IP that is already in the cache";

    arp_req_req.ip         <= x"c0a80501";

    arp_req_req.lookup_req <= '1';

    wait for clk_period;

    arp_req_req.lookup_req <= '0';

    assert arp_req_rslt.got_mac = '1' report "T4: expected got mac";

    assert arp_req_rslt.got_err = '0' report "T4: expected got err = 0";

    assert arp_req_rslt.mac = x"00231829267c" report "T4: wrong mac value";

    wait for clk_period*50;

    report "T5 - Send a request for the IP that is not cached or in the store";

    arp_req_req.ip         <= x"c0a80503";

    arp_req_req.lookup_req <= '1';

    wait for clk_period;

    arp_req_req.lookup_req <= '0';

    report "T5: waiting for data_out_valid";

    wait until data_out_valid = '1';

    report "T5: got data_out_valid";

    wait for clk_period*10;

    data_out_ready         <= '0';

    wait for clk_period*2;

    data_out_ready         <= '1';

    wait for clk_period*12;

    assert data_out = x"01" report "T5: expected opcode = 01 for request 'who has'";

    -- expect our mac 00 23 20 21 22 23

    wait for clk_period;

    assert data_out = x"00" report "T5: incorrect our mac.0";

    wait for clk_period;

    assert data_out = x"23" report "T5: incorrect our mac.1";

    wait for clk_period;

    assert data_out = x"20" report "T5: incorrect our mac.2";

    wait for clk_period;

    assert data_out = x"21" report "T5: incorrect our mac.3";

    wait for clk_period;

    assert data_out = x"22" report "T5: incorrect our mac.4";

    wait for clk_period;

    assert data_out = x"23" report "T5: incorrect our mac.5";

    -- expect our IP c0 a8 05 05

    wait for clk_period;

    assert data_out = x"c0" report "T5: incorrect our IP.0";

    wait for clk_period;

    assert data_out = x"a8" report "T5: incorrect our IP.1";

    wait for clk_period;

    assert data_out = x"05" report "T5: incorrect our IP.2";

    wait for clk_period;

    assert data_out = x"09" report "T5: incorrect our IP.3";

    -- expect empty target mac 

    wait for clk_period;

    assert data_out = x"ff" report "T5: incorrect target mac.0";

    wait for clk_period;

    assert data_out = x"ff" report "T5: incorrect target mac.1";

    wait for clk_period;

    assert data_out = x"ff" report "T5: incorrect target mac.2";

    wait for clk_period;

    assert data_out = x"ff" report "T5: incorrect target mac.3";

    wait for clk_period;

    assert data_out = x"ff" report "T5: incorrect target mac.4";

    wait for clk_period;

    assert data_out = x"ff" report "T5: incorrect target mac.5";

    -- expect target IP c0 a8 05 01

    wait for clk_period;

    assert data_out = x"c0" report "T5: incorrect target IP.0";

    wait for clk_period;

    assert data_out = x"a8" report "T5: incorrect target IP.1";

    wait for clk_period;

    assert data_out = x"05" report "T5: incorrect target IP.2";

    assert data_out_last = '0' report "T5: data out last incorrectly set on target IP.2 byte";

    wait for clk_period;

    assert data_out = x"03" report "T5: incorrect target IP.3";

    assert data_out_last = '1' report "T5: data out last should be set";

    wait for clk_period*10;

    -- Send the reply

    data_out_ready <= '1';

    report "T5.2: Send an ARP reply: 192.168.5.3 has mac 02:12:03:23:04:54";

    data_in_valid <= '1';

    -- dst MAC (bc)

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    data_in       <= x"ff"; wait for clk_period;

    -- src MAC

    data_in       <= x"02"; wait for clk_period;

    data_in       <= x"12"; wait for clk_period;

    data_in       <= x"03"; wait for clk_period;

    data_in       <= x"23"; wait for clk_period;

    data_in       <= x"04"; wait for clk_period;

    data_in       <= x"54"; wait for clk_period;

    -- type

    data_in       <= x"08"; wait for clk_period;

    data_in       <= x"06"; wait for clk_period;

    -- HW type

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"01"; wait for clk_period;

    -- Protocol type

    data_in       <= x"08"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    -- HW size

    data_in       <= x"06"; wait for clk_period;

    -- protocol size

    data_in       <= x"04"; wait for clk_period;

    -- Opcode

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"02"; wait for clk_period;

    -- Sender MAC

    data_in       <= x"02"; wait for clk_period;

    data_in       <= x"12"; wait for clk_period;

    data_in       <= x"03"; wait for clk_period;

    data_in       <= x"23"; wait for clk_period;

    data_in       <= x"04"; wait for clk_period;

    data_in       <= x"54"; wait for clk_period;

    -- Sender IP

    data_in       <= x"c0"; wait for clk_period;

    data_in       <= x"a8"; wait for clk_period;

    data_in       <= x"05"; wait for clk_period;

    data_in       <= x"03"; wait for clk_period;

    -- Target MAC

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"23"; wait for clk_period;

    data_in       <= x"20"; wait for clk_period;

    data_in       <= x"21"; wait for clk_period;

    data_in       <= x"22"; wait for clk_period;

    data_in       <= x"23"; wait for clk_period;

    -- Target IP

    data_in       <= x"c0"; wait for clk_period;

    data_in       <= x"a8"; wait for clk_period;

    data_in       <= x"05"; wait for clk_period;

    data_in       <= x"09"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    data_in       <= x"00"; wait for clk_period;

    assert arp_req_rslt.got_mac = '1' report "T5.2: expected got mac";

    assert arp_req_rslt.got_err = '0' report "T5.2: expected got err = 0";

    assert arp_req_rslt.mac = x"021203230454" report "T5.2: wrong mac value";

    data_in       <= x"00"; wait for clk_period;

    data_in_last  <= '1';

    data_in       <= x"00"; wait for clk_period;

    data_in_last  <= '0';

    data_in_valid <= '0';

    wait for clk_period*4;

    report "T6: check that both these IPs remain in the store";

    arp_req_req.ip         <= x"c0a80501";

    arp_req_req.lookup_req <= '1';

    wait for clk_period;

    arp_req_req.lookup_req <= '0';

    wait for clk_period;

    report "T6.1: wait for reply from store";

    wait until arp_req_rslt.got_mac = '1' or arp_req_rslt.got_err = '1';

    assert arp_req_rslt.got_mac = '1' report "T6.1: expected got mac";

    assert arp_req_rslt.got_err = '0' report "T6.1: expected got err = 0";

    assert arp_req_rslt.mac = x"00231829267c" report "T6.1: wrong mac value";

    wait for clk_period*2;

    arp_req_req.ip         <= x"c0a80503";

    arp_req_req.lookup_req <= '1';

    wait for clk_period;

    arp_req_req.lookup_req <= '0';

    wait for clk_period;

    report "T6.2: wait for reply from store";

    wait until arp_req_rslt.got_mac = '1' or arp_req_rslt.got_err = '1';

    assert arp_req_rslt.got_mac = '1' report "T6.2: expected got mac";

    assert arp_req_rslt.got_err = '0' report "T6.2: expected got err = 0";

    assert arp_req_rslt.mac = x"021203230454" report "T6.2: wrong mac value";

    wait for clk_period*2;

    report "T7 - test that receipt of wrong I Have does not satisfy a current req";

    arp_req_req.ip         <= x"c0a8050e";

    arp_req_req.lookup_req <= '1';

    wait for clk_period;

    arp_req_req.lookup_req <= '0';

    report "T7: waiting for data_out_valid";

    wait until data_out_valid = '1';

    report "T7: got data_out_valid";

    wait for clk_period*10;

    data_out_ready         <= '0';

    wait for clk_period*2;

    data_out_ready         <= '1';

    wait for clk_period*12;

    assert data_out = x"01" report "T7: expected opcode = 01 for request 'who has'";

    -- expect our mac 00 23 20 21 22 23

    wait for clk_period;

    assert data_out = x"00" report "T7: incorrect our mac.0";

    wait for clk_period;

    assert data_out = x"23" report "T7: incorrect our mac.1";

    wait for clk_period;

    assert data_out = x"20" report "T7: incorrect our mac.2";

    wait for clk_period;

    assert data_out = x"21" report "T7: incorrect our mac.3";

    wait for clk_period;

    assert data_out = x"22" report "T7: incorrect our mac.4";

    wait for clk_period;

    assert data_out = x"23" report "T7: incorrect our mac.5";

    -- expect our IP c0 a8 05 05

    wait for clk_period;

    assert data_out = x"c0" report "T7: incorrect our IP.0";

    wait for clk_period;

    assert data_out = x"a8" report "T7: incorrect our IP.1";

    wait for clk_period;

    assert data_out = x"05" report "T7: incorrect our IP.2";

    wait for clk_period;

    assert data_out = x"09" report "T7: incorrect our IP.3";

    -- expect empty target mac

    wait for clk_period;

    assert data_out = x"ff" report "T7: incorrect target mac.0";