entity ch_05_08 is

end entity ch_05_08;


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


architecture test of ch_05_08 is

  constant T_pd : delay_length := 5 ns;

  signal a, b : bit := '0';
  signal test_inputs : bit_vector(1 to 2);

  use work.stimulus_generators.all_possible_values;

begin


  block_05_3_f : block is

    signal sum, carry : bit;

  begin

    -- code from book:

    half_add : process is
    begin
      sum <= a xor b after T_pd;
      carry <= a and b after T_pd;
      wait on a, b;
    end process half_add;

    -- end of code from book

  end block block_05_3_f;


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


  block_05_3_g : block is

    signal sum, carry : bit;

  begin

    -- code from book:

    half_add : process (a, b) is
    begin
      sum <= a xor b after T_pd;
      carry <= a and b after T_pd;
    end process half_add;

    -- end of code from book

  end block block_05_3_g;


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


  stimulus_05_3_f_g :
    all_possible_values(test_inputs, 20 ns);

  (a, b) <= test_inputs;


end architecture test;