entity ch_04_06 is

end entity ch_04_06;


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


library ieee;  use ieee.std_logic_1164.std_ulogic;

architecture test of ch_04_06 is

  -- code from book:

  type std_ulogic_vector is array ( natural range <> ) of std_ulogic;
  
  --
  
  subtype std_ulogic_word is std_ulogic_vector(0 to 31);
  
  --
  
  signal csr_offset : std_ulogic_vector(2 downto 1);

  -- end of code from book

begin


  process_04_2_b : process is

    -- code from book:

    type string is array (positive range <>) of character;

    --

    constant LCD_display_len : positive := 20;
    subtype LCD_display_string is string(1 to LCD_display_len);
    variable LCD_display : LCD_display_string := (others => ' ');

    --

    type bit_vector is array (natural range <>) of bit;

    --

    subtype byte is bit_vector(7 downto 0);

    --

    variable channel_busy_register : bit_vector(1 to 4);

    --

    constant ready_message  : string := "Ready     ";

    --

    variable current_test : std_ulogic_vector(0 to 13) := "ZZZZZZZZZZ----";

    --

    constant all_ones : std_ulogic_vector(15 downto 0) := X"FFFF";

    -- end of code from book

  begin

    -- code from book:

    channel_busy_register := b"0000";

    -- end of code from book

    wait;
  end process process_04_2_b;


end architecture test;