entity ch_20_08 is

end entity ch_20_08;


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


library ieee;  use ieee.std_logic_1164.all;

architecture std_cell of ch_20_08 is

  attribute cell_name : string;
  attribute pin_number : positive;
  attribute max_wire_delay : delay_length;
  attribute encoding : bit_vector;

  type length is range 0 to integer'high
    units nm;
      um = 1000 nm;
      mm = 1000 um;
      mil = 25400 nm;
    end units length;

  type coordinate is record
      x, y : length;
    end record coordinate;

  attribute cell_position : coordinate;

  type built_in_type is (bv_incr, std_incr);
  attribute built_in : built_in_type;

  signal enable, clk : bit;

  type state_type is (idle_state, other_state);

  type speed_range is (high, other_speed);
  type coolant_level is (high, other_level);

  attribute representation : string;

  function increment ( vector : in bit_vector ) return bit_vector is
  begin
  end;

  function increment ( vector : in std_logic_vector ) return std_logic_vector is
  begin
  end;

  attribute cell_name of std_cell : architecture is "DFF_SR_QQNN";
  attribute pin_number of enable : signal is 14;
  attribute max_wire_delay of clk : signal is 50 ps;
  attribute encoding of idle_state : literal is b"0000";
  attribute cell_position of the_fpu : label is ( 540 um, 1200 um );
  attribute built_in of
    increment [ bit_vector return bit_vector ] : function is bv_incr;
  attribute built_in of
    increment [ std_logic_vector return std_logic_vector ] : function is std_incr;
  attribute representation of high [ return speed_range ] : literal is "byte";
  attribute representation of high [ return coolant_level ] : literal is "word";

begin

  the_fpu : block is
  begin
  end block the_fpu;

  process is
    variable v1 : string(1 to 11);
    variable v2 : positive;
    variable v3 : time;
    variable v4 : bit_vector(0 to 3);
    variable v5 : coordinate;
    variable v6, v7 : built_in_type;
    variable v8, v9 : string(1 to 4);
  begin

    -- code from book included...

    v1 := std_cell'cell_name ;
    v2 := enable'pin_number ;
    v3 := clk'max_wire_delay ;
    -- workaround MTI bugs mt037/mt038
    -- v4 := idle_state'encoding ;
    v4 := idle_state[return state_type]'encoding ;
    -- end workaround
    v5 := the_fpu'cell_position ;

    v6 := increment [ bit_vector return bit_vector ] 'built_in ;
    v7 := increment [ std_logic_vector return std_logic_vector ] 'built_in ;

    v8 := high [ return speed_range ] 'representation ;
    v9 := high [ return coolant_level ] 'representation ;

    -- end code from book

    wait;
  end process;

end architecture std_cell;