ATTRIBUTE: Definition

ENTITY attr_demo IS

  -- Typdeklarationen
  TYPE level IS (low, medium, high);
  TYPE state IS (instable, stable);
  TYPE res_type IS RANGE 0.0 TO 1.0E6;
  TYPE loc_type IS RECORD x_pos : integer; 
              y_pos : integer;
                   END RECORD;

  -- Attributdeklarationen
  ATTRIBUTE technology    : string;
  ATTRIBUTE priority      : level;
  ATTRIBUTE sig_state     : state;
  ATTRIBUTE resistance    : res_type;
  ATTRIBUTE location      : loc_type;

  -- Attributdefinition
  ATTRIBUTE technology OF attr_demo : ENTITY IS "ttl";


END attr_demo;



ARCHITECTURE demo OF attr_demo IS

  SIGNAL in_a, in_b, in_c : bit := '1';

  -- Attributdefinition
  ATTRIBUTE sig_state  OF in_a       : SIGNAL IS instable;   
  ATTRIBUTE sig_state  OF OTHERS     : SIGNAL IS stable;


BEGIN

  -- Attributanwendung
  ASSERT attr_demo'technology = "cmos" 
  REPORT "Kein CMOS-Modul"
  SEVERITY note;

END demo;