CONSTANT
cte : integer := 5 ;
CONSTANT
Vdd, Vcc : bit := '1' ;
CONSTANT
minimum_setup_time :
time := 5 ns ;
|
The constant
cte
is of the type integer and has the
value 5. The constants
Vdd
and
Vcc
are of the type
bit
and have the value '1'. The constant
minimum_setup-
_time
is of the physical type
time
and has the value 5 ns.
|
CONSTANT
name : string := "Dupond" ;
CONSTANT
address : bit_vector := "00110110" ;
CONSTANT
mask : bit_vector( 1
TO
3 ) := "0101" ;
CONSTANT
bittab : bit_vector( 1
TO
9 ) :=
( 1
TO
3 => '0', 7 | 9 => 'Z',
OTHERS
=> '1' ) ;
CONSTANT
tab : table_type( 0
TO
4 ) :=
( 2, 3, 4, -2, 0 ) ;
|
The constant
name
contains the string "
Dupond
".
The bit vector
address
has the constant value "00110110".
The constant
mask
is declared as a subtype of
bit_vector
with the value "0101".
The constant
bittab
is declared as a subtype of
bit_vector
with the value "000111Z1Z".
The constant
tab
is declared as a subtype of
table_type
with the individual elements being assigned
the constant values 2, 3, 4, -2 and 0.
|
PACKAGE
P
IS
CONSTANT
deferred : integer ;
END
P;
PACKAGE BODY
P
IS
CONSTANT
deferred : integer := 200 ;
END
P ;
|
An incomplete declaration of a constant, such as that
of
deferred
shown here, may only be contained in the
package declaration. The complete declaration of the
constant has to be contained in the package body.
If the constant`s value is changed only the
PACKAGE BODY
has to be newly translated and
none of the design units which are constructed upon the
package are affected.
|