SCL allows the definition of types which can then be subsequently used to define variables . There are several kinds of type definitions.

Enumerations

Enumeration type definitions give specific values that the type allows:

type color is (red, blue, green);

Ranges

Range definitions give a range of values that the type allows:

type Byte is range 0 to #16#FF#;

Range definitions can include an option definition of the units associated with the type:

type voltage is range -9223372036854775807 to 9223372036854775807   units mV;      V  = 1000 mV;      kV = 1000 V;   end units;

Arrays

Below is an example of an array type:

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

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