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Attributes can be used to poll the characteristics of objects (e.g. signals). In many cases this allows a shorter and more elegant VHDL description to be created. The most important attributes are predefined ones.
In order to be able to use one`s own attributes one has to write a corresponding function which then provides the
attribute`s value at any given time. For further information go to: Attribute specification.
identifier ::=
basic_identifier | extended_identifier