p1076_chap_04

The value of an interface object may be determined by

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Unformatted text preview: n interface object may be determined by the value of an associated object or expression in the environment; similarly, the value of an object in the environment may be determined by the value of an associated interface object. The manner in which such associations are made is described in 4.3.2.2. The value of an object is said to be read when one of the following conditions is satisfied: -- -- -- When the object is evaluated, and also (indirectly) when the object is associated with an interface object of the modes in, inout, or linkage. When the object is a signal and a name denoting the object appears in a sensitivity list in a wait statement or a process statement. When the object is a signal and the value of any of its predefined attributes 'STABLE, 'QUIET, 'DELAYED, 'TRANSACTION, 'EVENT, 'ACTIVE, 'LAST_EVENT, 'LAST_ACTIVE, or 'LAST_VALUE is read. When one of its subelements is read. When the object is a file and a READ operation is performed on the file. When the object is a file of type STD.TEXTIO.TEXT and...
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