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IEEE LANGUAGE REFERENCE MANUAL Std P 1076a -1999 2000/D3 Annex B 237 Copyright © 2000, IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change. Annex B Glossary (informative) This glossary contains brief, informal descriptions for a number of terms and phrases used to define this language. The complete, formal definition of each term or phrase is provided in the main body of the standard. For each entry, the relevant clause numbers in the text are given. Some descriptions refer to multiple clauses in which the single concept is discussed; for these, the clause number containing the definition of the concept is given in italics. Other descriptions contain multiple clause numbers when they refer to multiple concepts; for these, none of the clause numbers are italicized. B.1 abstract literal: A literal of the universal_real abstract type or the universal_integer abstract type. (§13.2, §13.4 ) B.2 access type: A type that provides access to an object of a given type. Access to such an object is achieved by an access value returned by an allocator; the access value is said to designate the object. ( §3 , §3.3 ) B.3 access mode: The mode in which a file object is opened, which can be either read-only or write-only . The access mode depends on the value supplied to the Open_Kind parameter. ( §3.4.1 , §14.3). B.4 access value: A value of an access type. This value is returned by an allocator and designates an object (which must be a variable) of a given type. A null access value designates no object. An access value can only designate an object created by an allocator; it cannot designate an object declared by an object declaration. ( §3 , §3.3) B.5 active driver: A driver that acquires a new value during a simulation cycle regardless of whether the new value is different from the previous value. (§12.6.2, §12.6.4) B.6 actual: An expression, a port, a signal, or a variable associated with a formal port, formal parameter, or formal generic. (§, §, §, §, §, §5.2.1, § ) B.7 aggregate: a) The kind of expression, denoting a value of a composite type. The value is specified by giving the value of each of the elements of the composite type. Either a positional association or a named association may must 1 be used to indicate which value is associated with which element. b) A kind of target of a variable assignment statement or signal assignment statement assigning a composite value. The target is then said to be in the form of an aggregate . (§7.3.1, §7.3.2. §7.3.4, §7.3.5, §7.5.2) B.8 alias: An alternate name for a named entity. (§4.3.3) 1. IR1000.4.7.
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IEEE Std P 1076a -1999 2000/D3 IEEE STANDARD VHDL 238 Annex B Copyright © 2000, IEEE. All rights reserved. This is an unapproved IEEE Standards Draft, subject to change B.9 allocator: An operation used to create anonymous, variable objects accessible by means of access values .
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