p1076_chap_11 - LANGUAGE REFERENCE MANUAL IEEE Std...

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IEEE LANGUAGE REFERENCE MANUAL Std P 1076a -1999 2000/D3 Section Clause 11 161 Copyright © 2000, IEEE. All rights reserved. This is an unapproved IEEE Standards draft, subject to change. Section Clause 1 11 Design units and their analysis The overall organization of descriptions, as well as their analysis and subsequent definition in a design library, are discussed in this section clause 2 . 11.1 Design units Certain constructs may be are 3 independently analyzed and inserted into a design library; these constructs are called design units . One or more design units in sequence comprise a design file . design_file ::= design_unit { design_unit } design_unit ::= context_clause library_unit library_unit ::= primary_unit | secondary_unit primary_unit ::= entity_declaration | configuration_declaration | package_declaration secondary_unit ::= architecture_body | package_body Design units in a design file are analyzed in the textual order of their appearance in the design file. Analysis of a design unit defines the corresponding library unit in a design library. A library unit is either a primary unit or a secondary unit. A secondary unit is a separately analyzed body of a primary unit resulting from a previous anal- ysis. The name of a primary unit is given by the first identifier after the initial reserved word of that unit. Of the sec- ondary units, only architecture bodies are named; the name of an architecture body is given by the identifier fol- lowing the reserved word architecture . Each primary unit in a given library must have a simple name that is unique within the given library, and each architecture body associated with a given entity declaration must have a simple name that is unique within the set of names of the architecture bodies associated with that entity decla- ration. 1. To conform to IEEE rules. 2. To conform to IEEE rules.
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