VHDL Issue Number:      0223
Classification:         Language Clarification
Language Version:       VHDL-87
Summary:                Allowable prefixes on an expanded name
Related Issues:         Superseded By IR 1057 (Andy Tsay)
Relevant LRM Sections:  6.2
Key Words and Phrases:  expanded names, entity, architecture
Current Status:         Submitted
1076-1993 Disposition:  Superseded (ISAC Issues Outstanding)
Disposition Rationale:  
Superseded By:          1057
-----------------------
Date Submitted:         1991/03/21
Author of Submission:   Laurence Groves
Author's Affiliation:   Synopsys Inc.
Author's Post Address:  1098 Alta Ave.
                        Mountain View, CA 94043
Author's Phone Number:  (415) 962-5426
Author's Fax Number:    
Author's Net Address:   larry@Synopsys.COM
-----------------------
Date Analyzed:          TBD
Author of Analysis:     TBD
Revision Number:        $Revision: 1.10 $
Date Last Revised:      $Date: 1995/05/13 19:34:42 $


Description of Problem
----------------------
Consider the following:

        entity E is
            constant P : INTEGER := 1;
        end;

        architecture A of E is
           signal S : INTEGER;
        begin
           s <= E.P + A.P;
        end;

In the above code fragment, the expanded names E.P and A.P denote the same
object.  LRM 6.3 paragraph 8 states:

        An expanded name denotes an entity declared immediately within a
        named construct if the prefix denotes a construct that is an entity,
        an architecture, [...]

So entity and architectures are both allowed as prefixes, however it is not
clear whether both are allowed to be used to denote the same object.

Question:  If there is no ambiguity, can both the entity and architecture
           names be used to denote the same object?


Proposed Resolution
-------------------
Allow either the entity or architecture name to be used as the prefix
to denote an object defined in the entity declaration.


VASG-ISAC Analysis & Rationale
------------------------------
TBD


VASG-ISAC Recommendation for IEEE Std 1076-1987
-----------------------------------------------
TBD


VASG-ISAC Recommendation for Future Revisions
---------------------------------------------
TBD