VHDL Issue Number:      0137
Classification:         Language Definition Problem
Language Version:       VHDL-87
Summary:                Configurations should be ternary units.
Related Issues:         
Relevant LRM Sections:  11.1
Key Words and Phrases:  Configurations, Primary Units
Current Status:         Submitted
1076-1993 Disposition:  Bugs Fixed, Enhancements Outstanding (No ISAC Issues)
Disposition Rationale:  Non-ISAC issues outstanding.
Superseded By:          N/A
-----------------------
Date Submitted:             1989/06/21
Author of Submission:   Rod Farrow
Author's Affiliation:   Vantage Analysis Systems, Inc.
Author's Post Address:  42840 Christy St., Suite 201
                        Fremont, CA   94538
Author's Phone Number:  (415) 659-0901
Author's Fax Number:    
Author's Net Address:   N/A
-----------------------
Date Analyzed:          TBD
Author of Analysis:     TBD
Revision Number:        $Revision: 1.9 $
Date Last Revised:      $Date: 1995/08/04 01:37:53 $


Description of Problem
----------------------
   Configurations should not be primary units.  It should be possible to
   specify a CMOS or TTL configuration for more than one entity in a
   particular library.  In addition, they should not be secondary units,
   in that it should be legal to specify a CMOS configuration for different
   architectures of a particular entity.

Proposed Resolution
-------------------
   Configurations should be ternary units, based on a specific entity and
   architecture.

   Making this change would require a modification to the entity aspect
   language production.  We would remove the 'configuration' option, and
   instead enhance the 'entity' option as follows:
      entity_aspect ::=
        entity entity_name[(architecture_identifier[(configuration_id)])]
      | open

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


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


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