VHDL Issue Number:      0134
Classification:         Language Definition Problem
Language Version:       VHDL-87
Summary:                The restriction that subprogram association 
                        elements may not have input or output conversion 
                        functions for signal parameters means that conversion 
                        functions for signals can't be used in 
                        concurrent_procedure_call statements.  
Related Issues:         ?
Relevant LRM Sections:  4.3.3.2
Key Words and Phrases:  Conversion Functions, Concurrent Procedure Calls
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Superseded By:          N/A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
----------------------
   The restriction that subprogram association elements may not have input 
   or output conversion functions for signal parameters means that conversion 
   functions for signals can't be used in concurrent\_procedure\_call statements.  
   Further the utility of 
   conversion functions for variable parameters is marginal at best: these 
   could always be simulated by an assignment before the procedure call, followed 
   by an assignment after the procedure call.  

Proposed Resolution
-------------------
   We propose that all conversion functions on subprogram parameters be
   disallowed, as a simplification to the language.

VASG-ISAC Analysis & Rationale
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VASG-ISAC Recommendation for IEEE Std 1076-1987
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VASG-ISAC Recommendation for Future Revisions
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