VHDL Issue Number:      0072
Classification:         Language Definition Problem
Language Version:       VHDL-87
Summary:                Reference to a generate loop parameter in a
                        configuration is unclear.
Related Issues:         0027, 0029, 0112
Relevant LRM Sections:  9.7, 1.3
Key Words and Phrases:  Generate loop parameter, configuration declaration
Current Status:         Submitted
1076-1993 Disposition:  Superseded (ISAC Issues Outstanding)
Disposition Rationale:  N/A
Superseded By:          1013
-----------------------
Date Submitted:         1989/02/10
Author of Submission:   Doug Dunlop
Author's Affiliation:   Intermetrics, Inc.
Author's Post Address:  4733 Bethesda Ave #415
                        Bethesda, MD  20814
Author's Phone Number:  (301) 657-3775
Author's Fax Number:    
Author's Net Address:   dunlop@inmet.inmet.com
-----------------------
Date Analyzed:          TBD
Author of Analysis:     TBD
Revision Number:        $Revision: 1.10 $
Date Last Revised:      $Date: 1995/05/13 21:53:48 $


Description of Problem
----------------------
References to generate loop parameters from within a
configuration are not defined.  As an example, consider

   architecture arch of e is
   begin
      b: for i in 1 to 10 generate
            ... 
         end generate;
   end arch;

   configuration c of e is
      for arch
         for b(i) ... end for;
      end for;
   end c;

Is the configuration valid?  If so, what does it mean?  The problem
specifically is that the point in the elaboration process at which "b(i)" gets
evaluated is not specified.


Proposed Resolution
-------------------
Rather than disallowing this, it seems to make more sense to say
that the corresponding block specification(s) are elaborated each time the
body of the generate statement is elaborated.  Hence the above
   for b(i) ...
is equivalent to
   for b ...
i.e., means "for all".


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


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


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