VHDL Issue Number:      1029
Classification          Language Definition Problem
Summary:                What should happen when there is a port clause
                        in a block statement but no port map clause?
Related Issues:         Supersedes 0141
Relevant LRM Sections:  9.1, 12.2
Key Words and Phrases:  Generic map clause, port map clause
Current Status:         Analyzed
-----------------------
Date Submitted:         1989/06/21
Author of Submission:   Ken Scott
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:          1994/07/25
Author of Analysis:     John Willis
Revision Number:        $Revision: 1.4 $
Date Last Revised:      $Date: 1995/07/25 19:11:02 $


Description of Problem
----------------------
   The second paragraph of section 12.2.1 indicates explicitly
   what should happen in the absence of a generic map clause:

      The value of a generic constant is not defined until a subsequent
      generic map clause is evaluated, or in the absence of a generic
      map clause, until the default expression associated with the
      generic constant is evaluated to determine the value of the
      constant.

   There is no corresponding passage in section 12.2.3 for port
   maps.  The LRM does not explicitly state what happens in the
   absence of an explicit port map clause.

Proposed Resolution
-------------------
   Section 12.2.3 should be updated with a description of what to
   do when a port map clause is absent.

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

  This problem seems to be adequately addressed in the context of
  specific ports which lack a corresponding association element.
  
  It does however seem reasonable to broaden treatment of the third
  paragraph is Section 12.2.4 to include both ports of mode "in",
  as it does now, and ports of mode "inout".


VASG-ISAC Recommendation for IEEE Std 1076-1993
-----------------------------------------------

  The third paragraph of Section 12.2.4 should apply to ports of
  both "in" mode and "inout" mode.


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

  The third paragraph of Section 12.2.4 should apply to ports of
  both "in" mode and "inout" mode.