(r5) RemoveConfigurationLibraryRequirement < P1076

P1076 Web>Vhdl2019CollectedRequirements>RemoveConfigurationLibraryRequirement (revision 5) (raw view)~~EditAttach~~

---+ Relax Library Requirement on Configurations

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---++ Proposal Details
   * Who Updates:Main.CliffordWalinsky
   * Date Proposed:2013-11-06
   * Date Last Updated:2013-11-06
   * Bugzilla Reference: 295

---+++ Current Situation

The 1076-2008 LRM, section 3.4 "Configuration declarations", states the following:

"For a configuration of a given design entity, both the configuration declaration and the corresponding entity declaration shall reside in the same library."

[[https://bugzilla.mentor.com/show_bug.cgi?id=295][See Bugzilla 295]]
---+++ Requirement

This proposal would remove the requirement that every configuration shall reside in the same library as the entity that it configures.
---+++ Implementation details

Allow configurations and their associated entities to reside within different libraries. This issue has been prototyped in a vendor's simulator and used in production environments without any issue.
---+++ Code Examples

Assuming entity top1 resides within (logical) library lib1, the following configuration declaration can be compiled to reside outside library lib1:
<verbatim>library lib1;
library lib2;
configuration conf1 of lib1.top1 is
    for arch_top1
        for label1 : comp_bottom1
            use entity lib2.bottom1
        end for;
    end for;
end conf1;</verbatim>

---++ Arguments FOR

This proposal allows configurations to reside within libraries containing design units that achieve similar design goals. For example, if all design units of a library are high-level RTL, configurations specifying that components shall be instantiated with RTL designs will naturally reside in the same RTL library.
---++ Arguments AGAINST

---++ Supporters

Main.CliffordWalinsky

-- [[Main.BrentHahoe][Brent Hayhoe]] - 2013-12-06

_-- Main.JimLewis - 2014-12-04_

-- Main.PatrickLehmann - 2016-02-11

_Add your signature here to indicate your support for the proposal_

Topic revision: r1 - 2020-02-17 - 15:34:38 - TWikiGuest

P1076