DynamicRewiring < P1076/Ballots

P1076/Ballots Web>Vhdl2019CollectedRequirements>DynamicRewiring (2020-02-17, JimLewis) (raw view)EditAttach

---+ Dynamic Connectivity

<br />%TOC%

---++ Proposal Details
   * Who Updates: Main.KevinCameron
   * Date Proposed:
   * Date Last Updated:
   * Priority:
   * Complexity:
   * Focus:

---+++ Current Situation

HDLs currently only manage static system descriptions. Real world systems have moving parts and things that plug in and drop out.

A common failing in HDLs is to view instantiation with port-maps to be the only (right?) way to connect things. In real systems many cross-couplings occur as a system gets larger and more complicated.
---+++ Related Issues

[[http://www.eda-twiki.org/isac/IRs-VHDL-2002/IR2021.txt][ISAC IR 2021]] - Dynamic hardware construct
---+++ Requirement

Handle dynamic addition and removal of entities. Connections can be made to any port or signal (not marked _private_).
---+++ Implementation details

As per C++ allow "new" and "delete" for instances.

Since the communication between components is through signals there is no intrinsic problem in reconfiguring resolution/communication in a running system - i.e. you don't have the dangling pointer issue of regular programming languages.

Dynamic instantiation covers the issue dynamic rewiring.
---+++ Code Examples
---++ Use Cases

Modeling mobile systems where things come and go.
---++ Arguments FOR

Let's model the real world.
---++ Arguments AGAINST

?
---++ General Comments
---++ Supporters

_Add your signature here to indicate your support for the proposal_

Topic revision: r5 - 2020-02-17 - 15:34:52 - JimLewis

P1076/Ballots