Update std_logic_arith

Proposal Editing Information

• Who Updates: OPEN, JimLewis
• Date Proposed: 2012-08-17
• Date Last Updated: 2012-08-17
• Priority:
• Complexity:
• Focus: Testbench

Summary

Update std_logic_arith to simplify interfacing with numeric_std

Suggested during February 16, 2012

• First step, propose change to vendor owner.
• If that does not take, propose adoption by IEEE
• Propose that it is donated to IEEE or alternately propose that vendor makes a change

Related and/or Competing Issues: No

Proposal

Proposal Part 1: Alias types unsigned and signed to numeric_std

Purpose: Simplify interfacing between designs using std_logic_arith and numeric_std.

Change the definition of std_logic_arith.unsigned and std_logic_arith.signed to:

alias unsigned is numeric_std.unsigned ; 
alias signed is numeric_std.signed ;

Proposal Part 2: Alias all common subprograms

Pro: Simplify transition to numeric_std 
Con: Behavior is slightly different. 
       Particularly wrt warnings vs errors. 
       Probably too much.

Questions

General Comments

Why bother? Both of the packages have been around for 20+ years and they both work how they work. Part 2 of the proposal indicates that it will break existing code in certain situations. The benefit listed on this proposal is to "Simplify interfacing between designs using std_logic_arith and numeric_std" but no actual examples of such simplifications are provided. -- KevinJennings - 2014-12-08

Supporters

Add your signature here to indicate your support for the proposal

-- JimLewis - 2014-12-04