[Fwd: from [David Bishop <dbishop@server.vhdl.org>]]

Subject: [Fwd: from [David Bishop ]]
From: Peter Ashenden (peter@ashenden.com.au)
Date: Wed Dec 11 2002 - 13:59:37 PST

-----Forwarded Message-----

Date: Sat, 07 Dec 2002 10:06:08 -0500
From: David Bishop <dbishop@server.vhdl.org>
To: Jim Lewis <jim@synthworks.com>
CC: Std_Logic 1164 <vhdl-std-logic@server.eda.org>,
   "Numeric_Std 1076.3" <vhdlsynth@server.eda.org>
Subject: Re: std_logic_1164: CP-010 and numeric_std:Rob_P1
References: <3DF15D9F.5050804@SynthWorks.com>
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Jim Lewis wrote:
>
> CP-010 Analyzed Add match functions like numeric_std.std_match
> http://www.eda.org/vhdl-std-logic/proposals/CP-010-match-functions.txt

If a command called "match" is added to "std_logic_1164" then
we should add one to "numeric_std" for "unsigned" and "signed".

Thus I propose:
  function MATCH (L, R: UNSIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: terms compared per STD_LOGIC_1164 intent

  function MATCH (L, R: SIGNED) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: terms compared per STD_LOGIC_1164 intent

These should simply call the "std_match" function which we
already have.

> In numeric_std, it was proposed in proposal Rob_P1/P2
> (http://www.eda.org/vhdlsynth/pilot/hm/0026.html), that
> the std_match functions for std_ulogic, std_logic_vector, and
> std_ulogic_vector be moved to std_logic_1164.

As already stated, we can't remove them. That would make lots
of code obsolete. But we can create new ones.

We have to consider the possibility of that the new "numeric_std"
package and the new "std_logic_1164" packages will not be released
at the same time.

> This would satisify CP-010 and Rob_P2. Is this a move that
> everyone would support? Otherwise, CP-010 proposes adding a match
> function to std_logic_1164. This means that we should add a
> match function to numeric_std. There is more meaning to a
> function when it is globally used.

I agree as stated above. 

-- 
NAME:     David W. Bishop           INTERNET: dbishop@vhdl.org

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