Subject: Re: Summary of PSL Reserved Words and Operators
From: WallaceRiM@aol.com
Date: Tue Sep 09 2003 - 04:02:07 PDT
Steve,
Overloading of "&", "+", "*" for PSL.
Users of the language would have no problem using "+" or "*"
correctly. I do think that the "&" operator may be a problematic operator, not because
of the overloading but, due to the length matching semantics on cycles versus
the user's inclination to see it as an AND of resultant Booleans and not
sequences. This observation echoes your own below with a different focus on how
the operator may be confused by the user.
Cheers,
Richard
In a message dated 9/8/2003 3:23:44 PM Mountain Daylight Time,
SBailey@model.com writes:
> Subj: RE: Summary of PSL Reserved Words and Operators
> Date: 9/8/2003 3:23:44 PM Mountain Daylight Time
> From: <A HREF="mailto:SBailey@model.com">SBailey@model.com</A>
> To: <A HREF="mailto:vhdl-200x-asr@eda.org">vhdl-200x-asr@eda.org</A>
> Thanks Richard for your comments. They provide additional information for
> my initial tables.
>
> In reviewing Richard's comments, I find that I need to clarify some of the
> original comments I had made. Specifically, the comments about
> consistency/confusion in the use of &, + and * operators between traditional VHDL meaning
> and the new meanings added in a PSL context. My concern with these operators
> are related to the potential confusion in the user's mind and not in the
> ability to unambiguously parse them. For the latter, I agree with Richard's
> comments that the parsing aspect should not be a difficult problem to solve.
> However, for the former, I remain concerned about the application of the same
> operator symbol to different contexts with the "&" operator being more
> problematic than "+" or "*" as the PSL meaning is not really analogous to the
> existing VHDL meaning.
>
> -Steve Bailey
>
> >> -----Original Message-----
>> From: owner-vhdl-200x-asr@eda.org [mailto:owner-vhdl-200x-asr@eda.org]On
>> Behalf Of WallaceRiM@aol.com
>> Sent: Sunday, September 07, 2003 10:03 AM
>> To: vhdl-200x-asr@eda.org
>> Subject: Re: Summary of PSL Reserved Words and Operators
>>
>>
>> Hi all,
>>
>> Here are my comments for the PSL reserved words and operators.
>>
>> Cheers,
>> Richard Wallace
>>
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