Subject: fullcase/parallel case (fwd)
From: Jayaram Bhasker (jbhasker@cadence.com)
Date: Wed Jul 11 2001 - 10:13:38 PDT
I am forwarding Joe's email.
David Bishop: Any reason why Joe's email to vlog-synth bounced?
- bhasker
------------- Begin Forwarded Message -------------
From: "Joseph P. Wetstein" <jpw@cbis.ece.drexel.edu>
Subject: fullcase/parallel case (fwd)
To: jbhasker
Date: Mon, 9 Jul 2001 13:30:00 -0400 (EDT)
CC: joseph wetstein <jpw@cbis.ece.drexel.edu>
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hi -
For some reason, my email to the group bounced... perhaps you can help...
Joe
----- Forwarded message from Joseph P. Wetstein -----
>From jpw Mon Jul 9 13:28:44 2001
From: "Joseph P. Wetstein" <jpw>
Message-Id: <200107091728.f69HSfn15471@coe.drexel.edu>
Subject: fullcase/parallel case
To: vlog-synth@eda.org
Date: Mon, 9 Jul 2001 13:28:41 -0400 (EDT)
CC: joseph wetstein <jpw@cbis.ece.drexel.edu>
Reply-To: j.wetstein@ieee.org
Organization: self-affiliated
X-Mailer: ELM [version 2.4ME+ PL60 (25)]
All,
There seem to be some big issues, as I'm sure most of you know by now,
with the differences in simulation and synthesis when using full case and
parallel case attributes in case-statement design.
While these attributes should be synthesizable, they are very dangerous.
The irony is that, especially in the 'case' of the parallel case (sorry
for the pun), it is most dangerous when it actually works correctly!
I will go into this in more depth if it is required by the group, but it
seems to me that the attributes should be allowed and should be
synthesizable, but there should be error checking performed by the tools
to determine if the statements are more deterimental than not.
Additionally a WARNING should be issued whenever they are present. At
least, when a default statement is used in conjunction with a full-case,
and the latter is then ignored, it seems that a warning should be
generated.
Do these provide some reasonable points for discussion?
-Joe
--
Joseph P. Wetstein, P.E.
j.wetstein@ieee.org
(707) 202-0600 fax
PP/ASEL & KA3VJY [Tech+]
----- End of forwarded message from Joseph P. Wetstein -----
-- Joseph P. Wetstein, P.E. j.wetstein@ieee.org (707) 202-0600 fax PP/ASEL & KA3VJY [Tech+]------------- End Forwarded Message -------------
J. Bhasker Cadence Design Systems 7535 Windsor Drive, Suite A200, Allentown, PA 18195 610.398.6312, 610.530.7985 (fax), jbhasker@cadence.com
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