RE: [sv-ac] RE: Mantis items 2551 and 2552

I agree with Dana's points. These restrictions should be in Clause 16.
I also agree that this can be done as a separate mantis.

J.H.

From: owner-sv-ac@eda.org [mailto:owner-sv-ac@eda.org] On Behalf Of Dana
Fisman
Sent: Wednesday, June 30, 2010 10:57 PM
To: Korchemny, Dmitry
Cc: sv-ac@eda.org
Subject: [sv-ac] RE: Mantis items 2551 and 2552

Hi Dmitry,

The changes themselves look fine to me.

I have two concerns about the nexttime etc. operators (2552), though.

The parameter in brackets is designated as constant_expression. Tracking
it on Annex A (via constant_expression, constant_primary,
primary_literal, number) I can see it can in particular be a negative
number or a real number. These do not make sense. The parameter should
be a non-negative integer (or an expression evaluated as such).

The same comment goes to cycle_delay_const_range_expression used in
always which is defined using constant_expression.

Another comment is about the verbal explanations of the operators. They
are correct when there is a single clock, but incorrect in the presence
of multiple clocks. In the presence of multiple clocks, a formula can be
evaluated at a cycle which is not a tick of the clock of the nexttime
operator. In such a case, the semantics dictates, that nexttime will
take you to the second tick of the clock of the nexttime operator. (It
is nexttime[0] that will take you to the first tick).

Regards,

Dana

From: owner-sv-ac@eda.org [mailto:owner-sv-ac@eda.org] On Behalf Of
Korchemny, Dmitry
Sent: Tuesday, June 29, 2010 12:47 PM
To: sv-ac@eda.org
Subject: [sv-ac] Mantis items 2551 and 2552

Hi all,

I uploaded proposals for the following Mantis items

2551: trivial example error

http://www.eda-stds.org/mantis/file_download.php?file_id=4338&type=bug

2552: Confusing comments regarding nexttime operator

http://www.eda-stds.org/mantis/file_download.php?file_id=4345&type=bug

Please, review.

Thanks,

Dmitry

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