From snk at gna.org  Mon Oct  8 16:55:26 2007
From: snk at gna.org (Suraj N. Kurapati)
Date: Mon, 8 Oct 2007 13:55:26 -0700 (PDT)
Subject: System level testing
In-Reply-To: <46FB068A.4050706@gna.org>
Message-ID: <724417.41606.qm@web83309.mail.sp1.yahoo.com>

Hello Rob,

I implemented the plan and updated the examples and
test generator accordingly:

  http://ruby-vpi.rubyforge.org/tmp/ruby-vpi.tgz

Please try it out and send me your feedback.  If
everything goes well, I'll make a new 20.0.0 release.



From snk at gna.org  Tue Oct  9 12:24:20 2007
From: snk at gna.org (Suraj N. Kurapati)
Date: Tue, 9 Oct 2007 09:24:20 -0700 (PDT)
Subject: System level testing
In-Reply-To: <724417.41606.qm@web83309.mail.sp1.yahoo.com>
Message-ID: <834686.82468.qm@web83312.mail.sp1.yahoo.com>

Suraj N. Kurapati wrote:
> I implemented the plan and updated the examples and
> test generator accordingly:
> 
>   http://ruby-vpi.rubyforge.org/tmp/ruby-vpi.tgz

New snapshot is available here:

  http://ruby-vpi.rubyforge.org/tmp/2007-10-09.tgz

The old one has been renamed to:

  http://ruby-vpi.rubyforge.org/tmp/2007-10-08.tgz


From ardencaple at tesco.net  Tue Oct  9 12:48:50 2007
From: ardencaple at tesco.net (Rob MacAulay)
Date: Tue, 9 Oct 2007 17:48:50 +0100
Subject: System level testing
References: <834686.82468.qm@web83312.mail.sp1.yahoo.com>
Message-ID: <05bf01c80a94$45564b60$3564a8c0@CONSTABLE>

Hi Suraj

Thanks for this - might take me a couple of days to test..

Regards,

Rob

----- Original Message -----
From: "Suraj N. Kurapati" <snk at gna.org>
To: <ruby-vpi-discuss at rubyforge.org>
Sent: Tuesday, October 09, 2007 5:24 PM
Subject: Re: System level testing


> Suraj N. Kurapati wrote:
> > I implemented the plan and updated the examples and
> > test generator accordingly:
> >
> >   http://ruby-vpi.rubyforge.org/tmp/ruby-vpi.tgz
>
> New snapshot is available here:
>
>   http://ruby-vpi.rubyforge.org/tmp/2007-10-09.tgz
>
> The old one has been renamed to:
>
>   http://ruby-vpi.rubyforge.org/tmp/2007-10-08.tgz
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.488 / Virus Database: 269.14.6/1059 - Release Date:
09/10/2007 08:44
>
>


From snk at gna.org  Tue Oct 16 12:41:14 2007
From: snk at gna.org (Suraj N. Kurapati)
Date: Tue, 16 Oct 2007 09:41:14 -0700 (PDT)
Subject: Spurious failures with Mentor Modelsim
Message-ID: <412039.91857.qm@web83306.mail.sp1.yahoo.com>

Hello,

I took a fresh look at the problem of spurious
failures with 64-bit Mentor Modelsim 6.2g, where the
example up-counter tests would pass/fail at random. 
In contrast, the same tests would always pass with all
other supported simulators.

By adding a zero-delay null statement at the beginning
of the edge-triggered always block, the problem goes
away and the tests always pass:

  always @(posedge clock) begin
    #0; // zero-delay null statement

    /* rest of the code */
  end

I think the problem is that the cbAfterDelay callback
does not always take you to the top of a time-step
(before any events in that time-step are executed) in
Modelsim.  Instead, it seems that the callback
sometimes takes you to the middle of a time-step
(after some events in the time-step have been
executed).

Any ideas?  Or is the hack of adding the zero-delay
null statement acceptable as a work-around?

Thanks for your consideration.