Flat mode extraction error !!!

Hello Everybody,

I have a problem during extraction of a layout. When I extract it in
flat mode it gives me a "bad open in .pdv file" warning and the
extraction fails. When I extract the same layout using other modes
(macro cell, full hier, incremental hier) it works ! (It does not give
me any error messages). I'm not able to figure out why ?. Does anyone
have a clue as to what is happening here. Any help in this regard is
sincerely appreciated.

Thanks in advance.

Regards,
~psitham

 

This is a problem we have seen in the past. Please include the version
you are running when you ask these kinds of questions. The -V command
line option will show this information.

Assuming you are not running an older build that has one of the bugs we
have fixed, the only thing that comes to mind is that someone is
deleting the .pdv files while Diva is running. That is what the message
means, Diva tried to open an existing .pdv file and found it was not
there.

If you find you can reproduce the problem with a recent build, and
people are not deleting .pdv files, there is nothing you can do but
submit the data as the test case for a P0 bug report.

 

Thank you for your response. The version of icfb I'm using is
4.4.5.100.10.

Yes I can reproduce the problem. Everytime I do an extraction for a
particular layout, it gives me this error. The same extraction rule
file works fine for other layouts.

~psitham

 

I found PCR 308360 which was fixed in 4.4.5.100.17 for this same
problem. I don't know if you can get the more recent build since 5.0.33
is the oldest release we still support. Staying current with software
releases IS important.

Reading the PCR database reminds me of another cause of this error
message. If your design contains PCells, they may be using the private
Diva layer manipulation functions layerOr, layerAnd, layerSize, etc.
While moderately safe to use most of the time, they are almost always a
problem if the PCell is evaluated while Diva is running. To check if
this is the case, open the top cellview, set the view start and stop
levels to 0 and 32, redraw. If the error goes away, this is your cause.

 

Can u tell me a little more specifically how to do this. I'm not
exactly able to zero in on where there is this top cellview and where
to set the start and stop levels. I'm using Cadence Virtuoso layout
editing tool. There are options where I can set the display levels, is
that what u meant ?. Thank you in advance.

~psitham

cause.

 

Yes, it is the display start and stop level. In current releases it is
in the Options/Display menu item. I don't remember where it is in 4.4.5

 

Yes it is the same in version 4.4.5 as well. I tried it and it still
does'nt work, gives me the same error. Is there any other direction we
can work on towards solving this ?. Thank you for your response.

~psitham

4.4.5

 

You have reached that special place known as "I need to see the data".
You'll have to assemble a testcase and submit a bug report. The odds are
good that it will not reproduce on a supported release since a fix was
done shortly after the build you are running for a problem that sounds
like yours. You may be better off to install a supported release and see
if it still has the problem.