symbol PCELL extraction issue.

Andrew,

 I loaded this PCell into my library and tried to netlist it with Virtuoso CDL Out tool (File->Export->CDL) and it fails in the same way stating that the instance was changed and need to re-extract the containing schematic.  It seems to me that this is some type of Cadence Wrapper software issue.

 If you might have some other tricks up your sleeve, it would be nice to try, but thank you for your help.

Mitchell Cohen

Mitchell,

I'm assuming you've placed an instance of busset in your schematic, checked-and-saved that schematic, and then tried to netlist your schematic (rather than netlisting busset itself)?

If so, which subversion of IC5141 are you using (type getVersion(t) in the CIW to find out)?

Thanks,

Andrew.

Andrew,

You are correct with the order of operations I took to try and netlist the schematic.

sub-version 5.10.41.500.6.145

Thanks

Mitchell Cohen

Mitchell,

That's recent enough (from October 2010), so I would expect it to be OK. Can you post the si.log file that you get from the busset example. I've tried various things to break it - and can't. Even loading "busset.il" after creating the schematic (assuming that I don't still have the schematic open) works. If I have the schematic open it prompts me to save it (and then it fails because it hasn't been check-and-saved, but that's reasonable).

I assume you're only loading busset.il from the CIW, and not putting a load in a libInit.il, .simrc, or .cdsinit (which wouldn't work anyway, but would not cause this failure).

Andrew.

Andrew,

 I to load busset.il i used 'load("~/busset.il")' . Below is the output of the si.log.

Loading the msd site .simrc file for auCdl.... 
Running Artist Hierarchical Netlisting ...
ERROR: Netlister: symbol of instance 'I0' modified, please re-extract cell 'test_ROM'.
End netlisting Jul 27 07:36:05 2011
ERROR (OSSHNL): Error(s) found during netlisting. The netlist may be corrupt
 or may not be produced at all.
To generate correct netlist, fix the errors and re-netlist.

Mitchell Cohen

Mitchell,

My guess is that you have the variable:

simSymbolModifiedAction="error"

set in a .simrc somewhere (probably the "msd site .simrc for auCdl" referenced in the si.log file). This is not the default (the default value is "ignore". 

If I set it to "error" myself in my local .simrc file, I see the same error as you.

Regards,

Andrew.

Andrew,

 I dont know how you do it, but you have solved my problem.  Thank you for all your help!

Just a quick question about changing this variable, could it cause problems for full chip netlisting by ignoring if subcell's symbols have been modified or not?

 Thank you!

Mitchell Cohen

Mitchell,

There's a risk you might have a symbol different from the instance - and so the connectivity might get messed up. You could set it to "warning" rather than "ignore" - but of course that would require you to actually look at the log file.

The chances are other things will find the flaws, and in fact the default from Cadence is "ignore" anyway...

Regards,

Andrew.