[PCB_FORUM] Re: env variable

We are working on making this the default behavior.
Unfortunately, we sometimes need to introduce new functionality and hide
it behind a variable because it hasn't been fully tested. 
This variable will rename any RefDes in an ECSet if that same RefDes is
renamed in the design. We recently discovered a problem in cases where
RefDes renaming included purely numeric names (e.g. 1, 2, 3, ...). I'm
guessing that the majority of you use some kind of alphabetic prefix for
your RefDes (e.g. U1, A5, etc.). This particular case was accidental but
I just wanted to pass on the following recommendation: If you are going
to make use of this variable, make sure you are using a lettered prefix
for your RefDes.

Regards,
Dennis Nagle
Allegro PCB SI Product Engineer

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Schwartz,
Jerome
Sent: Tuesday, October 03, 2006 11:20 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: env variable

Been there, done that. Major problem.
This should be the default setting. 


Jerry

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Tony Stanislao
Sent: Tuesday, October 03, 2006 11:00 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] env variable


I recently renumbered a board design that was heavily constrained in
V15.5.1. After I read in any third party netlist I always go to Setup
advisor and run device setup. I run DB doctor after that and then I open
my CM spreadsheet and run an audit of my ECsets. Well on my renumbered
board my constraints lit up red with errors and my audit showed numerous
topology

errors. All my pin pairs hads the new ref des but all my ec sets showed
the old ref des.

I had to manually view every constraint in SigXplorer and update CM.
This
was a big waste of time for me. I contacted Cadence about this problem
and was told to put this variable into my env file.
I thought I would share this news with my fellow designers. This
variable must be present prior to renumbering your board. I advise
everyone to please place this variable in their env file os suffer the
consequenses.

set UPDATE_ECSET_REFDES

Regards,

Tony Stanislao
Senior Designer
FreedomCad Services, Inc.


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