[SI-LIST] Re: Comparing layers on two artworks
- From: Yafei Bi <yafei_bi@xxxxxxxxx>
- To: Nima Lotfi <lnima@xxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Wed, 16 Apr 2008 14:59:02 -0700 (PDT)
I am surprised that there isn't such tool in PCB design.
In IC layout tools, there is an utility called LVL - or Layout vs. Layout.
You can compare two layout file layer by layer, or you can define the layers
you want to compare.
This is useful for the same reason when rev. silicon on a few select layer.
Quite often some cell/layout/polygon/wire got moved, LVL is the only way to
make sure you are only changing the layer you are supposed to change.
best
Yafei
----- Original Message ----
From: Nima Lotfi <lnima@xxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Wednesday, April 16, 2008 11:02:46 AM
Subject: [SI-LIST] Comparing layers on two artworks
I'm looking for input on a tool for comparing artwork. I've done a
quick search of the archives and haven't seen anyone discuss this topic.
Whenever I re-spin a board it involves changes to perhaps about 10% of
the nets (a typical board would have 5000 to 8000 nets), however, there
is a potential that tools or layout person that is running tools may
make unintended changes to traces that should not have been touched.
This is has become more of problem as layout resources are outsourced,
and they are often not collocated with hardware designer. =20
Since most signals of importance are often constrained, changes are most
likely insignificant or significant changes get caught by a design rule
check. However, if a constraint on a critical signal is missed than
there can be potential exposure and risk to the design cycle. I'd like
to minimize this risk, and that brings me to my question
I am wondering if any one is aware of any tools that can compare and
report changes on different artworks layer by layer.
The design tools we use are Cadence Allegro, and the output we generate
is ODB+. =20
Best Regards,
=20
______________________=20
Nima Lotfi, P. Eng=20
Hardware Design Engineer=20
Nortel
Calgary, Alberta, Canada=20
758-7786 ESN=20
(403) 769-7786 Direct=20
(403) 769-7176 Fax=20
LNima@xxxxxxxxxx=20
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