( ESNUG 395 Item 6 ) --------------------------------------------- [06/26/02]
From: Jay Pragasam <jlk@brecis.com>
Subject: What About Rectilinear Block Designs In PhysOpt/Jupiter Flows?
Hi John,
For our upcoming hierarchical design chip, I see that our blocks will be
well utilized based on the connectivity and functionality -- if our blocks
are allowed to be rectilinear (non rectangular) in shape -- rather than the
conventional rectangular shapes. Even though the EDA tools out there claim
that they can handle rectilinear shapes, I am very positive that I will run
into a lot of implementation and integration issues in doing so. So I am
wondering if your readers have some experience in handling rectilinear
blocks, especially with Synopsys (PhysOpt)/ Avanti (Jupiter/Apollo) tools.
Some stuff that I am curious about are
1. How difficult is it in getting the pins assigned when the number of
edges exceed 4?
2. Is power routing capable of dropping straps of different lengths
because of different dimensions in one direction or do I have to
manually alter the lengths?
3. Will writing out the GDSII have any problems?
4. Can the parasitic extractor handle arbitrary shaped blocks?
Plus is there anything else that would make my life miserable here?
- Jay Pragasam
Brecis Communications San Jose, CA
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