[PCB_FORUM] Re: Dynamic Planes on Large Boards

Hi Barry,
Here's a response I received from Cadence on your subject. I tried the
recommendations below
but the system still significantly slowed down, so I ended up adding
multiple positive 
shapes on the outer layers, however, after adding these shapes (about
50-60%) 
the system started slowing down again.  I also had all the internal
planes set as negative planes.
 
-Stephen
Siemens Communications
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Regarding 40199632, When I add an outer layer gnd positive flood, my
system slows down

 

Am I correct in assuming that you are adding a dynamic shape for the
positive flood?  It is recommended that you save adding copper shapes
until the end of the design phase - but we all know that is kind of
wishful thinking.  Anyhow, yes, this will slow down the system response.
When adding the shapes you can defer performing dynamic fill in the
Options filter or you can Disable it in the Drawing Options
(Setup>Drawing options).  This will basically act like the shape is not
there (just a block without clearances).  When you are ready to process
you can set the plane to Smooth and update it (drawing options form
again).  If you need to see the pad, via, cline, shape etc clearances
then you could set the shapes to Rough (again in the drawing options).
Then again before you go to do artwork you would need to change that to
Smooth.  This will help speed it up a bit.  The Rough setting doesn't
give you 100% resolution on things like the number of tie points a pin
or via might have to a plane but is good for working with coverage
issues.  If the planes are set to Rough and you go to generate artwork
don't worry - the system will make you go back an update them to smooth.
Let me know if this answers your question.

 

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________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Unruh Barry
Sent: Tuesday, August 15, 2006 3:56 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Dynamic Planes on Large Boards


All
      My apologies if this has already been covered on this forum.
 
     Does anyone have any tips for dealing with dynamic planes on large
boards?
I like the features it offers but chews up too much memory.
 
These are some of the things I do to reduce processing time....
 
1. Work on a local disk rather than swapping across a network.
2. Use straight rather than round acute angles.
3. In the case of external planes... push out the clearances in order to
minimize the complexity of the plane.
4. In the case of edits to a layer with an existing dynamic plane...
       Disable the dynamic shapes and move off to the side until the
edits are done, then move back and change to smooth.
 
Maybe the rough mode has some benefits?
Any other methods?
 
Barry Unruh
Thomson Grass Valley

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