[PCB_FORUM] Re: Specctra placing vias in positive groundplanes
- From: "Hugh Allen" <hugh@xxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 9 Mar 2005 16:22:40 -0500
Hi Richard:
You can convert your positive planes to wire keepouts (vias ok) with some
spif commands given on the Allegro command prompt prior to exporting the
.dsn and rules.
set spif_keepout_for_shapes
set SPIF_USE_WIRE_KEEPOUT (converts route keepouts (wire and via) to
just wire keepout)).
If you are auto routing on the layers with the positive plane --> keepouts,
you will need to consider the area to various copper (wire, via etc.)
clearances, which default to 0 for areas. Appropriate values can be set in
Specctra keeping in mind that what ever they are set to, applies to all area
instances (keepouts, keepin, etc)
A bonus: Specctra runs much faster with many keepouts, than with many
positive planes of the same shape.
Good Luck
Hugh Allen
Specctra Specialist
CopperCad Design Inc.
www.coppercad.com
hugh@xxxxxxxxxxxxx
-----Original Message-----
From: richard moffat [mailto:richard.moffat@xxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, March 09, 2005 3:51 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Specctra placing vias in positive groundplanes
Hi all
I think this was solved some time ago, but I can't remember the
solution:
If I have positive planes, say on top side, Specctra treats the
positive planes as a via keepout. How do I tell Specctra that it's OK
to put vias there for other signals?
Cheers,
Richard
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