Re: [SI-LIST] : Split Plane

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From: Christoph Hillen (Christoph.Hillen@aachen.utimaco.de)
Date: Mon May 22 2000 - 10:34:45 PDT


Doug,

could you explain what the problem is about planes with "arms" or other
"not
simple" structures?
Why would you avoid that? And what if the planes are too close together?

Best regards,
Christoph Hillen
Utimaco Safeware AG
Germany

>Doug <dmckean@gte.net> on 20.05.2000 21:38:15

>Please respond to si-list@silab.eng.sun.com

>To: si-list@silab.eng.sun.com
>cc: (bcc: Christoph Hillen/Aachen/Utimaco/DE)

>Subject: Re: [SI-LIST] : Split Plane

>Brad,

>Not sure how much of a bind you're in and I don't
>know if your configuration allows it, but I've done
>something like -

>Combined layers 6 and 7 into layer 6 (layout of the
>board allowed that). Turn 7 into a ground plane.
>Turn 8 into a signal plane.

>Huge BUT here ...

>In doing this, care should be taken.

>1. The two adjacent power planes should have simple
> geometries - rectangle or square shape. No "arms"
> in them (traces off the power plane for sourcing
> or sinking power).
>2. The power planes should be well separated.

>If any of these get compromised, don't do it.
>Should normally be avoided if possible. If there's
>a simpler way, go with it.

>Regards, Doug McKean

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