[SI-LIST] : Split Plane

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From: Brad Crowell (crowell@amirix.com)
Date: Fri May 19 2000 - 14:04:42 PDT


I have been lurking in the shadows of the SI list for some time now, but
have come across a situation that I could use some advice on:

I am working on a board design that is using the following stackup:

1 - SIGNAL
2 - GROUND
3 - SIGNAL
4 - SIGNAL
5 - GROUND
6 - 5V PLANE
7 - 3.3V PLANE
8 - GROUND
9 - SIGNAL
10- SIGNAL
11- GROUND
12- SIGNAL

My problem is that we are running out of routing resources. Thus,
it has been suggested that a few traces could be routed on layer 6,
the 5v plane. The intent would be to route some traces for the 3.3v
devices which are located away from the 5v devices on the board. This
would reduce the effect of any splits in the plane. Also, since there
is a ground plane available as a reference for every signal layer,
a split in a supply plane shouldn't have much effect, if any. I am
inclined to think, with my limited SI experience, that this should
be ok, but would appreciate comments from some of the experts.

Thanks,
Brad
***************************************
Brad Crowell
Hardware Designer
AMIRIX Systems
***************************************

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