[PCB_FORUM] Re: Dual Plane VIA Connection Question
- From: "westfeldt" <westfeldt_nbcd@xxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Sun, 12 Mar 2006 07:52:54 -0700
I would create a route keepout on the internal layer, so that automatic
plane void clears the area around the vias. I would then have to accept,
and perhaps note, the drcs that would be caused by the two vias being in the
middle of the route keepout.
Patrick Westfeldt, Jr.
720-406-0887
_____
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Vince Di Lello
Sent: Saturday, March 11, 2006 3:27 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Dual Plane VIA Connection Question
Here's hoping one of you great designers out there (and Allegro expert) can
help me out . in the picture below you will see a light blue external (Top
Side) 3.3V plane. Inside this board (but not shown) is a separate 3.3V
plane. What I would like to do is have the (3) vias at the top of the
picture (coming off the electrolytic cap) make connection with the internal
3.3V plane and then connect to the electrolytic cap with traces as shown in
the picture. The 3.3V then travels down this small external plane coming
into contact with some other capacitors and ultimately ends at the two vias
at the bottom which carry the current from the top side of the board to the
bottom side of the board where in turn there are two traces that connect to
two bottom side pads of a bottom side connector. Now for my problem - the
two vias at the bottom of the light blue area are now also connected to the
INTERNAL 3.3V master plane (for clarity sake I did not turn that plane on).
I DO NOT WANT them to connect to the internal 3.3V plane. I want to force
the 3.3V signal to have to travel through the caps and then into the
connector pads on the external layer only. Is there a setting or a property
that I can add to those two vias so that they get connected to the small
external 3.3V copper plane, but NOT to the INTERNAL 3.3V master plane?
Any help, especially on a weekend, would be greatly appreciated. Thanks in
advance and I hope all who are listening will have a great weekend - at
least what is remaining of it. Thanks again.
Vincent Di Lello, CID+
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