With a negative plane you have to change the thermal and antipad sizes. The
artwork is generated by flashes, not with a drawn plane.
Or go with a positive plane :{
--
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272 Fax: 503-627-5587
http://www.tektronix.com http://www.pcb-designer.com
It's my opinion, not Tektronix'
-----Original Message-----
From: richard moffat [mailto:richard.moffat@xxxxxxxxxxxxxxxxxxx]
Sent: Thursday, October 28, 2004 11:45
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Negative Shapes: via voiding
Hi
Hoping this hasn't been asked before:
I have set a NET_SPACING_TYPE on a negative shape (plane) to meet
isolation requirements. The via-to-shape and pin-to-shape spacing rules
are not being followed.
According to Cadence, the via antipad has priority. Can I force the
shape to follow the NET_SPACING_TYPE rule?
(I don't want a positive shape; I think it would kill my design since
it has 22000 vias.)
Cheers,
Richard
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