[PCB_FORUM] Re: Negative Shapes: via voiding

That makes sense.  

However, there is the capability for RS274X negative shapes to have
voids drawn by a negative layer polarity within the gerber film.  That's
how drawn voids are done, eg a circle or a square.

Maybe an enhancement well needed?

>>> george.h.patrick@xxxxxxxxxxxxxx 29/10/2004 8:10:33 a.m. >>>

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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