[PCB_FORUM] Re: RS274X Artwork Generation Question
- From: george.h.patrick@xxxxxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Wed, 20 Oct 2004 14:19:59 -0700
Oops, sorry folks. That was not intended for the list.
Just another loose nut on the keyboard :b
--
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: Patrick, George H
Sent: Wednesday, October 20, 2004 14:14
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: RS274X Artwork Generation Question
Alan:
Why in the world do you still use RS274C instead of using RS274X?
Just curious, not intended as a flame :)
--
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: Ritter, Alan [mailto:Alan.Ritter@xxxxxxxxxx]
Sent: Wednesday, October 20, 2004 12:55
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] RS274X Artwork Generation Question
I'm doing a quick&dirty board to test out a concept and was planning on
going to one of the Internet quick-turn places (pcbexpress.com) for a
handful of prototype boards. (Using Allegro 14.2)
Normally, we would generate 6x00 artwork with a separate aperture file, but
pcbexpress wants RS274x artwork. No problem, I figure, just change Allegro
to generate RS274x and go for it.
Well, not so fast, copper-on-fiberglass-breath...
The board has a split ground plane (DGND and CHASSIS). Normally, I would
set up the shapes to cover the holes/pins connected to the respective nets
and add anti-etch lines (class ANTI-ETCH, subclass GROUND) to form the
barriers between the shapes. Then plot as a negative plot with the
anti-etch turned on along with pins, vias and the etch layer with the
shapes, but tick the "suppress shape fill" option.
However, in RS274x, the "suppress shape fill" option is greyed out. No
problem with that, since the pins, vias, etc., plot with antipads or
thermals, depending on whether they're connected to the ground signals or
not. The problem is, my anti-etch lines don't plot at all, so there are no
barriers between my ground shapes. If I set the "shape bounding box" value
to something non-zero, I get a plotted shape outside my outer (CHASSIS)
shape the width that I specified.
This is thoroughly annoying, and I can't see that I am doing anything
fundamentally different from what works just fine with 6x00 artwork
generation.
Anybody else have any bright ideas?
/s/jar (alan.ritter@xxxxxxxxxx)
http://www.mtritter.org
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