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Date: Wed, 16 Jul 2014 11:08:01 +0100
From: "Peter C.J. Clifton" <pcjc2 AT cam DOT ac DOT uk>
To: geda-user AT delorie DOT com
Cc: Bernd Walter <ticso AT cicely7 DOT cicely DOT de>
Subject: Re: [geda-user] opper ring flag for vias and pins
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On 2014-07-15 19:58, Bernd Walter wrote:
> On Tue, Jul 15, 2014 at 10:59:07AM -0700, Dave Curtis wrote:
>> On 07/15/2014 10:33 AM, Bernd Walter wrote:
>> >Because I just remember this, while I wrote about holes and multilayer.
>> >I would love to selectively switch of the copper ring per layer on
>> >vias and pins.
>> >The reason is that I only need to ring on solder side and on connecting
>> >layers.
>> >On layers I don't need the ring it just reduces space, especially
>> >problematic with a via field e.g. inside a BGA.
>> >It is not just routing space - the wider space between vias and pins
>> >are preferable for groundplanes too.
>> >
>> So one thing I thought of that might help:
>> Set the pad diameter on the Pin[] to the small diameter that you want 
>> on
>> the inner layers.  Larger pads cans be had on comp and solder side by
>> drawing coincident Pad[] elements with the same pin number.
> 
> This could work as a hack for most cases.
> But there are oviously some drawbacks.

You need to be able to remove inner layer pad annuli completely for 
signal integrity reasons on some high-speed lines.