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From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Wed, 3 Aug 2016 01:03:11 +0000
Message-ID: <CAM2RGhRAFHxuUL4jBo5Yuqta2rMBVwDepi5tQ1-zR56UM6BKWQ@mail.gmail.com>
Subject: Re: [geda-user] Wilkinson splitter - how to implement and use?
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On Tue, Aug 2, 2016 at 11:33 PM, Larry Doolittle
<ldoolitt AT recycle DOT lbl DOT gov> wrote:
> Evan -
>
> On Tue, Aug 02, 2016 at 04:47:05PM -0400, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>> On Mon, Aug 1, 2016 at 6:44 PM, Erich Heinzle (a1039181 AT gmail DOT com)
>> [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>> > If pcb were modified to honour the flag, I could easily add a "nodrc" flag
>> > as discussed to the non-pad line element outputs of the utility.
>> I think we need something more subtle than nodrc. Having DRC turned
>> off for a specific footprint or any other board area is just as bad as
>> having DRC return bogus warnings/errors.
>
> I agree in general.  For the copper structures wished for to handle
> star grounds and Wilkinson splitters, we actually want the layer
> to exist for DRC purposes, but not for netlist purposes.  So a
> "nonetlist" flag?

Pads need to be distinguished from "connection points" in DRC.
Footprints have pads, microwave structures have connection points.
There are a lot of differences.

>> The reality is that these structures are not footprints but functional
>> elements. They have design rules, just very different ones with higher
>> orders of complexity. We can't really have pcb process the full
>> complexity of these rules across the whole domain from DC to daylight
>> (or shorter) because of limitations in processing. It would also
>> require a level of developer time which is far past what pcb-* has
>> right now.
>
> Without diving into a more general capability set, this particular tweak
> _sounds_ simple enough to me.  But my limited experience poking around in
> the internals of the existing pcb code base makes me predict it will be
> difficult to do without breaking somethings else.  Maybe I'll look at
> pcb-rnd and see if that looks any more promising.
>
>   - Larry



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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