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Date: Sun, 25 Oct 2015 01:06:01 +0000
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Subject: Re: [geda-user] Star shorts
From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Sat, Oct 24, 2015 at 8:18 PM, Stephan Böttcher (geda AT psjt DOT org) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>
> DJ Delorie <dj AT delorie DOT com> writes:
>
>> Of course, anything like this would predicate a new DRC :-(
>
> DRC should be something that can also be applied to the Gerber layout,
> i.e., it should look at the actual copper.  No need for a new DRC.
>
> The star ground is a netlist issue, LVS.  That is part of 'optimize rats
> nest' in pcb.
>
> I think is is good to keep that distinction, between DRC and LVS.
>
> If some copper object is designated as the connection between two ground
> nets, the 'optimize rats nest' sees two nets and the requirement that
> both connect to that object, and that there are no further connections
> betwenn the nets.
>
> I don't see that there is much that needs changing.  Maybe not much more
> than a flag on a layer (belonging to a copper group), or a via/pin, that
> says: Ignore this for LVS.  The copper object can be part of a
> component, to represent the required connections.  Allow a pin or pad to
> have two or more pinnumbers.
>
> My ground nets newer connect in a star topology.  There are power return

Mine do and what I am talking about will add a lot of other
functionality that I think people will use.

Wouldn't you like to have route as bus as an option?

> routing, chassis ground, analog reference ground, digital reference
> ground.  And often there need to be multiple conections between the
> those ground nets, e.g., close to each ADC between analog and digital
> ground.
>
> --
> Stephan



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