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Date:	Sun, 13 Sep 2015 18:56:02 +0000
Message-ID:	<CAM2RGhRGeopE9e-_C3pjjurj258U_7BiBNh-qMfiKUXv_gwBCA@mail.gmail.com>
Subject:	Re: [geda-user] RFC: pin attribute remapping
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 Sun, Sep 13, 2015 at 6:40 PM, DJ Delorie <dj AT delorie DOT com> wrote:
>
>> The second form allows swapping of pins between packages.
>
> Is this a general form of swapping gates between packages?  Like
> beween 7400's?

I think I fall in the same category as DJ here. I don't understand
what problem this is intended to solve.

> While considering the pin/gate swapping problem, I did encounter one
> case where "refdes" wasn't globally persistent enough: if you have two
> 7400's and you swap gates between them, the "refdes" in the schematic
> is no longer accurate, and should be changed to reflect the swap.
> But, the refdes is what you're using to globally identify "this
> symbol" in the schematic.
>
> Aside from assigning GUIDs to each symbol as they're instantiated, I
> don't have a good solution to this.
>
> Using a page in a heirarchy, where a gate is swapped between devices
> in one instance within the heirarchy but not another causes even more
> problems, because there is now no "one schematic" that can reflect the
> as-built. (swapping pins differently in instances is a similar but
> smaller problem)
>
> I think it's possible to solve these in a post-flattened world, since
> pcb could know what it did relative to the flattened netlist, although
> what to print for the refdes might get confusing (if it isn't already
> with heirarchy ;).  It's moving those changes back to an as-built that
> retains the heirarchical format that's tricky.  Annotation an as-built
> *might* require a shared page to be separately instantiated for each
> use in the heirarchy.



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