Support vias in topologies

[tjknoth]

instantiate a phantom pin per-via to enable usage in topologies.
Shouldn't be merged until a jitx-client bugfix gets through.

[callendorph]

I tried running the diff-pair via structure example on 3.17.0 in examples/via-structures/diff-via-structure.stanza and I had trouble routing:

The diff insertion point I can't route to the diff-pair via structure.
Also note that when I show the labels I get p and p - it would be very useful if the labels showed p and n
When I select pads and press a - I see no other pads highlighted - so I think there might be an issue with the example at least or the generator at worst.

[tjknoth]

I forgot some net statements -- fixed that, which I think should enable routing.
Also changed the names to n and p.

When I select pads and press a - I see no other pads highlighted - so I think there might be an issue with the example at least or the generator at worst.

Do you mean when you select one of the two pads n or p? That's still happening even after i fixed the nets. Still poking.

[tjknoth]

Actually, I think the possible ends thing might be an issue with the example.
If you select one of the pads on the capacitors and select possible ends (ctrl+a), it will highlight the pads on the diff pairs.
Is there a different behavior you expect?

[callendorph]

Diff Pair insertion point example seems to be working in 3.19.0:

[tjknoth]

Yep -- it won't work if you run from a clean state until 3.20 due to the placer bug.
I'll get this merged today anyways.

[callendorph]

👍 Thanks for your help on this.
The unit tests pass when I run them locally.

[callendorph]

The only concern I have here is the symbol for the diff-pair via structures being two separate schematic symbols in this approach. I think that will make the schematic harder to read. Assuming the user uses the create-via-structure function - then at least these two symbols will be in the same sch group so they will be group together a bit.
I think this is fine for now until we can integrate via structures more directly in the JITX runtime.

[callendorph]

Seems like the CI is fixed now too 🎉 🦖