Auto Layout - Wire/Net placement incorrect
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oldmanmaker
You can see on the attached image, that after Auto Routing, I was slightly confused as to why there was still an airwire indicated by my white/gray arrow - as it looked like everything was connected, including the thick yellow net for 3v3 net. What had actually happened is that the router had created a net wire correctly, but routed it to the EDGE of the bottom horizontal yellow trace - where my other arrow is pointing. Clearly, this meant that the wires were not connected.
I've added support to the project and I will leave it in the current state where you will see this error.
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collinsemasi
Hi oldmanmaker
Thank you for reporting the issue. I can see that indeed the trace only barely touches the other horizontal trace resulting in an incomplete connection.
Do you know if that was the final auto-layout solution provided?
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oldmanmaker
collinsemasi I think it was - I noticed in quite a few of the progressions that airwires were coming up in the DRC as I kept that open during the Auto Layout process
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collinsemasi
oldmanmaker: Okay, thank you for the info. I'll pass this ticket on, but in the meantime, you could improve the results by just changing your component placement strategy to minimize the routing complexity.
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collinsemasi
oldmanmaker Let me know if you’d like any tips on optimizing placement!
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oldmanmaker
collinsemasi thanks for that. I'd be interested to hear your thoughts on how to improve this for sure. I did attempt to make key component the centre piece as well as ensure my caps were close to the VCC pads first and the J1 connector as close as possible to those etc. Anything you can suggest would be much appreciated! Cheers
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collinsemasi
oldmanmaker: I find that doing the following improves the routing results;
- Rotating J1 and J2 180°
- Rotating R2 90°
- Rotating R1 -90°
Check attached image for reference
Also, let me know what you think.