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Adding ghost tracks between multiple ground points
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r.h.m.timmer 6 years ago
So I have a board that uses a header to directly connect to a raspberry pi. The Pi has multiple GND, 5V and 3.3V connectors. When using auto-router it insist in connecting all ground pins together, while the ground pins are already common in the pi itself. This creates unnecessary vertical tracks blocking horizonal tracks if I wanted a single sided board. Is there a way to only connect to the most favourable ground pin (and 3.3/5V pin at that), for example by creating ghost tracks? Ive tried adding inner tracks connecting the grounds together and force auto router to use only the top layer for routing, but it always removes the layers that it can't use, even when disabling 'remove existing tracks'.
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r.h.m.timmer 6 years ago
Oh btw: I know I can disable auto-routing for just the ground tracks, but then I usually can't find neat tracks for all the grounds.
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andyfierman 6 years ago
Your project is private so only you can see it. Without sight of your project the following comments may possibly be irrelevant but here they are anyway: 1. Reducing the number of ground and power connections can easily cause signal and/or power integrity problems. 2. Using only a single sided PCB can cause the same problems. 3. If you have your PCB made by EasyEDA it costs the same to have a double sided PCB as opposed to a single sided board. For some background to this: https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f
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r.h.m.timmer 6 years ago
For reference see: https://cdn.sparkfun.com/assets/learn_tutorials/3/2/5/bplus-gpio.png So for ground, I don't really care if it connects to pin 4, pin9, pin 20 or any of the other ground pins. However, I don't need any traces from pin 4 to pin 9, as these are already connected internally.
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andyfierman 6 years ago
Sorry but your project is private so only you can see it. Without sight of your project it is hard to make any meaningful comments based on the information you have given us so far.
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bigexxx 5 years ago
i have exactly the same problem, it doesn't need to share a particular project, we all make a raspi HAT products, how to make some pins internally connected ?
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andyfierman 5 years ago
@bigexxx, Please do not assume that "we all make a raspi HAT products". If you would like help on a particular issue, please be prepared to provide enough information from which others - who may be more knowledgeable about signal and power integrity or PCB layout but may be less so about Raspberry Pi HATs - may be able to offer useful suggestions.
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