| Electronics > Projects, Designs, and Technical Stuff |
| How to even start routing this? |
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| tggzzz:
--- Quote from: ejeffrey on August 02, 2019, 12:35:12 pm --- --- Quote from: tggzzz on August 02, 2019, 08:33:09 am --- If you do, make one layer a solid ground plane and another a solid Vcc plane. If they are inner planes then it is easier to probe and modify signals. If they are outer planes then EMI problems will be minimised. Choices, choices :) ) --- End quote --- Hardly a choice. The EMI advantage of outer planes is hardly worth the ease of debug and tracing for what I assume is a one off. Plus for a project that is basically intended to show off old school 74 series logic design, it hard to give up the appearance of a nicely routed board for solid planes. --- End quote --- Agreed. But the OP hadn't bothered to divulge that information when I wrote that post. |
| SiliconWizard:
Just a tip, didn't really look closely how well your autorouter did, but if using autorouting, I would first hand-route all bypass caps and power supplies, then let the autorouter handle the rest. Autorouters can do a pretty atrocious job at routing supplies, and often like to create horrible loops, especially on a 2-layer board. Of course to be half successful at routing this, placement will be key. |
| Joanna_H:
--- Quote from: ejeffrey on August 02, 2019, 12:35:12 pm --- --- Quote from: tggzzz on August 02, 2019, 08:33:09 am --- If you do, make one layer a solid ground plane and another a solid Vcc plane. If they are inner planes then it is easier to probe and modify signals. If they are outer planes then EMI problems will be minimised. Choices, choices :) ) --- End quote --- Hardly a choice. The EMI advantage of outer planes is hardly worth the ease of debug and tracing for what I assume is a one off. Plus for a project that is basically intended to show off old school 74 series logic design, it hard to give up the appearance of a nicely routed board for solid planes. --- End quote --- Yeah, it's one off, showing off old 74 series, easier for someone looking at it to comprehend (well, the ic's at least.) |
| Joanna_H:
--- Quote from: voltsandjolts on August 02, 2019, 01:02:19 pm ---4 layers will save your sanity. pcbshopper.com is your friend. (no affiliation). --- End quote --- Thanks for the link.. cheapest for a 2 layer with delivery is about £20, cheapest for a 4 layer with delivery is about £40 So ... hmmm... |
| mikeselectricstuff:
Placement Placement Placement Gate and pin-swapping for multi-gate packages, swapping gates between packages where possible. Do you really need to keep it to two layers ? How many of these are you making? - unless it's thousands then your time getting to 2 layers is probably worth mor than the additonal cost of 4 layers , bearing in mind that it can probably be smaller on a 4L PCB as well. |
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