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How to even start routing this?

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Joanna_H:
Hi all,

Was just wondering how any of you would even start to attempt manually route this rather crazy board?  I could just auto-route it (which does work.)

And yeah, not fully placed yet.....



Thanks for any advice.

Joanna_H:
Forgot to say, it's a two layer board.

martin1454:

--- Quote from: Joanna_H on August 02, 2019, 06:42:10 am ---Forgot to say, it's a two layer board.

--- End quote ---

Good luck! it is possible, but will take time! I would start by doing the simple connections (the straight from U22 to U18 and so)

Dubbie:
Just start.

basinstreetdesign:
If I was asking this question then I would have to conclude that I wasn't finished placing it.  Placement generally takes more than half the total time.  Shoot for the lowest average trace length no longer than about 3/8 of a boards side dimension.  This is from Rents Reasoning.  See here:
https://en.wikipedia.org/wiki/Rent%27s_rule down the page under "Rentian wirelength estimation".

But a bigger question may be "Why only 2 layers?";  the cost jump from 2 to 4 layers is not that bad anymore.  Getting rid of the power and ground distribution from the signal planes is easily worth the cost.

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