On Fri, 27 Nov 2009, Gordon Hope wrote to us saying :
I believe the right approach would be to extend bottom side traces in theaffected area and add a pad. Then go to the top side, ripup theappropriate connection and re-route to the new bottom side pad...
I believe the right approach would be to extend bottom side traces in the
affected area and add a pad. Then go to the top side, ripup the
appropriate connection and re-route to the new bottom side pad...
That sounds like the wrong order to me. Starting from a trace with a via
in the middle of the top-side section, I would proceed as follows:
- Identify which direction from the via has more bottom side space
- rip-up the top side trace in that direction
- manually route from the other end of that airwire, on top side
- drop an intermediate point just short of the shared via
- swap to bottom side
- finish routing to the via
That last step will automatically create a new via to act as your second
pad. It's better than adding a pad manually because Eagle knows from the
get-go that it's part of the signal you're modifying.
--
Rob Pearce http://www.bdt-home.demon.co.uk
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