On Fri, Jun 16, 2017 at 7:51 AM, mike.v...@gmail.com <mike.v...@gmail.com> wrote: > 2017-06-16 8:19 GMT+02:00 Luke Kenneth Casson Leighton <l...@lkcl.net>: >> >> >> there's not really any other options: you can see how little >> clearance there is to the edge of the board: it's flat-out impossible >> to bring tracks in either in between those two sets, or round the >> back... and you don't want to anyway: they're differential pairs (up >> to 1ghz clock rate) because this is HDMI. >> > > Hmm. Then how are other users of this connector doing it? This seems like a > generic problem. The solder technique is generic afaikt. > 1. Either they are using smaller width tracks and are passing between the > left hand pads.
like i said: there's not enough room to get that many tracks between the pads, and it would violate differential-pair rules to do so. > 2. They have via's right to the pads. But that's very close to the edge. exactly. > The options I see... > . find other schematics using this connector. none. > . Use smaller width tracks. can't. > . Cut the pads tight a little shorter and place the via's to the right > creating a bottleneck but stil far enough from the edge possible. > . The above but to the left, via's in the middle. possible but risky. _______________________________________________ arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netb...@files.phcomp.co.uk
