2017-06-16 8:55 GMT+02:00 mike.v...@gmail.com <mike.v...@gmail.com>: > > > 2017-06-15 21:01 GMT+02:00 Luke Kenneth Casson Leighton <l...@lkcl.net>: > >> okaay so the HDMI connection isn't so hot on these 2.7.4 boards. it >> works... but there is significant line-interference under certain >> circumstances, even for 720p50. 1080p60 there is huge amounts of >> interference resulting in green horizontal lines. *sigh* i'll just >> have to have another go at the layout... blech. > > > How about having GND tracks parallel to each Tx/Rx pair. Creating a sink > for EM signals to drain into instead of crossing over. > > ---GND----0 > ---Tx------[ ] > ---Rx------[ ] > ---GND----0 > ---Tx------[ ] > ---Rx------[ ] > ---GND----o > > Looking at the schematics I see that is already being done. I do however see a lot of gaps between GND tracks. Especially on the blue layer.
Too bad the HDMI pads are so close to each other otherwise you could have had a GND track run between them fully enclosing the HS pads. To the left I see that all HDMI tracks are routed trough some chips. What are those? Magnetics, impedance matchers? I mention that because on the blue tracks the'res a log of extra track for matching track length. maybe that should that be done before those chips. Also the pads are shortened. I hope that's on purpose. > > _______________________________________________ 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