--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Fri, Jan 5, 2018 at 8:25 AM, Richard Wilbur <[email protected]> wrote: > On Fri, Jan 5, 2018 at 12:44 AM, Luke Kenneth Casson Leighton > <[email protected]> wrote: >> On Fri, Jan 5, 2018 at 7:32 AM, Richard Wilbur <[email protected]> >> wrote: >>> Any >>> chance we could use another trace to even up the little dimples that >>> are left in the edge facing the differential pairs? >> >> always best to screenshot / arrow-mark it, richard. round-trip >> delays getting critical here, we're up to 5th january already. > > I have attached a screenshot with red arrows. It is taken from the > long straight differential microstrip transmission lines on layer 6. > These are otherwise so clean and straight. gooot it. yehyeh there's signals (3V3) and stuff close by (unavoidably), and i have to put manual GND tracks in because the flood-fill won't blotch in to spaces narrower than 10mil... it's a setting somewhere and i kinda prefer it that way, otherwise flood-fill tends to get into some really small spaces and creates awkward-looking tiny shapes. >> attached green arrows, i am guessing you mean, i remember you said >> that causes... something-or-other... capacitance-related? > > The ones you marked weren't the ones I was looking at. I think they > are probably fine as they aren't too sharp, they mind the 15mil > clearance, and we are turning 90 degrees out of some signal vias onto > the top of the board. (If they were pointing at a straight side I'd > be more worried.) with you. >> there's a few more like that back at the source diff-pair vias, i'll >> think about whether to drop a plain square keepout in place (to >> preserve 15mil) or a straight manual track. track would cut clearance >> to around 12mil. thoughts? > > It is kind of tumultuous with the pairs coming from close quarters on > layer 1 and still to be sorted through the intra-pair > skew-compensating wiggles. What you've done at that end looks much > better. yay :) >>> I glanced at parts of the rest of the board but it would be much more >>> straightforward with the schematics. >> >> not so concerned about the rest of the board, it's mainly the HDMI. >> PDF version of schematics should be here >> http://hands.com/~lkcl/eoma/DS113-V2.7-2017-02-17.pdf > > I'll concentrate on the HDMI, then. yes please l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
