[Arm-netbook] HDMI High-Frequency Layout: Recommendations

[Luke Kenneth Casson Leighton]

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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Mon, Oct 2, 2017 at 5:01 AM, Richard Wilbur <richard.wilbur at gmail.com> wrote:
> Be careful in the wiggles if you make a high-frequency trace turn
> parallel to itself that those parallel sections are at least separated
> by a distance of 4*trace width=20mil.

 yyehhh it's a bitch doing these by hand.

> I painted the likely problematic edges with red and circled in green
> the wiggle you created with a geometry that completely avoids the
> problem.

 yehyeh thank you for that, makes it really clear.  the thing is
there's really not a lot of space, in which we need to get rid of
about...  i think it's something like almost 0.8mm length discrepancy:
difference between two BGA pads *and* the right-angle turn.  the
toradex-recommended wiggle method is fine for compensating for a
single 45 degree turn (found that out a few weeks back, now) but for
the amount of length discrepancy here it would be something like...
maybe... eight or nine toradex-style wiggles.

 i'll see how it looks.

l.