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

Luke Kenneth Casson Leighton lkcl at lkcl.net
Wed Aug 9 10:34:54 BST 2017

okaay, so this is what i've managed for the outgoing vias (layer 1),
the two lengths are equal (to each other and including across all four
pairs) and the relative positions of each via are identical.

for layer 6.... faak it's tight on space down the bottom, so i simply
can't get anything but "turns" in.   it'll have to go dead-straight
until the other end of the board, after the PMIC, where i'll then be
able to correct the length differences between the CLK pair and the
other pairs.

richard you said that the difference between all pairs should be no
more than 100mil, right?  but that clock should be a leetle bit

CLK-pairs are 57.245 (i got them to within a thousandth of a mm!
57.245 and 57.24518 how jammy is that!!)

HX2N/P are 49.something - a hell of a big difference.  luckily that
one's on the outside edge so i can "wiggle" it a lot :)

oh... i had another go at the USB pairs, after reading all that you
recommended i wasn't happy that there was skew (which i never noticed
before).  the USB lines worked but there would have been quite a bit
of EM.


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