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

Luke Kenneth Casson Leighton lkcl at lkcl.net
Sat Dec 16 09:39:15 GMT 2017

okay!  so i've just done a new update which outlines a rather (vague)
summary of the taper, there's another update to go out before that,
which is nearly there: in the meantime i'm making good progress with
the program that reads the ASCII PADS format, displays the tracks (so
i can see quickly what's going on), and alters the tracks to create
the taper.

attached is like the first version, it requires several adjustments
(all of which will be done programmatically).

btw richard: as it's done programmatically this *could* actually use a
*much* more accurate algorithm, and a lot more steps.

the steps have to be offset though.  they *must* not all be on the
same 45 degree line, because if they did then the inter-pair spacing
would drop below 5mil, and when they got close to 5 mil separation the
*intra*-pair spacing would drop below 5mil.  so everything needs to be
shuffled up in a cascade that relates (weirdly) to *half* of 45
degrees - 22.5

also it would appear that the horizontal tracks, i turned NE by 45
degrees a little bit too early (i did the tracks by eye) so i have to
alter that...

it's klunky but it's getting there.

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