[Arm-netbook] HDMI High-Frequency Layout: Recommendations Vias Moveable?

Luke Kenneth Casson Leighton lkcl at lkcl.net
Thu Nov 23 03:47:43 GMT 2017


On Wed, Nov 22, 2017 at 6:56 PM, Richard Wilbur
<richard.wilbur at gmail.com> wrote:

> If they are grounding power capacitors, don't move them unless you
> can do so while maintaining (or better yet shrinking) the distance
> from capacitor pad to via.  Low impedance power is precious!

 ok :)

>> also i just noticed that TX1N/P has that little kink, it turns 45
>> degrees anti-clockwise (from the long horizontal straight) about 15mil
>> late, and i really don't know why :)
>
> It seems you decided to split up the extra width needed to accommodate
> the ground vias between TX0 and the clock lines across all the Northeast
> bends and then move TX1 and TX0 to avoid running into the ground vias.

 something like that... yeah.  i've been experimenting with x11
settings recently so haven't fired up PADS in a while (as X11 crashes
terminate the QEMU VM with prejudice, which is bad).  i remember that
the priority was to get the layer-changing points to be running
east-west, because in previous iterations having them run NE<->SW was
a disaster.  that in turn had knock-on effects back down the line..

l.



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