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

Luke Kenneth Casson Leighton lkcl at lkcl.net
Wed Aug 23 20:09:59 BST 2017

On Wed, Aug 23, 2017 at 8:04 PM, Richard Wilbur
<richard.wilbur at gmail.com> wrote:
> On Aug 22, 2017, at 10:09, Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:
>> SATA was on a very preliminary version of EOMA68.  it was cut a long time ago.
> Sorry for bringing up old news.

 ey no problem it's all interesting stuff

>> MicroSD card reading (and other SD/MMC / SDIO compatible interfaces).
>> i *think* it's a max datarate of 50mhz....
> Sounds like SD0 is high-frequency single-ended
> so it might warrant a ground shield trace--if there's room.

 there is... just!

> But I would rather maintain the 15mil differential pair trace to any
> other trace spacing because I'm guessing the coupling to
> differential pairs will be small.  (It is not parallel to differential
> signals for a significant distance, is it?)

 nono - they run round the back of the vias (attached) - yellow, 6 lines.

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