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

[Richard Wilbur]

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.

> On Tue, Aug 22, 2017 at 4:30 PM, Richard Wilbur <richard.wilbur at gmail.com> wrote:
>> Regarding SD0:  To what interface does it belong?  What is the maximum data rate on this line?
> 
> 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.  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?)