On Tue, Aug 22, 2017 at 4:30 PM, Richard Wilbur
<richard.wil...@gmail.com> wrote:

> Layer 3 always has ground separation from layer 1 in the intervening ground 
> plane on layer 2 and likewise from layer 6 by layers 4 and 5.  So I'm not 
> worried about those signals.

 ok great.

> Regarding the SATA power:  Is it an important part of providing a SATA 
> interface?  If so, I would suggest not limiting our options on this card.  My 
> understanding is that SATA is significantly more efficient for harddisk data 
> interface than USB.

 SATA was on a very preliminary version of EOMA68.  it was cut a long time ago.

> 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....

l.

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