[Arm-netbook] Improv And Operation:Marketing for EMOA-*

[Luke Kenneth Casson Leighton]

On Tue, May 27, 2014 at 9:40 AM, mike.valk at gmail.com
<mike.valk at gmail.com> wrote:
> 2014-05-26 16:10 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
>
>> On Mon, May 26, 2014 at 3:04 PM, mike.valk at gmail.com
>> <mike.valk at gmail.com> wrote:
>>
>> > That means that every USB3, slave, device must accept a USB1/2 link,
>> > from a master,
>>
>>  yyyup.
>>
>> > USB3 requires 5 extra pins
>>
>> 4 coming off the CPU Card.  what's the 5th one?
>
>
> Apparently: GND_DRAIN: Ground for signal return

 ok great.  thanks mike.

> http://en.wikipedia.org/wiki/USB_3.0#Pinouts
>
> Probably it used to "drain" signal leakage from the SuperSpeed cable pairs.
> But how that is to be terminated on the devices properly, I have no idea.
> I'm not sure if it's necessary in the EOMA connector either.

 no, that's my understanding.

l.