[Arm-netbook] USB3.1 pinout

Internet internet at devpi.de
Mon Feb 6 05:57:43 GMT 2017

I'm glad to hear the standrd itself is correct. The only thing I would still like to know is the mapping of the two USB ports. So, which superspeed wires correspond to which usb 2.0 wires?

Julius Lehmann

On Feb 5, 2017, 22:52, at 22:52, Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:
>crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>On Sun, Feb 5, 2017 at 9:30 PM, Internet <internet at devpi.de> wrote:
>> Regarding USB C you are right that there are four differential pairs
>>> the connector. However, for communication only two pairs are used
>>> the USB 3.1 protocol only uses two. On the device that has a USB C
>>> connector you need a dedicated controller that manages the
>orientation of
>>> the plug. Then the two data lines are connected to the right pins on
>>> connector through a multiplexer. The other two pairs on the
>connector are
>>> for no use in USB mode but if you want to use USB C in alternate
>mode (e.g.
>>> DisplayPort), signals can be rerouted.
>>> You can find all the information on usb.org
>>> (zip archive with full specification).
>>> This basically means that the EOMA68 standard has two differential
>>> that are not used for USB but if your intention was to make it
>>> for USB C, an internal multiplexer would be needed.
> argh!  no, it was a misunderstanding.  ha.  very funny.  it means i
>accidentally made room for 4 extra wires... which could be used to
>the *second* USB port to USB3.1 as well.
>that's frickin hilarious.
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