[Arm-netbook] USB3.1 pinout

Luke Kenneth Casson Leighton lkcl at lkcl.net
Sun Feb 5 21:50:18 GMT 2017

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 on
>> the connector. However, for communication only two pairs are used because
>> 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 the
>> 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
>> <http://t224.mjt.lu/lnk/AEUAHWykN94AAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYl5lfeaEfW2hMTR63ZGLMHX5RrAAGAjk/1/ZviPu0ichkU-Gm4llF2oBw/aHR0cDovL3VzYi5vcmc>
>> (zip archive with full specification).
>> This basically means that the EOMA68 standard has two differential pairs
>> that are not used for USB but if your intention was to make it available
>> 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 upgrade
the *second* USB port to USB3.1 as well.

that's frickin hilarious.

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