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, at 22:52, Luke Kenneth Casson Leighton <lkcl@lkcl.net> wrote:

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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

On Sun, Feb 5, 2017 at 9:30 PM, Internet <internet@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 (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.

l.
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