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@lkcl.net wrote:
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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