On Feb 5, 2017, 15:06, at 15:06, Julius Lehmann <[email protected]> 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. > >Kind regards >Julius Lehmann > >On Feb 5, 2017, 14:20, at 14:20, Luke Kenneth Casson Leighton ><[email protected]> wrote: >>--- >>crowd-funded eco-conscious hardware: >https://www.crowdsupply.com/eoma68 >> >> >>On Sun, Feb 5, 2017 at 11:44 AM, Internet <[email protected]> wrote: >>> Hey there! >>> >>> I was wondering about the USB3.1 pinout in the EOMA68 standard. In >my >>> research on the USB Type C connector I found out that USB3.1 >>> (Superspeed+) has only two differential signal pairs (one for >>receiving, >>> one for transmitting) >> >>http://pinoutguide.com/Slots/usb-type-c_pinout.shtml >> >>two for receiving, two for transmitting, each 5gbit/s for a total of >>10gb/sec. the connector and thus the pinouts are rotatable by 180 >>degrees so the pinouts on the first 12 pins (top row) are *identical* >>layout to the second 12 pins (bottom row) except in the reverse order. >>D+ and D- (the USB2 pins) are *missing* on one row of the receptacle >>so that you don't connect them up twice (which would be bad). >> >>you *may* be thinking of USB 3.0 which is connector-compatible with >>USB 2.0 and is what you find on most laptops and desktop computers >>these days: >> >>http://pinoutguide.com/Slots/usb_3_0_connector_pinout.shtml >> >>that is *only* one set of (5gbit/sec) tx-rx differential pairs. >> >>scared me for a minute that i'd messed it up... :) >> >>l. >> >>_______________________________________________ >>arm-netbook mailing list [email protected] >>http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook >>Send large attachments to [email protected]
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