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DisplayPort over USB type C

Posted by Terry Moore
Terry Moore
 
User is currently offline
on Monday, 22 September 2014
in USB 3

I attended the USB 3.1 developer's conference last week in Seattle; but the big news about type C didn't come out until today. 

The VESA press release is here: http://www.vesa.org/news/vesa-brings-displayport-to-new-usb-type-c-connector/.

Interesting points:

  1. This wasn’t mentioned during the USB 3.1 Developer Days last week (not even hinted at)
  2. This may have a dampening effect on display-over-USB technologies such as DisplayLink or the USB AV class
  3. This will compete directly with technologies like MHL, DiiVA, and micro HDMI
  4. The press release is confusing. Today, USB 3.1 (gen1 and gen2 in the new lingo, SuperSpeed and SuperSpeed Plus in the old lingo) can use exactly two lanes (one for TX, one for RX). Support for four lanes is "future". So DisplayPort can readily use the extra two lanes with no effect on existing deployment
  5. DisplayPort over type C does conflict with a use case shown for docking stations last week, using type C, in which PCIe Gen2 was run over the spare two pairs of wires.
  6. So far I see no announcements of silicon support, which is unusual when a new technology specification is announced.

Until Intel, Qualcomm or MediaTek provide support in their system chips, or a third party announces a mux chip, this won't show up in real systems. Silicon support is the key. Watch for responses from Silicon Image and DisplayLink.

(Although this is all over the web, I found this thanks to Tom's Hardware, who posted this: http://www.tomshardware.com/news/displayport-alt-mode-superspeed-usb-3.1-video,27731.html)

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