Breaking News
News & Analysis

Will The World Coalesce Around USB Type C?

Piggybacking USB Type C, Lattice pushes superMHL
8/3/2015 09:50 AM EDT
Page 1 / 2 Next >
More Related Links
View Comments: Newest First | Oldest First | Threaded View
User Rank
Re: Corrections
junko.yoshida   8/5/2015 4:40:20 PM
Thanks for chiming in, Bill_Lempesis. Much appreciate it.

Lattice went back and took a look at the DP 1.3 spec and came back with the following comment and came back to us:

Section 1.2.5 of the specification states, "DisplayPort supports equivalent functionality to the feature sets defined in CEA-861-F for transmission of high quality uncompressed audio-video content." The statement made us assume that blanking periods noted within the CEA-861-F specification would apply.

However, after looking into the spec in depth we realized that with a reduced blanking period, an equivalent functionality can be maintained. And with this reduced blanking period, the bandwidth required to transfer 4K video @ 60fps and 4:4:4 video is sufficient to utilize only 2 lanes of DP1.3 signals, which means that concurrent USB3.1 data can be supported. In short, we made a mistake when informing you that DP was at a disadvantage for concurrent USB3.1 data with 4K60 4:4:4 video.

The story is now updated with a new chart on page 1.

Thank you again for your corrections.



User Rank
Bill_Lempesis   8/4/2015 1:59:42 PM
VESA agrees that various gadgets, PCs, and displays will soon be sporting the USB Type-C connector, but there are some factual inaccuracies in this article that need to be corrected.


First, DisplayPort Alt mode, "DisplayPort over USB-C", does support 4K 60fps 4:4:4 24 bit video transport with concurrent USB 3.1. DisplayPort version 1.3 supports one 4K display on two of the available four high-speed lanes, or two 4K displays on all four lanes.  This was disclosed in a VESA press release in Q3 2014 with the announcement of DP1.3 and DisplayPort over USB-C standards releases, which can be found at


Regarding the charging of the battery in the connected video source device (such as a cell phone) through a display connection, all alternate modes have the ability to use the comprehensive USB-C power capabilities,  thus simplifying the system design.


For those who are interested in learning more about DisplayPort over USB-C, you can find additional information on the VESA website at

sw guy
User Rank
Not only MacBook and Chromebook
sw guy   8/4/2015 6:53:58 AM
No need to a long search session to find motherboard and laptop (both from big names) with built-in USB type C connector

Terry Moore
User Rank
Re: fanciful scenario?
Terry Moore   8/3/2015 7:36:45 PM
Fanciful uses: it's already happening, in a tentative way: MirrorLink and Apple CarPlay essentially allow for these kinds of use cases. Type C will only make things better. (And it's really interesting that Apple is an early adopter on Type C.)

As with any "simplifying" technology, system software will have to work even harder to make things simple for the users. That's good for those of us who do do USB system software!

User Rank
fanciful scenario?
junko.yoshida   8/3/2015 1:16:24 PM
I was actually intrigued by this "fanciful scenario" -- an emerging trend of "guest OS" -- laid out by Lattice Semi guy as well as ABI Research analyst. Do you see if it is catching up?

Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed