{"id":4680,"date":"2019-03-04T11:32:07","date_gmt":"2019-03-04T16:32:07","guid":{"rendered":"http:\/\/pappp.net\/?guid=abc4252d6f2555dfdedca8843d33158b"},"modified":"2019-03-04T11:32:07","modified_gmt":"2019-03-04T16:32:07","slug":"thunderbolt-3-becomes-usb4-as-intels-interconnect-goes-royalty-free","status":"publish","type":"post","link":"https:\/\/pappp.net\/?p=4680","title":{"rendered":"Thunderbolt 3 becomes USB4, as Intel’s interconnect goes royalty-free"},"content":{"rendered":"

Source: Ars Technica<\/a><\/p>\n

Article note: While Intel going royalty-free on their interconnect is useful, none of the articles I've seen are discussing the security implications. Thunderbolt supports DMA (and other lower-level access) that USB doesn't, and there have been a variety of exploits in the wild for like 5 years at this point (see Thunderstrike & co.). \r\nUSB is a relatively low-privilege connection, making the power socket, cheap peripheral connector, and other throwaway connections able to surreptitiously ask to root around the host system's memory seems like a questionable feature.<\/div>
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Enlarge<\/a> \/<\/span> A very dramatic-looking Thunderbolt 3 cable. <\/p> <\/figure>

<\/a><\/div>\n\n

Fulfilling its 2017 promise to make Thunderbolt 3 royalty-free<\/a>, Intel has given the specification<\/a> for its high-speed interconnect to the USB Implementers Forum (USB-IF), the industry group that develops the USB specification. The USB-IF has taken the spec and will use it to form the basis of USB4<\/a>, the next iteration of USB following USB 3.2<\/a>.<\/p>\n

Thunderbolt 3 not only doubles the bandwidth of USB 3.2 Gen 2×2<\/a>, going from 20Gb\/s to 40Gb\/s, it also enables the use of multiple data and display protocols simultaneously. We would expect the USB4 specification to be essentially a superset of the Thunderbolt 3 and USB 3.2 specifications, thus incorporating both the traditional USB family of protocols (up to and including the USB 3.2 Gen 2×2) and the Thunderbolt 3 protocol in a single document. Down the line, this should translate into USB4 controllers that support the whole range of speeds.<\/p>\n

Intel has previously announced that its Ice Lake platform, due to ship later this year<\/a>, will integrate both Thunderbolt 3 and USB 3.1 Gen 2 (aka USB 3.2 Gen 2) controllers. Currently, offering Thunderbolt 3 requires the use of an additional chip, one of Intel's Alpine Ridge or Titan Ridge Thunderbolt 3 controllers. Integration into the platform means that system-builders no longer need to choose whether or not to include the extra chip; the capability will be built in, and as such, we'd expect to see it become nearly universal.<\/p>\n<\/div>

Read 1 remaining paragraphs<\/a> | Comments<\/a><\/p>

\n<\/a> <\/a> <\/a> <\/a>\n<\/div>","protected":false},"excerpt":{"rendered":"

Enlarge \/ A very dramatic-looking Thunderbolt 3 cable. <\/p>\n

Fulfilling its 2017 promise to make Thu…<\/p>\n

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