USB4 by itself does not provide any generic data transfer mechanism or device classes like USB 3.x, but serves mostly as a way to tunnel other protocols like USB 3.2, DisplayPort, and optionally PCIe. Some of the key areas to achieve this are using a single USB-C connector type, while retaining compatibility with existing USB and Thunderbolt products. Goals stated in the USB4 specification are increasing bandwidth, helping to converge the USB-C connector ecosystem, and "minimize end-user confusion". Contributors Īt time of publication of version 1.0, promoter companies having employees that participated in the USB4 Specification technical work group were: Apple Inc., Hewlett-Packard, Intel, Microsoft, Renesas Electronics, STMicroelectronics, and Texas Instruments. On 1 September 2022, the USB Promoter Group announced the pending release of the USB4 Version 2.0 specification, and the specification was subsequently released on 18 October 2022. Specifications USB4 specification History 1.0, some sources write "USB 4", claiming "to reflect the way readers search". Several news reports before the release of that version use the terminology "USB 4.0" and "USB 4". The USB4 specification version 1.0, released 29 August 2019, uses "Universal Serial Bus 4" and specifically "USB4", that is the short name branding is deliberately without a separating space versus the prior versions. The USB4 2.0 specification was released on October 18, 2022, by the USB Implementers Forum, delivering 80 Gbits/s and even 120 Gbit/s in asymmetric mode. On the other hand, support for USB4 is required in Thunderbolt 4. Support of interoperability with Thunderbolt 3 products is optional for USB4 hosts and USB4 peripheral devices, and is required for USB4 hubs on their downward facing ports and for USB4-based docks on their downward and upward facing ports. In contrast to USB 3.2, it allows tunneling of DisplayPort and PCI Express. USB4 products must support 20 Gbit/s throughput and can support 40 Gbit/s throughput, but due to tunneling even nominal 20 Gbit/s can result in higher effective data rates in USB4, compared to USB 3.2, when sending mixed data. In contrast to prior USB protocol standards, USB4 mandates the exclusive use of the Type-C connector, and mandates the use of USB PD for power delivery. The USB4 architecture can share a single high-speed link with multiple end-device types dynamically, best serving each transfer by data type and application. The USB4 protocol is based on the Thunderbolt 3 protocol the Thunderbolt 3 specification was donated to the USB-IF by Intel. USB4 (aka: USB 4.0) is a specification by the USB Implementers Forum (USB-IF), which was released in version 1.0 on 29 August 2019. 0.5 0.5 0.5]/Type/Annot/AP>endobj85 0 objendobj88 0 obj/ProcSet>/Type/XObject/BBox/FormType 1>streamĮndstreamendobj82 0 objendobj83 0 objendobj1 0 objendobj7 0 objendobj11 0 objendobj18 0 objendobj24 0 objendobj29 0 objendobj31 0 objstream
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