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The USB developer forum (USB-IF), the support organization for the advancement and adoption of USB technology, announced today the release of USB4 specification, a Major update intended to provide the next generation USB architecture that complements and builds on the existing USB 3.2 and USB 2.0 architectures.
The USB4 architecture is based on the specification of the Thunderbolt ™ protocol recently provided by Intel Corporation to the USB Promoter Group. It doubles the overall maximum bandwidth of the USB and allows multiple simultaneous display and data protocols.
The main features of the USB4 solution are:
- Two-way operation with existing Type-C® USB cables and up to 40 Gbps operation on 40 Gbps certified cables
- Multiple data and display protocols that effectively share maximum aggregated bandwidth
- Backward compatible with USB 3.2, USB 2.0 and Thunderbolt 3
Since the USB Type C connector has become the external display port for many host products, the USB4 specification provides the host with the ability to optimally resize allocations for the data flow of the host. 39; display. Although the USB4 specification introduces a new underlying protocol, compatibility with existing USB 3.2, USB 2.0, and Thunderbolt 3 hosts and devices is supported. the resulting connection adapts to the best mutual ability of the connected devices.
| Speed | 2008 | 2013 | 2017 | 2019 |
|---|---|---|---|---|
| 5 Gb / s | USB 3.0 | USB 3.1 Gen 1 | USB 3.2 Gen 1 | USB 3.2 Gen 1 |
| 10 Gb / s | USB 3.1 Gen 2 | USB 3.2 Gen 2 | USB 3.2 Gen 2 | |
| 20 Gb / s | USB 3.2 Gen 2×2 | USB4 Gen 2×2 | ||
| 40 Gb / s | USB4 Gen 3×2 |
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