Just recently, the USB Promoter Group announced the USB4 Version 2.0 standard, which doubles the transmission speed of the previous version of the same protocol to 80 Gbps.
Because of their backward compatibility, the new active 80 Gbps Type-C cables can used with connections supporting USB4 1.0, USB 3.2, USB 2.0, and Thunderbolt 3, and vice versa; older USB-C cables can used with USB4 Version 2.0 ports, but at reduced rates.
For the most benefit from the new protocol, high-performance screens, storage, hubs, and docks can all take part.
An external GPU connected to a laptop with 80 Gbps of bandwidth might provide a gaming experience on par with that of a desktop PC. Even better, the new standard is compatible with the most recent releases of DisplayPort and PCIe.
The USB Developer Days 2022 conference, which takes place on November 1, will have further information regarding the new protocol.
Thunderbolt 3 product compatibility support is recommended but not essential for USB4 hosts and USB4 peripheral devices but necessary for USB4 hubs’ downward-facing ports and for USB4-based docks’ downward and upward-facing ports. On the other hand, Thunderbolt 4 necessitates USB4 capability.
Data Transfer Modes
Instead of providing its own generic data transfer mechanism or device classes like USB 3.x does, USB4 mostly used as a tunneling mechanism for other protocols such as USB 3.2, DisplayPort, and even PCIe.
Host IP networking provides a native Host-to-Host protocol, but only between two hosts. Consequently, only USB 3.2 10 Gbit/s required, but the maximum non-display bandwidth is USB 3.2 20 Gbit/s when the host and device do not enable optional PCIe tunneling.
USB 4’s alternate mode, DisplayPort 2.0, is supported by the standard. DisplayPort 2.0’s bandwidth of up to 80 Gbit/s is comparable to that of USB data, but only in a single direction, allowing for 8K resolution at 60 Hz with HDR10 color.
USB 3.x – 4.x Data Transfer Modes
USB 3.2 Gen 1 is not compatible with USB 4 Gen 2. In reality, they both represent the same speed of 10 Gbit/s but represented in separate electrical layer encodings.
Even though USB4 needed for dual-lane modes, a single-lane link used for initialization and as a fallback in the event of a lane bonding fault.
Thunderbolt compatibility mode increases the data transfer rates of the lanes to 10.3125 Gbit/s ( Gen 2) and 20.625 Gbit/s (for Gen 3), respectively (these called legacy speeds and rounded speeds). Once the 64b/66b encoding gone, they are also uniformly round: 20.625/66*64 = 20,000 Gbit/s.
Thunderbolt 3 Compatibility
The USB4 specification lists “Retain compatibility with existing ecosystem of USB and Thunderbolt products” as one of its design goals. USB4 hubs are required to be Thunderbolt 3 compatible, while USB4 hosts and USB4 peripheral devices choose whether or not to support Thunderbolt 3.
Compatible products must implement 40 Gbit/s modes, at least 15 W of supplied power, and the different clocks, and implementers must sign the license agreement and register a Vendor ID with Intel.
The USB type C shell of USB4 contains 24 pins and is symmetrical. The top row of USB4 comprised of 12 A pins, while the bottom row consists of 12 B pins.
With USB4, you get two lanes of differential SuperSpeed couples. In lane one, you’ll use TX1+, TX1-, RX1+, and RX1-, while in lane two, you’ll use TX2+, TX2-, RX2+, and RX2-. Each lane of USB4’s transfer speed is 20 Gbp/s. Differential D+ and D- for USB 2.0 transport retained in USB4.
The USB protocol assigns the act of entering USB4 operation to the CC configuration channels, in addition to the creation of a relationship between attached ports, detection of plug orientation due to the reversible USB type C shell, discovery of the VBUS power supply pins, and determination of the lane ordering of the SuperSpeed lanes.
The USB Implementers Forum and Intel said at CES 2020 that they plan to approve USB4 devices that offer the same set of extensions as Thunderbolt 4 devices. Tiger Lake processors from Intel were the first to feature USB4 support, and by the end of 2020, we should see a slew of new products that take advantage of the standard.
Apple introduced three new machines to the MacBook Air, MacBook Pro, and Mac Mini product lines on November 10, 2020, to take advantage of the new standard. They have two USB 4.0/TB 4.0 connections and a single controller, making them pioneers in the computer industry.
Zen3+ (Rembrandt) CPUs, AMD said, will have USB4 connectivity. USB 3.2 Gen2x2 is supported, but only in AMD’s Zen 4 processors.
FAQs – People Also Ask
Is usb2 compatible with USB4?
Compatibility With Previous Technology
One of the best features of USB is how well compatible it is with different versions. USB 3.1 Gen 2 and 3 devices and ports are backwards compatible with USB 4.0. Obviously, though, your entire connection will only function at the pace and with the capabilities of its weakest link.
Is USB4 same as USB-C?
When comparing USB4 to USB-C,
Despite the fact that the USB-C connector is standard for USB4, not all USB-C cables or ports are compatible with the USB4 standard. Open in new window/ Just because it has a USB-C connector doesn’t imply you know which USB standard it employs. The USB Implementers Forum is responsible for the upkeep of the current version of USB, known as USB4 (USB-IF).
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