Usb-if announces new USB4 2.0 specification to achieve USB 80GBps performance

Usb-if officially announced the USB4 2.0 specification, which will increase the transmission speed to USB 80Gbps, doubling the maximum bandwidth compared to the current USB4. USB also updates the USB Type-C interface and USB Power Delivery (USB PD) charging specification. In addition, the external identification mark, as mentioned in the previous developer specification, will be simplified to display the transmission speed and power supply, and will no longer mark the USB version.

Usb-if indicates that the USB4 is based on a multi-protocol channel (note: the current USB4 is based on the Thunderbolt PHY physical layer contributed by Intel), making the architecture very different from USB 3.2 and USB 2.0.

The USB4 2.0 logo will dilute the version number, and the new logo will focus on transmission rate and power supply

Thanks to the USB4 2.0 specification, the current 40Gbps USB Type-C passive cable and the newly defined 80GBps USB Type-C cable use a new physical layer architecture based on PAM3 signal coding to achieve 80Gbps transmission speeds. In addition, selective transmission speed asymmetries are provided, such as 40Gbps on one side and 120Gbps on the other when connected to the display.

In addition, the USB data architecture uses an enhanced line-high speed USB data channel to deliver over 20Gbps transfer performance while maintaining compatibility with the upcoming DisplayPort 2.1 and PCIe 4.0, as well as compatibility with previous USB versions.