This USB 4.0 updated technical specification extends USB4 speed and data protocol performance, enabling manufacturers to develop products that can deliver USB 80Gbps in addition to existing USB 40Gbps and USB 20Gbps to end users.
Key characteristics of the updated USB 80Gbps solution include:
• Up to 80Gbps operation, utilizing a new physical layer architecture based on PAM3 signal encoding, over existing 40Gbps USB Type-C passive cables and newly defined 80Gbps USB Type-C active cables.
•Optionally for certain applications, such as driving very-high performance USB4-based displays, the USB Type-C signal interface can be configured asymmetrically to deliver up to 120Gbps in one direction while retaining 40Gbps in the other direction.
• Updates to data and display protocols to better use the increase in available bandwidth o USB data architecture updates now enable Enhanced SuperSpeed USB data tunneling to exceed 20Gbps. o Aligns with DisplayPort™ Revision 2.1 and PCI Express® Revision 4.
• Backward compatibility with all previous versions of USB.
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