USB协议

Low speed: 1.5mbps

Full speed: 12mbps -> USB1.1(NRZI)

High speed: 480mbps -> USB2.0(NRZI)

super speed: 5Gbps -> USB3.0 (8b10b)/USB3.1 Gen1

super speed: 10Gbps -> USB3.1 Gen2 (128b132b)