SuperSpeed USB

SuperSpeed Universal Serial Bus (USB) was first introduced in 2008 with the release of the USB 3.0 specification. In 2015, USB 3.0 was renamed USB 3.1 Gen 1 to avoid confusion.

Super Speed USB significant features

  • Speeds of up to 5 Gbit/s are supported
  • Backwardly compatible with all speeds defined in USB 2.0
  • New and slightly larger connectors are used for SuperSpeed USB than are used with USB 2.0. The Hub receptacles receiving these connectors can also accept the standard 2.0 connectors.
  • Implements 8 b/10 b encoding in a Full-Duplex Communications mode.

Data Signals

SuperSpeed USB uses six data lines configured in two groups:

  • D+ and D- differential half-duplex signals
  • Two pairs of full-duplex differential signals ( SSTX-, SSTX+, and SSRX-, SSRX+)
Pin Number Signal Description
1 VBUS Power
2, 3 D- , D+ 2.0 Differential Pair
4 GND Ground
5, 6 SSRX- , SSRX+ Super Speed receiver differential pair
7 GND_DRAIN Ground for return signal
8, 9 SSTX- , SSTX+ Super Speed transmit differential pair

SuperSpeed Power Distribution

USB 3.0 provides for low-power and high-power ports. Both of these ports are able to supply their specified current while maintaining 5 Gbit/s transfers.

  • Low-power ports provide up to 150 ma
  • High-power ports provide up to 900 ma

There are several power delivery specifications cable of supplying additional power. Not all modes can sustain the data transfer while supplying power (see the power delivery specifications for details).


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