Super Speed Plus USB

Super Speed Plus Universal Serial Bus (USB) was first introduced in 2013 with the release of the USB 3.1 specification. This version features the introduction of a 10 Gbit/s transfer speed. To avoid confusion and begin a new naming convention, in 2015 USB 3.1 was named USB 3.1 Gen 2 and USB 3.0 was renamed USB 3.1 Gen 1.

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Super Speed Plus USB significant features

  • Speeds of up to 10 Gbit/sec are supported
  • Backwardly compatible with all speeds defined in USB 2.0
  • New, and slightly larger connectors are used for Super Speed Plus USB than are used with USB 2.0. The Hub receptacles receiving these connectors can also accept the standard 2.0 connectors.
  • Implements 128b/132b encoding in a full-duplex communications mode.

Data Signals

Super Speed Plus USB uses 6 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

Super Speed Plus Power Distribution

USB 3.1 Gen 2 provides for low-power and high-power ports. Both of these ports are able to supply their specified current while maintaining 10 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)

Notes

 Learn More

 
Designing USB with Microchip
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USB Speeds and Specifications
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USB Power Delivery
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Type-C
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