Universal Serial Bus: Difference between revisions

→‎Functions: Add SuperSpeed
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(→‎Introduction: Remove comment about OHCI/EHCI/XHCI/UHCI all needing to be implemented; modern hardware with XHCI only needs an XHCI driver)
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All functions understand the USB protocol, respond to standard operations (e.g, configuration or reset), and describe capabilities to the USB host.
 
There are threefour speed classes of functions:
* '''Super-speed''' functions operate at up to 5 Gb/s.
* '''High-speed''' functions operate at up to 480 Mb/s.
* '''Full-speed''' functions operate at up to 12 Mb/s.
* '''Low-speed''' functions operate at up to 1.5 Mb/s.
 
The original USB specification defined low- and full-speed devices, while USB 2.0 added high-speed devices. and USB 3.0 will add a fourth transferadded super-speed of up to 5 Gb/s, called SuperSpeeddevices.
 
===== Hubs =====
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