USB : Overview    USB Facts of Life  

Here are some examples of devices that could have more than one Configuration:

  • A device might be able to operate usefully by turning off some of its circuitry (and thus some of its functionality) if the USB controller cannot grant it all the supply current it needs. A device like that could offer a Low Power Configuration and a Full Power Configuration.

  • Another device might offer different Configurations to adjust its functionality according to the amount of USB bandwidth available.

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