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System and Method for Enumerating a USB Device Using Low Power

  • US 20080126594A1
  • Filed: 08/17/2006
  • Published: 05/29/2008
  • Est. Priority Date: 08/17/2006
  • Status: Active Grant
First Claim
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1. A USB device, comprising:

  • a battery;

    at least one port, coupled to the battery, wherein the at least one port is operable to couple to a host USB device which is operable to charge the battery, where the at least one port is operable to receive an enumeration request from the host USB device; and

    detection logic coupled to the battery and operable to detect a charge state of the battery, wherein the detection logic is operable to enable the USB device to engage in USB device enumeration in response to the enumeration request if the charge state of the battery is sufficient to engage in the USB device enumeration; and

    first circuitry coupled to the detection logic, wherein the first circuitry is operable to engage in low-power enumeration of the USB device if the charge state of the battery is not sufficient to engage in USB device enumeration, wherein the first circuitry is operable to use power received from the host USB device in performing the low-power enumeration.

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