Marvellworld Trade Ltd.

Marvell International Limited

Yong Jiang

Zhenyu Zhang

Frank Huang

Yui Lin

James Kang-Wuu Jan

Lite Lo

Kevin Lo

USB self-idling techniques are described. In one or more embodiments, a Universal Serial Bus (USB) device comprises one or more modules to communicate via USB and self-idle by presenting an idle mode to a USB host and entering a suspend mode after the idle mode, the suspend mode being entered while the USB host is presented with the idle mode.

USB self-idling techniques

USB self-idling techniques are described. In one or more embodiments, a Universal Serial Bus (USB) device comprises one or more modules to communicate via USB and self-idle by presenting an idle mode to a USB host and entering a suspend mode while the USB host is presented with the idle mode.

An apparatus includes a Universal Serial Bus (USB) transceiver of a USB host controller, a first pull-down resistor, a first switch, a second pull-down resistor, a second switch, and a detachment module. The USB transceiver has a differential output. The first switch electrically couples the first pull-down resistor to a positive terminal of the differential output in response to a first switch control signal. The second switch electrically couples the second pull-down resistor to a negative terminal of the differential output in response to a second switch control signal. The detachment module selectively determines whether a USB device is electrically coupled to the differential output by checking a voltage at the differential output while at least one of the first switch control signal or the second switch control signal is asserted. The detachment module determines whether the USB device is electrically coupled to the differential output by checking the positive terminal when the USB transceiver is in a full-speed idle state and by checking the negative terminal when the USB transceiver is in a low-speed idle state.

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San Jose, CA, United States of America

Yong Jiang