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US 8,275,919 B2Granted
Device for tapping USB power
AssigneeLantiq Deutschland GmbH
InventorsJia Xiang Shi, Ingo Volkening
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Abstract
A device includes a universal serial bus (USB) port comprising a data terminal and a power terminal to receive power from a remote USB port. The device includes a controller coupled to the data terminal of the USB port to provide a USB initialization signal.
Claims17
A device, comprising:
- a universal serial bus (USB) port comprising a data terminal and a power terminal to receive power from a host USB port;
- and
- a controller coupled to the data terminal of the host USB port to provide a power state signal that determines the power provided by the host USB port from a first state before or during initialization at a lower power and a second state after initialization at a higher power,
- wherein the power state signal is a remote network driver interface specification (RNDIS) signal,
- wherein the controller is configured to determine whether a predefined control signal has been received at the data terminal
- wherein the controller is configured to transmit a message signal to the data terminal when it is determined that the predefined control signal has not been received at the data terminal, and
- wherein the predefined control signal comprises a keep alive message;
- and
- wherein the device is not an RNDIS device, and the controller mimics the functions of an RNDIS device by sending a subset of RNDIS signals to the host port.
6 more elements
A method for a determining a power for a device connectable to a universal serial bus (USB) port, the device including a data terminal and a power terminal to receive power from a host USB port, the method comprising the steps of:
- providing a power state signal that determines the power provided by the host USB port from a first state before or during initialization at a lower power and a second state after initialization at a higher power,
- wherein the power state signal is a remote network driver interface specification (RNDIS) signal,
- determining whether a predefined control signal has been received at the data terminal,
- transmitting a message signal to the data terminal when it is determined that the predefined control signal has not been received at the data terminal, and
- wherein the predefined control signal comprises a keep alive message;
- and
- wherein the device is not an RNDIS device, and the controller mimics the functions of an RNDIS device by sending a subset of RNDIS signals to the host port.
4 more elements
Dependencies are inferred from the claim text.