Method and apparatus of controlling an operational mode of a USB device
OwnerJu-Yung Lininventor
Life of this patent
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Abstract
A method and related hardware for changing operational modes of a Universal Serial Bus (USB) device includes having a detection circuit monitor the connection status of the device port or ports of the USB device. The detection circuit monitors each device port for the presence of a host computer system or a terminator. A control circuit utilizes the output from the detection circuit to determine the correct operational mode for the USB device. The control circuit initiates a USB function reset when changing the mode of the device, such that the host computers can detect the new mode.
Claims13
A terminator for a universal serial bus (USB) port, the USB port comprising:
- a D− signal line;
- a D+ signal line;
- and
- a ground line;
- the terminator comprising:
- an electrically non-conductive member adapted for mechanically mating with the USB port;
- and
- at least an electrical contact disposed on a surface of the electrically non-conductive member for electrically tying the D− line or the D+ line to the ground line.
A mode switching method for a universal serial bus (USB) device, the method comprising:
- providing power to the USB device;
- detecting whether the D− line or the D+line of a USB port of the USB device is grounded;
- and
- switching the operational mode of the USB device, the USB device entering into a predefined mode when the D− line or the D+ line of the USB port is grounded.
A mode switching method for a universal serial bus (USB) device, the method comprising:
- providing power to the USB device;
- providing a detection circuit for detecting when a first USB port of the USB device is electrically connected to a first USB host and for detecting when a second USB port of the USB device is electrically connected to a second USB host;
- providing a USB control circuit for setting an operational mode of the USB device according to the detection circuit, the USB control circuit supporting at least a first operational mode and a second operational mode;
- the USB control circuit entering into the first operational mode when the detection circuit determines that the first USB port is electrically connected to the first USB host and the second USB port is not electrically connected to the second USB host;
- and
- the USB control circuit entering into the second operational mode when the detection circuit determines that the first USB port is electrically connected to the first USB host and the second USB port is electrically connected to the second USB host.
Dependencies are inferred from the claim text.