Usb peripheral and method of reducing transmission power thereof
AssigneePostech Academy-Industry Foundation
InventorsHong June Park, Ki Hwan Sung
Life of this patent
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Abstract
Disclosed are a USB peripheral apparatus capable of reducing transmission power of a transmission terminal circuit by significantly increasing resistance values of terminations provided at the transmission terminal circuit and a reception terminal circuit as compared with a specific impedance value of a transmission line, and a transmission power reduction method thereof.
Claims13
A USB peripheral apparatus comprising:
- a transmission unit that transmits input data to an already connected external USB host apparatus when an operation mode of the USB peripheral apparatus is a transmission mode;
- a reception unit that receives data from the USB peripheral host when the USB peripheral apparatus is in a reception mode;
- a termination resistor unit that has a first resistance value and is connected to the transmission unit and the reception unit;
- and
- a control unit that detects whether the operation mode of the USB peripheral apparatus is one of the transmission mode and the reception mode, and controls the first resistance value of the termination resistor unit to be changed to a second resistance value corresponding to the detected operation mode.
A transmission power reduction method of a USB peripheral apparatus connected to a USB host apparatus and transmits/receives data to/from the USB host apparatus, comprising the steps of:
- detecting whether an operation mode of the USB peripheral apparatus is one of a transmission mode and a reception mode;
- changing an initial first resistance value of a termination resistor unit connected to a transmission unit of the USB peripheral apparatus to a second resistance value that is twice or more as large as the first resistance value when the USB peripheral apparatus is in the transmission mode as a result of the detection;
- transmitting data, which is inputted after the first resistance value is changed to the second resistance value, to the USB host apparatus;
- and
- changing the changed second resistance value to the first resistance value when the USB peripheral apparatus is in the reception mode as the result of the detection.
The transmission power reduction method of a USB peripheral apparatus according to claim 10, wherein the USB peripheral apparatus is a high speed USB peripheral apparatus of a USB 2.0 standard of 480 Mbps or more.
Dependencies are inferred from the claim text.