| 摘要 |
A universal serial bus transceiver is disclosed. In one embodiment, the transceiver includes a differential transmitting amplifier with a first input terminal that receives a reference voltage, a second input terminal that receives a first data input signal at a level corresponding to the reference voltage, and a third input terminal that receives a second data input signal at the reference voltage level. The differential transmitting amplifier generates first and second bus data output signal at the bus signal level in response to the first and second data input signals. The transceiver also includes a first receiving amplifier with a first input terminal that receives the reference voltage and a second input terminal that receives a first bus data input signal at the bus signal level. The first receiving amplifier generates a first data output signal at the reference voltage level. Similarly, the transceiver includes a second receiving amplifier with a first input terminal that receives the reference voltage and a second input terminal that receives a second bus data input signal at the bus signal level. The second receiving amplifier generates a second data output signal at the reference voltage level. The disclosed transceiver may reside on a separate chip from the USB controller, eliminating the need for the USB controller to support the universal serial bus signal level. Moreover, the disclosed generic USB transceiver is compatible with a variety of USB controllers utilizing different internal signal levels.
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