Abstract: A USB switching circuit includes a first multiplexer, a second multiplexer coupled with the first multiplexer through transmission paths, and a voltage regulation circuit coupled with the first and second multiplexers. The first multiplexer distributes first data signals to the transmission paths according to first control signals. The second multiplexer distributes a second data signal to the transmission paths according to second control signals. The voltage regulation circuit sets a maximum voltage and a minimum voltage of the first data signals to corresponding to a common voltage. The maximum voltage of the first data signals is not higher than a maximum voltage of the second control signals, or the minimum voltage of the first data signals is not lower than a minimum voltage of the second control signals. The first data signals and the second data signal are generated according to different communication protocols.

Abstract: A USB switching circuit includes a first multiplexer, a second multiplexer coupled with the first multiplexer through transmission paths, and a voltage regulation circuit coupled with the first and second multiplexers. The first multiplexer distributes first data signals to the transmission paths according to first control signals. The second multiplexer distributes a second data signal to the transmission paths according to second control signals. The voltage regulation circuit sets a maximum voltage and a minimum voltage of the first data signals to corresponding to a common voltage. The maximum voltage of the first data signals is not higher than a maximum voltage of the second control signals, or the minimum voltage of the first data signals is not lower than a minimum voltage of the second control signals. The first data signals and the second data signal are generated according to different communication protocols.

Abstract: A transmission interface communicating method used in a display device that includes the steps outlined below is provided. A first status update signal is received from a host device to turn a hot plug detect (HPD) status of the display device to a high status. A HPD signal having a low status is transmitted to the host device in response to the first status update signal. A configuration signal is received from the host device. A configuration acknowledgement signal is transmitted to the host device in response to the configuration signal. The HPD signal having the high status is actively transmitted to the host device.

Abstract: A transmission interface communicating method used in a display device that includes the steps outlined below is provided. A first status update signal is received from a host device to turn a hot plug detect (HPD) status of the display device to a high status. A HPD signal having a low status is transmitted to the host device in response to the first status update signal. A configuration signal is received from the host device. A configuration acknowledgement signal is transmitted to the host device in response to the configuration signal. The HPD signal having the high status is actively transmitted to the host device.

Abstract: A detection device for detecting types of a universal serial bus cable includes a detection circuit and a control unit. The detection circuit includes a signal source, a receiving end, a first resistor, a second resistor, a variable resistor, a first capacitor, a second capacitor, first through fourth switches, a VBUS end, an ID end, and a ground end. The signal source provides a detection signal. The control unit is electrically connected to the detection circuit, and is configured to control the first through the fourth switches according to a plurality of on-off states, to receive the detection signal and a VBUS signal from the receiving end in the plurality of on-off states, to generate a plurality of detection results, and to determine the type of the USB cable according to the plurality of detection results.

Abstract: Disclosed is a device and method for detecting types of a universal serial bus cable. The detection device includes a detection circuit and a control unit. The detection circuit includes a signal source, a receiving end, a first resistor, a second resistor, a variable resistor, a first capacitor, a second capacitor, first through fourth switches, a VBUS end, an ID end, and a ground end. The signal source provides a detection signal. The control unit is electrically connected to the detection circuit, and is configured to control the first through the fourth switches according to a plurality of on-off states, to receive the detection signal and a VBUS signal from the receiving end in the plurality of on-off states, to generate a plurality of detection results, and to determine the type of the USB cable according to the plurality of detection results.