Electronic devices with multi-connectors and methods thereof

A transmission control device for controlling a data access device comprising:

• a host interface, comprising a first communication channel and a second communication channel, wherein the first communication channel is electrically connected to a first connection interface and the second communication channel is electrically connected to a second connection interface, wherein the first connection interface and the second connection interface are electrically connected to at least one host system;
• a device interface, configured to be electrically connected to the data access device;
• and
• a data-management circuit, electrically connected to the host interface and the device interface, wherein a channel-detecting device detects impedance information between one or both of the first connection interface and the second connection interface and the at least one host system, wherein the data-management circuit determines a connection state according to the impedance information and provides corresponding operation functions for the at least one host system according to the connection state, wherein the connection state indicates whether one or both of the first connection interface and the second connection interface is electrically connected to the at least one host system, wherein the first communication channel comprises a first transmitting channel and a first receiving channel, and the second communication channel comprises a second transmitting channel and a second receiving channel, wherein the channel-detecting device generates an impedance signal according to at least one voltage variation generated by at least one terminal impedance of the at least one host system electrically connected to the first connection interface and the second connection interface, and the transmission control device determines the connection state according to the impedance signal, wherein the channel-detecting device generates the impedance information according to at least one impedance value of the at least one host system electrically connected to one or both of the first connection interface and the second connection interface, wherein, when the at least one host system is electrically connected to the first communication channel or the second communication channel, the first transmission channel or the second communication channel is electrically connected to at least one receiving channel of the at least one host system through a coupling capacitor, wherein the channel-detecting device comprises:
• a bias circuit, biasing the first transmission channel or the second transmission channel to a bias voltage;
• a current source, sourcing a current to the first transmitting channel or the second transmitting channel during a predetermined period according to a control signal;
• a comparator, comparing the bias voltage with a middle voltage to generate a comparison signal;
• and
• a latch circuit, latching the comparison signal as the impedance signal once the predetermined period ends, wherein the transmission control device determines the connection state according to the impedance signal;
• wherein, when the first transmitting channel or the second transmitting channel is electrically connected to the terminal impedance of the at least one host system, the bias voltage is charged by the current to exceed the middle voltage, wherein, when the first transmitting channel or the second transmitting channel is not electrically connected to the terminal impedance of the at least one host system, the bias voltage does not exceed the middle voltage during the predetermined period.

A control method for controlling an electronic device, wherein the electronic device comprises a first connection interface, a second connection interface, and a data access device, wherein the first connection interface and the second connection interface are configured to be electrically connected to at least one host system, the control method comprises:

• generating an impedance signal according to at least one voltage variation generated by at least one terminal impedance of the at least one host system electrically connected to one or both of the first connection interface and the second connection interface, wherein the first connection interface is electrically connected to a first communication channel, and the second connection interface is electrically connected to a second communication channel, wherein the first communication channel comprises a first transmitting channel and a first receiving channel, and the second communication channel comprises a second transmitting channel and a second receiving channel, wherein, when the at least one host system is electrically connected to the first communication channel or the second communication channel, the first transmission channel or the second communication channel is electrically connected to at least one receiving channel of the at least one host system through a coupling capacitor, wherein the step of generating the impedance signal according to the at least one voltage variation generated by the at least one terminal impedance of the at least one host system electrically connected to one or both of the first connection interface and the second connection interface further comprises:
• biasing the first transmission channel or the second transmission channel to a bias voltage;
• sourcing a current to the first transmitting channel or the second transmitting channel during a predetermined period according to a control signal;
• comparing the bias voltage with a middle voltage to generate a comparison signal;
• and
• latching the comparison signal as the impedance signal once the predetermined period ends;
• determining a connection state of one or both of the first connection interface and the second connection interface and the at least one host system according to the impedance signal, wherein the connection state indicates whether one or both of the first connection interface and the second connection interface is electrically connected to the at least one host system, wherein, when the first transmitting channel or the second transmitting channel is electrically connected to the terminal impedance of the at least one host system, the bias voltage is charged by the current to exceed the middle voltage, wherein, when the first transmitting channel or the second transmitting channel is not electrically connected to the terminal impedance of the at least one host system, the bias voltage does not exceed the middle voltage during the predetermined period;
• and
• providing corresponding operation functions for the at least one host system according to the connection state.