Abstract: A control circuit disposed in a connection line including a first power pin and a second power pin and including a native N-type transistor, a first impedance unit, and a second impedance unit is provided. The native N-type transistor includes a first gate, a first drain and a first source. The first drain is coupled to the first power pin. The first impedance unit is coupled between the first source and the second power pin. The second impedance unit is coupled between the first drain and the first gate. When the voltage level of the first power pin is equal to a pre-determined level, the first gate of the native N-type transistor receives an adjusting signal to adjust an equivalent impedance of the native N-type transistor.

Abstract: EMarker and associated cable and method. The cable includes a CC (configuration channel) wire, the eMarker includes an active trigger circuit and a protection circuit coupled to the active trigger circuit and the CC wire. When a second port connects a first port via the cable, if a predefined event happens, the active trigger circuit triggers the protection circuit to change an electric characteristic of the CC wire, such that the first port detects a detachment of the second port.

Abstract: A control circuit disposed in a connection line including a first power pin and a second power pin and including a native N-type transistor, a first impedance unit, and a second impedance unit is provided. The native N-type transistor includes a first gate, a first drain and a first source. The first drain is coupled to the first power pin. The first impedance unit is coupled between the first source and the second power pin. The second impedance unit is coupled between the first drain and the first gate. When the voltage level of the first power pin is equal to a pre-determined level, the first gate of the native N-type transistor receives an adjusting signal to adjust an equivalent impedance of the native N-type transistor.