Electronic Device and Detecting Method

An electronic device comprising:

• a processing unit;
• a control unit coupled to the processing unit and providing a first expansion bus or a second expansion bus;
• and
• an expansion device coupled to the control unit through the first expansion bus or the second expansion bus, the expansion device comprising:
• a first expansion bus interface;
• a second expansion bus interface;
• and
• a control system coupled to the first expansion bus interface and the second expansion bus interface, the control system comprising:
• an enable module for turning on the first expansion bus interface or the second expansion bus interface;
• a detecting module for detecting whether the control unit transmits a feedback signal after the first expansion bus interface or the second expansion bus interface is turned on;
• and
• an execution module for implementing signal communication between the expansion device and the control unit through the first expansion bus interface when the feedback signal is transmitted from the control unit after the first expansion bus interface is turned on, or for implementing signal communication between the expansion device and the control unit through the second expansion bus interface when the feedback signal is transmitted from the control unit after the second expansion bus interface is turned on.