Motherboard device and method for detecting add-in card of motherboard device

A method for detecting an add-in card of a motherboard device, the method comprising:

• determining detection information of a bus slot, wherein the bus slot includes a first pin terminal and a second pin terminal;
• providing a corresponding control signal to a control terminal of a switching circuit via a controller according to the detection information, wherein the switching circuit includes a first terminal, a second terminal, a third terminal, and a control terminal, the first terminal is coupled to the first pin terminal, the second terminal is coupled to the second pin terminal, the third terminal is coupled to the first terminal and to a clock enable terminal, and a clock enable signal is provided by the clock enable terminal;
• and
• the third terminal selectively being connected to the first terminal or t to the second terminal via the switching circuit according to the corresponding control signal.