Motherboard and interface control method of memory slot thereof

An interface control method of a memory slot, adapted for a motherboard including a plurality of slot groups, a bus, and an interface controller, wherein each of the slot groups has a first memory slot and a second memory slot electrically connected with the bus, respectively, the first memory slot has a plurality of first connection pins, and the second memory slot has a plurality of second connection pins, the interface control method of the memory slot comprising:

• receiving a first voltage and a second voltage with different levels via a second input pin of the second connection pins and a first input pin of the first connection pins, respectively, to form two different access addresses;
• transmitting a plurality of pin control signals to the corresponding slot groups via the interface controller to make the two access addresses of the first memory slot and the second memory slot of a using slot group of the slot groups different from the two access addresses of the first memory slot and the second memory slot of each of the other slot groups;
• and
• accessing the using slot group via the interface controller.