Intelligent PCIe slot lane assignment method

An intelligent PCIe slot lane assignment method applied to a motherboard comprising a CPU, a switch circuit, a PCIe slot assembly and a logic controller, said CPU providing at least 16 lanes, said PCIe slot assembly comprising a first PCIe slot, a second PCIe slot and a third PCIe slot, said logic controller being adapted to detect the insertion of a PCIe expansion card in said PCIe slot assembly and to control said switch circuit to assign said at least 16 lanes to said first PCIe slot, said second PCIe slot and said third PCIe slot according to the detection result, the intelligent PCIe slot lane assignment method comprising the steps of:

• (a) start;
• (b) said logic controller automatically detecting the insertion of an expansion card in said third PCIe slot, and then proceeding to step (c) when detected the presence of an expansion card in said third PCIe slot, or step (d) when detected no expansion card in said third PCIe slot;
• (c) said logic controller controlling said switch circuit to assign 8 said lanes to said first PCIe slot and respective 4 said lanes to said second PCIe slot and said third PCIe slot;
• (d) said logic controller automatically detecting the insertion of an expansion card in said second PCIe slot, and then proceeding to step (e) when detected the presence of an expansion card in said second PCIe slot, or step (f) when detected no expansion card in said second PCIe slot;
• (e) said logic controller controlling said switch circuit to assign respective 8 said lanes to said first PCIe slot and said second PCIe slot and assign no lane to said third PCIe slot;
• (f) said logic controller controlling said switch circuit to assign 16 said lanes to said first PCIe slot and assign no lane to said second PCIe slot and said third PCIe slot.