Patent ID: 7447825
Filing Date: 2008-11-04
Classification: G06F

Abstract:
1. A Peripheral Component Interconnection Express (PCI-E) automatic allocation system applied in a computer system, wherein the computer system comprises at least one first PCI-E slot with large lane width and one second PCI-E slot with small lane width, said first and second PCI-E slots being equipped with ground pins respectively, with said PCI-E lanes being selectively allocated to said first and second PCI-E slots, said PCI-E automatic allocation system comprising: a detection module configured to detect states of logic signals on the ground pins of said first and second PCI-E slots and determine whether said first and second PCI-E slots are inserted with any expansion card; if said detection module detects an inserted expansion card in said first PCI-E slot rather than said second PCI-E slot, a switch control signal is generated and outputted; and a switch module configured to perform a switch operation based on the switch control signal outputted by said detection module, such that lanes previously assigned to said second PCI-E slot are reassigned to said first PCI-E slot, wherein upon detecting the absence of an inserted expansion card in said first PCI-E slot, said detection module generates a state retention signal and outputs the signal to said switch module such that said switch module does not perform any switch operation but maintains status quo.