Similar to the role of PCI/PCIX Bridge in PCI/PCIX bus architecture, the basic function of PCI Express (PCIe) Switch is to expand the connectivity to allow more end devices being reached by host controllers in terms of PCIe serial interconnect architecture. This 16-lane and 8-port PCIe Switch can extend the connections ranged from 2 to 7 PCIe devices by means of its flexible port and lane configurations. It provides users the variety to expand or fan-out the PCI Express lanes from one host based upon their application needs. On top of that, one port of the packet switch can be configured to connect with other host, so that the dual-host usage case can be realized.