Patent ID: 6567882
Filing Date: 2003-05-20
Classification: G06F

Abstract:
A PCI function extension control device in a PCI bus system, comprisinga PCI function extension control circuit to be connected to a first PCI bus; a second PCI bus possessed by said PCI function extension control circuit; a bus switch to be connected between the first PCI bus and a second PCI bus; and means for disconnecting or connecting the first PCI bus and the second PCI bus upon the reception of an open and close control signal, respectively, from said PCI function extension control circuit, said bus switch being connected to said PCI function extension control circuit; and said PCI function extension control circuit being composed to monitor a transaction of the first PCI bus and the second PCI bus, to make said bus switch emit an open and close control signal when the transaction concerns an access to a desired PCI extension configuration area added to said PCI function extension control circuit to provide a PCI agent device with an extended configuration area for extending PCI functions of the PCI agent device, and to deliver a desired PCI control signal to the first PCI bus or the second PCI bus.