| 摘要 |
A computer which has an ACPI compliant PCI-to-PCI bridge allows additional devices to be inserted, and allows existing devices to be removed or relocated without restarting the computer. A first PCI bus serves as a local bus, allowing a number of devices, including a PCI-to-PCI bridge, to be connected to the processor of a computer system. The first PCI bus also provides power and a clock signal to the PCI-to-PCI bridge and to various other PCI devices located in slots on the bus. The voltage level of the supplied power is controlled by software running on the processor. based on information obtained from the devices during power-up. The PCI-to-PCI bridge allows expansion by coupling a second PCI bus to the first PCI bus, via the PCI-to-PCI bridge. The second PCI bus includes a number of PCI slots, one of which is coupled to the PCI-to-PCI bridge and receives clock and power signals from the PCI-to-PCI bridge. Other devices may be connected to the second PCI bus by inserting the additional devices into slots in the second PCI bus. Additional PCI buses may be connected to the first and second PCI buses by inserting additional PCI-to-PCI bridges into slots in the PCI buses. Only one PCI bridge subsystem need be disabled, i.e. the one to which the new device is to be added or from which a preexisting device is to be removed.
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