North and South Bridges

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PCI architecture is based on the concept of bridging. A PCI bus has a north bridge and a south bridge. The north bridge communicates with the CPU and is used to send signals to devices that run at higher speeds, such as memory and high-speed graphics ports. The south bridge communicates with a super I/O chip and is used to send signals to slower devices, such as ISA slots, COM ports, and LPT ports.

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