ocr: TYPICAL PCI - LOCAL BUS ARCHITECTURE CPU CPUbUS Cache memory Main memory PCIi intertace PCllocalbus 1 32-bit cata/182MBps Expanded bus controller Disk Video PCI I - - - - - - a - - I - 16-bit dato/5MBps - a - Internal peripherals Graphics SCSI LAN Video External PCI peripheral cards Fax/modem Printer ISA or EISA FIGURE 1: Instead of putling peripherois on a separaie (and slow) exponsion bus, PCI provides a high-speed poth thal connects peripheral devices directiy to the CPU and main memory, improving bus transter rale and system performance.
