外围组件接口技术（Peripheral Component Interconnect PCI）是一种新型的高带宽、处理器无关的总线系统。它既可以作为中间层的总线也可以作为周边总线系统使用。与其他普通总线规范想对照，PCI 总线为高速I/O设备提供了更好的支持（比如图形适配器、网络接口控制器、磁盘控制器，等等）。现行的标准允许在33Mhz下使用64根数据线，纯传输速率可达2.11Gbps。但是PCI吸引人的地方不在于它的高速度，它适应了现代I/O设备对系统的要求，并且只需要很少的芯片就可以实现并支持其他总线系统。-Peripheral Component Interface Technology (Peripheral Component Interconnect PCI) is a new type of high-bandwidth, the processor s bus system has nothing to do. It can serve as a middle layer of the bus can also be used as a peripheral bus system. With other norms would like to control the ordinary bus, PCI bus for high-speed I/O device provides a better support (such as graphics adapters, network interface controllers, disk controllers, etc.). Existing standard to allow 33Mhz using 64 data lines, pure transfer rate up to 2.11Gbps. PCI attractive place but do not lie in its high-speed, it adapted to the modern I/O devices on the system requirements, and require only a few chips can be achieved and to support other bus systems.