PCI总线扩展技术分析与系统设计

PCI Bus Extension Technology Analysis and System Design

PCI系统结构中,计算机主板上每个PCI插槽所提供的信号只能直接连接一个PCI元件,这样限制了PCI板卡的功能扩展。通过PCI-PCI桥接技术,能突破这一限制。该文介绍了PCI-PCI桥接技术的原理,并就一种典型PCI-PCI桥接芯片21150的结构原理和接口特性进行了深入分析。在此基础上提供了一个包含多PCI元件的PCI板卡电路设计实例,为此类系统的设计提供了参考和依据。

In PCI system,the signals of each PCI slot in a PC main board are only enough for a single PCI compo-nent ,which limits the function extension.The limit can be broken with PCI-PCI bridge technology.The paper introduces PCI-PCI bridge technology and a kind of typical PCI bridge IC.A circuit with multiple PCI components is provided,which can be regarded as a reference.