介绍了PCI桥的配置空间配置头的结构及其配置原理，介绍了配置空间的访问方法；详细阐述了三种桥（PCI-PCI桥、PCI-ISA桥以及PCI Host桥）配置及其层次结构，对应的各个寄存器的含义，结合VxWorks系统，讲述了基于PowerPC架构的PLX6150桥（PCI6150）芯片、W83628AG以及MPC8247 PCI桥的配置和实现方法。

关键词：PCI桥；PLX6150桥芯片；W83628AG；MPC8247；VxWorks-Describes the PCI bridge configuration header of the configuration space structure and configuration theory, describes the configuration space access method　elaborated on three kinds of bridges (PCI-PCI bridges, PCI-ISA Bridge and PCI Host Bridge) configuration and its hierarchical structure , corresponding to the various registers of the meaning, combined with VxWorks system, described based on the PowerPC architecture PLX6150 Bridge (PCI6150) chips, W83628AG as well as the MPC8247 PCI bridge configuration and realization method. Key words: PCI bridge　PLX6150 bridge chip　W83628AG　MPC8247　VxWorks