pci、pcie相关基础知识，包括信号的定义、总线操作、电气特性、配置空间的访问等。,pci, pcie related to basic knowledge, including the definition of the signal, bus operation, electrical characteristics, such as configuration space access.

pci-e协议 base rev 2.0-pci-express base rev 2.0

PCI作为一种稳定的高速的设备扩展总线，因其良好的可扩展性和兼容性使其经历了20多年的使用，PCI协议规范不断扩展、更新。现在更有PCI-X、PCI-E总线的不断涌现，虽然说它们与PCI总线不能够兼容使用，但它们无疑都是都在PCI总线的基础上发展而来的。-PCI as a stable high-speed device extension bus, because of its good scalability and compatibility make its experience in