一个 PCI 驱动,实现PC 机与 PCI9045 的通信-A PCI driver, the realization of PC computer and communications PCI9045

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.