1前言PCIe技术可作为母板级互联(连接安装在母板上的外设)、无源背板互联,以及插入电路板的扩展卡接口等,适用于从工业和医疗到消费类和服务器应用等电子行业的所有领域。PCIe规范于2003年由PCI特殊兴趣组(PCI-SIG)推出,此后不断发展,数据速率和带宽都不断提高。这一规范不但是高端处理器和FPGA中软核知识产权(IP)的主要规范,而且还逐步涉及到FPGA中的硬核IP。以前,主要由高性能和中端 1 Introduction PCIe technology can be used as a motherboard-level interconnect (connected to motherboard-mounted peripherals), a passive backplane interconnect, and an expansion card interface into a circuit board for applications ranging from industrial and medical to consumer and server applications All areas of the electronics industry. The PCIe specification was introduced by the PCI Special Interest Group (PCI-SIG) in 2003 and continues to evolve since the data rate and bandwidth have been increasing. Not only is this specification the primary specification for soft-core intellectual property (IP) in high-end processors and FPGAs, it is also progressively involved with hard IP in FPGAs. Previously, mainly by high performance and midrange