Design of Multi-Serial Port Controller based on PCIe

To meet the requirements of long-distance data transmission, high reliability, and fast reception, a PCIe-based multi-serial port controller design scheme is proposed. The design utilizes Xilinx K7 series FPGA chips and incorporates the internal PCIe IP core. Configurable parameters such as serial port baud rate and FIFO depth are employed, enabling simultaneous data transmission and reception for 32 serial ports. Firstly, the system architecture and principles are analyzed. Secondly, detailed designs for PCIe, serial ports, and interrupt controllers are presented, with a focus on analyzing the logic and software processing flow under nested interrupt conditions to avoid improper handling that may cause abnormal operation of the serial ports. Finally, the functionality is verified on an FPGA development board. The results indicate that the designed multi-serial port controller meets the performance requirements for serial ports in industrial automation system integration and provides valuable insights for enhancing device integration.