Design and optimization of feedback retransmission protocol based on cyclic redundancy check

In order to meet the application requirements of reliable remote information interaction between acquisition equipment and ground control console, a transmission protocol with cyclic redundancy check and feedback retransmission functions is proposed on the FPGA platform. In the process of testing, due to the metastable phenomenon of FPGA transmission across the clock domain, the flag bit of the feedback instruction is not received correctly, resulting in incorrect data. The protocol is further optimized, in the embedded software protocol module of the receiver and the transmitter, the data is aligned using the response operation, making the data transmission link more stable. The test results show that the reliability of the optimized CRC feedback retransmission protocol with self-error detection function is improved, and it has a wide range of engineering application scenarios.