Stability of State Machine in FPGA Design

For the problem that in temperature test,high temperature causes the FPGA state machine stability decreases and the illegal state causes the recorder can not work normally,put forward the coding mode and FPGA integrated two aspects of optimization,to overcome the problem of poor high temperature stability.By viewing the state machine waveform and the analysis of cause of the problem,the comparison of various coding mode selected by using One-hot coding and synthesis constraint method,the results proved that the state machine stability is improved to a great extent,recorder in high temperature returned to normal work.