含有：多时钟系统设计，如何处理建立保持时间，如何处理内部三态电路，消除组合逻辑产生的毛刺，用单片机配置fpga-contain : multi-clock system design, how to deal with the establishment and maintenance of the time, how to handle the internal three-state circuit, Elimination of the combinational logic Burr,