In the synchronizing interface design of the digital system,the I/O of the FPGA always needs to butt the surrounding chips.In this time,the timing problem of the I/O shows especial importance.

• 在数字系统的同步接口设计中,可编程逻辑器件的输入输出往往需要和周围新片对接,此时I/O接口的时序问题显得尤为重要。