Introduction - If you have any usage issues, please Google them yourself
Need some clock switching circuit, such as a circuit supports high-speed mode and low-speed mode, the system works in 125M clock, the system clock work at 3M, you need a dynamic clock in this design in high-speed mode at low speed mode the high frequency switching to the low frequency, or low to high frequency switch, the switching process glitches may occur, is very dangerous, this program can effectively avoid this problem