各位达人们，现在正在使用9910产生点频信号，现在出现了点问题，求助~~
若使用1.0G外部时钟 配置寄存器可以产生210M点频信号，然后将时钟换为40M后倍频系数25倍，发现锁相环不能锁定，但是将时钟换为25M后，倍频系数40倍可以正常锁定，50M 20倍的时候 试了一次 也能锁定。
环路的参数是按照要求计算的，麻烦问一下 这应该是怎么回事呢？
谢谢了！
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