使用lmk04808输出时钟驱动serdes,当PLL2锁定时输出的时钟频率正确,却无法驱动serdes正常工作;
但当PLL2失锁时输出的时钟反而可以驱动serdes工作;
使用示波器观察PLL2锁定时输出波形如下图,发现波形难以锁定;
而serdes正常工作时得时钟波形,示波器可以锁定,波形无重影;
请高手们帮忙分析。。。
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