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LMX2572LP: 多片时钟芯片同步

Part Number: LMX2572LP

手册中关于同步的描述:在OSCin的上升沿捕获sync的上升沿,经过t1,两片pll的输出同步上,t2为输出与参考时钟的确定性的延迟

时序要求:tcs_min=2.5ns,tch_min=2ns

OScin是100M的时钟,OScin与SYNC满足时序要求,但是pll输出的时钟信号同步不上。每SYNC一次,两片pll输出的时钟相位差会变化一次,但是未同步

pll的配置如下: