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之前电路使用26MHZ有源晶振 配置输出可以锁定输出两路40.96MHz信号和一路32.768MHz
最近更改为40MHz有源晶振,但是配置锁定始终失败,参数从软件得到输入的
crystal输入的话,输入频率不能超过32MHz,所以如果是40MHz输入,只能选择LVCMOS 输入。 因此需要符合LVCMOS 1.8V电平标准