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虽然datasheet标注的很清楚了，但还是想确认下。如果不能的话，要进行电平转换是否有特殊要求？
可以使用HCSL输入：Two Universal Inputs Operate up to 3.1 GHz and Accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or Single-Ended Clocks
One Crystal Input Accepts a 10 to 40 MHz Crystal or Single-Ended Clock
