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见附图
您指的2/1 T=1ns<1.86ns如何理解？ T=2ns, 1/2T=1ns, 1ns<1.86ns.
哦，我表达得不够清楚。
500MHz是输入时钟频率的最大值，在这个表格下面的第四条注释中有解释，测试频率是200MHz，所以周期应为5ns。
