数据选择器则将两个计数器中处于保持状态的奇偶数据交替输出，实现双边沿触发加法计数器的功能。
Data selector alternately to realize the functions of double edge trigger addition counter output the odd and even data in two counters.
数据选择器是一种能从多个输入数据中有选择地将一个输入数据送到输出端的组合逻辑电路。
Multiplexer is a kind of combinational logic circuit, which can be selected an in-put datum among several data and sent it to out-put port.
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