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二、数据选择器(一)原理数据选择器又称多路开关,它是以与或非门为主体的门阵列。在选择控制信号作用下,从多通道数据输入中选择某一通道的数据作为输出。它相当于一个“多刀多掷”的波段开关。图24是四通道选一数据选择器的原理图。D_0～D_3是输入数据,S_0、S_1是通道选择控制端。例如当S_0S_1=00时,只有与门8是打开的,数据D_0被选择;当S_0S_1=10时,只有与门7是打开的,D_1被选。输出表达式为
Second, the data selector (A) Principle Data selector, also known as multi-channel switch, which is based on NOR gate as the main gate array. Under the function of selecting control signal, select the data of a certain channel from multi-channel data input as output. It is equivalent to a “multi-knife” band switch. Figure 24 is a schematic of a four-channel select one data selector. D_0 ~ D_3 is the input data, S_0, S_1 is the channel selection control terminal. For example, when S_0S_1 = 00, only AND gate 8 is on, data D_0 is selected. When S_0S_1 = 10, only AND gate 7 is on and D_1 is selected. The output expression is