HDLBits 刷题（Karnaugh Map　to Circuit）

For the following Karnaugh map, give the circuit implementation using one 4-to-1 multiplexer and as many 2-to-1 multiplexers as required, but using as few as possible. You are not allowed to use any other logic gate and you must use a and b as the multiplexer selector inputs, as shown on the 4-to-1 multiplexer below.

题目.png

这里需要清楚对mux_in[0],mux_in[1],mux_in[3],mux_in[3]分别采用c,d的表述形式，就是你要清楚知道mux_in[0]时是cd分别表示01，11，10时才会得到的结果。也就是当c+d = 1时才会得到mux_in[0]= 1的表达。也就是意味着仅仅c,d都为0时，结果才会为0.