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Thinking, Express

测验题目

问题：

Design all the basic gates NOT, AND, OR, NAND, NOR, XOR, XNOR using 2:1 Multiplexer.

参考答案：

MUX(A, B, S) = A*S + B*S'

NOT(A)      = MUX(0, 1, A) = 0*A + 1*A' = A' 
AND(A, B) = MUX(A, B, B) = A*B
OR(A,B)     = MUX(A, B, A) = A+B