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      Microsoft Interview Question

      Hardware Engineer Interview

      Design an XOR gate using only two 2:1 mux.

      Interview Answers

      Anonymous

      Dec 20, 2014

      Well it say only using 2 muxes. So it's not allowed to use XOR. The alternate can be: Mux1: (sel = B; in1=0; in2=1) Mux2: (sel = A; in1 = B; in2=mux1_out)

      1

      Anonymous

      Aug 9, 2012

      Mux with input ports A and B, and control C, where C=0 selects A for output and C=1 selects B for output. Mux1: connect 1 to A, 0 to B, XOR INPUT1 to C Mux2: connect XOR INPUT1 to A, mux1 output to B, and XOR INPUT2 to C done.

      2
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