Determine the function performed by the combinational circuit of the given figure.
Determine the function performed by the combinational circuit of the given figure.
Circuit: three 2-to-1 MUXes. MUX-1 has inputs I3 (to its I1) and I2 (to its I0). MUX-2 has inputs I1 (to its I1) and I0 (to its I0). The select lines of MUX-1 and MUX-2 are tied together to S1. The output Y of MUX-1 goes to input I1 of MUX-3 and the output Y of MUX-2 goes to input I0 of MUX-3. MUX-3 has select S0 and output F.
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Correct answer: (A) 4-to-1 multiplexer
Explanation
MUX-1 and MUX-2 choose between I3/I2 and I1/I0 using S1, and MUX-3 chooses between their outputs using S0. Four inputs and two select lines make a 4-to-1 multiplexer.