• Theory:-

> Definition: A 4×1 MUX is a combinational circuit that selects one out of four input lines and passes it to the single output line based on 2 select lines. 

     > Selection Mechanism:

 The combination of S1 and S0 determines which input is connected to the output.

Truth table mapping:

• • s1s0 = 00 → y = d0

  • s1s0 = 01 → y = d1

  • s1s0 = 10 → y = d2

  • s1s0 = 11 → y = d3

• Logic Diagram:-

BLOCK DIAGRAM:

TRUTH TABLE: