Theory 

• A combinational circuit that selects one of 8 input lines (D0–D7) and routes it to a single output (Y) based on 3 select lines (S2, S1, S0). Inputs: 8 data inputs, 3 select inputs

• Output: 1 output line

• Selection Logic: The binary value of the select lines determines which input is passed to the output.

truth table                                boolean expression:

Block diagram 

DATA FLOW DESCRIPTION

verilog code:

module mux (

    input wire d0, d1, d2, d3,   // Data inputs

    input wire s0, s1,           // Select inputs

    output wire y                // Output

);

assign y = (~s1 & ~s0 & d0) |   // When s1s0 = 00

           (~s1 &  s0 & d1) |   // When s1s0 = 01

           ( s1 & ~s0 & d2) |   // When s1s0 = 10

           ( s1 &  s0 & d3);    // When s1s0 = 11

endmodule

 test bench 

module tb_mux;

reg d0, d1, d2, d3;

reg s0, s1;

wire y;

// Instantiate the MUX

mux DUT (

    .d0(d0),

    .d1(d1),

    .d2(d2),

    .d3(d3),

    .s0(s0),

    .s1(s1),

    .y(y)

);

initial begin

    // Test case 1: select d0

    d0 = 0; d1 = 1; d2 = 0; d3 = 1;

    s1 = 0; s0 = 0;

    #10;

    // Test case 2: select d1

    s1 = 0; s0 = 1;

    #10;

    // Test case 3: select d2

    s1 = 1; s0 = 0;

    #10;

    // Test case 4: select d3

    s1 = 1; s0 = 1;

    #10;

end

endmodule

BEHAVIORAL DESCRIPTION:

verilog code:

module mux8_1(y,s,i);

output y;

input [2:0]s;

input [7:0]i;

reg y;

always@(s,i)

begin

case(s)

3'b000: y=i[0];

3'b001: y=i[1];

3'b010: y=i[2];

3'b011: y=i[3];

3'b100: y=i[4];

3'b101: y=i[5];

3'b110: y=i[6];

3'b111: y=i[7];

endcase

end

endmodule

testbench:

module tb_mux8_1;

  reg [2:0] s;

  reg [7:0] i;

  wire y;

  mux8_1 DUT(y, s, i);

  initial begin

    i = 8'b10101010;

    s = 3'b000; #10;

    s = 3'b001; #10;

    s = 3'b010; #10;

    s = 3'b011; #10;

    s = 3'b100; #10;

    s = 3'b101; #10;

    s = 3'b110; #10;

    s = 3'b111; #10;

    $finish;

  end

endmodule

output obtained 

Pin Assignment

RTL SCHEMATIC POWER 

TIME UTILIZATION REPORT