verilog mux

A mux (short for multiplexer) in Verilog is a digital logic component that selects one of several input signals and outputs it to a single output based on a control signal. The Verilog code for a 4:1 mux (4 inputs and 1 output) is shown below:

module mux4(input [3:0] data_in, input [1:0] sel, output reg out);
always @ (sel or data_in)
begin
  case(sel)
    2'b00: out = data_in[0];
    2'b01: out = data_in[1];
    2'b10: out = data_in[2];
    2'b11: out = data_in[3];
  endcase
end
endmodule

In this code, the `data_in` input is a 4-bit signal representing the 4 possible input signals to the mux. The `sel` input is a 2-bit signal representing the control signal that selects which input is output to the `out` output. The `out` output is a single bit signal representing the selected input signal.

The `always` block in the code is a combinational logic block that activates whenever there is a change in the `sel` or `data_in` inputs. The `case` statement in the block selects which input signal to output based on the `sel` control signal.

This code can be synthesized to create a hardware implementation of the mux.