Verilog code to implement a 4-bit multiplexer circuit with enable.

Here’s an example Verilog code to implement a 4-bit multiplexer circuit with enable:

module mux_with_enable (output reg [3:0] out, input [3:0] in0, input [3:0] in1, input enable);

    always @(*) begin
        if (enable)
            out = in1;
        else
            out = in0;
    end

endmodule

This code defines a module called “mux_with_enable” that implements a 4-bit multiplexer with enable. The output “out” is a registered output that represents the selected input value. The inputs “in0” and “in1” are two 4-bit inputs that represent the input values to be selected. The input “enable” is a 1-bit input that controls the selection of the input values.

The “always” block is a combinational logic block that selects the input values based on the value of the “enable” input. If “enable” is 1, the output is set to “in1”. If “enable” is 0, the output is set to “in0”.

Note that this Verilog code assumes that the “out”, “in0”, and “in1” signals are all 4-bit signals, and the “enable” input is a 1-bit signal. If you want to use different signal widths, you would need to modify the code accordingly. Additionally, this code implements a combinational circuit, which means that the output is updated immediately whenever there is a change in the input signals. If you wanted to implement a registered circuit, you would need to modify the code accordingly.