A generic mux (2)

module mux #(parameter m = 4, w = 2) (
    input [m-1:0][w-1:0] x,
    input [$clog2(m)-1:0] s,
    output reg [w-1:0] y
    );

    always @(x, s)
    begin
        y = x[s];
    end
endmodule