以下代码功能是
module_mux(input[7:0] data_in, input[2:0] sel, output reg out);
input[7:0] data_in;
input[2:0] sel;
output out;
reg out;
always@(data_in or sel)
begin
case(sel)
3'b001: out = data_in[0];
3'b010: out = data_in[1];
3'b011: out = data_in[2];
3'b100: out = data_in[3];
3'b101: out = data_in[4];
3'b110: out = data_in[5];
3'b111: out = data_in[6];
default: out = data_in[7];
endcase
end
endmodule
