module 2_4 ( clk, rst_n, 2_data, 4_data); input clk; input rst_n; input [1:0] 2_data; output [3:0] 4_data;always@(posedge clk, negedge rst_n) begin if (!rst_n) begin 2_data<= 0; 4_data<= 0; end else case (2_data) 00 : 4_data<=4'b0001; 01 : 4_data<=4'b0010; 10: 4_data<=4'b0100; 11 : 4_data<=4'b1000; default : 4_data<=4'b0000;endcase endendmodule