`timescale 1ns/1ns module RTL( input clk, input rst_n, input data_in, output reg data_out ); reg data_in_reg ; always@(posedge clk or negedge rst_n)begin if(!rst_n) data_in_reg <= 1'b0 ; else data_in_reg <= data_in ; end always@(posedge clk or negedge rst_n)begin if(!rst_n) data_out <= 1'b0 ; else data_out <= (data_in & (~data_in_reg)) ; end endmodule