题解 | #边沿检测#
边沿检测
https://www.nowcoder.com/practice/fed4247d5ef64ac68c20283ebace11f4
`timescale 1ns/1ns module edge_detect( input clk, input rst_n, input a, output reg rise, output reg down ); reg a_tmp; always@(posedge clk or negedge rst_n)begin if(!rst_n)begin a_tmp <= 0; end else begin a_tmp <= a; end end always@(posedge clk or negedge rst_n)begin if(!rst_n)begin rise <= 0; down <= 0; end else begin case({a_tmp,a}) 2'b01 : begin rise <= 1; end 2'b10 : begin down <= 1; end default : begin rise <= 0; down <= 0; end endcase end end endmodule