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 reg_a; always@(posedge clk or negedge rst_n)begin if(!rst_n)begin reg_a <= 1'b0; end else begin reg_a <= a; end end always@(posedge clk or negedge rst_n)begin if(!rst_n)begin rise <= 0; down <= 0; reg_a <= a; end else if((reg_a==1'b0)&&(a==1'b1))begin rise <= 1'b1;down <= 1'b0; end else if((reg_a==1'b1)&&(a==1'b0))begin rise <= 1'b0;down <= 1'b1; end else begin rise <= 1'b0; down <= 1'b0; end end endmodule