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 pre,now;
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
begin
now<=1'b0;
pre<=1'b0;
down<=1'b0;
rise<=1'b0;
end
else
begin
now<=a;
pre<=now;
end
end
always @(*)
begin
case ({now,pre})
2'b10:begin rise=1'b1;down=1'b0;end
2'b01:begin rise=1'b0;down=1'b1;end
default:begin rise=1'b0; down=1'b0;end
endcase
end
endmodule
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