verilog消抖代码
时间: 2023-10-19 16:06:22 浏览: 30
以下是一个简单的 verilog 消抖代码的示例:
module debounce (
input clk,
input rst,
input button,
output reg debounced_button
);
reg [2:0] state;
parameter debounce_time = 3'd3;
always @ (posedge clk or posedge rst)
begin
if (rst)
begin
state <= 3'b000;
debounced_button <= 1'b0;
end
else
begin
case (state)
3'b000: if (button == 1'b1) state <= 3'b001; else state <= 3'b000;
3'b001: if (button == 1'b1) state <= 3'b010; else state <= 3'b000;
3'b010: if (button == 1'b1) state <= 3'b011; else state <= 3'b000;
3'b011: if (button == 1'b1) debounced_button <= 1'b1; state <= 3'b100;
3'b100: if (button == 1'b0) state <= 3'b000; else state <= 3'b100;
endcase
end
end
endmodule
这段代码可以将输入的按键信号去除反弹,从而产生可靠的按键触发信号 debounced_button。在 debounce_time 参数中可以设置消抖的时间,这里默认为 3 个时钟周期。