用verilog实现秒计时器,板上默认的时钟为100MHz,接口定义为module Timer ( input clk, /* 100MHz / input rst, input en, output [3:0] one, output [3:0] ten, output co ); Divider div( .clk_in(clk), / 100MHz / .rst(rst), .clk_o(...) / 1HZ */ ); Counter_99 cnt(...); endmodule
时间: 2023-06-13 17:02:02 浏览: 65
下面是用Verilog实现秒计时器的代码:
```verilog
module Timer (
input clk, // 100MHz
input rst,
input en,
output [3:0] one,
output [3:0] ten,
output co
);
// Counter_99模块用于计算秒数的个位和十位
Counter_99 cnt(
.clk(clk),
.rst(rst),
.en(en),
.one(one),
.ten(ten),
.co(co)
);
// Divider模块用于将100MHz时钟分频为1Hz时钟
Divider div(
.clk_in(clk),
.rst(rst),
.clk_o(co)
);
endmodule
module Counter_99 (
input clk,
input rst,
input en,
output reg [3:0] one,
output reg [3:0] ten,
output reg co // 进位信号
);
always @(posedge clk or posedge rst) begin
if (rst) begin
one <= 4'b0000;
ten <= 4'b0000;
co <= 1'b0;
end
else if (en) begin
if (one == 4'b1001) begin
one <= 4'b0000;
ten <= ten + 4'b0001;
if (ten == 4'b1010) begin
ten <= 4'b0000;
co <= 1'b1;
end
end
else begin
one <= one + 4'b0001;
end
end
end
endmodule
module Divider (
input clk_in,
input rst,
output reg co,
output reg clk_o
);
reg [31:0] count;
always @(posedge clk_in or posedge rst) begin
if (rst) begin
count <= 32'h0000_0000;
clk_o <= 1'b0;
co <= 1'b0;
end
else begin
count <= count + 32'h01;
if (count == 32'h01_86_A0_00) begin // 100_000_000 / 100 = 1_000_000
count <= 32'h0000_0000;
clk_o <= ~clk_o;
co <= 1'b0;
end
end
end
endmodule
```
其中,Counter_99模块用于计算秒数的个位和十位,Divider模块用于将100MHz时钟分频为1Hz时钟。在Timer模块中,将这两个模块连接起来,实现秒计时器的功能。其中,en信号用于控制计时器的启停。