用Verlog代码写一个Mealy型状态机,要求能设计一个可以识别“01101”的序列检测电路并编写测试文件testbench.v 文件进行仿真
时间: 2023-12-03 21:42:30 浏览: 45
以下是Verilog代码实现:
```verilog
module seq_detector(
input clk,
input rst,
input din,
output reg dout
);
parameter S0 = 2'b00;
parameter S1 = 2'b01;
parameter S2 = 2'b10;
parameter S3 = 2'b11;
reg [1:0] state;
reg [1:0] next_state;
always @(posedge clk or posedge rst) begin
if (rst) begin
state <= S0;
dout <= 1'b0;
end else begin
state <= next_state;
dout <= (state == S3);
end
end
always @* begin
case (state)
S0: begin
if (din) begin
next_state = S1;
end else begin
next_state = S0;
end
end
S1: begin
if (din) begin
next_state = S2;
end else begin
next_state = S0;
end
end
S2: begin
if (din) begin
next_state = S3;
end else begin
next_state = S0;
end
end
S3: begin
if (din) begin
next_state = S3;
end else begin
next_state = S0;
end
end
default: next_state = S0;
endcase
end
endmodule
```
以下是testbench.v文件的代码:
```verilog
module seq_detector_tb;
reg clk;
reg rst;
reg din;
wire dout;
seq_detector dut (
.clk(clk),
.rst(rst),
.din(din),
.dout(dout)
);
initial begin
clk = 1'b0;
forever #10 clk = ~clk;
end
initial begin
rst = 1'b1;
din = 1'b0;
#20 rst = 1'b0;
#10 din = 1'b0;
#10 din = 1'b1;
#10 din = 1'b1;
#10 din = 1'b0;
#10 din = 1'b1;
#10 din = 1'b0;
#10 $finish;
end
endmodule
```
在仿真中,dout将在第5个时钟周期处变为1,表示检测到了序列“01101”。