verilog写1101序列检测器

以下是一个简单的Verilog代码来检测1101序列：

module seq_detector(
input clk,
input reset,
input data,
output reg detected
);

reg [3:0] state;

parameter IDLE = 4'b0000;
parameter S1 = 4'b0001;
parameter S2 = 4'b0010;
parameter S3 = 4'b0100;
parameter DETECTED = 4'b1000;

always @(posedge clk or posedge reset) begin
if (reset) begin
state <= IDLE;
detected <= 0;
end else begin
case (state)
IDLE: begin
if (data) begin
state <= S1;
end
end
S1: begin
if (data) begin
state <= S2;
end else begin
state <= IDLE;
end
end
S2: begin
if (data) begin
state <= S3;
end else begin
state <= IDLE;
end
end
S3: begin
if (data) begin
state <= DETECTED;
detected <= 1;
end else begin
state <= IDLE;
end
end
DETECTED: begin
if (!data) begin
state <= IDLE;
detected <= 0;
end
end
default: begin
state <= IDLE;
detected <= 0;
end
endcase
end
end

endmodule

该代码包含一个有限状态机，它根据输入数据的值来转换状态。当检测到序列1101时，它会将检测器的输出设置为1。当输入数据不再匹配序列时，它将重置状态并将检测器的输出设置为0。