序列1010状态机代码

下面是一个简单的序列1010状态机代码，使用Verilog语言实现：

module seq_1010(
  input clk,
  input reset,
  input data_in,
  output reg seq_out
);

// 定义状态枚举类型
typedef enum logic [1:0] {
  IDLE,
  SEQ_1,
  SEQ_2,
  SEQ_3
} state_t;

// 定义状态寄存器和下一个状态变量
reg [1:0] state, next_state;

// 初始化状态为IDLE
initial begin
  state = IDLE;
end

// 定义状态转换逻辑
always @ (posedge clk, posedge reset) begin
  if (reset) begin
    state <= IDLE;
  end else begin
    state <= next_state;
  end
end

// 定义状态操作逻辑
always @ (*) begin
  case (state)
    IDLE:
      if (data_in) begin
        next_state = SEQ_1;
      end else begin
        next_state = IDLE;
      end
    SEQ_1:
      if (!data_in) begin
        next_state = IDLE;
      end else begin
        next_state = SEQ_2;
      end
    SEQ_2:
      if (data_in) begin
        next_state = SEQ_3;
      end else begin
        next_state = SEQ_1;
      end
    SEQ_3:
      if (!data_in) begin
        next_state = SEQ_2;
      end else begin
        next_state = IDLE;
      end
    default:
      next_state = IDLE;
  endcase
end

// 定义输出逻辑
always @ (*) begin
  if (state == SEQ_3) begin
    seq_out = 1;
  end else begin
    seq_out = 0;
  end
end

endmodule

该代码实现了一个简单的序列1010状态机，其中clk是时钟输入，reset是复位输入，data_in是数据输入，seq_out是序列输出。当输入数据符合1010序列时，seq_out会输出1，否则输出0。