用状态机实现110101序列检测的verilog代码

下面是使用状态机实现110101序列检测的verilog代码：

module sequence_detector(
    input clk, rst, in,
    output reg out
);

// 定义状态
parameter IDLE = 2'b00;
parameter S1 = 2'b01;
parameter S2 = 2'b10;
parameter S3 = 2'b11;

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

// 初始化状态寄存器和下一个状态寄存器
initial begin
    state = IDLE;
    next_state = IDLE;
end

// 定义状态转移逻辑
always@(posedge clk, posedge rst) begin
    if(rst) begin
        state <= IDLE;
        next_state <= IDLE;
    end
    else begin
        state <= next_state;
        case(state)
            IDLE: if(in == 1'b1) next_state = S1;
                  else next_state = IDLE;
            S1: if(in == 1'b1) next_state = S1;
                else next_state = S2;
            S2: if(in == 1'b0) next_state = S2;
                else next_state = S3;
            S3: if(in == 1'b1) next_state = IDLE;
                else next_state = S2;
            default: next_state = IDLE;
        endcase
    end
end

// 定义输出逻辑
always@(state, in) begin
    case(state)
        IDLE: out = 1'b0;
        S1: out = 1'b0;
        S2: out = 1'b0;
        S3: out = 1'b1;
        default: out = 1'b0;
    endcase
end

endmodule

这个代码使用了四个状态来实现序列的检测。通过组合逻辑来确定下一个状态，再通过状态转移逻辑来更新状态寄存器和下一个状态寄存器。输出逻辑根据当前状态来确定输出值。