使用verilog用D触发器实现001序列检测器

首先，需要定义输入和输出端口：

module detector(input clk, input reset, input data, output reg output);

然后，定义一个 D 触发器：

reg d;
always @(posedge clk, posedge reset) begin
    if (reset) begin
        d <= 1'b0;
    end else begin
        d <= data;
    end
end

接着，定义一个状态机来检测序列：

reg [1:0] state;
parameter S0 = 2'b00;
parameter S1 = 2'b01;
parameter S2 = 2'b10;
parameter S3 = 2'b11;

always @(posedge clk, posedge reset) begin
    if (reset) begin
        state <= S0;
        output <= 1'b0;
    end else begin
        case (state)
            S0: begin
                if (d == 1'b0) begin
                    state <= S1;
                end
            end
            S1: begin
                if (d == 1'b0) begin
                    state <= S2;
                end else begin
                    state <= S0;
                end
            end
            S2: begin
                if (d == 1'b1) begin
                    state <= S3;
                end else begin
                    state <= S0;
                end
            end
            S3: begin
                state <= S0;
                output <= 1'b1;
            end
        endcase
    end
end

最后，将输出端口连接到状态机中的输出：

assign output = (state == S3);

完整的代码如下：

module detector(input clk, input reset, input data, output reg output);

    reg d;

    always @(posedge clk, posedge reset) begin
        if (reset) begin
            d <= 1'b0;
        end else begin
            d <= data;
        end
    end

    reg [1:0] state;
    parameter S0 = 2'b00;
    parameter S1 = 2'b01;
    parameter S2 = 2'b10;
    parameter S3 = 2'b11;

    always @(posedge clk, posedge reset) begin
        if (reset) begin
            state <= S0;
            output <= 1'b0;
        end else begin
            case (state)
                S0: begin
                    if (d == 1'b0) begin
                        state <= S1;
                    end
                end
                S1: begin
                    if (d == 1'b0) begin
                        state <= S2;
                    end else begin
                        state <= S0;
                    end
                end
                S2: begin
                    if (d == 1'b1) begin
                        state <= S3;
                    end else begin
                        state <= S0;
                    end
                end
                S3: begin
                    state <= S0;
                    output <= 1'b1;
                end
            endcase
        end
    end

    assign output = (state == S3);

endmodule