verilog实现一个5bit序列检测器

简单同学2024-10-27 16:33

以下是用 Verilog 实现一个 5bit 序列检测器的代码：

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module five_bit_sequence_detector(
    input clk,
    input reset,
    input [4:0] in,
    output reg detected
);

    // 定义状态参数
    localparam IDLE = 4'b0000;
    localparam STATE1 = 4'b0001;
    localparam STATE2 = 4'b0010;
    localparam STATE3 = 4'b0011;
    localparam STATE4 = 4'b0100;
    localparam DETECTED_STATE = 4'b0101;

    reg [3:0] current_state;
    reg [3:0] next_state;

    always @(posedge clk or posedge reset) begin
        if (reset) begin
            current_state <= IDLE;
            detected <= 1'b0;
        end else begin
            current_state <= next_state;
            if (current_state == DETECTED_STATE)
                detected <= 1'b1;
            else
                detected <= 1'b0;
        end
    end

    always @(*) begin
        case (current_state)
            IDLE:
                if (in == 5'b00001)
                    next_state = STATE1;
                else
                    next_state = IDLE;
            STATE1:
                if (in == 5'b00010)
                    next_state = STATE2;
                else
                    next_state = IDLE;
            STATE2:
                if (in == 5'b00100)
                    next_state = STATE3;
                else
                    next_state = IDLE;
            STATE3:
                if (in == 5'b01000)
                    next_state = STATE4;
                else
                    next_state = IDLE;
            STATE4:
                if (in == 5'b10000)
                    next_state = DETECTED_STATE;
                else
                    next_state = IDLE;
            DETECTED_STATE:
                if (in == 5'b10000)
                    next_state = DETECTED_STATE;
                else
                    next_state = IDLE;
            default:
                next_state = IDLE;
        endcase
    end

endmodule

这个序列检测器检测特定的 5bit 序列 "00001"、"00010"、"00100"、"01000"、"10000"。当输入序列与这个特定序列匹配时，输出 detected 被置为高电平。状态机从初始状态 IDLE 开始，根据输入逐步进入不同的状态，直到检测到完整序列进入 DETECTED_STATE。如果在任何状态下输入不匹配预期序列，状态机将回到 IDLE 状态重新开始检测。