题解 | #含有无关项的序列检测#

很简单的题目，缓存序列，判断前三位和后三位是否符合要求即可。 `timescale 1ns/1ns module sequence_detect( input clk, input rst_n, input a, output reg match );

reg [8:0] sequence;

always @(posedge clk or negedge rst_n) begin
    if (~rst_n) begin
        sequence <= 9'b0;
    end
    else begin
        sequence <= {sequence[7:0],a};
    end
end

always @(posedge clk or negedge rst_n) begin
    if (~rst_n) begin
        match <= 0;
    end
    else if (sequence[8:6] == 3'b011 && sequence[2:0] == 3'b110) begin
        match <= 1;
    end
    else begin
        match <= 0;
    end
end

endmodule