题解 | #含有无关项的序列检测#

module sequence_detect(
    input clk,
    input rst_n,
    input a,
    output reg match
    );

    reg [8:0] seq;
    always @(posedge clk, negedge rst_n)
        begin
            if(!rst_n) seq <= 9'h1ff;
            else seq <= {seq[7:0],a};
        end
    
    always @(posedge clk, negedge rst_n)
        begin
            if(!rst_n) match <=  0;
            else if({seq[8:6],seq[2:0]} == 6'b011110)
                match <= 1;
            else match <= 0;
        end
    
endmodule