题解 | #含有无关项的序列检测#
含有无关项的序列检测
https://www.nowcoder.com/practice/cba67d06d6834a5d9b93e1087b56c8d8
含有无关项的序列检测，相对于固定序列，判断时，按位判断即可满足组题意。
`timescale 1ns/1ns
module sequence_detect(
input clk,
input rst_n,
input a,
output reg match
);
reg [8:0] r_a;
always@(posedge clk or negedge rst_n)begin
if(!rst_n)begin
r_a <= 9'b1_1111_1111;
end
else begin
r_a <= {r_a[7:0],a};
end
end
always@(posedge clk or negedge rst_n)begin
if(!rst_n)begin
match <= 1'b0;
end
else if ((r_a[8:6] == 3'b011) && (r_a[2:0] == 3'b110))begin
match <= 1'b1;
end
else begin
match <= 1'b0;
end
end
endmodule
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