module tick_div4 (
input wire clk,
input wire rst,
output reg tick
);
reg [1:0] cnt; // Bộ đếm 2 bit (0 → 3)
always @(posedge clk) begin
if (rst) begin
cnt <= 2'd0;
tick <= 1'b0;
end else begin
cnt <= cnt + 2'd1;
tick <= (cnt == 2'd3);
end
end
endmodule