module tick_div4(
input wire clk,
input wire rst,
output reg tick
);
reg [1:0] cnt;
always @(posedge clk) begin
if (rst) begin
cnt <= 0;
tick <= 0;
end else begin
// STEP 1: Decide tick
if (cnt == 3)
tick <= 1; // 4th clock tick
else
tick <= 0;
// STEP 2: Update counter
if (cnt == 3)
cnt <= 0; // back to 0
else
cnt <= cnt + 1;
end
end
endmodule