f4pga-examples/xc7/timer/modify_count.sv

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`default_nettype none
module modify_count #(
parameter MOD_VALUE = 10
) (
input wire logic clk,
reset,
increment,
output logic rolling_over,
output logic [3:0] count = 0
);
always_ff @(posedge clk) begin
if (reset) count <= 4'b0000;
else if (increment) begin
if (rolling_over) count <= 4'b0000;
else count <= count + 4'b0001;
end
end
always_comb begin
if (increment && (count == MOD_VALUE - 1)) rolling_over = 1'b1;
else rolling_over = 1'b0;
end
endmodule