`default_nettype none

module mod_counter #(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