counter\cntr.v
.......\cntr_modulus.v
.......\cntr_modulus_la.v
.......\cntr_updn.v
.......\counter_tb.v
.......\gray_cntr.v
.......\gray_cntr_la.v
.......\gray_cntr_tb.v
.......\seconds_counter.v
.......\seconds_counter_tb.v
.......\system_timer.v
.......\system_timer_tb.v
counter