The 50 MHz shown in Figure 9.18 for the signal CLK is the frequency provided on an FPGA board such as a BASYS2 or NEXYS2 board. The frequency forSLOW_CLK is (50 106)/222 = 11.9209 Hz, or about 12 cycles per second. If this circuit is operated at a slower frequency
it may not function properly because the duration of the signal ONE_PULSE may not be
.. the period of SLOW_CLK. If the circuit is operated too fast, you will not be able to observe
blinking of the LED, which is provided by the signal TWO_PULSES.