A series of digital bits are driven from a digital pin card at a rate of 1 MHz (1-μs period). The series of bits are 10110X1. The format for this pin is set to return-to-zero (RZ) format. Its initial state is set to logic low. The start time for the drive data is set to 500 ns, and the stop time is set to 900 ns. Draw this waveform using the notation in Figure 2.8. Draw the waveform timing approximately to scale. Next, draw the waveform that would result if we set the format to non-return-to-zero (NRZ). To produce these waveforms using clocked digital logic without timing and formatting circuits, what clock rate would be required? If we wanted to be able to set the start and stop times to 500 ns and 901 ns, respectively, at what rate would we have to operate the clocked digital logic?