Section 5.4
Review Questions
Flip-flops
  1. How many bits does a single flip-flop store?
answer...
1
  1. Which term applies to flip-flops? 
          level-triggered                edge-triggered
answer...
edge-triggered
  1. Draw the schematic for a clocked D flip-flop.
answer...
  1. When does a flip-flop change to its new value, on the rising edge of the voltage signal or on the falling edge?
answer...
could be either, depends on the transistor technology. Within a particular transistor technology, though, it always switches on either the rising edge or the falling edge, never both, and not randomly.
  1. Why are flip-flops better than latches?
answer...
they avoid timing problems and are more stable
  1. What is unrealistic about the following digital waveform?
answer...
no wave is perfectly square because voltage cannot change instantaneously.