Section 5.1
Review Questions
Latches
  1. How many bits can a latch store?
answer...
1
  1. Complete the truth table for NOR below. 
          A    B   |  (A+B)'
          ---------+--------
          0    0   |
          0    1   |
          1    0   |
          1    1   |
answer...
A    B   |  (A+B)'
---------+--------
0    0   |    1
0    1   |    0
1    0   |    0
1    1   |    0
  1. Below is a SR latch. There are values on the wires right now. Cross off the 0 on the S wire, change it to 1, and propagate values.
answer...
  1. What is it called when the output of a circuit is recirculated to become part of the input?
answer...
feedback
  1. What do the initials S and R stand for?
answer...
S=set (store the value 1)
R=reset (store the value 0)
  1. Why should we never let S and R both become 1?
answer...
because the circuit will go into an indeterminate state and ultimately store a random value of 1 or 0, we can't control which one
  1. If the S-R latch is put into an indeterminate state, does it stay that way forever?
answer...
No, it will oscillate for a while and then randomly choose 0 or 1
  1. What do we call a circuit that effectively flips a coin and randomly choses 1 or 0?
answer...
arbiter