Section 7.7
Review Questions
The structure of the control unit
  1. What does DFA stand for?
  1. In DFAs, nodes represent _____________________ and arcs represent _____________________.
  1. How many arcs can come out of any one node?
  1. What circuit or component does a DFA simplify?
  1. Label the control DFA for the CSC-1 with the phases of the instruction cycle. The execute phase is shown for you already. 
               Execute
               Fetch instruction from memory
               Start cycle; copy PC into MAR
               Operand fetch
               Save instruction into IR register
  1. Why must the operation decoder take in the first 8 bits of the IR register? Why not just the first four, since that is where the opcode is?
  1. Which circuit or component keeps the control unit moving from one state to the next on a regular basis?
  1. What does Hz stand for?
  1. What does 120 MHz mean?