6.3.2. Unit 3: Control Signals

Try these first

1. 1.

   What is a control signal?

   Hint

   Think of it as a traffic signal for data flows.

2. 2.

   Name the three stages of the instruction cycle.

   Hint

   What does the CPU do with an instruction?

3. 3.

   What is the primary function of control signals?

   • Manage CPU power
   • Direct the operation of the CPU
   • Control memory allocation

   Hint

   Think of control signals as instruction guides for the CPU.

4. 4.

   The instruction cycle includes which of the following phases?

   • Store
   • Recall
   • Review
   • Fetch
   • Decode
   • Execute
   • Input
   • Process
   • Output

   Hint

   What does the CPU need to do with data?

5. 5.

   Design a control unit for a hypothetical CPU that uses a three-bus architecture. Describe how control signals will be generated.

   Hint

   Consider how each bus will operate simultaneously and how control commands shift based on bus usage.

6. 6.

   Compare the impact of hardwired control units versus micro-programmed control units in terms of flexibility and speed. What are the potential trade-offs?

   Hint

   Think about how changing instructions would affect each design.