20.4.2. Analysis Objective

Try these first

1. 1.

   What is the main difference between a microprogrammed control unit and a hardwired control unit?

   Hint

   Think about speed versus flexibility.

2. 2.

   Can you name a component of a microprogrammed control unit?

   Hint

   Consider the parts that manage control signals.

3. 3.

   What is a microprogram?

   Hint

   Recall the definition we discussed.

4. 4.

   True or False? A microprogrammed control unit is faster than a hardwired control unit.

   • True
   • False

   Hint

   Think about speed trade-offs.

5. 5.

   Design a microprogram for a simplified arithmetic instruction set that includes operations like ADD, SUBTRACT, and LOAD. Specify the control signals needed for each.

   Hint

   Break each arithmetic operation down into its individual steps.

6. 6.

   Evaluate the trade-offs between using a microprogrammed control unit and a hardwired control unit in terms of performance, flexibility, and complexity.

   Hint

   Consider how each unit reacts to changes in instructions.