20.1.1. Lecture - 21

Try these first

1. 1.

   Define a microinstruction.

   Hint

   Think about the smallest action that can be taken during instruction execution.

2. 2.

   What is a control signal?

   Hint

   Look for the role these signals play in the hardware operations.

3. 3.

   What is the primary advantage of microprogrammed control units over hardwired units?

   • More speed
   • Greater flexibility
   • Lower power consumption

   Hint

   Think about what makes microprogramming better than fixed hardware.

4. 4.

   True or False: Control signals are generated in microprogrammed control units by fixed hardware.

   • True
   • False

   Hint

   Reflect on the nature of microprogrammed control versus fixed systems.

5. 5.

   Design a microprogram for a sequence that includes adding two numbers, then subtracting a third number from the result.

   Hint

   Think about how each operation breaks down into smaller steps.

6. 6.

   Explain how a microprogrammed control unit can adapt to changes in instruction set architecture.

   Hint

   Focus on flexibility and comparisons to hardware changes.