6.3.6. Last 2 Units: Micro Programmed Control Units

Try these first

1. 1.

   What are the three main steps in the instruction cycle?

   Hint

   Think about how a computer processes an instruction.

2. 2.

   What is a micro instruction?

   Hint

   Consider how detailed instructions can be broken down.

3. 3.

   What are micro instructions used for in a control unit?

   • To execute macro instructions
   • To store data
   • To perform specific micro operations

   Hint

   Think of them as the detailed steps in a larger task.

4. 4.

   True or False: Hardwired control units can be easily modified.

   • True
   • False

   Hint

   Consider how hardware design versus software programming works.

5. 5.

   Design a hypothetical micro programmed control unit for a new instruction set that includes addition, subtraction, and logical operations.

   Hint

   Consider the steps involved in each operation and how they might overlap.

6. 6.

   Compare the performance of a hardwired and a micro programmed control unit when executing complex macro instructions with different addressing modes.

   Hint

   Reflect on the implications of modifying and updating control signals.