20.3. Micro-programmed Control Units

Try these first

1. 1.

   What is a micro-programmed control unit?

   Hint

   Think about the flexibility it offers compared to hardwired control.

2. 2.

   Define a micro instruction.

   Hint

   What is its role in relation to macro instructions?

3. 3.

   What is the primary function of a micro-programmed control unit?

   • Generate fixed signals
   • Store control signals
   • Generate control signals dynamically

   Hint

   Consider how it contrasts with hardwired units.

4. 4.

   True or False: Micro instructions are equivalently high-level operations like 'LOAD' or 'STORE'.

   • True
   • False

   Hint

   Reflect on the relationship between the two types of instructions.

5. 5.

   Design a simple micro-programmed sequence to perform an addition operation. Detail the micro instructions and control signals involved.

   Hint

   Focus on breaking down the addition into basic steps according to the micro programming model.

6. 6.

   Explain how a change in the micro-program affects the control unit's operations in a real-time scenario.

   Hint

   Think about how the flexibility of micro programming can improve the CPU's performance.