21.2.2. Memory Organization of Micro-Programs

Try these first

1. 1.

   What does a micro-program contain?

   Hint

   Think about the role micro-instructions play in executing larger instructions.

2. 2.

   What is the purpose of a micro-program counter?

   Hint

   Consider how a counter helps manage sequences.

3. 3.

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

   • Generate control signals in sequence
   • Store macro instructions
   • Execute arithmetic operations

   Hint

   Refer back to the definition of micro-programmed control units.

4. 4.

   True or False: The micro-program counter only increments under normal circumstances.

   • True
   • False

   Hint

   Consider when the MPC might not move to the next instruction.

5. 5.

   Design a hypothetical micro-progam sequence that handles a conditional branch depending on whether a specific flag is set. What assumptions are you making?

   Hint

   Consider how existing flags might affect subsequent instructions.

6. 6.

   Explain how a poorly organized micro-program memory could lead to inefficiencies. Propose a restructuring to resolve these issues.

   Hint

   Look at existing organization and think of how a more dynamic approach might mitigate problems.