22.1. Micro-program Control Unit Overview

Try these first

1. 1.

   What is the purpose of control signals in a CPU?

   Hint

   Think about what commands are necessary for executing operations in a CPU.

2. 2.

   Define a micro-program counter.

   Hint

   What keeps track of the instruction sequence being executed?

3. 3.

   What is the function of the micro-program counter (MPC)?

   • It directs control signals
   • It tracks the current instruction address
   • It encodes feedback signals

   Hint

   Think about what component keeps the location of the next instruction.

4. 4.

   The condition select field is used for:

   • True
   • False

   Hint

   Does this field check for conditions influencing program flow?

5. 5.

   Analyze a scenario where a program encounters multiple conditional statements—how would the MCU manage control signals for branching in this case?

   Hint

   Consider how many conditions might exist and what order they're evaluated.

6. 6.

   Propose an optimized design for a micro-program memory that reduces wastage in control signals—what features would it have?

   Hint

   Think about the balance desired between control signal number and memory efficiency.