22.2. Control to Micro-program Counter

Try these first

1. 1.

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

   Hint

   Think about what the MPC is responsible for in instruction execution.

2. 2.

   How does a multiplexer (MUX) operate in the control unit?

   Hint

   Consider situations where you have multiple choices in a device.

3. 3.

   What does the MPC do when instructed to jump to address '101'?

   • Load 101
   • Increment to 102
   • Do nothing

   Hint

   Remember how loading works in condition checks.

4. 4.

   True or False: The MPC automatically increments if no conditions are met.

   • True
   • False

   Hint

   Consider what happens when conditions for decision-making are absent.

5. 5.

   If the MPC starts at address '002', and the control signal indicates to load '005', what will the MPC do, and how do the control signals influence this decision?

   Hint

   Consider the actions dictated by control signals.

6. 6.

   Design a simple pseudo-code to demonstrate how an MPC would operate through a loop until a certain condition (like a counter reaching 5) is met, and illustrate how signals change through each iteration.

   Hint

   Think about an analogy where a driver loops until a destination is reached.