13.1. Instruction Fetch and Execution

Try these first

1. 1.

   What does the Program Counter do?

   Hint

   Think about the next step in instruction processing.

2. 2.

   Which register temporarily holds data from memory during instruction fetch?

   Hint

   Its name indicates it deals with data from memory.

3. 3.

   What is the main purpose of the Program Counter?

   • Hold data
   • Track memory addresses
   • Increment as needed

   Hint

   Think about what it manages.

4. 4.

   Is it true that the Memory Data Register holds data currently fetched from memory?

   • True
   • False

   Hint

   Consider the MDR's role during fetching.

5. 5.

   Design a flowchart for the instruction fetching process in a CPU, including all control signals.

   Hint

   Break down each stage as a step in a sequence.

6. 6.

   Given specific instructions, outline the fetching and execution phases for a 'SUB' instruction.

   Hint

   Follow an organized step-by-step approach.