13.1.6. Stage 6: Complete Instruction Execution

Try these first

1. 1.

   What does the Instruction Register (IR) hold?

   Hint

   Think about what happens right after an instruction is fetched.

2. 2.

   What is the role of the Program Counter (PC)?

   Hint

   What keeps track of which instruction will be executed next?

3. 3.

   What is the primary function of the Instruction Register?

   • Holds the current instruction
   • Stores data temporarily
   • Increments the program counter

   Hint

   What part of the CPU directly deals with executing commands?

4. 4.

   Control signals are used to coordinate CPU operations. True or False?

   • True
   • False

   Hint

   Think about what ensures orderly processing of multiple tasks.

5. 5.

   Design a detailed overview of how the CPU handles fetching the instruction to execute 'SUB R2, R3', and explain the role of each register involved in the process.

   Hint

   Break down the steps one by one focusing on what happens at each stage.

6. 6.

   Evaluate the efficiency impacts of using registers over memory access in CPU operations observable in 'LOAD R1, M' vs 'ADD R2, R3'. How does this affect execution time?

   Hint

   Consider how often each operation accesses memory to weigh the execution time differences.