8.1.2. Instruction Fetching

Try these first

1. 1.

   What does the program counter do?

   Hint

   Think about what the CPU needs to know to fetch instructions.

2. 2.

   What is clock grouping?

   Hint

   Consider how timing can optimize instruction fetches.

3. 3.

   What does the program counter do in the instruction fetching process?

   • Stores the instruction
   • Provides the address of the next instruction
   • Controls the clock speed

   Hint

   Think about what direction the CPU needs to go next.

4. 4.

   True or False: Clock grouping optimizes the instruction fetching process by allowing all operations to occur at once.

   • True
   • False

   Hint

   Consider how dependency affects timing.

5. 5.

   Design a hypothetical instruction fetch cycle for an instruction requiring both immediate and non-immediate addressing modes. Outline each micro-instruction step involved.

   Hint

   Think about how to alternate between direct data accesses and fetching from memory.

6. 6.

   Create a detailed flowchart depicting the instruction fetching process illustrating clock grouping.

   Hint

   Consider how each step connects and where timing optimizations may occur.