13.1.2. Stage 2: Memory Read

Try these first

1. 1.

   What does the program counter (PC) do?

   Hint

   Think of it as the bookmark in your instruction book.

2. 2.

   What is contained in the instruction register (IR)?

   Hint

   It's what the CPU is currently working on.

3. 3.

   What is the first task the CPU performs in the memory read stage?

   • Increment the program counter
   • Load data into the memory data register
   • Output results to RAM

   Hint

   Think about which step initiates the fetch process.

4. 4.

   True or False: The instruction register (IR) holds the current instruction being executed.

   • True
   • False

   Hint

   Remember what happens after the instruction is fetched from memory.

5. 5.

   Design a flowchart to illustrate the memory read process, detailing each control signal's role.

   Hint

   Start from the top of the flowchart with 'Increment PC' and work down for logical flow.

6. 6.

   Explain how the memory read process could be affected by a malfunctioning control signal.

   Hint

   Consider scenarios where control signals dictate actions like a traffic light malfunction.