15.1.4. Memory Data Register Operations

Try these first

1. 1.

   What is the function of the Memory Data Register?

   Hint

   Think about what happens just before data moves to/from memory.

2. 2.

   Define indirect addressing.

   Hint

   What does it mean if an address points to another address?

3. 3.

   What does indirect addressing refer to?

   • Direct access to data
   • Data stored in another location
   • Access to CPU registers

   Hint

   Remember the relationship between addresses.

4. 4.

   True or False: Register indirect addressing always executes faster than indirect addressing.

   • True
   • False

   Hint

   Think about the number of accesses involved.

5. 5.

   Explain how the performance of a CPU changes when using indirect vs register indirect addressing in terms of cycle count.

   Hint

   Consider how data retrieval processes differ between methods.

6. 6.

   Compute the potential time savings in execution cycles when switching from indirect to register indirect addressing.

   Hint

   Quantify how direct multiple accesses affect performance.