15.4.2. Preview of Next Unit

Try these first

1. 1.

   What does indirect addressing refer to?

   Hint

   Think about how addresses can be linked.

2. 2.

   Name one advantage of register indirect mode.

   Hint

   Consider what it simplifies in terms of access.

3. 3.

   What is indirect addressing?

   • Directly specified operand address
   • Address determined through another location
   • None of the above

   Hint

   Think about how addresses can point to other addresses.

4. 4.

   True or False: Register indirect addressing requires two memory accesses.

   • True
   • False

   Hint

   Review how we access addresses in register versus memory.

5. 5.

   Design a CPU architecture diagram incorporating both memory and register indirect addressing. Explain how each part operates in stepwise detail.

   Hint

   Use different colors for registering indirect stages versus memory indirect stages.

6. 6.

   Given an instruction LOAD R1, R2 where R2 indirectly references a memory address, write down how many stages are required for fetching R1's value.

   Hint

   Map the instruction to its respective steps.