15.2.3. Timing and Steps Involved

Try these first

1. 1.

   What is the primary function of the Instruction Register?

   Hint

   Think about what an instruction register stores during CPU operation.

2. 2.

   How many stages are typically required for memory indirect addressing?

   Hint

   Consider how many memory accesses take place.

3. 3.

   In indirect addressing, how is the operand accessed?

   • Directly through its memory address
   • Using another address
   • By using a constant value

   Hint

   Think about how an address reference is made.

4. 4.

   True or False: Memory Indirect Addressing typically requires more stages than Register Indirect Addressing.

   • True
   • False

   Hint

   Consider how many accesses are needed for each type.

5. 5.

   Design a sequence to execute an indirect load instruction from memory to a register. Explain each step including addressing mode.

   Hint

   Trace through the steps carefully to ensure all stages are accounted for.

6. 6.

   Analyze the performance impact of choosing indirect addressing over direct addressing in a loop iteration scenario.

   Hint

   Quantify the time taken for multiple loop executions to illustrate your point.