Which of the following do not represent memory reference instruction.

A.	1	opcode		mode = 1, opcode = 010
B.	0	opcode		mode = 0, opcode = 111
C.	1	opcode		mode = 1, opcode = 111
D.	1	opcode		mode = 1, opcode = 110
E.	1	opcode		mode = 1, opcode = 001

Choose the correct answer from the options given below:

The correct answer is Option 2.

Key Points

• A memory reference instruction is one that involves an operation with memory, such as loading data from memory to a register or storing data from a register to memory.
• These instructions generally use an addressing mode and an opcode that corresponds to memory operations.
• In the given options:
  • Option B: mode = 0, opcode = 111 indicates a non-memory reference instruction since mode = 0 typically means no memory reference.
  • Option D: mode = 1, opcode = 110 suggests a memory reference instruction as mode = 1 generally indicates memory reference.

Additional Information

• Memory reference instructions are crucial in computer architecture as they facilitate the movement of data between the CPU and memory.
• Examples of memory reference instructions include LOAD, STORE, and MOVE operations.
• Non-memory reference instructions typically involve operations that do not require memory access, such as arithmetic or logical operations that occur within the CPU.
• Understanding the distinction between memory and non-memory reference instructions is fundamental for computer science students and professionals working with assembly language and computer architecture.