15. Indirect Mode
The chapter discusses various addressing modes in computer architecture, focusing on their mechanisms and processes for executing instructions. Key modes such as immediate, direct, indirect, and register indirect are explained, illustrating the control stages involved in loading operands. The comparative efficiency of these modes is highlighted, particularly the differences in the number of steps required for data retrieval and instruction execution.
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What we have learnt
- Different addressing modes have varying complexities and efficiency in instruction execution.
- The stages involved in loading and executing instructions can differ significantly based on the addressing mode employed.
- Understanding each addressing mode is crucial for designing effective instructional formats within a CPU architecture.
Key Concepts
- -- Addressing Modes
- Techniques to specify operand addresses in computer instructions, which influence how instructions fetch and operate on data.
- -- Indirect Addressing
- A mode where the address of the operand is specified in a memory location, requiring additional steps to fetch the required data.
- -- Register Indirect Mode
- An addressing mode where a register contains the address of the operand, resulting in fewer stages required for instruction execution compared to memory indirect.
- -- Memory Buffer Register (MBR)
- A register that holds data temporarily while it is being transferred between the CPU and memory.
- -- Memory Address Register (MAR)
- A register that holds the address of the memory location to be accessed.
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