The life cycle of an instruction in a computer system involves several stages. Here is a detailed step-by-step explanation:

1. **Fetch**: The first step in the life cycle of an instruction is the fetch operation. The processor fetches the instruction from the main memory. The address of the instruction is stored in the Program Counter (PC). The PC is then incremented to point to the next instruction.

2. **Decode**: Once the instruction is fetched, it is decoded by the instruction decoder. The decoder interprets the instruction and generates control signals for the other parts of the processor. The instruction may also be checked for any errors during this stage.

3. **Evaluate Address**: If the instruction involves data stored in memory, the processor calculates the address of the data. This is done by the effective address calculator.

4. **Fetch Operands**: If the instruction requires data from memory, the data is fetched during this stage. The data may be fetched from the cache or the main memory, depending on where it is stored.

5. **Execute**: The actual operation indicated by the instruction is performed during this stage. This could be an arithmetic operation, a logical operation, a control operation, or a data transfer operation.

6. **Store Result**: The result of the operation is stored back in the memory or in a register, depending on the instruction.

7. **Write Back**: The final step in the life cycle of an instruction is the write back operation. The results of the operation are written back to the memory or the register file.

This cycle repeats for each instruction in the program until the program is completed. The speed at which these steps can be performed is a major factor in the performance of a computer system.

Question

The life cycle of an instruction in a computer system involves several stages. Here is a detailed step-by-step explanation:

1. **Fetch**: The first step in the life cycle of an instruction is the fetch operation. The processor fetches the instruction from the main memory. The address of the instruction is stored in the Program Counter (PC). The PC is then incremented to point to the next instruction.

2. **Decode**: Once the instruction is fetched, it is decoded by the instruction decoder. The decoder interprets the instruction and generates control signals for the other parts of the processor. The instruction may also be checked for any errors during this stage.

3. **Evaluate Address**: If the instruction involves data stored in memory, the processor calculates the address of the data. This is done by the effective address calculator.

4. **Fetch Operands**: If the instruction requires data from memory, the data is fetched during this stage. The data may be fetched from the cache or the main memory, depending on where it is stored.

5. **Execute**: The actual operation indicated by the instruction is performed during this stage. This could be an arithmetic operation, a logical operation, a control operation, or a data transfer operation.

6. **Store Result**: The result of the operation is stored back in the memory or in a register, depending on the instruction.

7. **Write Back**: The final step in the life cycle of an instruction is the write back operation. The results of the operation are written back to the memory or the register file.

This cycle repeats for each instruction in the program until the program is completed. The speed at which these steps can be performed is a major factor in the performance of a computer system.

Knowee AI · Accepted Answer