Explain the principle of a pipelined processor architecture.

The processor pipeline architecture (pipeline) is a method of organizing command execution, where the processor breaks down instruction execution into several stages (for example, fetch, decode, execute, memory access, write-back) and processes multiple instructions simultaneously at different stages.

Working principle:

• Each instruction passes through several sequential stages.
• In each clock cycle, the processor processes part of an instruction at one stage, and in the next cycle — the next part.
• This achieves parallelism: while one instruction is being decoded, another is being executed, a third is writing back results, and so on.

This increases performance by raising the number of instructions processed per unit of time.

Example: if the pipeline consists of 5 stages, then after filling the pipeline, the processor can issue one completed instruction per cycle, even though each instruction requires 5 cycles for complete execution.