📜  单数据路径和管道数据路径之间的差异

📅  最后修改于: 2021-09-27 14:36:16             🧑  作者: Mango

1. 单周期数据路径:
Single Datapaths 相当于原来的单周期 datapath 数据存储器只有一个地址输入。实际的内存操作可以通过 MemRead 和 MemWrite 控制信号来确定。指令和数据有单独的存储器 有 2 个用于基于 PC 的计算的加法器和一个 ALU。控制信号相同。

2. 管道数据路径:
流水线的目标是允许同时执行多条指令。我们可能需要在一个循环中执行多个操作。递增PC并同时添加寄存器。获取一条指令,而另一条指令读取或写入数据。

与单周期数据路径一样,流水线处理器需要复制同一时钟周期所需的硬件元素。

Single Datapath 和 Pilpeline Datapath 之间的差异:

S.No. Single Cycle Datapath Pipleline Datapath
1 Instructions are not subdivided Instructions are divided into one per stage
2 Clock cycles are long enough for the lowest instruction Clock cycles are short but long enough for the lowest instruction
3 There are only 1 instruction that can be executed at the same time. There are as many instructions as pipeline stages
4 There is 1 cycle per instruction, i, e., CPI = 1 There is a fixed number of clock cycles per instruction, one for each pipeline stage, i.e., CPI = k
5 Control unit generates signals for the entire instruction. Control unit generates signals for the entire instruction; these signals are propagated from one pipeline stage to another via the pipeline registers.
6 There is duplicate hardware, because we can use a functional unit for at most one subtask per instruction. There is duplicate hardware, so that there are no restrictions on which instructions can be in the pipeline simultaneously.
7 Extra registers are not required. Extra registers are requeired to provide the results of one pipeline stage to the next pipeline stage.
8 Performance is baseline. Performance is moderately faster to significantly faster than a single cycle.