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pci 有并行总线,pcie 有串行总线。为什么并行总线不能用于pcie但使用串行总线?为什么要转移到pcie的串行总线?
由于每个时钟同步信号,并行总线很难快速。并行信号必须同步发送。另一方面,串行总线可以异步发送信号,因此容易快速。