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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1412855/faq-ds320pr1601-do-ti-pcie-redrivers-require-a-pcie-reference-clock-for-operation
工具与软件：
TI PCIe 转接驱动器是否需要 PCIe 参考时钟(REFCLK)才能运行？
不需要、TI 的 PCIe 转接驱动器不需要100MHz PCIe 参考时钟(REFCLK)即可运行。
这可以实现更灵活的 REFCLK 布线注意事项和拓扑、例如单独的参考时钟拓扑。
