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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1266317/faq-dp83869hm-how-to-generate-125mhz-on-clkout-pin-for-dp83869
DP83869HM 需要写入一个额外的寄存器来启用 CLKOUT 修改。 默认情况下、该信号是 XI 信号的缓冲版本。 寄存器0xC6必须写入0x10才能使寄存器0x170[12：8]中的值生效。
寄存器0x170[15:8]
