DP83867IS: About the RX_CLK.

Hi Kengo,

RX_CLK will depend on the mode of operation, so you cannot fix the output unless you are constantly communication in 1000 Mbps mode. See the pin description below from the datasheet from more information.

You can, however, configure the CLK_OUT to output 125 MHZ regardless of the speed. See this thread: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1243072/dp83867is-register-setting-for-125mhz-output-to-clk_out

Best regards,

Melissa