But if you use a small board, fly line to the motherboard, the connection method is the same as the motherboard, this time in TX_CLK and RX_CLK can be measured 50Mhz clock;
It was initially suspected whether it was caused by GND, but after discussing with the customer, the customer said that the 811 part of the small board is exactly the same as the main board, and the GND of the two boards is also connected together. When flying the line, there is also a GND line next to it.
I don't know what is the problem, hope to solve it, thank you
