Signal diagrams measured on the PHY chip 83822 from TI.

Osciloscope diagrams from the adc-converter

SPI parameters

Every chock creates magnetic field. The pulse frequency reflects to the ground plane causing current disturbances. The easy way is to remove any copper plane underneth the chocke. Here is an example how NOT to route the copper plane underneth the chockes: Red is the top layer, green is the next inner layer. L8 (3V3)…