TIDA-00207: TIDA-00207 – MDI Differential Trace Impedance

Hi TI Team,

I was checking the PCB layout files and stackup specifications for (TIDA-00207).

While calculating the differential impedance for the MDI traces between PHY and the isolation magnetics, the calculated differential impedance comes out to approximately 160 ohm instead of 100 Ohm based on the trace dimensions and PCB layer stackup in the design files.

Could you please clarify if am i missing something  in the stackup.

Thanks and regards,

Arijit