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DS50PCI401: Trace differential impedance design

Guru 19775 points
Part Number: DS50PCI401

Hi Team,

Please allow me to ask you the PCB design of the high speed line.

In the data sheet, it states input/output differential impedance is 100 ohm and is recommending to use controlled diffrential impedance of 100 ohm (TYP).

On the other hand, PCIe Gen2 CEM recommends to use controlled differential impedance of 85 ohm (TYP).

Which impedance design is your recommendation for this application ?

Best Regards,

Kawai