i.MX8 Quad Max impedance of PCIE and SATA

[anon-696f160ab2]

For i.MX8 Quad Max there is only one pin for setting the impedance of PCIE and SATA: PCIE_REXT

As SATA and PCIE using different differential impedance i think there is no "optimum" for the impedance.

What is the recommendation for PCIE_REXT when using two PCIE-Lanes and one SATA.?

Can we use 85 Ohm for driver but routing with 100 Ohm from SATA specification?

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[igorpadykov · Accepted solution]

Hi Martin

preliminary document with routing recommendations was sent via mail.

Best regards
igor
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[anon-696f160ab2]

Thanks igor, I answered your email, as it wasnt helpful at the moment.

[igorpadykov]

Hi Martin

this part is not officially released yet and not supported. Suggest to

apply to nxp local marketing office for additional support.

Best regards
igor

[RossMcLuckie]

For the case of PCIe plus SATA use 85-ohm value, BSP SATA driver adjusts PHY register to compensate.

Regards

Ross