i.MX8 Quad Max impedance of PCIE and SATA

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i.MX8 Quad Max impedance of PCIE and SATA

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anon-696f160ab2
Senior Contributor I

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
NXP Employee
NXP Employee

Hi Martin

preliminary document with routing recommendations was sent via mail.

Best regards
igor
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igorpadykov
NXP Employee
NXP Employee

Hi Martin

preliminary document with routing recommendations was sent via mail.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

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anon-696f160ab2
Senior Contributor I

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

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igorpadykov
NXP Employee
NXP Employee

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

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RossMcLuckie
NXP Employee
NXP Employee

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

Regards

Ross

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