S32G3 GMAC0 and PFE_MAC1 SGMII mode

[XD]

Hello,

If I configure GMAC0 and PFE_MAC1 to use SGMII (1G), does that mean both interfaces will utilize SerDes pins for external communication, allowing their respective dedicated pins (e.g., gmac_tx0, gmac_tx1, etc.) to be reassigned to other interfaces? Additionally, if GMAC0 is configured for SGMII, can I still use the GMAC_PPS pin for PPS output? Similarly, if PFE_MAC1 is set to SGMII, can I still connect its PPS pin to another module?

Thanks,

XD

[Celeste_Liu]

Dear @XD ,
I apologize for the late response.
I would like to know whether you are using the reference board or a customized board. The answers to your questions may vary depending on this.

Best regards,
Celeste

[XD]

Hi Celeste,

Thank you for your response.

We are designing our own board, using the RDB3 reference design as a reference. Our plan is to configure both GMAC0 and PFE_MAC1 to operate in SGMII mode.

Thanks,

XD

[Celeste_Liu · Accepted solution]

Hi @XD ,

Thank you for your answer. As per your questions:
[Q1]: If I configure GMAC0 and PFE_MAC1 to use SGMII (1G), does that mean both interfaces will utilize SerDes pins for external communication, allowing their respective dedicated pins (e.g., gmac_tx0, gmac_tx1, etc.) to be reassigned to other interfaces?
[A1]:Given that you are designing a customized board, I recommend you refer to the document "User guide S32G3 Hardware Design Guidelines". S32G3 has two SerDes instances, each SerDes instance has a mux option between PCIe and SGMII. The following mux option can be chosen on the SerDes channels.

In addition, I have checked the S32G3 IOMUX Sheet. Regarding your question, I believe it is correct.
[Q2]: Additionally, if GMAC0 is configured for SGMII, can I still use the GMAC_PPS pin for PPS output? Similarly, if PFE_MAC1 is set to SGMII, can I still connect its PPS pin to another module?
[A2]: Likewise, the answer is yes.

For more details, you can refer to Chapter 53 SerDes Subsystem of the S32G3 Reference Manual. The S32G3 SerDes Subsystem Reference Manual is also recommended.

I hope the above answers can solve your confusion.

Best regards,

Celeste

[XD]

Thank you for the explanation, Celeste!

Thanks,

XD