2300610_en-US

[#1]

S32G3 PFE EMAC and XPCS Setup

Dear support team,

our customer Magna is facing a critical issue with the Ethernet setup for the upcoming Audi demo this week. Below are the system details and current findings.

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System Setup

• PFE EMAC0: 1 Gbit SGMII → connected to Broadcom switch port 14, auto‑negotiation enabled
• PFE EMAC1: 1 Gbit SGMII → connected to Broadcom switch port 8, auto‑negotiation enabled
• Broadcom switch is powered up and started by S32G via external control signals once PFE and SERDES initialization is completed.

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Current Findings

Clocking

• Clock configuration seems correct. Lauterbach scripts confirm the CMU frequency ranges are as expected.

Internal Loopback

• EMAC0 internal loopback operates correctly.
  • TX counters at 0x460A0714 and 0x460A0718 increase
  • RX counter at 0x460A0780 increases
• Promiscuous mode must be enabled to achieve TX → RX loopback behavior.

Link Negotiation

• Auto‑negotiation is enabled on both S32G and Broadcom switch side.

External Path Loopback (through Broadcom)

• Loopback via Broadcom switch is not functional.
• On EMAC0, RX counter at 0x460A0780 does not increase, indicating the S32G receives no data from the switch.

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Planned / Ongoing Actions

• Magna will perform hardware‑level signal measurements on the SGMII lanes.
• NXP will re‑verify the configuration with both EMAC0 and EMAC1 active at 1 Gbit SGMII.

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Request

We urgently need support from your side to:

1. Identify the root cause of the missing external communication.
2. Validate or provide corrected SGMII / SERDES / PFE configuration for S32G when using:
   • EMAC0 + EMAC1 simultaneously
   • 1 Gbit SGMII
   • Auto‑negotiation enabled (may be also disabled?)

A robust, working configuration is urgently required ASAP to secure Magna’s Audi demo this week.

Best Regards,

Viktor

XPCS dump - see attached.

PFEPFE MCALPriority: CRITICALSource: Direct CustomerRe: S32G3 PFE EMAC and XPCS Setup

Mcu, Serdes and Eth_43_PFE configuration was validated for EMAC0 only. The configuration was valid and working for EMAC0 connected to PHY in SGMII 1Gbps mode.

It was determined on debug call, that auto-negotiation between Serdes and Broadcom switch (direct SGMII connection) is not working.

When auto-negotiation was disabled on both sides, the link was up and Ethernet traffic was working in both directions. Root cause of failing auto-negotiation was not determined as the auto-negotiation is not required for customer application.