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DP83867IR: Communication error due to bad signal integrity on RGMII TX side(FPGA to phy)

Part Number: DP83867IR

Hi team,

One of my customer is suffering from communication error in their own board using DP83867IR with 1G mode.

Can you easily review their schematic and PCB layout? I will send them in off-line to i.

Currently, we suspect the signal quality on  RGMII, but please also tell me how we investigate the failure points using register value or something.

Regards,

Takashi Onawa