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DP83848I: Questions about DP83848I...

Part Number: DP83848I

Hi Sir,

I have questions about DP83848I, please help.

1. customer use DP83848I MII mode and work well.

    However, after changing the old modem with a new one and they found the DP83848I can't work, all LEDs are off after the cable is plugged but the MCU still working well in their system.

    After software reset DP83848I from MCU, the PHY work finally.

    May I have your comments what kind of problem will cause this issue?

2. customer wants to change from MII to RMII, please help to check if there is any problem with their schematics.

    Is there any in serial resistor necessary for RMII trace? If yes, where is the suggested place? close to PHY or close to MCU or...?

22001a_220210-001.pdf

Thanks.