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  • TI Thinks Resolved

DP83848I-POE-EK: DP83848i

Prodigy 10 points

Replies: 2

Views: 88

Part Number: DP83848I-POE-EK

Hi,

I am trying to use DP83848i in SNI mode to communicate with the processor MC68360.

I got the eval board DP83848I-POE-EK for this Ethernet chip (Schematic attached).

Jumper setting;

J5 MII_MODE = High

J17 SNI_MODE = High

Above both setting enables SNI mode.

PHYAD0 = No jumper(Default internal pulled up)

PHYAD1= No jumper (Default internal pulled down)

PHYAD2= No Jumper (Default internal pulled down)

I can measure 3V at SNI MODE pin but at MII_MODE pin I see ~0V (0.056V to be exact). And MII MODE pin goes High when CRS goes High and goes Low when CRS goes Low.

My question,

1. Is chip really entering to SNI mode? Because MII_MODE pin is not high, it toggles in sync with CRS.

2. How to make MII_MODE pin high all time? (this pin has internal weak pull down)

I am not using MDIO and MDC, my processor doesn't support MDIO and MDC. All setup has to be done through pin configuration.

Any suggestions?

DP83848i-EVAL.pdf

  • Hi Prasan,

    The MII_MODE and SNI_MODE pin have internal PD resistor. The strap voltage on these pins are latched during reset. If you measure after reset, it also depends on how MAC drives the pins.

    Regards,

    Hung Nguyen
  • In reply to Hung Nguyen92:

    Hi Prasan,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. I will go ahead and close this thread.

    If you need further support, kindly open new thread.

    Regards,

    Hung Nguyen

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