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Differences between the Dual PHYTER DP83849IF(VS) und DP83849ID(VS)

Michael Wagner72
Prodigy 120 points
Other Parts Discussed in Thread: DP83849ID, DP83849IF

Hello,

I have some questions about the Dual PHYTER DP83849. 

Where is the difference between the Dual PHYTER DP83849IF(VS) und DP83849ID(VS) ?

According to the datasheet, the DP83849IF(VS) supports the "Extender Mode". Does the PHY then work as a media converter?

Does the DP83849ID(VS) also support the EXTENDER MODE? I don’t find any information about an extender mode in the datasheet of the DP83849ID(VS).

In addition some information about our application:

-         We want to use the PHY as a media converter to convert the ethernet signals from IEE standard “TX” (electrical) to IEE standard “FX” (optical)

-         On PORT A (TX), a RJ45 is connected

-         On PORT B (FX), an optical transceiver is connected

Thanks for your help. I hope my english is understandable, i'm from germany. 

  • 0
    TI__Mastermind 31600 points
    Michael,

    The DP83849IF supports extender mode and media converter mode but the DP83849ID does not. These features are what differentiates these products.

    We have an application note on the flexible port configuration of the DP83849IF on the "Technical documents" tab of the product folder. For your convenience, the direct link to the application note is:
    www.ti.com/.../snla086

    We also have a reference design for using the DP83849IF as a media converter. The details can be found on the "Tools & software" tab of the DP83849IF product folder:
    www.ti.com/.../toolssoftware

    I believe you described your needs quite well. Your English is perfect. Please let us know if there is anything else we can do to help.

    Patrick
  • 0 in reply to Patrick OFarrell
    Prodigy 120 points

    Hello Patrick,

    thank you very much for your answer. We tried to use the DP83849IFVS as an Media Converter by putting the Pin EXTENDER_EN on high level (2.2k pull up to 3.3V). We also did some configurations with the Pins AN_EN, FX_EN and so on. Like its described in the Application Note / Datasheet. 

    My question is: Is it necessary to do some configuration of the registers to let the PHY work as a media converter? We have a MSP430 LaunchPad where we can read/write the registers of the PHY with the software USB2MDIO. Or is it enough to do the right configuration with high/low levels at the input pins of the PHY? 

    Thanks for your help.

    Michael

  • 0 in reply to Patrick OFarrell
    Prodigy 120 points

    Once again, hello Patrick,

    We tried to use the Media Converter Mode only with configuring via strap. 

    I will attach a picture of our schematic. The resistors have a value of 2.2k. We tried to configure Port B as FX operation (Pin 59) and enable the Extender Mode (Pin 56), by putting it over a pull up to 3.3V. Port A was left by default, so TX (copper). 

    When putting the board to supply voltage, the voltage at EXT_EN (Pin 56) is 0 (GND). Also the voltage at Port B: FX_EN (Pin 59) is 0 (GND).

    If we give a reset signal to the PHY, the voltage at both, EXT_EN (Pin 56) and FX_EN (Pin 59) is 3.3V. So the layout is correct and the pull up resistors work correctly, but the PHY pulls down the voltage to GND if we stop the reset. 

    Maybe we did something wrong with the leds? Or do you have any other idea where we could have made a mistake? If it's helpful we can also send you the whole schematic.

    Thank you for your help!

    Michael

  • 0 in reply to Michael Wagner72
    TI__Mastermind 23675 points
    Hi Michael,

    I see that you already have a thread open. Please only ask on the open thread.
    This helps reduce confusion. Also, multiple threads makes it difficult to figure out if a question has been answered or not.

    Kind regards,
    Ross
  • 0 in reply to Ross Pimentel
    Prodigy 120 points
    Hi Ross,
    sorry for opening two threads. Thanks for your help!
    Michael