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MSP430F5529: USB to MDIO - MDC frequency

Vicent Climent14
Intellectual 360 points
Part Number: MSP430F5529

Hello All,

I am trying to connect my MSP430F5 board to an external PHY using the USB to MDIO tool. However I am having some troubles to do so. When I try to "Find PHY ID" I always get "PHY ID X is NOT available". 

I have seen that the frequency of the MDC on MSP430 board is around 300Hz, could this be a problem? would it be able to set this MDC frequency at typical MDIO value of 2.5MHz?

Thanks in advance

Vicent

  • 0
    TI__Genius 10980 points
    Hi Vicent,

    Have you verified that the communication port is open in the GUI? Assuming you have, when you say that you always get "PHY ID X is NOT available," are you seeing this once for each of the 32 PHY IDs that are being pinged? If so, there may be a problem with your PHY or the way that it is connected.

    The source code for this program is not provided, so you will not be able to make firmware changes regarding the MDC, but that also should not be what is causing your problem.

    Regards,
    Nathan
  • 0 in reply to Nathan Siegel
    Intellectual 360 points
    Hi NathanS,

    Your assumption is right, I am able to open the port and connect to the GUI through the USB. I get "PHY ID X is NOT available" for every PHY ID when I go to File->Find PHY ID.

    Regarding the connection, in the user guide is pointed the following:

    "To properly configure the F5 Series, the user will need to remove the 3V3 jumper located between the 5V and RTS jumpers. Connect the desired I/O voltage to the 3V3 header located at J10"

    If my desired voltage is 3V3, can I just leave the 3V3 jumper located between the 5V and RTS jumper? I have seen taht this way the interface is working at 3V3

    BR,
    Vicent
  • 0 in reply to Vicent Climent14
    TI__Genius 10980 points
    Hi Vicent,

    That note in the User's Guide is stating that you need to remove the 3V3 jumper to properly configure the device if you want to use a voltage other than 3.3V. If 3.3V is your desired voltage, then yes, you can and should just leave the 3V3 jumper set. This will power the 3V3 input on the device from the LaunchPad USB connection.

    Regards,
    Nathan

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