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TM4C1294NCPDT: Data discharge in not-connected to phy situation

GR
Expert 2901 points
Part Number: TM4C1294NCPDT

Hi

My customer is testing TM4C1294NCPDT Ethernet(10BASE-T) in Prototype boad.

In test, they want to see by osiloscope data wave in not-connect to PHY situation.

Is there anything way (ex. registor setting) to data discharge in NOT-connecting to LAN?

thanks,

GR

  • 0
    TI__Guru**** 184426 points

    Hi,

      They can use LINKSTAT bit which indicate if there is a valid link established. Other bits will be useful too. 

  • 0 in reply to Charles Tsai
    Expert 2901 points

    Hi Tsai,

    I think the register 73 is Read Only.

    My customer want to set to data discharge in NOT-connecting to LAN.

    Not want to see status of link.

    Is there anything way to data sending in NOT-connecting to LAN?

    thanks,

    GR

  • 0 in reply to GR
    TI__Guru**** 184426 points

    Hi,

      Why don't you try to reset the PHY and that should disconnect from the LAN. 

    SysCtlPeripheralReset(SYSCTL_PERIPH_EPHY);

  • 0 in reply to Charles Tsai
    Expert 2901 points

    Hi Tsai,

    Sorry to I phrased it in a misleading way.

    I used "Data discharge" to data output from PHY to Ethernet Cable.(in Japanese, データ排出/吐出)

    I think you read that mean reset.

    --

    My cutomer want to set TM4C1294 Ethernet for data output (not only link pulse) in not-connect LAN cable to PHY.

    Supplementary information of physical connection in test:

    ・Not connect to LAN.

    ・Only oscilloscope is connected beyond PHY.

    --

    Question:

    1. Is there anything way to set TM4C1294 Ethernet for data output (not only link pulse) in not-connect LAN cable (and not Linked) to PHY.

    thanks,

    GR

  • 0 in reply to GR
    TI__Guru**** 184426 points

    Hi GR-san,

    GR said:

    Question:

    1. Is there anything way to set TM4C1294 Ethernet for data output (not only link pulse) in not-connect LAN cable (and not Linked) to PHY.

    I really don't understand what you mean by "set TM4C1294 Ethernet for data output". Can you give an example of what data output you are referring to? Do you want to use Ethernet pins as GPIO pins after you disconnect PHY from the LAN network?

  • 0 in reply to Charles Tsai
    Expert 2901 points

    Hi Tsai-san,

    Charles Tsai said:
    Do you want to use Ethernet pins as GPIO pins after you disconnect PHY from the LAN network?

    My customer want to see Ethernet 10BASE-T differential-pair signal in osiloscope.

    So I must use Ethernet peripheral MAC and PHY.

    Now, I can see diff-pair signal in connected LAN(Linked).

    But, My customer want to see diff-pair signal(not only Link pulse, include any of data) in not-connected LAN(NOT linked).

    I think my customer want to see like this osiliscope capture(URL).

    https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/558891/tm4c1294-ethernet-testing 

    thanks,

    GR

  • +1 in reply to GR
    TI__Guru**** 184426 points

    Hi,

    GR said:

    So I must use Ethernet peripheral MAC and PHY.

    Now, I can see diff-pair signal in connected LAN(Linked).

    But, My customer want to see diff-pair signal(not only Link pulse, include any of data) in not-connected LAN(NOT linked).

    I think my customer want to see like this osiliscope capture(URL).

     Sorry, you are asking a question that I have not much knowledge at Ethernet physical layer level. So you want to see the Ethernet signals at the wire level. I don't know how to answer your question. Why would you want to look at the differential wire signals? If you are asking for Ethernet PHY compliance, then Amit in the post you refer to has already answered that TM4C129x devices with integrated PHY have passed the electrical compliance test. Sorry for lack of guidance. 

  • 0 in reply to Charles Tsai
    Expert 2901 points

    Hi Tsai-san,

    Thank you to your support.

    I understood.

    thanks,

    GR