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TMS320F28388D: is the clock generated with the same pin B12 (called MCU_GPIO154) for the ethernet and EtherCAT port?

Marvin Cantos
Expert 5075 points
Part Number: TMS320F28388D
Other Parts Discussed in Thread: TMDSCNCD28388D, TMS320F28386D-Q1

Hi Team, 

Good day. I am posting this inquiry on behalf of the customer.

"I have a very specific question regarding TMS320F28388DZWTS. Why, in the TMDSCNCD28388D rev B folder in the MCU063B (002) _Sch.PDF file, is the clock generated with the same pin B12 (called MCU_GPIO154) for the ethernet and EtherCAT port?


Assuming you are using EPWM5B?
Could I use respectively the ENET_RMII_CLK pin for the ethernet transceiver and the ESC_PHY_CLK for the two EtherCAT transceivers?
does the pin ENET_RMII_CLK only apply to the RMII standard or also to MII?"

Thank you for extending your help. Your support is much appreciated.

Kind regards, 

Marvin 

  • 0
    TI__Guru 55700 points

    Marvin,

    Marvin Cantos said:

    "I have a very specific question regarding TMS320F28388DZWTS. Why, in the TMDSCNCD28388D rev B folder in the MCU063B (002) _Sch.PDF file, is the clock generated with the same pin B12 (called MCU_GPIO154) for the ethernet and EtherCAT port?

    MCU_GPIO154 is not used to clock the ethernet / etherCAT. It is clocked from P0_25MHz_CLK and P1_25MHz_CLK. If you wish to have MCU_GPIO154 clock both ethernet and etherCAT, you need to remove R30 / R34 and populate R29 and R33

       

    Regards,

    Manoj

  • 0 in reply to Manoj Santha Mohan
    TI__Expert 5075 points

    Hi Manoj, 

    Thank you for your response. Please see the feedback from the customer.

    "Referring to the data sheet tms320f28386d-q1.pdf I note that the pins R29, R30, R33, R34 do not exist. Thinking about this question in these days, I will rephrase the question (more specifically):
    I have decided that I will use ESC_PHY_CLK pin for the two etherCAT transmitters, I am wondering if the ENET_RMII_CLK pin is adequate for an ethernet transmitter and if it can be used without any problems on the firmware plane? maybe I get confused when I read the RMII and the initials MII, is it not the same pheriperal?"

    Thank you for extending your help. Your support is much appreciated.

    Kind regards, 

    Marvin 

  • 0 in reply to Marvin Cantos
    TI__Mastermind 41085 points

    Hi Marvin,

    Marvin Cantos said:
    "Referring to the data sheet tms320f28386d-q1.pdf I note that the pins R29, R30, R33, R34 do not exist.

    Manoj was referring to the resistors on the TMDSCNCD28388D evaluation board (which he provided schematic images of), this wouldn't be in the datasheet.

    Marvin Cantos said:
    I have decided that I will use ESC_PHY_CLK pin for the two etherCAT transmitters

    You can use ESC_PHY_CLK pin, but please note our recommendation from the F2838x TRM section below:

    Marvin Cantos said:
    I am wondering if the ENET_RMII_CLK pin is adequate for an ethernet transmitter and if it can be used without any problems on the firmware plane? maybe I get confused when I read the RMII and the initials MII, is it not the same pheriperal?"

    ENET_RMII_CLK can be used in internal or external clock mode. Please see below from F2838x TRM section. Which mode is the customer wanting to use?

    Best,

    Kevin

  • 0 in reply to Kevin Allen18
    TI__Expert 5075 points

    Hi Kevin, 

    Thank you for your prompt response. Please see the feedback from the customer.

    "Thank you for the precise answers you gave me, they are very helpful.
    I have other questions that deviate from the subject matter of the case. Trying to redraw the ethernet / EtherCAT part of the schematic, I realized that for the ethernet transceiver the pins ENET_REVMII_MDIO_RST, ENET_PPS0, ENET_PPS1 of the TMS320F28388DZWTS are not used; similarly, for the EtherCAT transceivers the pins ESC_LED_STATE_RUN, ESC_LATCH0, ESC_LATCH1, ESC_SYNC0, ESC_SYNC1 of the TMS320F28388DZWTS are not used
    Why are these pins of the TMS320F28388DZWTS not used?
    and what good would they be? I can't find a description anywhere, even a brief one.

    Please help to advise. Thank you for extending your help.

    Kind regards, 

    Marvin

  • +1 in reply to Marvin Cantos
    TI__Mastermind 41085 points

    Hi Marvin,

    Please check the F2838x device TRM Ethernet (EMAC) and EtherCAT sections for further info on these signals and features.

    Marvin Cantos said:
    for the ethernet transceiver the pins ENET_REVMII_MDIO_RST, ENET_PPS0, ENET_PPS1 of the TMS320F28388DZWTS are not used

    I believe these are optional signals and depend on the PHY device being used.

    Marvin Cantos said:
    for the EtherCAT transceivers the pins ESC_LED_STATE_RUN, ESC_LATCH0, ESC_LATCH1, ESC_SYNC0, ESC_SYNC1 of the TMS320F28388DZWTS are not used
    1. STATE LED is not supported on this device. See Table 31-9. 'Status LED Options and Priority' in theF2838x TRM for details.
    2. The LATCH and SYNC signals do not connect to the PHY devices. They can be accessed from the ControlCARDs HSEC connector pins (i.e. accessed at the baseboard).

    Best,

    Kevin