• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 151 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DP83TD510E: design question

[FAE] Andrew Wang
Genius 10685 points
Part Number: DP83TD510E

Hi Team,

Customer has some quick question when design this device, thanks for help.

1) As shown in yellow highlight, when using RMII slave mode,  do we still need external pull down？Or this is internal pull down, and we can leave it float, thx.

2) Assume we set to RMII slave mode, and providing reference clock 50MHz to Pin10 from MAC. What to do with Pin30, floating it? Thx.

3) When using RMII interface for data communication, what is best to do with Pin21, assume we don't want any MCU to be involved. Thx.

This term 'power down' meaning entire PHY device power down?

Or certain block inside the device, thx!

Andrew

  • 0
    TI__Mastermind 19250 points

    Hi Andrew,

    Please find my responses below.

    1) As shown in yellow highlight, when using RMII slave mode,  do we still need external pull down? Or this is internal pull down, and we can leave it float, thx.

    [Gokul]: We don't to do add any external pull down. We can leave this pin floating. There is an internal pull down enabled on this pin in RMII Slave mode.

    2) Assume we set to RMII slave mode, and providing reference clock 50MHz to Pin10 from MAC. What to do with Pin30, floating it? Thx.

    [Gokul]: Pin 30 is an output and you leave this pin floating

    3) When using RMII interface for data communication, what is best to do with Pin21, assume we don't want any MCU to be involved. Thx.

    This term 'power down' meaning entire PHY device power down?

    Or certain block inside the device, thx!

    [Gokul]: The entire PHY is powered down when this pin is driven low. We can either add a pull-up resistor on this pin or leave it connected.

    --
    Regards.
    Gokul.

  • 0 in reply to Gokul Koraganji
    TI__Mastermind 19250 points

    Hi Andrew,

    Please let me know if I was able to resolve all your queries. If so, can you please mark the query resolved?

    --
    Regards,
    Gokul.