• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 34 subscribers
  • Views 257 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.

tlk10002's mdio

Yaoting Yang
Intellectual 780 points

Other Parts Discussed in Thread: TLK10002

Hi,

I have two boards with tlk10002 installed on each board. Two boards are identical. But, one tlk10002 works with mdio port properly while the other without any response to the mdio port. I do not know why? I've checked all power supply to the tlk10002 pins. They are all fine. I need some clues to trouble shoot the board. Is there anyone knows what could cause this problem?

Thanks a lot!

Yaoting Yang

  • 0
    TI__Mastermind 20820 points

    Hi Yaoting,

    It sounds like you may have an addressing issue. Have you tried changing the port address on the second device?

    Can you observe the MDIO and MDC waveforms to make sure they are working correctly?

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Intellectual 780 points

    Hi Mike,

    Thanks for your reply!

    The port address is set to "00000" by hardware and i've checked the mdio and mdc lines by a scope. The waveform looks right. 

    I found an issue of reset line. It is supplied by a 3.3V reset signal. Since the spec asks 1.8V+0.3 as a maximum i am afraid it could damage the chip. Do you think it matters?

    Thanks.

    Yaoting

  • 0 in reply to Yaoting Yang
    TI__Mastermind 20820 points

    Hi Yaoting,

    I am glad to heart that you found the source of your problem!

    To answer your question, I do think that the max 1.8V+0.3 does matter. These guidelines are put into the data sheet to ensure proper operation of the IC and also to protect the IC. If they are violated the IC could possibly be damaged.

    Please let me know if you have any more questions.

    Regards,

    Mike