• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 455 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.

TM4C129DNCPDT: MDC/MDIO accessing of PHY using controller

Abishake Sivasanmugam
Prodigy 40 points

Part Number: TM4C129DNCPDT
Other Parts Discussed in Thread: DP83869HM,

Hi,

We are trying to access DP83869HM PHY using the TM4C129DNCPDT microcontroller. We have manually programmed but the PHY is not responding(0xFFFF) . Is there any MDC/MDIO example program availabe for TM4C129DNCPDT contoller to access PHY in clause 22?

Regards,

Abishake

  • 0
    TI__Guru**** 191886 points

    Hi,

      Sorry, we don't have any example demonstrating MDC/MDIO. I will suggest you check a few things.

      - Do you see any activities on the MDIO/MDC pins?

      - Have you configure MDIO/MDC pins? TheMDC/MDIO pins are by default GPIO pins. You need to configure them for MDC/MDIO functionality. 

      - Make sure you disable the internal PHY. For TM4C1292, internal PHY should not be visible. But still disable it to see if it makes a difference. 

      - PHY addresses 1 to 31 is used to select external PHY. 0 is for the integrated PHY. Make sure you don't set 0 in PLA field in the EMACMIIADDR register.