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DP83869HM: Interrupt configuration for Ethernet PHY

Shwetha Nayak
Prodigy 200 points
Part Number: DP83869HM
Other Parts Discussed in Thread: AM6442

Tool/software:

Hi Team,

We are using "DP83869HMRGZR" Ethernet Phy chip which is connected to RGMII interface of the AM6442 processor. So, I would like to know what the exact functionality of the INT/PWDN pin. 

I would like to know your inputs on below

  • If this pin is not configured in software will the ethernet interface will come up and work normally.
  • In our design we have connected this INT pin to one of the pins of the IO expander is this implementation fine.
  • Whether the linux driver for this chip needs configuration of interrupt pin to work

We are using tisdk version 10.00.07.04 

Regards,

Shwetha Nayak

  • 0
    TI__Mastermind 19436 points

    Hi Shwetha, 

    INT/PWDN pin defaults to being a power down. If you have not configured the pin to act as interrupt by accessing the PHY register space. This pin is recommended to connect to VDDIO with 2.2k pull up. The linux driver for this chip will have to configure the interrupt pin to work. 

    Best,
    J

  • 0 in reply to J
    Prodigy 200 points

    Hi J,

    Our design doesn't require the Ethernet PHY to support interrupt mode. In this case, if I don't configure the corresponding pin as an interrupt in the driver, the normal operation of the interface should remain unaffected — is that correct?

    Regards,

    Shwetha Nayak

  • 0 in reply to Shwetha Nayak
    TI__Mastermind 19436 points

    Hi Shwetha,

    If you do not configure the pin as an interrupt pin in the driver, normal operation of the interface should be unaffected. 
    Best,

    J