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DP83822I: Wake up from active sleep

Takeshi Sasaki
Expert 4480 points
Part Number: DP83822I

Hi team,

Could you give me comments on following customer question?

<Customer question>

For active sleep, dp83822 sends out NLPs every 1.4 seconds to wake up the link partner, and automatic power-up  occurs when the link partner is detected, as described following app note.

http://www.ti.com/lit/an/snla260/snla260.pdf

Could you give me more detail description of how to wake up from the active sleep mode? For example, when the dp83822 can't detect any link pulses from the link partner, even though dp83822 sends out the NLPs, but dp83822 can't wake up from the active sleep mode. Is it correct understanding?

Best regards,

Takeshi Sasaki

  • 0
    TI__Mastermind 18425 points

    Hello Sasaki-san,

    That is correct, when DP83822 does not detect link partner it will remain in Active Sleep mode and continue to send NLP every 1.4 seconds. When it detects energy from link partner it will automatically exit sleep mode and enter normal mode.

    -Regards

    Aniruddha

  • 0 in reply to Aniruddha Khadye
    TI__Expert 4480 points

    Hi Aniruddha,

    Could you give me comments on following additional question related to this topic?

    <Additional question>

    Q. When DP83822 will enter the active sleep mode followed by the register setting after link down and during retry link-up, what will the auto-negotiation happen between DP83822 and the link partner? When the link partner will receive NLP from active sleep mode DP83822, the link partner will recognize 10M half, but, if the link partner will receive FLP from DP83822 during retry link-up, the link partner will recognize DP83822 based on the advertisement. Attached is the image that I want to talk about the situation.