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DP83630 Energy Detect Power Down with 802.3az EEE

Scott Battocchi
Prodigy 210 points
Other Parts Discussed in Thread: DP83630

Hi,

The datasheet for the DP83630 has this to say about Energy Detect Power Down:

"When Energy Detect is enabled and there is no activity on the cable, the DP83630 will remain in a low power mode while monitoring the transmission line."

How is "activity" defined?  Would an idle but connected remote node count as active?  What about a connection where the other PHY supports 802.3az Energy Efficient Ethernet and is sending the LPI signal?

When activity is detected the datasheet states that a normal power up sequence.  Is there any information on how many packets will typically be missed in a 100M copper implementation before the PHY is able to correctly receive them?

Thanks,
Scott

  • 0
    TI__Intellectual 1720 points

    Hi Scott,

    The PHY will go out of the Energy Detect Power Down mode on any activity on the lines - also Idle (10/100).

    This means once you connect active Link partner the PHY will wake up (Data or Idle).

    This power down mode is not compliance with 802.3az EEE mode, and will wake once LPI are sent.

    The main purpose of this mode is to allow the PHY to be powered down in cases where no link a partner is connected, or the link partner is also powered down.

    Thanks & Regards,

    Oren