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DP83867E: WoL use case question

Shinya Sawamoto
Expert 5260 points
Part Number: DP83867E
Other Parts Discussed in Thread: DP83869

Hi team,

In case of using WoL for DP83867E and DP83869, the PHY will generate an interrupt signal for waking up the MAC by detecting Magic Packet from Low Power State.
When the PHY is in the Low Power State before detecting Magic Packet, is the MAC expected to be powered off?
As the background for this question is from a concern of voltage routing from the MII signal line in case of powering off the MAC.

From the DP83869 datasheet, it looks any routing issue from the MII signal line can be avoided when MII ISOLATE is asserted.
Is it an acceptable use case to turn off the MAC without any voltage routing when we assert MII ISOLATE?

Thanks in advance.
S.S.

  • +1
    TI__Mastermind 30445 points

    Hi S.S.,

    For WoL applications, the PHY is awake while the system is asleep. Thus, the MAC is powered off and the signaling would hit the asleep MAC. At that point, it is a MAC issue if there is a sensitivity if signals hit it in this state. MII isolate could be a useful setting to help with this application.

    Sincerely,

    Gerome