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Original question:

DP83867E: link-up time higher than specified

DP83867E: Improve link up timing

Stephanie Hibler
Prodigy 725 points
Part Number: DP83867E

With DP83867E configured as 1000 Mbps, Full Duplex, Auto-Negotiation Enabled on Copper Media side and Disabled on MAC side, the DP83867E link up established time is measured at about 3.7s. 

My customer would like to know if there a way to configure the PHY to improve the link up timing?

  • 0
    TI__Guru**** 189879 points

    Hello 

    Please check if the below section helps

    8.4.6.4 Fast Link Detect Several advanced modes are available for fast link establishment. Unlike the Auto-Negotiation and Auto-MDIX mechanisms defined by the IEEE 802.3 specification, these modes are specific to the DP83867. Take care when implementing these modes. For best operation, TI recommends implementing these modes with a DP83867 on both ends of the link. These advanced link and crossover modes depend on the speed selected for the link. Some modes are intended for use in 1000Base-T operation. Others are intended for use in 100Base-TX operation. Fast Link Detect functionality can be configured using the Configuration Register 3 (CFG3), address 0x001E.

    Regards,

    Sreenivasa