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DP83867CR Fast link drop indication on interrupt pin

Sune Krohn
Prodigy 150 points
Other Parts Discussed in Thread: DP83867CR

We expect to use the DP83867CR in a SyncE setup.

We need to use the "fast link drop" feature, in order in quickly switch clock source in case of link fault.

How can I get fast link drop indication on the interrupt pin (INT/PWDN)?

If I can't get fast link drop indication on the interrupt, which output pins can then?


  • 0
    TI__Mastermind 18425 points

    Hello Sune,

     

    You can use the 0x2D register to configure the FLD and then configure the INT/PWDN pin to act as a interrupt output pin using Register 0x1E bit 7. Then configure the Interrupt pin to trigger on the correct error, Link status change in this case, by using register 0x12. Interrupt status can be read via Register 0x13, the bits will clear on read. Registers 0x1E, 0x13,and 0x12 are described in the datasheet. 0X2D is not mentioned in the DS, please find the information below;

     

    Bit

    Name

    Default

    Description

    15

    Reserved

    0,RW

    Reserved. Ignore on Read, Write 0x0

    14

    FLD_BYPASS_TIMER

    0,RW

    If set Wait Timer for link down is skipped and link is dropped faster.

    13

    Reserved

    0,RW

    Reserved. Ignore on Read, Write 0x0

    12:8

    FLD_STATUS

    0x0,RW

    Fast Link Down Status. Clear on Read

    Bit[12]: Descrambler Link Loss

    Bit[11]: RX Errors

    Bit[10]: MLT3 Errors

    Bit[9]: MSE

    Bit[8]: Energy Lost

    7:5

    Reserved

    0x0,RW

    Reserved. Ignore on Read, Write 0x0

    4:0

    CFG_FLD_MODES

    0x0,RW

    5 options for Fast Link Down. Multiple options can work simultaneously.

    Bit[4]: Descrambler Link Loss

    Bit[3]: RX Errors

    Bit[2]: MLT3 Errors

    Bit[1]: MSE

    Bit[0]: Energy Lost

     

     

    -Regards,

    Aniruddha

  • 0 in reply to Aniruddha Khadye
    Prodigy 150 points

    Hi Aniruddha

    Thanks for the good answer, it seems like exactly the feature I was looking for.
    Register 0x2D is not in the datasheet for DP83867, is this a secret hidden register or is there an extended resister documentation?


    Regards Sune

  • 0 in reply to Sune Krohn
    TI__Mastermind 18425 points

    Hello Sune,

    This information will be added to the datasheet in the next revision.

    -Regards,

    Aniruddha