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DP83869HM: IEEE 1588 hardware time stamp pulse adjust

Steven Hansen
Intellectual 601 points
Part Number: DP83869HM

We are using DP83869HM GPIOs to hardware timestamp RX/TX SFD for IEEE 1588. We are looking to stretch the pulse, but the register to adjust is missing. See below:

What register should be used to control the RX/TX SFD output pulse timing?

  • +1
    TI__Genius 14262 points

    Hi Steven,

    After setting 0x134[7] = 1 to enable SFD output, set 0x1E0[3:0] to 5h (Transmit SFD) or 6h (Receive SFD).

    Once SFD is enabled this way, 0x1E0[7:4] should increment the pulse timing in 8 ns steps.

    Please let me know if you run into any issues with this.

    Thank you,

    Evan