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DP83640 Clock Step Timestamp Invalid

Bradley Higgin
Intellectual 535 points

Whenever I step the PHY clock, the very next RX timestamp will always have the highest nanosecond bit set (0x80000000).

Please confirm this behavior.

Tx,

Brad

  • 0
    TI__Mastermind 31600 points

    Brad,

    Please refer the customer to section 3.1.3.4 of the Software Development Guide (SDG) titled "Receive Timestamp Insertion". For your convenience, I have quoted the relevant text below:

    Bit 31 of the nanoseconds field is used to indicate that a time correction has been completed prior to the capture of this timestamp. This flag will be asserted when either a clock step adjustment or a temporary rate correction has been completed. Software can use this to determine if the timestamp includes the latest time correction.

    Patrick