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DP83640 RX timestamping

Jose Miguel Romero Chica
Prodigy 30 points
Other Parts Discussed in Thread: DP83640

Good day to everybody,

In the PHYTER SW Develpment guide, Section 3.1.3.3 "Receive Timestamp Configuration", it is said that a timestamp can be generated if the destination IP address matches with the user-programmed IP address.

Does it mean that the chip is able to generate a timestamp for any kind of received frame if this condition is full fitted?

Is only possible timstamp any kind of frame, or only PTP frames can be timepstamped?

Thanks for your help.

Regards,

José Miguel.

  • 0
    TI__Mastermind 31600 points

    The DP83640 was designed to support various configuration options for timestamping, but it was not intended to timestamp all packets.  What are the considerations for your application?  What types of packets would be timestamped and what other packets would be in the network, but would not be timestamped?

    Patrick

  • 0 in reply to Patrick OFarrell
    Prodigy 30 points

    Hi Patrick,

    Thanks for the fast answer. My approach was using the capabilities of the chip for monitoring an Ethernet network, and timestamping the frames with the lowest latency possible by doing it at the physical layer.

    If the DP83640 were not able to do this, is there any device able to do this job?

    José Miguel.

  • 0 in reply to Patrick OFarrell
    Prodigy 30 points

    Hello again.

    In the network it will be sent monitoring traffic by using best effort, and shall be ignored, and rate constrained traffic that must be timestamped with the highest precision possible.

    Both of them will be encapsulated in UDP frames and with a destination address different to the PHY's address, so the DP83640 must be configured for the promiscuous mode.

    Thanks in advance.

    José Miguel.