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Ethernet PHY - IEEE 1588 master clock device

Daisuke Maeda
Guru 19895 points
Other Parts Discussed in Thread: DP83630, TLK111, DP83640, DP83640SW-LIB

Can DP83630 be an IEEE 1588 master clock device? If not, are there other devices supporting it?

DP83630 supports the Precision Time Protocol (PTP). TLK111 also supports it. Can TLK111 be an IEEE 1588 master clock device?

Best regards,

Daisuke

 

  • 0
    TI__Mastermind 23675 points

    Hi Daisuke,

    IEEE 1588 master clocks are normally GPS or calibrated atomic clocks. The IEEE 1588 standard uses a BMC (Best Master Clock) algorithm to determine which clock in your system will be used to have all other clocks synchronize to. 

    I will check with my colleagues about a PHY clock acting as a grandmaster clock and get back to you.

    Regards,

    Ross

  • 0 in reply to Ross Pimentel
    Guru 19895 points

    Hi Ross,

    Thank you for your reply.

    I'm sorry. I may ask the irrelevant question because I am not familiar with IEEE 1588.

    Can DP83630 be used for an IEEE 1588 master clock device? If not, is there an ethernet PHY which can be used for it?
     
    DP83630 supports the Precision Time Protocol (PTP). TLK111 also supports it. Can TLK111 be used for an IEEE 1588 master clock device?

    If there is a PHY clock acting as a grandmaster clock, please let me know.

    Best regards,

    Daisuke

     

  • 0 in reply to Daisuke Maeda
    TI__Mastermind 23675 points

    Hi Daisuke,

    What is the application that you are trying to have this implemented in?

    For a point-to-point type system that does not require global sync, the DP83640 is a great choice for implementing IEEE 1588 Master mode. The DP83640 can act as a Master and have all other clocks in the system sync to it. The device can also act as a bridge clock and sync to a master clock and then pass along sync to lower clocks in its local system. 

    Regards,

    Ross

  • 0 in reply to Ross Pimentel
    Guru 19895 points

    Hi Ross,
     
    Thank you for your reply.

    I will check the application of our customer.
     
    Do you explain the features of the One-Step Operation and the Receive Timestamp Insertion, which are supported by DP83630 or DP83640?
     
    In addition, I have other question.

    "2.3 Key IEEE 1588 Features" in the DP83630 datasheet describes as follows:

    "The DP83630 provides features for controlling the clock operation in Slave mode. The clock value can be updated to match the Master clock in several ways."

    Does this mean that the clock value cannot be updated to match the grandmaster clock in RGMII master mode? Is the clock value not adjusted automatically?

    Best regards,
     
    Daisuke

     

  • 0 in reply to Daisuke Maeda
    TI__Mastermind 23675 points

    Hi Daisuke,

    Apologies for the delay. There is a Software Development Guide (SDG) for DP83640.

    http://www.ti.com/tool/dp83640sw-lib

    In the SDG you will find information about 1-step operation and receive timestamp insertion.

    Regards,

    Ross

  • 0 in reply to Ross Pimentel
    Guru 19895 points

    Hi Ross,
     
    Thank you for your reply.
     
    Best regards,
     
    Daisuke