• State
  • Locked Locked
  • Replies 6 replies
  • Subscribers 34 subscribers
  • Views 1715 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Whats is the Maximum Link-Up time using Fast ANEG/Fast Force AMDIX after Power-up [TLK1xx]

Kummi
Mastermind 6220 points
Other Parts Discussed in Thread: TLK105

Hi,

One of our customer is considering TLK105 for their Ethernet/EhterCAT application.

The TLK1xx has Fast ANEG/Fast Force AMDIX features and can we believe it is faster
when compared to other maker PHYs?

We would like to know what could be the maximum time required to Establish Link through
Fast ANEG/Fast Force AMDIX after a Power-Up.

I can understand that the Link-Up time may depend on some system criteria, 
but if possible could you please let us know what could be a Minimum and Maximum
time required for Link-Up between two TLK105 PHYs with the same configuration..

In an another application using a different PHY,
sometimes(10times out of 10000times) the Link-up time takes upto 20 to 30 seconds
and we are finding out if this could be overcome by replacing the PHY by TLK1xx.

Best Regards.
Kummi.

  • 0
    TI__Mastermind 31600 points

    Kummi,

    Thank you for your inputs.  Could you provide some information on the improvement in link up time that you saw when you replaced the other PHY with TLK1xx?  

    You are correct that the link up time will depend on system criteria.  However, we will see what general guidance we can provide on link up times and response in a follow up post.

    Patrick

  • 0 in reply to Patrick OFarrell
    Mastermind 6220 points
    Hi Patrick,

    Thank you for the quick response.

    The customer has not yet used TLK1xx, but we are promoting them to replace
    their current PHY with TLK1xx..

    As mentioned above we need data about TLK1xx's Link-up time in order to
    convince the customer that TLK1xx has better feature that the current solution.

    If possible could you please let us know if there is any reference data
    on TLK1xx's quick link-up time?

    Below old document from Broadcom(dated 2002) mentions that Link-up time may be
    around 2 to 4 seconds, we would like to know in if this is time is small in TLK1xx with
    Fast ANEG/Fast Force AMDIX features?
    www.ieee802.org/.../brown_1_0102.pdf

    Best Regards
    Kummi.
  • 0 in reply to Kummi
    Mastermind 6220 points
    Hi Patrick,

    Please let me know if there is any comment on the above.
  • 0 in reply to Kummi
    Mastermind 6220 points
    Hi Patrick,

    Please let me know if there is any suggestions...
    We are going to meet the customer tomorrow and it would be helpful
    if there is any details on this topic.....
  • 0 in reply to Kummi
    TI__Mastermind 31600 points

    Kummi,

    It is difficult to establish a maximum link time when auto-negotiation is enabled, especially when Auto-MDIX is enabled.  When Auto-MDIX is enabled, the two PHYs trying to establish link will swap their transmit and receive pairs at random intervals to determine the best configuration for communication.  Since the process is random, it can take several iterations and can vary from one link to the next.  

    For auto-negotiation in general, 2-4 seconds is a reasonable estimate for a basic link based on the standard timers.  Many, if not most, links will be established in this amount of time.  However, depending on Auto-MDIX and other factors, the time can be longer.

    The Fast ANEG and Fast Auto MDI-X features reduce the duration of the timers involved.  Based on the values of the timers, the reduction could be 2x or greater, but again, the randomness of the timers makes it impossible to establish firm boundaries on the times.

    Patrick

  • 0 in reply to Patrick OFarrell
    Mastermind 6220 points

    Hi Patrick,

    Thank you so much for the details.
    This information is very helpful...

    One additional question is, will the above link-up time(2-4 seconds in general)
    would be same in case of multiple PHYs(same network)?
    If possible could you please let us know will there be any additional delay if there are 
    multiple PHYs running(after cold reset) simultaneously.

    Best Regards,
    Kummi