• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 34 subscribers
  • Views 1606 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.

DP83640 rx timestamp is not working

dulciane da silva
Prodigy 20 points
Other Parts Discussed in Thread: DP83640

Hello,

I am using meinberg (M600/GPS PTP(option)) as a PTP master and DP83640 as a PTP client.

I configured DP83640 to receive PTP timestamp as shown below:

PTP_RXCFG0 = 0x0FE5

PTP_RXCFG2 = 0x0000

PTP_RXCFG0 = 0x2FE5

PTP_RXCFG2 = 0x0000

PTP_RXCFG0 = 0x0FE5

PTP_RXCFG1 = 0x00F8

PTP_RXCFG3 = 0x0C00

PTP_RXCFG4 = 0x0000

PTP_RXHASH = 0x0000

 

Inside an endless loop, I am polling the PTP status register (PTP_STS) for some incoming receive timestamp. When some timestamp are received, I read the receive timestamp register (PTP_RXTS) as shown below.

 

PTP_RXTS = 0x4ED8

PTP_RXTS = 0x61AA

PTP_RXTS = 0x01AA

PTP_RXTS = 0x0000

PTP_RXTS = 0x3894

PTP_RXTS = 0x00E8

 

I would like to know why the MSB word of the seconds field is returning zeros? And the last reading is reporting 0x00E8, should I expect 0x0001, see capture. I am missing something in the setup or doing something wrong?

 

Thanks in advance,

Dulciane.

 

I post a wireshark capture from the PTP server.

PTPCapture.zip
  • 0
    TI__Mastermind 31600 points

    Dulciane,

    We will review this and get back to you.

    Patrick

  • 0 in reply to Patrick OFarrell
    Prodigy 20 points

    Hi Patrick,

    let me give more update what i am having experienced.
    1 - Looking into the forum, I also having similar behavior as posted below.
    http://e2e.ti.com/support/interface/ethernet/f/903/t/309102.aspx

    2 - I noticed that the PTP_RXCFG1 was not properly configured. it should be 0xF800 instead of 0x00F8. But when I did that, there is not notification at all about received timestamp. The phy is not receiving the ptp packet correctly? 

    3 - I tried to use insertion and phy status frame to get the timestamp and seems that nothing is being send to the MAC.

    is it possible to setup a conference call to straight this out?
    this is a phone number in NY: (516) 334-0870 ext. 207


    Thanks,
    Dulce.

  • 0 in reply to dulciane da silva
    TI__Mastermind 31600 points

    Dulce,

    Let's try to simplify the debug and focus the effort on a single mechanism for getting the receive timestamp.  Since you had some initial success reading timestamps from the registers, I would suggest we continue with that approach. 

    When you configured PTP_RXCFG1 for 0xF800, you mention there was no notification of received timestamps.  Could you explain that in more detail?  For example, were you still continuously polling the PTP_RXTS register or were you using interrupts? 

    With the device configured as you had it before, including setting PTP_RXCFG1 to 0xF800, and receiving PTP Message, could you dump out the PTP registers on register pages 4, 5, and 6?  I would like to confirm this as well.

    Patrick

  • 0 in reply to Patrick OFarrell
    Prodigy 30 points
    I came across a problem. The ptp status register Receive Timestamp Ready bit is always 0. linux 3 above dp83640.c if (on)
    cfg0 = PSF_EVNT_EN | PSF_RXTS_EN | PSF_TXTS_EN | ENDIAN_FLAG;

    I have make it off. What happens ? And how about changing geting the rx timestamp from phy status frame and how to do? Is there any demos?