DP83822H: Link Lost A/B counter increments when reconnecting the slave device

Marc W.

Part Number: DP83822H
Other Parts Discussed in Thread: AMIC110

Hi,

some time ago there was a discussion because of the link lost counters.
The counters of port 0 and port 1 were incrementing by one after restarting (power reset) the device.

e2e.ti.com/.../dp83822h-ethercat-conformance-test---link-lost-a-b-counter-reset-behavior

Another scenario came up doing a reconnection after a EtherCAT communication has been established (unplug and plug network cable of the slave device). In this case the counter of the used port is incremented by two, The increment of both link lost counters after a power reset was justified because of the PHY reset that is initiated as start of application.

Do you have any idea why the counter of the connected port increments in case of a reconnection? There should be any other reason.

I am using the "EtherCAT Full Feature Demo Application" from the "PRU-ICSS EtherCAT Industrial Package" on the AMIC110 ICE EVM.

Sincerely,

Marc

over 4 years ago

0 Joe Vanacore over 4 years ago

TI__Genius 17140 points

Hi Marc,

I will look through that other thread and your current question and I will get back to you by the end of business Wednesday 9/1.

Kind Regards,

Joe

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

0 Joe Vanacore over 4 years ago in reply to Joe Vanacore

TI__Genius 17140 points

Hi Marc,

I am still looking into your issue and I will provide an answer by the end of business tomorrow.

I appreciate your patience.

Kind Regards,

Joe

0 Joe Vanacore over 4 years ago in reply to Joe Vanacore

TI__Genius 17140 points

Hi Marc,

I suspect this is because of the manual disconnection and reconnection. By doing this, there may be a link up and link down before a solid link is established.

Can you emulate the situation by resetting the link partner or powering down the link partner?

Kind Regards,

Joe

0 Joe Vanacore over 4 years ago in reply to Joe Vanacore

TI__Genius 17140 points

Hi Marc,

There have not been any posts to this thread for quite some time. I will now close it. If you have more questions please open a new thread or respond to this post to reopen this thread.

Kind Regards,

Joe

0 Marc W. over 3 years ago in reply to Joe Vanacore

Intellectual 440 points

Hi Joe,

sorry, that I did not answer before. I was on holiday.

Well. when resetting the link partner before the AMIC110 ICE EVM the counter also increments by two as you can see in my first attached screenshot.

Otherwise, when resetting the link partner behind AMIC110 ICE EVM the other counter increments by two as you can see in the following screenshot.

The counters of the link partners always keep the value zero independently of a reset or disconnection of the EtherCAT connection.

During the official conformance tests a change of the counters was noted as an undesirable behaviour, but it does not cause the tests to fail

Kind Regards,

Marc

0 Kallikuppa Sreenivasa over 3 years ago in reply to Marc W.

TI__Guru**** 190009 points

Hello Marc,

Thank you for updating.

Regards,

Sreenivasa

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DP83822H: Link Lost A/B counter increments when reconnecting the slave device