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Observer
Observer
659 Views
Registered: ‎07-02-2018

Channel up is never asserted in Aurora 64b66b

Hello,

I have two boards connected through a backplane. The fisrt one has two xcku115 and the second one has two xcvu190.

I would like to connect both of them with an aurora 64b66b, but the problem is channel up signal is never asserted, although lane up is ok.

I tried to connect two kintex which are in the same board, and it is works perfectly (channel up and lane up are asserted). I have been checking the backplane and it seems it is well routed.

 

Do I miss something in the configuration wizard?

 

Kind regards.

Sergio

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Teacher
Teacher
642 Views
Registered: ‎07-09-2009

iBERT .

 

You are into the world of serial IO,

   pre and post equalisation, gains, eye diagrams et all.

 

Whats your BERT and eye look like ?

 

It might not be these, but you have to get these right before you move on,

 

https://www.xilinx.com/video/hardware/in-system-ibert.html

 

https://www.xilinx.com/support/documentation/application_notes/xapp743-eye-scan-mb-mcs.pdf

 

at these sort of frequencies, 

    things like vias and routing have a significant affect.

 

 

 

 

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Moderator
Moderator
633 Views
Registered: ‎05-02-2017

hi @sasn1,

 

The criteria for channel_up signal assertion are the verification sequence (defined in the Aurora 64B/66B protocol) being transferred between channel partners, and the successful reception of four verification sequences. Enable loopback mode and check for lane_up assertions. Bring the CHANNEL_INIT_SM module FSM state signals to debug if channel_up is not asserted. For a simplex link, the simplex TX partner might have already achieved channel_up status.

 

Chandra 

 

Regards
Chandra sekhar
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