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Visitor dawang
Visitor
480 Views
Registered: ‎12-19-2018

Serial I/O Scan status reports incomplete, where the link is lock with BER below 10E-14

Hi, there 

 

I am using the ibert for gty trancesiver. The version of Vivado is 2018.3. 

I can see in the hardware manger that the link is up with 0 bit errors. But when I run the scan on the link of the transceivers, I always get the status: incomplete, no matter 1D/2D scan. I have a look at ug908, chapter 14 and 15, did not find any solution there. 

 

Any further suggetions?

 

Thanks

David

ibert_status.png
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5 Replies
Xilinx Employee
Xilinx Employee
467 Views
Registered: ‎11-29-2007

Re: Serial I/O Scan status reports incomplete, where the link is lock with BER below 10E-14

hello

in order to acquire a statistically valid set of measurements, IBERT needs to wait for a number of samples that is big if your target BER is small. It is possible that you set a target BER so small that this require days for the eyescan to be completed?

i.e. BER = 10^-2 means that you need at least 100 samples to capture one error. But if you are interested to BER = 10^-3 you need to wait at least 1000 samples to capture the first error.

In reality this is more complicated. Please check AR66799

Visitor dawang
Visitor
456 Views
Registered: ‎12-19-2018

Re: Serial I/O Scan status reports incomplete, where the link is lock with BER below 10E-14

Here I am using 10^-5, so should not be too slow. 

Also if the progress is slow, should the progress bar with some number increasing to show the progress? In my case, the progress is always 0%.

 

 

scan_ibert.png
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Xilinx Employee
Xilinx Employee
444 Views
Registered: ‎11-29-2007

Re: Serial I/O Scan status reports incomplete, where the link is lock with BER below 10E-14

hello

if you inject an error at transmitter side, is this error captured from the receiver?

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Visitor dawang
Visitor
430 Views
Registered: ‎12-19-2018

Re: Serial I/O Scan status reports incomplete, where the link is lock with BER below 10E-14

The injecting error works as expected. Also I can get the eye diagram now. 

The changes I made was to change the region and language of my computer, and rebooting my FPGA platform.  

But one issue, I set the Serdes to work as 10.3125Gbps, but somehow only get 6.6Gbps from Status column in serial IO. How could this happen?

 

Thanks

 

eye_diagram.png
ibert_setting.png
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Xilinx Employee
Xilinx Employee
413 Views
Registered: ‎08-07-2007

Re: Serial I/O Scan status reports incomplete, where the link is lock with BER below 10E-14

hi @dawang 

 

you can check if the system clock frequency in IBERT setting can match hardware.

 

Thanks,

Boris

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