UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

cancel
Showing results for 
Search instead for 
Did you mean: 
Highlighted
Observer prakashdrj
Observer
5,466 Views
Registered: ‎07-12-2016

Characterizion of 7 Series GTX

Jump to solution

Hello All,

 

I am working on custom protocol, which has 5 GT/s. I feel that whatever parameter generated by Wizard not fulfil the requirement so want to change it.

 

Is there any method or algo to do so? I have already used the parameters as per UG746.

 

How can I use eye scan/sweep to determine the parameterization of GTX?

 

Regards,

Prakash

0 Kudos
1 Solution

Accepted Solutions
Moderator
Moderator
5,928 Views
Registered: ‎02-16-2010

Re: Characterizion of 7 Series GTX

Jump to solution
Use IBERT and run eye scan with your application data. This helps to know the eye opening after the equalizer inside the GT receiver.
------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------
0 Kudos
6 Replies
Xilinx Employee
Xilinx Employee
5,447 Views
Registered: ‎08-01-2008

Re: Characterizion of 7 Series GTX

Jump to solution
check this ARs
http://www.xilinx.com/support/answers/60024.html

check this document as well
http://www.xilinx.com/support/documentation/sw_manuals/xilinx2015_4/ug908-vivado-programming-debugging.pdf
Thanks and Regards
Balkrishan
--------------------------------------------------------------------------------------------
Please mark the post as an answer "Accept as solution" in case it helped resolve your query.
Give kudos in case a post in case it guided to the solution.
Moderator
Moderator
5,370 Views
Registered: ‎02-16-2010

Re: Characterizion of 7 Series GTX

Jump to solution
What is your requirement? How do you confirm if the requirement is fulfilled?
------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------
0 Kudos
Observer prakashdrj
Observer
5,297 Views
Registered: ‎07-12-2016

Re: Characterizion of 7 Series GTX

Jump to solution

@venkata @balkris

I have used parameters as generated by wizard it self.

 

I am observing bit loss after some interval, then switched to IBERT and concluded that BER with that generated parameters are not giving required BER, required one 10^-12.

 

How can I obtain those valid parameter valuation?

 

Regards,

Prakash

0 Kudos
Moderator
Moderator
5,278 Views
Registered: ‎02-16-2010

Re: Characterizion of 7 Series GTX

Jump to solution
Check if the refclk you use meets the required phase noise mask as mentioned in AR#44549
http://www.xilinx.com/support/answers/44549.html

Please try to use different values for TXDIFFCTRL, TXPRECURSOR, TXPOSTCURSOR. Check the ug476 for mapping of different values set to these inputs and with the Tx driver voltage and pre/post emphasis levels.
------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------
Observer prakashdrj
Observer
5,254 Views
Registered: ‎07-12-2016

Re: Characterizion of 7 Series GTX

Jump to solution

@venkata,

 

REF clock has same profile as your pointed AR.

 

In our case TX side is behaving properly. But RX side we observe the bit loss. Other than ref clock what are the cause of bit loss?

 

Your help is appreciated a lot.

 

Best Regards,

Prakash

0 Kudos
Moderator
Moderator
5,929 Views
Registered: ‎02-16-2010

Re: Characterizion of 7 Series GTX

Jump to solution
Use IBERT and run eye scan with your application data. This helps to know the eye opening after the equalizer inside the GT receiver.
------------------------------------------------------------------------------
Don't forget to reply, give kudo and accept as solution
------------------------------------------------------------------------------
0 Kudos