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acgropp1
Adventurer
Adventurer
5,369 Views
Registered: ‎06-25-2015

What does the RXCDR_CFG do exactly?

Hello, I am trying to thoroughly understand how the CDR unit works in the GTX.  I have not be successful in finding much information in it. I did notice that there is a RXCDR_CFG parameter that is generated by the GT wizard. The GTX user guide specifies to use the generated value. What exactly does this configure in the CDR? Thanks in advance.

 

Adam Gropp

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acgropp1
Adventurer
Adventurer
5,364 Views
Registered: ‎06-25-2015

By the way I am using the KC705 eval board

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balkris
Xilinx Employee
Xilinx Employee
5,363 Views
Registered: ‎08-01-2008

check this AR
http://www.xilinx.com/support/answers/57742.html
Thanks and Regards
Balkrishan
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acgropp1
Adventurer
Adventurer
5,349 Views
Registered: ‎06-25-2015

Thank you for this. So is it a parameter for the edge sampler (ppm) and data sampler (protocol)? I am just wanting to understand it at a lower level. 

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venkata
Moderator
Moderator
4,979 Views
Registered: ‎02-16-2010

The details of the parameter is not shared in any external documentation. The recommendation is to use the value generated from GT wizard.
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venkata
Moderator
Moderator
4,974 Views
Registered: ‎02-16-2010

RXCDR_CFG sets the CDR parameters like loop bandwidth, enabling first order/second order loop, allowed ppm level etc.
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