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Visitor emakinbo
Visitor
515 Views
Registered: ‎08-09-2018

Ultrascale+ GTH RX Phase Interpolator

Hello,

I found this answer record for how to manually adjust the RX phase interpolator for the 7 Series GTX: https://www.xilinx.com/support/answers/46024.html

Is the same thing possible in the Ultrascale+ GTH, and if so which ports would I use to access the configuration of the RX PI?

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4 Replies
Moderator
Moderator
438 Views
Registered: ‎07-30-2007

Re: Ultrascale+ GTH RX Phase Interpolator

We don't support those kind of changes oridinarily.    What are you trying to accomplish by doing this?

Roy


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Visitor beatsgr
Visitor
303 Views
Registered: ‎01-22-2019

Re: Ultrascale+ GTH RX Phase Interpolator

I also wondering how to change the phase of RX sampling clock,I tried the way for GTX, changing th e RXCDR_CFG of address 0xa8. I sent the 0xaaaaaaaa, but I can only receive the same thing even I have went throuth all 128 phases.

Is the GTX and GTH different? And is that pissible to shift the phase of RX of GTH transeceivers?

 Thanks!

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Visitor mecwee
Visitor
291 Views
Registered: ‎09-28-2017

Re: Ultrascale+ GTH RX Phase Interpolator

I have the same question. I was able to bypass CDR, and use the RX clock that I provided from external. However, I cannot find any information to use the RX PI to shift the phase. Would you advise? 

Since the TX PI works well, I would assume that the RX PI should be able to do the same thing for us to fine tune the phase for our specific high-speed SERDES application.

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Xilinx Employee
Xilinx Employee
240 Views
Registered: ‎08-07-2007

回复: Ultrascale+ GTH RX Phase Interpolator

hi @emakinbo 

 

we don't support manually tune the RX PI in US/US+.

you can have a look at this example design which implements the quick lock for PON like designs.

 

https://www.xilinx.com/support/documentation/application_notes/xapp1252-burst-clk-data-recovery.pdf

 

Thanks,

Boris

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