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bachelor
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Registered: ‎03-21-2016

Can reference clock of SRIO be generated from MMCM?

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Hello,

 

       We are going to use SRIO in Kintex UltraScale. In the system, there is a 30.72MHz external reference clock, and we use MMCM to generate the required clocks for other logic designs. Is it possible to generate the required 125MHz reference clock for SRIO in the same way? (We did the same design in Virtex-7, and it works well.)

 

       We have tried to replace IBUFDS_GTE3 with BUFG_GT or BUFG, and connect to MMCM's output. But, there are still errors or critical warnings in VIvado 2015.4. If we use BUFG_GT, it shows the MMCM output clock is not completely routed. However, it shows an error that GTGREFCLK is reserved for test purposes only and it may be caused by driving a REFCLK with a BUFG when we use BUFG. Instead of using dedicated reference clock input pins, how to generate proper reference clock internally in our case?

 

Thank you very much.

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pratham
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17,938 Views
Registered: ‎06-05-2013

@bachelor Check this

http://www.xilinx.com/support/answers/61656.html

http://www.xilinx.com/support/answers/53500.html

-Pratham

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vsrunga
Xilinx Employee
Xilinx Employee
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Registered: ‎07-11-2011

@bachelor

 

Reference clock for SRIO IP goes with GT requirements, please refer "GTH Transceiver Reference Clock Checklis" section from UG576 for details. We recommend to go with dedicated MGTREFCLK pins only.

 

 

Hope this helps

 

-Vanitha

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Mark the post - "Accept as solution" and give kudos if information provided is helpful and reply oriented
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pratham
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17,939 Views
Registered: ‎06-05-2013

@bachelor Check this

http://www.xilinx.com/support/answers/61656.html

http://www.xilinx.com/support/answers/53500.html

-Pratham

----------------------------------------------------------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.

Give Kudos to a post which you think is helpful and reply oriented.
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View solution in original post

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bachelor
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Registered: ‎03-21-2016

Hi, @vsrunga @pratham

 

      Thanks for your reply and recommendations. This helps us to make the decisions.

 

bachelor

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