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Cyclone V and data conversion board - arbitrary frequency

Honored Contributor II

Hello Altera Forums, 


I'm using a Cyclone V GX Starter Kit with a data conversion board plugged into the HSMC slot. 


I am using a 50MHz clock generated by a PLL. This clock is sent to pins 95 and 155 of the HSMC (for ADC channels A and B ). On the DCB card, I have pins 1 and 3 connected on J3 and J7, as per the manual. 


I am able to record data with this with no issues (Signaltap_50MHz.png): 




When I change to PLL clock to some other frequency however, the data I get is nonsense (example is at 40MHz, but the same issue occurs at other frequencies. I've tried 60, 100, and 150MHz) (Signaltap_40MHz.png): 




Is there anything I should be checking to make this work properly? I have read the manual for the DCB, and found no indication that it can't run at an arbitrary frequency. 


If there's any more info I can send to help solve this, please let me know. 


Thank you for your assistance, 

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Honored Contributor II

I was able to solve this problem. There's an example of how to use the data conversion card on the terasic website: http://www.terasic.com.tw/cgi-bin/page/archive.pl?language=english&categoryno=165&no=830&partno=4

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