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Debug data on DAC is not same as debug data on ADC?

Question asked by mr_nazrin on Jul 15, 2014
Latest reply on Feb 24, 2015 by AZubair

Hi FPGA Reference Designs Support Community,

 

I just did some experiment so that I can verify data receive from ADC should same data sending from DAC. I run No-OS platform AD-FMCOMMS1 and perform debug thru Chipscope tool on AD9643(adc_mon_data) and AD9122 (dac_dbg_data) from the same signal test (dac_dma_setup(fmcSel);) concurrently  .

 

My initial expectation is the data I receive from ADC (receive) must be same data from DAC (transmit). But from data debug by Chipscope on ADC shows different content. I also use signal from dds_setup(fmcSel, 1000000, 1000000); and its behave similar result.

Do you have any idea or theory explanation? Then how can I get 100% data integrity on this system?

 

DAC 9122 debug.jpgADC 9643 debug.jpg

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