5640R FPGA Examples: Samples missing at multiples of DMA-Size

Hi all,
We have started working in NI-5640R IF-RIO with Labview-2011.
In our current setup, a 15 MHz sine wave is generated from a signal generator and it was connected with AI of 5640R.
Then we ran the buit-in examples and recorded the data in Measurement-File (ExpressVI) in TDMD format. The output tdms file was then analyzed using SCOUT software. (see Demo_setup.png).
After running various buit-in example we found that Driver>Stream-to-Disk example was running fine and input 15MHzCW sine wave was acquired perfectely by the 5640R card. (see Driver_Stream_to_Disk.png)
But there seems to be an issue/bug with FPGA>5640R & FPGA>5640R Async examples. THe problem is that when we anlaze the acquired sine-wane in SCOUT software there are jumps in the singal which means that after every DMA some inbetween samples are being skipped by the Device/HOST.
This is shown in the figures FPGA_5640R.png & FPGA_5640R_Async.png that after every DMA(5000) sine wave has jumps.
Afterwards we increased the DMA-size to 10000 and analyzed the captured signal again. It was observed that now the jumps in the sine-wave were visiable at 10000. (see FPGA_5640R_Async_DMA10000.png).
Although Driver-examples are working fine but in our work we want to use 5640R FPGA.
Can anybody explain this behaviour or what should we do to overcome this issue?
Thanks,
-Adeel

Hi Chris,
>>Did you use the Asynch Analog Input Example as it is out of the box or did you make any modifications?
   Yes i used it "as-it-is". Just added a Measurement-FIle at the I/Q output to visualize the results offline.
>>When you are talking about changing the DMA FIFO size, are you referring to the host side or the FPGA?
     I am reffering to "DMA-Read Number-of-Elements" see image below. In examples this parameter is same as "AI-Samples-to-Acquire"
>>From looking at the example, it looks like the host buffer is set to 1M elements, and the FPGA side to 16,383
    Yes this is correct and i didnot changed this settings
>> Is there a chance you are changing the samples to acquire (That starts at a default of 5,000)?
     Yes by default it is 5000 and results were incorrect. Then i changed this to 10000 and 15000 and the results were same i.e. samples were skipped at multiples of this parameter (plz see my first post)
Using hit & trial, this issue was resolved if we disconnecnt "AI-Samples-to-Acquire" control from FPGA-parameter inptu setting, then the error disapered and now every-thing is working fine.
Thanks,
    -Adeel

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