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Problem with datalogging using FPGA and DMA

Hi all I am using the 7831R FPGA device on a PXI-1042 platform for data logging.

 

Currently i am acquiring one digital input and four analog inputs for my application.

 

I am writing the four analog inputs, along with the time stamp, to a memory location (FIFO) in the FPGA vi and then accessing back them using DMA on the host.

 

Then, i am de-interlacing the array and writing it to a spreadsheet.

 

Now, the problem i am facing is, "there is a suden data loss at regular instants in the acquired excel file". My sampling time is 30 micro seconds.

 

I am attatching the FPGA and Host VI's.

 

I would be glad is someone could help me out of this. I have been trying for a long time now, by changing the sample time, depth of the data etc., but could not eliminate the data loss.

 

Thank You

Vijay Chand Ganti

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