Accuracy of size for the FIFO DMA

I started to develop a code of RT for cRIO with DMA FIFO function application. A few questions have very fundemental

fluctuated around in my mind. The FIFO DMA is supposed to be made up of two components FPGA)

side & on the RT side).

1 the total THAT FIFO composed of FPGA side FIFO + RT side FIFO?

2. the FIFO of DMA size that I put inside the FPGA target in the Project Explorer refers to what just FPGA)

FIFO or Total size)? If it's just FPGA side FIFO, how big is the RT side FIFO together (is

It automatically assigned by RTOS free memory function)?

3. in addition, size defined programmatically by using DMA-configure is the equivalent of setting the size

in the Project Explorer?

4. Finally, how can I estimate the maximum size of the FIFO that I am allowed to use?

Thanks in advance for any response.

Hi Shiva419,

1. Yes, at least a DMA FIFO has these two sides

2. I just read in another reply that the size you set for the FIFO in the Project Explorer is the size of the FIFO on the side FPGA. The size of the FPGA on the side of the RT is much larger (default is 10000 items).

http://forums.NI.com/NI/board/message?board.ID=280&message.ID=5108&query.ID=99697#M5108

Mandar-

Tags: NI Hardware

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