used logic elements increase rapidly!

Thanks for your attention and forgive for my late reply.

There are files like "burst_0.v" in my folder as I enable the burst option for my nios II, but it's not the main factor because they had been there before I added the DMA.

I had found out the cause while I compare the "Resource Utilization by Entity" reports. I had used a dc-fifo in my sopc system, which changed to use register resources after the dma component had been added. However, it is supposed to use memory resources.

I still don't konw how to make the fifo use memory resources forever.