Nios DMA problem

Altera_Forum · ‎03-29-2005

Hi, I have a DMA problem.

I use Nios 3.1, QuartusII 4.0, and APEX20K.

When I use DMA to transfer 10 data. I need to know when the DMA start and end its transfer.

I mean the start and the end "clock". Because I need to do some caculation at the "DMA start clock" time.

When I use the nr_dma_copy_range_to_1 function, I can not know the correct starting time(clock) of DMA.

But I really need to know it.

Does anyone can help me?

Thanks a lot. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/ohmy.gif

Altera_Forum · ‎04-05-2005

Hello!

Did you already solve this problem?

I don't think that a extract clock can be found when DMA finished or started once if you use nios'

software to control the DMA because the software running can't be accurate like hardware.

I have an idea that you'll design a hardware port directly handling DMA control slave port. Then you

can attain clock time when DMA start or finish.

regards!