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Altera_Forum's avatar
Altera_Forum
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21 years ago

How to increase DMA fifo depth?

I need to increase the depth of the fifo in an Avalon dma. I thought I remembered reading about it, but I can't seem to find anything that jumps out at me in the .ptf. (dma v3.1, Nios v3.2) ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Hi KenLand,

It's additional info. It seems that fifo_depth numbers will be replaced to power of 2.

We can see following code in em_dma.pm.

if (not is_power_of_two($Options->{fifo_depth}))

{

$Options->{fifo_depth} = next_higher_power_of_two($Options->{fifo_depth});

}