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Altera_Forum
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13 years ago

use descriptor chain in SGDMA

Hi all My current goal is to use SGDMA (ST-to-MM) to transfer video data to a memory. Later on, I'll replace the memory by PCIE IP. My problem is how to use descriptor chain in SGDMA. ...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Hi dsl

In order to avoid the problem caused by cache data, I change my used NiosII CPU from NiosII/f to NiosII/e.

I also try to set the 31th bit of the address or use tightly coupled memory in order to bypass the cache when I use NiosII/f.

However, the problem is still the same.

(I'm not sure what I've done with tightly coupled memory is correct. I do exactly the same thing as this document http://www.altera.com/literature/tt/tt_nios2_tightly_coupled_memory_tutorial.pdf)

Anyway, I learn lots of things about how to bypass the cache data. Thank you.