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Altera_Forum
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14 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
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi dsl

Thank you for your reply.

I modify my declaration according to your suggestion. 


alt_u32 __attribute__((aligned(32))) ctrl_buf;
alt_u32 __attribute__((aligned(32))) video_buf;

I've also checked my NiosII CPU setting and found that the data cache line size is 32 bytes.

However, in my experiment, the data in video_buf after SGDMA transfer are not completely correct...