Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Avalon MM/ST/SGDMA Byte ordering

Hi, I'm using the SGDMA IP core to transfer some data from Avalon MM interface to Avalon ST interface and back to Avalon MM. Everything 32 bit width. NIOS->Memory-> Avalon MM -> SGDMA...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Yes I have faced this problem before. The Avalon MM specification is little endian and the Avalon Stream specification is big endian.

How did you configure the SGDMA? IIRC if you configure its data size as 4 symbols per tick and 8 bits per symbol, instead of 1 symbol per tick and 32 bits per symbol, it will convert the endianes for you. I'm not 100% sure though, it was a while ago I had to solve this problem.