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Altera_Forum
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14 years ago

NIOS2 to 8 bit MM slave block data transfer -- Help

Hi, I Have a 8bit addressed , 8bit width FIR IP module which i want to interface with NIOS2. My Module is interfaced with 1. MM Slave Interface 2. Interrupt Sender 3. Clk input. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Use signaltap probes on the Avalon signals received on your slave to see how this IOWR translates into signals on the avalon slave interface.

I personally stopped using non 32-bit slaves a long time ago, it gives too many headakes ;). I find it much easier to always use a 32-bit data bus, even if it means ignoring the top 24 bits. I know this is what native addressing is also supposed to do, but I lost a lot of time on this mode. Besides, I think it's deprecated in QSys anyway, so it could be a good idea to stop using it.

Did you try to use a IOWR_32DIRECT macro instead? It shouldn't make any difference in theory, but you never know...