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Altera_Forum's avatar
Altera_Forum
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8 years ago

NIOS SDRAM hang up after reset

Dear Forum, as I wish to use SDRAM as the main program memory for testing nios- code I don’t understand why this code works always only on times after download – after reset the nios hangs up. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

What I was thinking about in my last point was that those two lines

--- Quote Start ---

content = 0xABCD;

IOWR_16DIRECT(memory_base, 0, content);

--- Quote End ---

will overwrite the reset vector, causing the system to be unbootable is the CPU has its reset vector set to the SDRAM. Did you try without this operation?

Otherwise the only way I can think about is to use SignalTap on the Avalon masters on the CPU and trigger after a reset to see what the CPU is doing when coming out of reset.