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Altera_Forum's avatar
Altera_Forum
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16 years ago

Nios crashes when reading from the DDR2

Hi, I'm trying to setup the DDR2 as a frame buffer for streaming to a display. Currently, I am able to write and read pixels to and from the off-chip DDR2 and communicate with custom ha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Yes, the NIOS "hangs", meaning, if in debug mode and pressing the run button, I would see nothing triggering in SignalTap, and when pressing the pause button, it exits saying "processor failed to go into debug mode when requested." To be more precise, in SignalTap I see correct reads for a few pixels being written and then read, and then it hangs at some point.

When stepping through the code it always hangs when attempting a read from the DDR2, but not always on the first read.