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Altera_Forum's avatar
Altera_Forum
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18 years ago

SDRAM in DE1

Hello All, I have a small problem with sdram on my DE1. I use quartus 7.2sp2, NIOS and SDRAM controller from SOPC builder. I’ve cloned the basic design and SDRAM setting from Terasic&#821...
Altera_Forum's avatar
Altera_Forum
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17 years ago

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It is possible that it is also a printf issue, but in general it is timing issue.

Because when I program DMA to retrieve data from sdram then readed data was crap.

However, DMA write to sdram is ok.

(I used DMA in word transfer mode.)

Alexander.

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In that case, printf() is one of the two contributors to this error. printf() should not be used for printing data from the memories etc. You can use file read/write for this purpose. "Altera Host-Based File System" is a good utility for this purpose.

That said, the cause of your current error appears to stem up from incorrect specification of Read/Write cycles of the memory. I conclude this as you wrote DMA write to SDRAM is fine (though I would like to know how did you ascertain this). Try varying the cycles and reading the memory then.