SDRAM in DE1

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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’s DE1_NIOS project.

My program placed in sdram works well. I may successfully access data in sdram using word alignment. However the text from printf() function looks like crap and disordered.

Where is a problem here? I suppose I need the proper sdram timings. Could someone share the proper sdram settings?

Thank you.

Alexander.

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The primary reason for this is the use of printf() itself. printf() sends an interrupt to the processor (because printf works with jtag_uart) and you stand to loose several cycles of data. In fact printf() is not a recommended practice and should be avoided. If you write your data into some file and read it later, that should be still ok.