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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
Icon for Honored Contributor rankHonored Contributor
17 years ago

I forgot to say that I was trying to get it working at slow clock frequency 30 MHz. Well, at now I have it working.

This is my recipe how to do this:

In the SOPC Builder set clock settings to 100MHz. It is very important to set this value despite the actual clock frequency.

It is possible to leave all timing setting by wizard default. Actually we have to decrease the value "Issue one refresh command every", but default value works fine for me.

Set sdram rise clock prior system clock on 3 ns.

That's all.

Alexander.