How to use SDRAM on de2-70 board?

Honored Contributor

15 years ago

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hi, there.

I wrote a document which describes how to access Avalon-Bus in HDL.

here you can see the document.

next step, I will tell you how to read/write memories with using burst transfer.

next step is final step of your question.

have a nice day.

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Hi.

I followed your first instruction, and I have the result as you said.

I am trying to do your second instruction, and I have some questions again..

1. Why do I have to use cpuclock, sdramclock?

Why are they separated from mainclock(50Mhz)?

(I don't know the reason about 3 clocks)

And I can't setup Timer, DLL, so I tried to study about that.

2. What's the difference with Avalon-Master and Avalon-Slave?

(I don't know what's the Avalon)..

and Why do I use Custom-IP Ram?

Can I just use SDRAM or On-chip Memory for data in/out from ram address?

For example, can I use only SDRAM address(0x00800000 in your second instruction) instead of Custom-IP & On-chip Memory address(0x00002000

& 0x00002010) in 11 page of second instruction?

Thanks for your very kind help.

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