[email protected] wrote:
>
> I'm trying to control a SDR SDRAM (Micron 64Mbit chip) using an
> Altera DE2 board. I've gotten the hardware interface squared away
> (thanks everyone for your help!).
>
> Now it's the tricky stuff. Any one have an idea how I can change
> the refresh rate while the RAM is in operation?
>
> I have the DRAM interface built using the SOPC builder that comes
> with Quartus II using the NIOS II system.
>
> I know you can change the refresh rate during the build but I need
> a way to change the refresh rate during operation. The only thing
> I can think of is maybe change the clock speed? I have it running
> off a 50Mhz clock....

Since the only purpose of the refresh circuitry is to avoid the
memory dropping bits, it should already be running at the slowest
possible rate, and speed reduction will be harmful, while speed
increase will do no good. So this is not a good idea.

What are you trying to do?

--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>



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