SDRAM and SPI bus

Thread Starter

Jane1

Joined Sep 28, 2011
13
As far as I know flash integrated citcuits are used as SPI devices. So if
I want to program it( flash it) I must write only a block by block and I
must know the SPI address. No possibility to write to a particular flash
address.

But how are SDRAM used? Also like SPI device?
In my device( there is also CPU) e.g. there are 2 and 2 SDRAM integrated
circuits(modues).Together 4 modules. .( Let's call them M1,M2,M3,M4.)
M1&M3 are connected in a parallel way and having its OWN clock and M2&M4
are
connected in a parallel way too and having its OWN clock but different
from M1&M3. How I can say that some data should be written to a module M1
and not M2? Is there any tutorial how SDRAM can be used in embeded
systems? Thanks
 
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