How to use PC RAM in a circuit?

[arash_micro]

Hi all.
Do you know How to use PC RAM in a circuit.For example, i have a 256M ram and i want to use it in my PIC based circuit.
Thanks.

 

[Beowolf]

It is complicated.
1st you need to adress it (32 lines).
2nd you need to receive data (32 or 64 lines)

and, you need to provide logic to keep refreshing it ( becouse it is Dynamic RAM)

You will need a BIG PIC fo it. And I'm not sure how will it behave on slow clock speeds (10MHz for PIC18, or 40MHz for a dsPIC)

You would be better with MMC or SD flash memories. they support SPI communication.

RAM boards for PC just have too many pins to be interfaced to a micro controller. SDRAM (which is obsolete) had around 140 I think, DDR has 180 and DDR2 has 240. If you can find old 72 pin SDRAM's (they were used on Pentium I systems) i would be possible to interface it but these newer chips... no way.