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[Question] SDRAM Power

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ASICList

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HI~~

I have one question for the SDRAM Power.
I use the Samsung SDRAM, and there is one chip for communicating with SDRAM.

I serve the 2 isolated 3.3V power to each chip.

But when I did power-off on SDRAM, SDRAM still have 3.3V power.

Is it possible upper situation?

Only connection with ADDR, DATA, how to serve the power on SDRAM?

Please advice to me!
 

Iouri

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why do you need two power supplies to power SDRAM?? Are you sure it is not DDRAM or DDRAM2??
 

ASICList

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It's for the noise issue. And it's exactly SDRAM.
 

Iouri

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What is the source for the noise, you are concerning?
What is enviroment spec for your design??
 

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