[Question] SDRAM Power

[ASICList]

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]

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

 

[ASICList]

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

 

[Iouri]

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