Support in Openmoko for Partial Array Self Refresh

Andy Green andy at openmoko.com
Mon Sep 29 16:07:47 CEST 2008


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Somebody in the thread at some point said:
| Hello,
|       I am newly introduced to openmoko. I am working on a power
| management project on mobile devices.
|       I searched on whether the  memory management unit of openmoko
| supports the PASR (partial array self refresh) feature that is available
| in hardware in DRam used by Openmoko, but i could not find it.
|       Can anyone please tell me if this feature is supported by Openmoko?

Half the memory (the half in the CPU module) has PASR, the other half
(externally connected by memory bus) doesn't seem to.

Here's the half that has it:

http://www.samsung.com/global/system/business/semiconductor/product/2007/6/11/MobileSDRAM/MobileSDRSDRAM/512Mbit/K4M51323PC/ds_k4m51323pc.pdf

Unfortunately both halves share the same power supply, so it won't
really save you any power.

- -Andy
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