Electronic – Why can’t I find SOCs with integrated memory


I am looking for SOCs with integrated memory to avoid having to worry about design of a memory bus for, what is supposed to be, a pretty low power application. I'm looking for something like the raspberry pi where the ARM core and the memory are integrated into a single chip, but my searches have yielded nothing. In fact, when I look up the SAMSUNG K4P4G324EB processor that the RPi actually uses, all I get on Samsung's website is a big set of applications processors with off chip memory.

Does anyone have any resources or locations I can go to get a decent ARM SOC with around 512MB of integrated memory?

Best Answer

Some FAE explained this to me a few years back like this:

The process for fabricating DDR memory is a completely different one than the one used for the processing unit. Also, the average life time for a DDR2 IC or DDR3 IC or whatever DDR IC is much shorter (~ 3-5 years) than the availability for the processor (10-15 years). So even if they build this package-on-package IC they couldn't guarantee the lifetime, thus reducing their marketing point.

I know what you mean, laying out the DDR2/DDR3 interface is an error-prone task and requires some very low level software digging - I personally do not like that as well.

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