eDRAM too expensive

By: Dan Fay (daniel.fay.delete@this.gmail.com), January 14, 2019 3:16 pm
Room: Moderated Discussions
Maynard Handley (name99.delete@this.name99.org) on January 14, 201
> > It's not about "10% higher cost than SRAMs" because eDRAM
> > is denser. It simply adds layers and steps that are
> > only needed for eDRAM and increase the cost of the whole wafer. If your die would've been 80% SRAM then the
> > smaller dies with eDRAM might very well be cheaper. But saving 5 mm² on a 100+ mm² die is a net loss.
>
> This is not answering the question, it's simply repeating what David said, in a louder voice.
>
> HOW MANY ADDITIONAL LAYERS and STEPS?
> HOW MUCH more expensive?

This is a *really* old article, but IBM estimates here ~20% more:

https://www.edn.com/electronics-news/4336936/IBM-Pushes-eDRAM-as-SRAM-Replacement

They claim here 3 more masks. I don't know if they're "critical layers" though. If they are, you might have to double or quadruple that number.

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