Breaking News
Comments
Newest First | Oldest First | Threaded View
David Brown
User Rank
Rookie
re: Memory-cube group issues initial draft specs
David Brown   8/16/2012 8:41:57 AM
NO RATINGS
Why would you want a DRAM controller in a processor? The DRAM controller handles things like timings for the different row selects, bank access, refresh, etc. You want these as close to the DRAM chip as possible. The reason memory controllers became integrated into processors is not because that's the best place for them - it was to avoid the extra chip, buses and latency caused by having the controller on a separate device between the processor and the memory (and sharing bus bandwidth with PCI and other buses). The reason the controller is not in the DRAM chips today is because the chip process needed for controller logic is very different from that needed for the DRAM cells, so it would be hugely expensive to put them on the same die. If you put the memory controller inside the DRAM cube, then the bus between the processor and the memory can be simpler and faster, and the memory controller can be more optimal for the dram banks it is controlling (including wider bus access and local cache inside the cube). The potential here is not just to increase bandwidth, but also to lower latency - especially in servers with large memories and ECC.

Wayman
User Rank
Rookie
re: Memory-cube group issues initial draft specs
Wayman   8/16/2012 6:36:23 AM
NO RATINGS
For Wide I/O, I suppose the target should be 12.8GBytes/s which is proposed by Intel.

rick merritt
User Rank
Author
re: Memory-cube group issues initial draft specs
rick merritt   8/15/2012 4:15:47 AM
NO RATINGS
Yes, Intel, AMD, HP and Oracle--basically the computer industry outside IBM--has been silent so far on its 3-D memory strategy. Presumably they are headed down the Jedec route.

resistion
User Rank
CEO
re: Memory-cube group issues initial draft specs
resistion   8/14/2012 11:47:31 PM
NO RATINGS
Agreed, so Intel not participating is important to wonder about.

Rchandta1
User Rank
Rookie
re: Memory-cube group issues initial draft specs
Rchandta1   8/14/2012 9:23:45 PM
NO RATINGS
Agreed stacking DRAMs has advantage. But I can't understand the rest. It is tightly coupled with the memory controller, so there is power and latency benefits. But it seems to force the processor away from the memory controller. Many processors have integrated DRAM controllers; so the stacking scheme seems to negate their advantage.

rick merritt
User Rank
Author
re: Memory-cube group issues initial draft specs
rick merritt   8/14/2012 6:29:00 PM
NO RATINGS
Yes the Memory Cube is for DRAM not flash. My mistake. The story above has been corrected.

zanfar
User Rank
Rookie
re: Memory-cube group issues initial draft specs
zanfar   8/14/2012 3:20:11 PM
NO RATINGS
It was my understanding that the HMC consortium was primarily concerned with DRAM memory--not Flash. http://www.hybridmemorycube.org/technology.html

resistion
User Rank
CEO
re: Memory-cube group issues initial draft specs
resistion   8/14/2012 12:34:37 PM
NO RATINGS
Seems the TSV bandwidth is wasted on flash.



EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Creating a Vetinari Clock Using Antique Analog Meters
Max Maxfield
55 comments
As you may recall, the Mighty Hamster (a.k.a. Mike Field) graced my humble office with a visit a couple of weeks ago. (See All Hail the Mighty Hamster.) While he was here, Hamster noticed ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
11 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
11 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
45 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)