Breaking News
News & Analysis

Korea Drives High-End, Low-End Memory at ISSCC

11/5/2013 06:00 AM EST
3 comments
NO RATINGS
More Related Links
View Comments: Newest First | Oldest First | Threaded View
chipmonk0
User Rank
CEO
Re: Memory stacks
chipmonk0   2/11/2014 3:26:57 PM
NO RATINGS
Everyone seems to be backing off from putting a stack of memory chips directly on top of a processor ( per the original JEDEC wide I/O spec ) because of yield, logistics, KGD, thermal -- whatever.

But at least by stacking DRAM chips w/ TSVs they are shrinking the distance btwn individual chips on DIMMs and just about eliminating sync-ing / latency due to chip to chip propagation delay.

both Micron HMC and now HBM ( its a JEDEC std. not just SK Hynix ) put the memory stack off the processor but on the same PCB, or substrate / interposer be it organic / Si. So the resut is either 2-d or 2.5-d with the memory in 3-d, not a pure 3-d

Micron's HMC memory chip stack includes a controller logic chip - all vertically connected by Thru Si Vias (TSVs). The stack sits off the CPU and is connected to it by SerDes.

At least right now, its aimed at the high end, FPGAs, Network Controllers that sort of thing

A certain mass market GPU vendor did n't like this configuration ( not willing to pay for the controller chip )

SK Hynix must have heard that complaint.

So their HBM is just a stack of memory ( w/ the controller chip optional ) all hooked up by TSVs, sits off the CPU / GPU, connected to it by parallel I/O with regular drivers ( as it stands now ) with the bandwidth 20 % slower at 128 GBps.

 

krisi
User Rank
CEO
0.064mm2 sram cell
krisi   11/5/2013 4:18:18 PM
NO RATINGS
Amazing small cell size...looks like Moore's law still holds

rick merritt
User Rank
Author
Memory stacks
rick merritt   11/5/2013 2:02:22 PM
NO RATINGS
I am hungry to hear what folks are doing with Micron and SK Hynix memory cubes/stacks. How is this different from 2.5-D stacks with a processor and memory on an interposer? What are the trade offs?

Most Recent Comments
Wnderer
 
David Ashton
 
mikehibbett
 
dwhess
 
David Ashton
 
LarryM99
 
David Ashton
 
mikehibbett
 
goafrit
Radio
NEXT UPCOMING BROADCAST
How to Cope with a Burpy Comet
October 17, 2pm EDT Friday
EE Times Editorial Director Karen Field interviews Andrea Accomazzo, Flight Director for the Rosetta Spacecraft.
August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed