Breaking News
Comments
Newest First | Oldest First | Threaded View
TanjB
User Rank
Rookie
Re: No more density expectations
TanjB   8/8/2014 9:29:30 PM
NO RATINGS
@resition That is an unusually through review, quite interesting.

SSD controllers have a history of being stripped down to basics.  A couple of years ago they were typically an ARC processor, stepped up to ARM these days.  The ECC is a major IP block but it probably is more a problem of having rights to a competent design than it is a large number of gates.

In the PCIe era we are going to see "ordinary" drives in the 1TB range have thruputs in the 1.5 to 2.0 GB/s range, about 3x faster than SATA-3.  The NVMe command set is inherently efficient to handle, but still the controller will need to track the sector mappings, plan block erases in advance, infer sequentiality in user patterns, monitor wear levelling, as well as move data.  So we might see some pressure to move to the 28..35 nm range, probably an LP process, in the next wave of controllers.  Especially as the flood gates seem to have opened for 28nm capacity and new chips seem to come out every day.  With more mature design pipeline and less cost/delay on production it won't be long.

I wonder what Novachips is using for the HLSSD controller?  That seems pretty fancy.

 

krisi
User Rank
CEO
Re: No more density expectations
krisi   8/7/2014 10:19:50 AM
NO RATINGS
thank you @resistion...I just thought that few millions gates would be sufficient for the controller implementation so there is no need to go down to 28nm

resistion
User Rank
CEO
Re: No more density expectations
resistion   8/7/2014 9:50:07 AM
NO RATINGS
Hi Kris, one controller I checked(http://www.tomshardware.com/reviews/jmicron-jmf667h-ssd-benchmark,3834.html) is made with 55nm, the only reason why further scaling came up is previous post sw guy noted that controller scaling is one way to address slowdown of cost reduction from need for more advanced controllers.

krisi
User Rank
CEO
Re: No more density expectations
krisi   8/7/2014 9:45:09 AM
NO RATINGS
are controllers really that advanced in manucturing? one generation away from 28nm...I would think 65nm or 90nm would be more than sufficient for any controller, how many gates do you need?

resistion
User Rank
CEO
Re: No more density expectations
resistion   8/7/2014 9:19:10 AM
NO RATINGS
Agreed. Controllers are one or two generations away from 28 nm. The more demands, the faster they'll get there.

sw guy
User Rank
Manager
Re: No more density expectations
sw guy   8/7/2014 7:05:58 AM
NO RATINGS
Could be, at least partialy, compensated by the fact that controller is until now poised to take full benefit of shrinkage.

Nevertheless, I too have the feeling flash is the only sector I know where manufacters are proud to annouce new *less* reliable product.

resistion
User Rank
CEO
No more density expectations
resistion   8/6/2014 10:23:25 PM
NO RATINGS
Whether direct shrinking, more bits per cell, or more vertical layers, the complexity and associated cost is countering the normally expected decrease of cost per bit. The bit quality is degraded. So of course, managing so many bits in one place would place a lot of demand on the controller. The controller cost should therefore be considered in the system cost to be fair. Then flash won't look so cheap anymore.

rick merritt
User Rank
Author
Leveraging the flash controller
rick merritt   8/6/2014 2:33:23 PM
NO RATINGS
I'd like to hear wha folks think about the smart flash initiative Samsung is driving at SNIA, NVMe, etc.

Can we access the many flash controllers in a data center to do other jobs or will this be a mess that goes no where...or?



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

Steve Wozniak Reacts to Latest iPhone
Max Maxfield
7 comments
Funnily enough, just a few days ago as I pen these words, I was chatting with my wife (Gina the Gorgeous) when she informed me that -- as a kid -- she had never played at making a ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
20 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
15 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
46 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)