Design Con 2015
Breaking News
Comments
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?

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.

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
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.

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 9:50:07 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 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

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.

 



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

Want to Present a Paper at ESC Boston 2015?
Max Maxfield
8 comments
I tell you, I need more hours in each day. If I was having any more fun, there would have to be two of me to handle it all. For example, I just heard that I'm going to be both a speaker ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
Post a comment
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
12 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Martin Rowe

Book Review: Controlling Radiated Emissions by Design
Martin Rowe
1 Comment
Controlling Radiated Emissions by Design, Third Edition, by Michel Mardiguian. Contributions by Donald L. Sweeney and Roger Swanberg. List price: $89.99 (e-book), $119 (hardcover).