RFC: detect and manage power cut on MLC NAND

[Jeff Lauruhn (jlauruhn)]

Yes, MT29F32G08CBADAWP is available under NDA.  These are actually two different process nodes.  MT29F32G08CBADAWP is one of our latest processes.  


Jeff Lauruhn
NAND Application Engineer
Embedded Business Unit


-----Original Message-----
From: Andrea Scian [mailto:rnd4 at dave-tech.it] 
Sent: Tuesday, March 17, 2015 2:30 AM
To: Jeff Lauruhn (jlauruhn)
Cc: Boris Brezillon; Richard Weinberger; dedekind1 at gmail.com; mtd_mailinglist
Subject: Re: RFC: detect and manage power cut on MLC NAND



Dear Jeff,

Il 16/03/2015 22:11, Jeff Lauruhn (jlauruhn) ha scritto:
> Good morning Boris;
> RR is a new feature and not available on all parts few.  I'm not sure 
> about others, but since these are features, you simply enable of 
> disable via SET FEATURE/GET FEATURE.  If you already provide that 
> SET/GET FEATURE functionality then an end-user determine if their 
> device supports a feature and then write the code to enable when they 
> need it on their particular design.

I can confirm this. In fact I'm currently working with two Micron NAND:

MT29F32G08CBACAWP
MT29F32G08CBADAWP

The latter should be "just" a newer die revision of the former (at least, this is what our distributor says)

There's a technology change between the two and, in fact, the latter supports RR while there's no mention of such a feature inside rev C.

Jeff, could you please help me in understanding which if the following sentences are true and which are false?
- rev D is more "robust" than rev C because it has RR (so an additional feature that improve error correction)
- rev D is "robust" like rev C, if rev D is used with RR
- if RR is not used rev D is more error prone than rev C

I think this is crucial to understand how RR works and how much is needed inside MTD/UBI code.
I hope that the above information are not under NDA ;-)

Thanks in advance,

--

Andrea SCIAN

DAVE Embedded Systems