From: Jonathan Larmour <jifl@jifvik.org>
To: "Jürgen Lambrecht" <J.Lambrecht@televic.com>
Cc: eCos developers <ecos-devel@ecos.sourceware.org>
Subject: Re: NAND technical review
Date: Mon, 12 Oct 2009 01:13:00 -0000 [thread overview]
Message-ID: <4AD2829B.3050807@jifvik.org> (raw)
In-Reply-To: <4ACD9FC3.1030508@televic.com>
Jürgen Lambrecht wrote:
> Ross Younger wrote:
>> Now, I mentioned ECC data. NAND technology has a number of underlying
>> limitations, importantly that it has reliability issues. I don't have
>> a full
>> picture - the manufacturers seem to be understandably coy - but my
>> understanding is that on each page, a driver ought to be able to cope
>> with a
>> single bit having flipped either on programming or on reading. The
>>
>
> Such a "broken bit" is because the transistor that contains the bit is
> physically broken, and is stuck at 1 or at 0 (I don't know if it can be
> both). So you cannot anymore erase it (flip it back to 1) or program it
> (flip to 0).
>
> I thought only programming or erasing could break it, not reading?
> Is somebody sure about this?
I've had experience of dodgy flash that spontaneously started getting bit
errors either over time or on reads - couldn't tell which. Really it was
NOR, rather than NAND, but that should be /more/ reliable! I think it's
probably best to assume that if it's hardware, it can go wrong :-).
[ NB I'll be replying to other mails in this thread tomorrow, but it's a
bit late here at the moment for me to start ]
Jifl
--
--["No sense being pessimistic, it wouldn't work anyway"]-- Opinions==mine
next prev parent reply other threads:[~2009-10-12 1:13 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-02 15:51 Jonathan Larmour
2009-10-06 13:51 ` Ross Younger
2009-10-07 3:12 ` Jonathan Larmour
2009-10-07 16:22 ` Rutger Hofman
2009-10-08 7:15 ` Jürgen Lambrecht
2009-10-15 3:53 ` Jonathan Larmour
2009-10-15 11:54 ` Jürgen Lambrecht
2009-10-15 3:49 ` Jonathan Larmour
2009-10-15 14:36 ` Rutger Hofman
2009-10-16 1:32 ` Jonathan Larmour
2009-10-19 9:56 ` Ross Younger
2009-10-19 14:21 ` Rutger Hofman
2009-10-20 3:21 ` Jonathan Larmour
2009-10-20 12:19 ` Rutger Hofman
2009-10-21 1:45 ` Jonathan Larmour
2009-10-21 12:15 ` Rutger Hofman
2009-10-23 14:06 ` Jonathan Larmour
2009-10-23 15:25 ` Rutger Hofman
2009-10-23 18:03 ` Rutger Hofman
2009-10-27 20:02 ` Rutger Hofman
2009-11-10 7:03 ` Jonathan Larmour
2010-12-11 19:18 ` John Dallaway
2010-12-22 14:54 ` Rutger Hofman
2009-10-15 15:43 ` Rutger Hofman
[not found] ` <4ACDF868.7050706@ecoscentric.com>
2009-10-09 8:27 ` Ross Younger
2009-10-13 2:21 ` Jonathan Larmour
2009-10-13 13:35 ` Rutger Hofman
2009-10-16 4:04 ` Jonathan Larmour
2009-10-19 14:51 ` Rutger Hofman
2009-10-20 4:28 ` Jonathan Larmour
2009-10-07 9:40 ` Jürgen Lambrecht
2009-10-07 16:27 ` Rutger Hofman
2009-10-13 2:44 ` Jonathan Larmour
2009-10-13 6:35 ` Jürgen Lambrecht
2009-10-15 3:55 ` Jonathan Larmour
2009-10-13 12:59 ` Rutger Hofman
2009-10-15 4:41 ` Jonathan Larmour
2009-10-15 14:55 ` Rutger Hofman
2009-10-16 1:45 ` Jonathan Larmour
2009-10-19 10:53 ` Ross Younger
2009-10-20 1:40 ` Jonathan Larmour
2009-10-20 10:17 ` Ross Younger
2009-10-21 2:06 ` Jonathan Larmour
2009-10-22 10:05 ` Ross Younger
2009-11-10 5:15 ` Jonathan Larmour
2009-11-10 10:38 ` Ross Younger
2009-11-10 11:28 ` Ethernet over SPI driver for ENC424J600 Ilija Stanislevik
2009-11-10 12:16 ` Chris Holgate
2009-11-12 18:32 ` NAND technical review Ross Younger
2009-10-13 14:19 ` Rutger Hofman
2009-10-13 19:58 ` Lambrecht Jürgen
2009-10-07 12:11 ` Rutger Hofman
2009-10-08 12:31 ` Ross Younger
2009-10-08 8:16 ` Jürgen Lambrecht
2009-10-12 1:13 ` Jonathan Larmour [this message]
2009-10-16 7:29 ` Simon Kallweit
2009-10-16 13:53 ` Jonathan Larmour
2009-10-19 15:02 ` Rutger Hofman
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