From: "Jürgen Lambrecht" <J.Lambrecht@televic.com>
To: Rutger Hofman <rutger@cs.vu.nl>
Cc: Jonathan Larmour <jifl@jifvik.org>,
Ross Younger <wry@ecoscentric.com>,
eCos developers <ecos-devel@ecos.sourceware.org>
Subject: Re: Re: NAND technical review
Date: Thu, 08 Oct 2009 07:15:00 -0000 [thread overview]
Message-ID: <4ACD9191.60102@televic.com> (raw)
In-Reply-To: <4ACCC13F.40009@cs.vu.nl>
Rutger Hofman wrote:
<snip>
>>> - R's model shares the command sequence logic amongst all chips,
>>> differentiating only between small- and large-page devices. (I do not
>>> know
>>> whether this is correct for all current chips, though going forwards
>>> seems
>>> less likely to be an issue as fully-ONFI-compliant chips become the
>>> norm.)
>>>
>> Hmm. Nevertheless, this is a concern for me with R's. I'm concerned it
>> may be too prescriptive to be robustly future-proof.
>>
>
> Well, there is no way I can see into the future, but I definitely think
> that the wire command model for NAND chips is going to stay -- it is in
> ONFI, after all. Besides, all except the 1 or 2 most pioneering museum
> NAND chips use it too. There are chips that use a different interface,
> like SSD or MMC or OneNand, but then these chips come with on-chip bad
> block management, wear leveling of some kind, and are completely
> different in the way they must be handled. I'd say E's and R's
> implementations are concerned only with 'raw' NAND chips.
>
>
Correct, only for raw NAND chips to be soldered on a board. The others
have an embedded controller and are already packaged.
>> One could say that makes it a more realistic emulation. But yes I can
>> see disadvantages with a somewhat rigid world view. Thinking out loud, I
>> wonder if Rutger's layer could work with something like Samsung OneNAND.
>>
>
> See my comment above. The datasheet on e.g. KFM{2,4}G16Q2A says:
> "MuxOneNAND™‚ is a monolithic integrated circuit with a NAND Flash array
> using a NOR Flash interface."
>
>
Indeed, a oneNAND is to be threated as a NOR flash, like a pseudoSRAM is
a DRAM with SRAM interface.
And SSD has a hard disk drive interface, just like MMC and SD card; they
mostly have a FAT file system on them but also UFS ...
Kind regards,
Jürgen
next prev parent reply other threads:[~2009-10-08 7:15 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 [this message]
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
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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