* AND Flash
@ 2002-04-04 15:31 Allen Curtis
2002-04-04 18:45 ` Russ Dill
2002-04-04 20:26 ` Charles Manning
0 siblings, 2 replies; 3+ messages in thread
From: Allen Curtis @ 2002-04-04 15:31 UTC (permalink / raw)
To: linux-mtd
Does anyone have experience with AND flash? Does MTD support it?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: AND Flash
2002-04-04 15:31 AND Flash Allen Curtis
@ 2002-04-04 18:45 ` Russ Dill
2002-04-04 20:26 ` Charles Manning
1 sibling, 0 replies; 3+ messages in thread
From: Russ Dill @ 2002-04-04 18:45 UTC (permalink / raw)
To: acurtis; +Cc: linux-mtd
On Thu, 2002-04-04 at 08:31, Allen Curtis wrote:
> Does anyone have experience with AND flash? Does MTD support it?
>
I think you might be looking for NAND flash (which MTD supports)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: AND Flash
2002-04-04 15:31 AND Flash Allen Curtis
2002-04-04 18:45 ` Russ Dill
@ 2002-04-04 20:26 ` Charles Manning
1 sibling, 0 replies; 3+ messages in thread
From: Charles Manning @ 2002-04-04 20:26 UTC (permalink / raw)
To: acurtis, linux-mtd
> Does anyone have experience with AND flash? Does MTD support it?
You're looking at the Hitachi stuff right?
I have not used it, but I have had a good sniff around it when evaluating it
as a storage option against various others. NAND won in the end for the
following reasons:
* Simpler interface. The AND chips required some funky extra clocks.
* Cost: NAND prices started to fall rapidly. I believe they are now cheaper.
* Multi-source: As far as I can tell only Hitachi does AND. ie. supply
concerns.
* Supply concerns: AND uptake by the market is uncertain, leading to future
availability concerns.
Functionally AND is much the same as NAND. ie. page/block oriented stuff.
At the start of the investigation, AND had appeal because it was the cheapest
per bit. Since then however, NAND (Samsung/Toshiba) prices have fallen
dramatically and densities are increasing. This, I attribute largely to
Smartmedia uptake. As NAND rides the Smartmedia consumer wave, I expect to
see further price drops and density increases. Unless AND gets a similar
boost I expect it to fade away.
Without having investigated things too far, I'd expect AND to be able to slot
into mtd rather neatly as a NAND variant. AND commands are likely not the
same, but equivalent ones exist.
IMHO
-- Charles
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-04-04 18:45 ` Russ Dill
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