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JanineLove
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re: The Future of NOR flash memory
JanineLove   5/2/2011 12:45:45 PM
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Spansion will be presenting a version of this paper this week at ESC. If you have any questions for the author, feel free to post a comment below.

ManasK.RayChaudhuri
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re: The Future of NOR flash memory
ManasK.RayChaudhuri   12/7/2011 4:41:56 AM
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Please give a detailed presentation & not a sketchy one.

resistion
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re: The Future of NOR flash memory
resistion   5/2/2011 3:26:51 PM
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Good to see an assertion of NOR applications. But is the market size large enough to drive any significant usage changes?

Cliff.Zitlaw
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re: The Future of NOR flash memory
Cliff.Zitlaw   5/3/2011 5:59:01 PM
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One significant NOR usage change is the continuing proliferation of high density SPI. As a NVM product catagory, NOR revenue is more than adequate to fund next generation process development and new product catagories.

cdhmanning
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re: The Future of NOR flash memory
cdhmanning   5/2/2011 7:02:02 PM
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Read, read, read... No mention of write. Has NOR write time improved or is it as bad as it always has been?

Cliff.Zitlaw
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re: The Future of NOR flash memory
Cliff.Zitlaw   5/3/2011 6:12:51 PM
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We have made significant improvements in programming performance. Spansion's GL-S product family programs at 1.2MB/s compared to the previous generation GL-P programming rate of 130KB/s.

nosubject
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re: The Future of NOR flash memory
nosubject   5/2/2011 8:29:44 PM
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In the last comparison, 100MHz NOR bus rate (16b bus) 50MHz NAND bus rate (8b bus) Why don't use the same freq and bus width to do comparison?

tb1
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re: The Future of NOR flash memory
tb1   5/2/2011 11:05:06 PM
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NAND parts typically don't come with a 16 bit bus and their bus rate is typically slower than the NOR parts. So the comparison seems to take these differences into account.

cdhmanning
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re: The Future of NOR flash memory
cdhmanning   5/3/2011 10:35:48 PM
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16 bit buses are quite common on NAND.

Cliff.Zitlaw
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re: The Future of NOR flash memory
Cliff.Zitlaw   5/3/2011 6:03:24 PM
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I tried to use a typical usage case scenarios. As tb1 mentions x16 NAND is getting hard to find and commands a significant price premium. Note that even if the NAND transfer time were eliminated altogether the NOR:NAND comparision would be 50:1.

cdhmanning
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re: The Future of NOR flash memory
cdhmanning   5/3/2011 10:41:30 PM
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I think the major flaw in that argument is that NAND and NOR are typically used for very different purposes and there are very few typical user scenarios for both beyond holding boot code/data. Trying to compare them is like trying to compare a Ford F250 with a Porche. NAND is prefered for general r/w file system usage - for which NOR is pretty terrible. NOR is prefered for boot code and data, but many systems are dropping the NOR and using NAND to reduce costs. That slows boot, but is a compromise.

hank.carey
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re: The Future of NOR flash memory
hank.carey   5/3/2011 5:21:17 PM
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Posted article was truncated. From the concluding sentence: "...pin count interfaces, long product life cycles and superior..."

JanineLove
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re: The Future of NOR flash memory
JanineLove   5/3/2011 5:34:16 PM
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Fixed! Thanks for letting me know.

t.alex
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re: The Future of NOR flash memory
t.alex   5/7/2011 12:43:00 AM
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Is there any chance NOR will replace NAND in the near future?

Cliff.Zitlaw
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re: The Future of NOR flash memory
Cliff.Zitlaw   5/13/2011 3:49:36 PM
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NAND array architecture is fundamentally more efficient (bits/area) than NOR at a given process node. This array efficiency advantage outweighs NOR's smaller peripheral area as densities increase. From a silicon cost perspective NAND will always be less expensive at the highest densities, NOR will always be less expensive at the lowest densities. So from a cost perspective both NOR and NAND will continue to be viable for the foreseeable future. From a performance perspective both technologies have characteristics that are essential in different applications. (NOR - low latency reads, NAND - fast program/erase rates)

leosteinfeld
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what about consumption?
leosteinfeld   9/26/2013 4:41:55 PM
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Hi,
I'm interested in Flash energy consumption to complete a fair comparison between different technologies (particularly in NOR and NAND Flash, SRAM). This parameter is normally disregarded in books and so on. Please could you give any clue on orders of magnitude of the static consumption (specified as current/power leakage) and dynamic consumption during random read operation.
Best regards,
Leonardo



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