Introduction to Flash Memory

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Introduction to Flash Memory

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Introduction to Flash Memory. Leon Romanovsky [email protected] www.leon.nu. January 13, 2013. Leon Romanovsky [email protected]. Flash Memory ...

Introduction to Flash Memory Leon Romanovsky [email protected] www.leon.nu

January 13, 2013

Leon Romanovsky [email protected]

Flash Memory

Disclaimer

Everything in this lecture shall not, under any circumstances, hold any legal liability whatsoever. Any usage of the data and information in this document shall be solely on the responsibility of the user. This lecture is not given on behalf of any company or organization.

Leon Romanovsky [email protected]

Flash Memory

Definition

Flash memory is a non-volatile storage device that can be electrically erased and reprogrammed.

Leon Romanovsky [email protected]

Flash Memory

Major Markets

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Flash Memory

Jiroft Inscription - 2600 BCE

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Flash Memory

EPROM, Dov Frohman, Intel - 1971

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Flash Memory

F-N Tunneling Floating Gate, Dr. Eli Harari - 1978

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Flash Memory

NOR/NAND Memory Patent, Dr. Fujio Masuoka - 1981

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Flash Memory

Storage Flash Solution, Sandisk - 1988

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Flash Memory

NOR Flash Random, direct access interface. Fast random reads. Slow erase/writes.

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Flash Memory

NAND Flash Higher density, lower cost. Fast erase/write. Block input/output access.

Leon Romanovsky [email protected]

Flash Memory

Single, Multi, and 3-bit Level Flash Cells

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Flash Memory

Block Level Access Minimal working unit, depends on size/technology. No read/write operation simultaneously. Erasing a block sets all bits to 1. Programming changes bits from 1 to 0.

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Flash Memory

Data Retention Finite number of P/E cycles. Wear leveling. Bad block management.

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Flash Memory

Write Amplification write amplification factor =

data that controller has to write data that host wants to write

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Flash Memory

Write and Read Disturb

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Flash Memory

Summary

block-level access wear leveling read disturb bad blocks management garbage collection different physics different interfaces

Leon Romanovsky [email protected]

Flash Memory

Sources

http://persianwondersvideo.blogspot.co.il/2007/ 02/jiroft.html http://en.wikipedia.org/wiki/Eprom http://en.wikipedia.org/wiki/Flash_memory

http://www.monolithic3d.com/2/post/2011/11/ what-can-we-learn-from-the-success-of-eli-harari-and-s html

Leon Romanovsky [email protected]

Flash Memory