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A Bid to Simplify Flash Subsystem Design
by Bryon Moyer, IC Design and Verification Journal
Flash memory, once exotic and expensive, has followed in DRAM’s steps to become a familiar everyday technology. Even more than DRAM perhaps: when was the last time you went to a drug store and picked up a DRAM card while you were there?
As with DRAM, this has been motivated by price decreases: the price per megabyte of Flash is falling by roughly half every year, and volume has responded with a compound annual growth rate of about 170%, according to Denali Software, Inc. Couple this with the fact that Flash is non-volatile, and, well, it’s no surprise that it’s being found not only in camera storage cards and cell phones, but is now becoming a part of the memory subsystem in computing platforms.
One technology advance that has made this reduction in price possible is the development of the Multi-Level Cell (MLC). Traditional Flash used a Single-Level Cell (SLC), which is the standard kind of memory bit we’re used to – one bit per cell, either on or off. [more]
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