Synchronous, asynchronous and toggle-mode NAND

Can you compare synchronous and asynchronous NAND in terms of price and performance? And what is each typically used for?

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Synchronous and asynchronous NAND, based on spec sheets, look remarkably similar in performance. However, they aren't, and the differences are non-trivial.

Synchronous NAND utilizes both the rise and fall of the signal wave to move data, giving it a potential of more than twice the performance than asynchronous (analogous to double-data-rate DRAM or DDR). Real-world numbers prove a much lower difference that ranges from 10 to 100% better performance depending on application.

Synchronous NAND is more expensive than asynchronous. Sync NAND is used when performance is everything, such as with gaming systems.

Also, what is toggle-mode MLC and what is it typically used for?

Toggle-mode MLC is asynchronous NAND that is supposed to provide similar performance as synchronous NAND, but at a lower price. Independent testing has not verified these claims yet. Toggle-mode MLC is also known as double-data-rate asynchronous NAND.

This was first published in June 2013

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