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Old 04-28-2010, 05:23 PM
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Default Flash Memory Transistor count?

I just got to thinking for some random reason today... How many transistors does a flash memory chip have (like that in an SD card)? Would an 8GB chip contain 64 billion transistors; one for each bit of information? If so they would have to be stacked vertically somehow right? I mean Fermi, with "merely" 3.1 Billion transistors or so is larger than an SD card by itself.
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Old 04-28-2010, 05:51 PM
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For MLC (like SD), divide the number of bits by half (2 bits stored per cell). That's still 32 billion for an 8 GB chip, and will still reach over 100 billion for 32 GB SD cards.

I've never given it any thought, but now it's intriguing. Most SSDs on the market use somewhere around 8 GB flash ICs in their drives and will likely increase the size in the future, which adds up to huge transistor counts.
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Old 04-28-2010, 07:51 PM
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Quote:
Originally Posted by phaxmohdem View Post
I mean Fermi, with "merely" 3.1 Billion transistors or so is larger than an SD card by itself.
Certain circuits are much denser than others. NAND flash is probably one of the densest out of all of production grade technology. The least densest circuitry lies in the processing core of the CPU, and well, maybe the I/O devices like memory controllers.

Cache is much denser than CPU logic, but they use 6 transistors. NAND flash only needs 1. Even then, real world differences are MUCH greater.

IMFT 4GB 34nm Flash die: http://www.anandtech.com/show/2928

172mm2 for 4GB

Intel 32nm SRAM wafer 291Mbit(36.375MBytes): 1.9 billion transistors, likely near 100mm2. Intel's 90nm wafer had 52Mbit test chips with 109mm2 die. Transistor for transistor, mm2 for mm2, MB for MB flash is 10x dense than 6T SRAM used in caches.

Last edited by DavidC1; 04-28-2010 at 07:57 PM.
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Old 05-05-2010, 11:21 AM
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While we are at it how many transistors would the "uncore" of the Flash memory chip take? I know it is probably pretty insignificant in comparison but I was just wondering (but not enough to go look it up and work it out )
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