Nand Flash: SLC, MLC and TLC, how much do you know?
Part 1 - Principle of Nand Flash Storage (Basic architecture of a Cell) As we know that all the data store as “0” and “1” in computers, so in theory if the storage unit can provide two or more recognized status, it can be used for data recording. 1. “Write” Data When writing data, we need to apply high voltage to the Control Gate , and allowing electrons flows into the N-Channel which is between the Source and Drain , when the current is strong enough, electrons gain sufficient energy and then will cross the SiO2 layer (which is under the Floating Gate ), finally being captured by the Cell, we call the whole process as “ Tunnel Effect ”. 2. Data Stabilization Once the electrons enter into the Floating Gate, they can’t get away from the SiO2 layer if there is not enough energy, even turn off the power supply, then the statue o...