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Comparativa e specifiche sulle Compact Flash Industriali

SLC vs. MLC: An Analysis of Flash Memory


3. Single-Level Cell (SLC) Flash

As the name suggests, SLC Flash stores one bit value per cell, which basically is a voltage level. The bit value is interpreted as a "0" or a "1".


Table 2: SLC Levels
Value State
0 Programmed
1 Erased

Since there are only two states, it represents only one bit value. As seen in Table 2, each bit can have a value of "programmed" or "erased".
Figure 3: Voltage Reference for SLC
A "0" or "1" is determined by the threshold voltage Vt of the cell. The threshold voltage can be manipulated by the amount of charge put on the floating gate of the Flash cell. Placing charge on the floating gate will increase the threshold voltage of the cell. When the threshold voltage is high enough, around 4.0V, the cell will be read as programmed. No charge, or threshold voltage < 4.0V, will cause the cell to be sensed as erased.

SLC Flash is used in commercial and industrial applications that require high performance and long-term reliability. Some applications include industrial grade Compact Flash cards or Solid State Drives (SSDs).