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The type of determinable characteristic used to store data in a memory cell may vary depending on the type of memory or storage technology used. For example, in flash memory cells in which each memory cell comprises a transistor having a source lead, a drain lead and a gate, the determinable characteristic is a voltage level that when applied to the gate causes the memory cell to conduct a current between the drain and the source leads. The voltage level, in this example, is referred to herein as a threshold voltage. A threshold voltage may also be referred to as a control gate reference voltage (CGRV), read voltage, or reference voltage.

Added by DJM 12 2021