Charge Trap Flash - MirrorBit Flash Memory

MirrorBit Flash Memory

Spansion’s MirrorBit Flash and Saifun’s NROM are two flash memories that use a charge trapping mechanism in nitride to store two bits onto the same cell effectively doubling the memory capacity of a chip. This is done by placing charges on either side of the charge trap layer. The cell is read by using forward and reverse currents through the channel to read either side of the charge trap.

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Charge Trap Flash - MirrorBit Flash Memory - Reading 2 Bits From The Cell
... The MirrorBit read is performed very simply by reversing the source and drain contacts ... The junction depletion region extending from the drain side shields the channel from the charge on the side of the charge trapping cell that overlies the drain ...

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