 That year, AMD (in a division later spun off as Spansion) announced a new flash memory technology it called “MirrorBit.” Spansion used this product to reduce manufacturing costs and extend the density range of NOR Flash memory past that of conventional NOR flash and to match the cost of the multi-level cell NOR flash being manufactured by Intel.The MirrorBit cell uses a charge trapping layer not only as a substitute for a conventional floating gate, but it also takes advantage of the non-conducting nature of the charge storage nitride to allow two bits to share the same memory cell.Shown in Figure 1 the bits reside at opposite ends of the cell and can be read by running a current through the channel in different directions.