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A constrained memory is a storage device whose elements change their states under some constraints. A typical example is flash memories, in which cell levels are easy to increase but hard to decrease. In a general rewriting model, the stored data changes with some pattern determined by the application. In a constrained memory, an appropriate representation is needed for the stored data to enable efficient...
Floating codes are codes designed to store multiple values in a write asymmetric memory, with applications to flash memory. In this model, a memory consists of a block of n cells, with each cell in one of q states {0,1, . . .,q - 1}. The cells are used to represent k variable values from an lscr-ary alphabet. Cells can move from lower values to higher values easily, but moving any cell from a higher...
Flash memory is a non-volatile computer memory comprised of blocks of cells, wherein each cell can take on q different levels corresponding to the number of electrons it contains. Increasing the cell level is easy; however, reducing a cell level forces all the other cells in the same block to be erased. This erasing operation is undesirable and therefore has to be used as infrequently as possible...
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