Multilevel semiconductor memory, write/read method...

Details Multilevel semiconductor memory, write/read method... Multilevel semiconductor memory, write/read method...

2006-11-21

2006-11-21

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Address formation

Address mapping

C711S006000, C365S185030

Reexamination Certificate

active

07139895

ABSTRACT:
A disclosed semiconductor memory device includes multilevel memory cells in which data in the cells is arranged according to a coding method that allows error correction. One disclosed device has multilevel memory cells arranged so as to correspond to a physical address space, each cell storing 2nlevels of data, each expressed by n (n≧2) number of bits (X1, X2, Xn). When an input logical address is converted into a physical address, a determination is made whether the logical address space matches the physical address space. If there is not a match, the most significant bit X1is specified once using a reference value, and the specified bit is output from one of the cells corresponding to the physical address. If there is not match, the bits (X2, . . . , Xn) are specified by an n—time specifying operation using maximum n number of different reference values.

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