Patent ID: 7453727

Claim:
A nonvolatile semiconductor memory comprising: a memory cell array which includes a plurality of main cell arrays and a plurality of redundancy cell arrays; and a replacement data cell array which stores a replacement data indicating a replacement of one of said plurality of main cell arrays by one of said plurality of redundancy cell arrays, wherein said replacement data cell array includes: a plurality of first storage sections, each of which corresponds to one of said plurality of redundancy cell arrays and stores a replacement confirmation data indicating whether or not said corresponding one of the plurality of redundancy cell arrays replaces one of said plurality of main cell arrays, by nonvolatile memory cells of two bits, and a plurality of second storage sections, each of which corresponds to one of said plurality of redundancy cell arrays and stores an address data indicating an address for one of said plurality of main cell arrays which is replaced by said corresponding one of the plurality of redundancy cell arrays.