NONVOLATILE SEMICONDUCTOR MEMORY DEVICE, MEMORY CONTROLLER, AND MEMORY SYSTEM

摘要

A nonvolatile semiconductor memory device includes a memory cell array that share a plurality of bit lines, each block unit including a plurality of memory cells for storing user data and at least one memory cell for storing flag data indicating whether the block unit is defective, and a control unit configured to read the flag data from a block unit during a read operation or a write operation on the block unit, and when the flag data indicates the block unit is defective, discontinue the read operation and the write operation on the block unit.

主权项

1. A nonvolatile semiconductor memory device comprising:
a memory cell array including a plurality of block units that share a plurality of bit lines, each block unit including a plurality of memory cells for storing user data and at least one memory cell for storing flag data indicating whether the block unit is defective; a control unit configured to read the flag data from a block unit during a read operation or a write operation on the block unit, and when the flag data indicates the block unit is defective, discontinue the read operation and the write operation on the block unit.