Nonvolatile memory devices including lockable word line cells

Details Nonvolatile memory devices including lockable word line cells Nonvolatile memory devices including lockable word line cells

1996-12-20

1998-09-15

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Memory configuring

711103, 36518509, 36518511, 36518513, 365218, 365195, G06F 1200

Patent

active

058095535

ABSTRACT:
Nonvolatile memory devices and methods include an array of nonvolatile memory cells which are arranged in a plurality of rows and a plurality of columns. A plurality of word lines are also included, a respective one of which is connected to the nonvolatile memory cells in a respective one of a plurality of columns. A plurality of lockable cells are also included. A respective one of the lockable cells is connected to a respective one of the plurality of word lines. Each of the lockable cells stores therein a first or a second binary value. The first binary value indicates that nonvolatile memory cells which are connected to the corresponding column of word lines cannot be erased or reprogrammed. The second binary value indicates that nonvolatile memory cells which are connected to the corresponding column of words lines can be erased or programmed.

REFERENCES:
patent: 5270967 (1993-12-01), Moazzami et al.
patent: 5274599 (1993-12-01), Ema
patent: 5513136 (1996-04-01), Fandrich et al.
patent: 5737258 (1998-07-01), Choi et al.

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