Nonvolatile memory with blocks and circuitry for selectively pro

Details Nonvolatile memory with blocks and circuitry for selectively pro Nonvolatile memory with blocks and circuitry for selectively pro

1994-12-19

1996-04-30

Clawson, Jr., Joseph E.

Static information storage and retrieval

Floating gate

Data security

36518509, 36518511, 36518522, 36518805, 365195, 365196, 36523008, G11C 1606

Patent

active

055131360

ABSTRACT:
A nonvolatile memory comprises a memory array and a control circuit coupled to the memory array for performing memory operations with respect to the memory array. A storage circuit associated with the memory array is provided for storing a data. When the data is stored in the storage circuit, the memory array is locked from being accessed for the memory operations. A logic circuit is coupled to the control circuit and the storage circuit for preventing the control circuit from accessing the memory array with respect to the memory operations in accordance with the data. The logic circuit prevents the control circuit from accessing the memory array when the storage circuit stores the data. A control input is provided for receiving a control signal. The control signal is applied to the logic circuit and can be in a first voltage state and a second voltage state. When the control signal is in the first voltage state, the logic circuit is enabled to lock the memory array with respect to the memory operations in accordance with the data stored in the storage circuit. When the control signal is in the second voltage state, the logic circuit is disabled to lock the memory array and the memory array is allowed for the memory operations regardless of the data stored in the storage circuit.

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