Method and apparatus for protecting data stored in flash memory

Details Method and apparatus for protecting data stored in flash memory Method and apparatus for protecting data stored in flash memory

1995-12-29

1997-01-14

Nelms, David C.

Static information storage and retrieval

Floating gate

Data security

36518533, 365226, 365228, G11C 1134

Patent

active

055946860

ABSTRACT:
A method and apparatus for protecting data stored in a nonvolatile memory. First, a locking signal is initiated to indicate to the memory that write and erase operations are to be prevented. Next, in response to this locking signal, the supply voltage that supports write and erase operations in the memory is lowered below a threshold value. In doing so, protection circuitry that is contained within the memory prevents write and erase operations in the memory.

REFERENCES:
patent: 4975883 (1990-12-01), Baker et al.
patent: 5509134 (1996-04-01), Fandrich et al.

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