Method and apparatus for preventing unauthorized access to nonvo

Details Method and apparatus for preventing unauthorized access to nonvo Method and apparatus for preventing unauthorized access to nonvo

1996-03-05

1997-10-07

Nelms, David C.

Static information storage and retrieval

Floating gate

Data security

365195, 365196, 365228, 235382, 34082531, 34082534, G11C 1606

Patent

active

056755341

ABSTRACT:
According to the present invention, a method is provided for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented. In one embodiment, the method includes the steps of writing a first set of data to the non-volatile memory; generating a voltage detect signal during the writing, the voltage detect signal being representative of a source voltage applied to the non-volatile memory; determining whether the writing was successful by evaluating the voltage detect signal; and reading data from the non-volatile memory responsive to the determination.

REFERENCES:
patent: 5301161 (1994-04-01), Landgraf et al.
patent: 5554977 (1996-09-01), Jablonski et al.

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