Rom data read protect circuit

Details Rom data read protect circuit Rom data read protect circuit

1999-03-26

2000-09-26

Tran, Andrew Q.

Static information storage and retrieval

Floating gate

Data security

365195, 36518907, G11C 1606

Patent

active

061250546

ABSTRACT:
A ROM data read protect circuit according to the present invention comprises a non-volatile memory that stores a data for allowing or inhibiting reading of the ROM data and a logic circuit for control for controlling allowing or inhibiting of an operation for reading of data in a ROM according to the data stored in the non-volatile memory. When "0" is written in a first storage area of the non-volatile memory reading of the ROM data is inhibited, and when "0" is written in a second storage area of the non-volatile memory reading of the ROM data is allowed. A data can be written anytime in the first storage area but data can not be deleted from the first storage, so that the read inhibit mode is always effected in the initial state. A data can be written in the second storage area only when specific setting is executed but can not be deleted from the second storage.

REFERENCES:
patent: 5768208 (1998-06-01), Bruwer et al.
patent: 5883831 (1999-03-01), Lopez et al.
patent: 5912848 (1999-06-01), Bothwell

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