Read only memory with a data compression system

Details Read only memory with a data compression system Read only memory with a data compression system

1993-12-03

1996-06-25

Teska, Kevin J.

G06F 1300

Patent

active

055308260

ABSTRACT:
In a read only memory, compression data of original data are stored in a storage unit, a read address which is given from the outside in order to read original data is converted into a storage address of the compression data in the storage unit which corresponds to the original data, the compression data which is read out in accordance with the converted storage address is expanded to restore the original data, and the restored original data is read out to the outside. In order to make it difficult for an unauthorized person to use the ROM, dummy address conversion data are mixed with address conversion data.

REFERENCES:
patent: 4446516 (1984-05-01), Nishimura
patent: 4449233 (1984-05-01), Brantingham
patent: 4491934 (1985-01-01), Heinz
patent: 4583196 (1986-04-01), Koo
patent: 4864494 (1989-09-01), Kobus, Jr.
patent: 4992954 (1991-02-01), Takeda et al.
patent: 5097426 (1992-03-01), Kawamura et al.
patent: 5179711 (1993-01-01), Vreeland

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