Circuit for modifying stored data

Details Circuit for modifying stored data Circuit for modifying stored data

2005-10-11

2005-10-11

Torres, Joseph (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S006130

Reexamination Certificate

active

06954889

ABSTRACT:
A stored data modifier modifies data starting at any arbitrary address on a storage medium that should output a data word with a multi-byte width. A masked ROM outputs a 2N-byte data word starting at an address specified as a multiple of 2Nby an address signal. A correspondence detector determines whether or not correspondence is found between a correction address and one of a number 2Nof addresses starting at, or preceding, the address specified by the address signal. If the correspondence detector has found the correspondence, a stored data selecting section selectively outputs, on a byte-by-byte basis, either the output of the masked ROM or correction data in accordance with the address signal and the correction address.

REFERENCES:
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patent: 5301281 (1994-04-01), Kennedy
patent: 5377338 (1994-12-01), Olson et al.
patent: 5574926 (1996-11-01), Miyazawa et al.
patent: 5938774 (1999-08-01), Hsu
patent: 64-057498 (1989-03-01), None
patent: 11-039213 (1999-02-01), None

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