Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Patent
1997-04-07
1999-07-27
Cabeca, John W.
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
711103, G06F 1214
Patent
active
059308265
ABSTRACT:
Flash memory circuits provide sector protection or file protection with protection attribute status bits held in a flash memory array. The sector protection protects memory data based on the physical location of the data. The flash memory array is divided into a number of memory sectors. Each memory sector can be protected independently. The size of the memory sector is flexible and may be as large as the whole memory array or as small as a single bit group. Each memory sector has protection bits stored in a protection bit array for indicating the protection state of the sector. A parallel protection structure providing both sector protection and block protection is also included. The parallel protection allows small size data protection as well as large size block protection. File protection protects memory data on a file basis regardless of the physical location of the data. Each file has protection bits stored in an attribute memory for indicating the protection state of the file. The attribute memory is made from part of the flash memory which simplifies the process of manufacturing the memory. It also reduces the area size of the attribute memory and the complexity of the control circuits.
REFERENCES:
patent: 4775958 (1988-10-01), Hashimoto
patent: 4821240 (1989-04-01), Nakamura et al.
patent: 5053990 (1991-10-01), Kreifels et al.
patent: 5337281 (1994-08-01), Kobayashi et al.
patent: 5369754 (1994-11-01), Fandrich et al.
patent: 5530827 (1996-06-01), Matsui et al.
patent: 5619461 (1997-04-01), Roohparvar
patent: 5644533 (1997-07-01), Lancaster et al.
patent: 5646890 (1997-07-01), Lee et al.
patent: 5687121 (1997-11-01), Lee et al.
patent: 5748538 (1998-05-01), Lee et al.
Hsu Fu-Chang
Lee Peter Wung
Tsao Hsing-Ya
Aplus Integrated Circuits, Inc.
Cabeca John W.
Lee Felix B.
LandOfFree
Flash memory protection attribute status bits held in a flash me does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flash memory protection attribute status bits held in a flash me, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flash memory protection attribute status bits held in a flash me will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-893324