Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-05-01
2007-05-01
Kim, Hong (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S152000, C710S200000
Reexamination Certificate
active
09805199
ABSTRACT:
A 1-chip microcomputer of the present invention has (a) a monitor flag for setting a flag indicating that a specified address space is accessed, (b) an access permission address range setting register, for setting an address range in which an access is permitted while the flag is set, (c) an access permission area detection circuit for judging whether the access is made within the address range thus set, (d) an access permission setting register, for setting whether or not an access with respect to an address other than the address range should be permitted, and (e) memory read-out control circuit and memory writing control circuit for controlling an access with respect to a nonvolatile memory based on a result thus judged and content set by the access permission setting register. With the arrangement, it is possible to provide a 1-chip microcomputer that maintains the security among application programs.
REFERENCES:
patent: 3803559 (1974-04-01), Bandoo et al.
patent: 5452431 (1995-09-01), Bournas
patent: 5890189 (1999-03-01), Nozue et al.
patent: 5956520 (1999-09-01), Kishi et al.
patent: 5991858 (1999-11-01), Weinlander
patent: 6594746 (2003-07-01), Rabeler
patent: 0735488 (1996-10-01), None
patent: 1134959 (2001-09-01), None
patent: 1-96747 (1989-04-01), None
patent: 1-180656 (1989-07-01), None
patent: A855204 (1996-02-01), None
patent: 10-240623 (1998-09-01), None
Free Online Dictionary of Computing, http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?query=flag, May 2, 1998.
Webster's 1913 Dictionary at hyperdictionary, http://www.hyperdictionary.com/search.aspx?define=judgment, 1913.
Takahashi et al., “Efficient Kernel Support of Fine-Grained Protection Domains for Mobile Code,” Distributed Computing Systems, 1999 Proceedings 19th IEEE Internatiional Conference, Austin, TX, USA May 31-Jun. 4, 1999, Los Alamitos, CA, USA, IEEE Comput. Soc. US, May 31, 1999, pp. 64-73.
Gareau, J., “Advanced Embedded x86 Programming: Protection and Segmentation,” Embedded Systems programmin, Miller Freeman, USA, vol. 11, No. 5, May 1998, pp. 72-74, 76, 78, 80, 82, 84, 86.
Kurioka Susumu
Ogawa Ryuichi
Ohno Kenji
Sutou Hiroki
Takeda Tadao
Birch & Stewart Kolasch & Birch, LLP
Kim Hong
Nippon Telegraph and Telephone Corporation
LandOfFree
1-chip microcomputer having controlled access to a memory... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with 1-chip microcomputer having controlled access to a memory..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 1-chip microcomputer having controlled access to a memory... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3755582