Technique for accessing memory in a data processing apparatus

Details Technique for accessing memory in a data processing apparatus Technique for accessing memory in a data processing apparatus

2007-02-27

2007-02-27

Padmanabhan, Mano (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S005000, C711S145000

Reexamination Certificate

active

10714520

ABSTRACT:
The present invention provides a data processing apparatus and method for accessing memory. The data processing apparatus has a secure domain and a non-secure domain, in the secure domain the data processing apparatus having access to secure data which is not accessible in the non-secure domain. The data processing apparatus comprises a device coupled via a device bus with the memory, the device being operable, when an item of data in the memory is required by the device, to issue onto the device bus a memory access request pertaining to either the secure domain or the non-secure domain. The memory is operable to store data required by the device, and contains secure memory for storing secure data and non-secure memory for storing non-secure data. In accordance with the invention, the memory access request as issued by the device includes a domain signal identifying whether the memory access request pertains to either the secure domain or the non-secure domain. The presence of this domain signal issued as part of the memory access request enables checking to be performed to ensure that secure data within the secure memory is not accessed by the device when the memory access request pertains to the non-secure domain.

REFERENCES:
patent: 4521852 (1985-06-01), Guttag
patent: 5491827 (1996-02-01), Holtey
patent: 5581722 (1996-12-01), Welland
patent: 5638537 (1997-06-01), Yamada et al.
patent: 6052763 (2000-04-01), Maruyama
patent: 6282657 (2001-08-01), Kaplan et al.
patent: 6292874 (2001-09-01), Barnett
patent: 2002/0007456 (2002-01-01), Peinado et al.
patent: 2003/0101322 (2003-05-01), Gardner
patent: 2004/0064351 (2004-04-01), Mikurak
patent: 0 481 735 (1992-04-01), None
patent: 0 574 032 (1993-12-01), None
patent: 2 176 918 (1987-01-01), None
patent: 97/36235 (1997-10-01), None
patent: 02/03208 (2002-01-01), None

Affiliated with

Also associated with

Rating

Technique for accessing memory in a data processing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Technique for accessing memory in a data processing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Technique for accessing memory in a data processing apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3853049