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Method and apparatus for data backup and restoration in a portable data device
| Details |
Inventors: Rakers, Patrick L.; Collins, Timothy James; Russell, Daniel J.; DiRaimondo, Sam;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Alam; Hosain T.
Assistant Examiner: Alam; Shahid
Attorney, Agent or Firm: Hughes; Terri S.
A portable data device (300) having a memory (302) is provided. The memory (302) is segmented into a plurality of sectors (304-312). A backup memory buffer (312) and a plurality of applications (304-310) are programmed into the plurality of sectors, wherein the backup memory buffer (312) is jointly used by the plurality of applications (304-310). A valid state of data is stored in the backup memory buffer (312) prior to performing a transaction for a first application (304). The valid state of data is restored in the first application (304) upon power up of the portable data device (300) in an event the transaction is terminated prior to completion, wherein the step of restoring is independent of a next application in which a next transaction is performed. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the present invention provides a method and an apparatus for efficient memory usage for data backup and restoration in a portable data device and for recovering the correct state of the data if a transaction is improperly terminated.
The preferred embodiment insures that the correct state of the data is stored in a memory shared by all applications programmed on the portable data device in the event the transaction is improperly terminated, without seriously impacting the size of the memory.
For ease of explanation and understanding, the following description assumes that the portable data device is a smartcard, even though it can be any type of processing-controlled device (e.
g.
, a microprocessor, a microcomputer, a microcontroller, a dedicated logic element, etc.
) capable of executing the methodology and/or steps of the present invention as described in detail below.
The preferred embodiment of the present invention also utilizes a "data backup and restoration" scheme that operates internally to the smartcard.
The "data backup and restoration" scheme is defined as the ability to restore the correct state of data for a given memory location when a change to the data is incomplete, such as an incomplete transaction or tear.
In the preferred embodiment, the data stored at a given memory location is automatically restored to its correct state upon power up of the smartcard, thus eliminating the need for a backup memory buffer per application.
As such, the preferred embodiment of the present invention minimizes the memory overhead required for the "data backup and restoration" scheme, thus allowing for efficient memory storage.
The preferred embodiment further allows an application controller to place data in different memory block locations/data fields within a sector of memory.
In accordance with the preferred embodiment of the present embodiment, this operation can be deterministic, pseudo-random or random in nature
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