Method and computer-based system for rewriting a nonvolatile rew

Details Method and computer-based system for rewriting a nonvolatile rew Method and computer-based system for rewriting a nonvolatile rew

1998-01-30

2000-10-17

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711102, 380 4, G06F 1200

Patent

active

061346284

ABSTRACT:
A method and system have a feature of rewriting an application program to a nonvolatile rewritable memory in a way that allows for prevention of execution or corrupted program or recovery from failures that occur during execution of the application program. Before writing the application program to a first segment of the memory, an indicator is written to a second segment of the memory, indicating that the first segment of memory contains "invalid" information. At least the first segment, but not the second segment, is then erased and the application program is then written to the first segment. If the writing process is not completed, perhaps due to an unforseen disturbance (e.g., power outage) in the system, the first segment retains the indicator without changing the indicator's value. However, if the writing process is completed, a control processor determines that the writing process is completed and changes the indicator in the first segment to a value indicative of "valid" data. Prior to subsequent attempts to execute the application program, the value is checked, and if the value indicates the presence of invalid data, process control does not transition to the application program. A delay provision is also included for providing a window of opportunity to issue a command signal during a predetermined time interval that causes the process flow to not transition to the application program, even if the indicator indicates the application program contains valid data.

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patent: 5513333 (1996-04-01), Kynett et al.
patent: 5937063 (1999-08-01), Davis

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