Method to prevent data loss in an electrically erasable read onl

Details Method to prevent data loss in an electrically erasable read onl Method to prevent data loss in an electrically erasable read onl

1995-06-07

1997-01-21

Beausoliel, Jr., Robert W.

395430, 395479, 395490, G06F 1100

Patent

active

055967132

ABSTRACT:
An apparatus and method for tracking and interception of instructions as they are presented to the memory, selectively passing harmless data to the device and disallowing the sequences which instruct the device to perform harmful functions, such as self-erase. A software trap is provided to be transparent to the operation of the device and the host system, imposing no harmful timing delays or software overhead. Accordingly, the invention allows the use of standard electrically erasable read-only memories in an application which requires that the device be protected from global erasure. A hardware front end intercepts the software command which is used to globally erase the device. The apparatus receives address signals from the computer system corresponding to the protected peripheral device, receives data signals from the computer system to the protected peripheral device, tracks a predetermined sequence of address and address signals, substitutes at least one of the data signals received with a replacement data signal, and sends a replacement data signal.

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