Method and apparatus for preventing a data processing system fro

Details Method and apparatus for preventing a data processing system fro Method and apparatus for preventing a data processing system fro

1994-12-05

1996-08-13

Harrell, Robert B.

Boots, shoes, and leggings

364DIG1, 364DIG2, 364273, 3642731, 3642732, 3642733, 3642734, G06F 900

Patent

active

055465889

ABSTRACT:
A method and apparatus for preventing a data processing system (10) from entering a non-recoverable state. In one form, the present invention uses a pin (40) to indicate whether or not the execution of a non-recoverable instruction is legal. If the pin indicates that the execution of the instruction is legal, then the instruction is executed and the data processing system (10) is placed into a state that requires an external stimulus in order to recover. If the pin indicates that the execution of the instruction is illegal, then the instruction is not permitted to place the data processing system (10) into a state that requires an external stimulus in order to recover. Instead, an internal recovery mechanism is provided which returns the data processing system (10) to normal processing.

REFERENCES:
patent: 4573117 (1986-02-01), Boney
patent: 4669059 (1987-05-01), Little et al.
patent: 4748559 (1988-05-01), Smith et al.
patent: 4758945 (1988-07-01), Remedi

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