Method and system for checking rotate, shift and sign...

Details Method and system for checking rotate, shift and sign... Method and system for checking rotate, shift and sign...

2008-05-20

2008-05-20

Lamarre, Guy (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error/fault detection technique

C712S026000

Reexamination Certificate

active

07376890

ABSTRACT:
A method of discovering a fault in a circuit is disclosed. The method comprises generating a first result of a selected function by performing the selected function on an operand, wherein the selected function employs a mask. Once the function is performed, an antimask of the mask is created, and the modulo of the antimask is calculated. A modulo function of the first result of the selected function is calculated to obtain a third result. A modulo of the operand is then calculated to obtain a fourth result, and a second function is then performed on the second result and the third result to obtain a fifth result. In response to comparing the fifth result to the fourth result, a signal is propagated to indicate a fault in the circuit.

REFERENCES:
patent: 2837278 (1958-06-01), Schreiner et al.
patent: 2919854 (1960-01-01), Singman
patent: 3137788 (1964-06-01), Froggatt
patent: 5742533 (1998-04-01), Moncsko
patent: 2004/0044525 (2004-03-01), Vinton et al.

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