Software error detection apparatus

Details Software error detection apparatus Software error detection apparatus

1989-04-03

1990-05-15

Smith, Jerry

Excavating

371 62, 371 19, G06F 1100

Patent

active

049264273

ABSTRACT:
A software error detection circuit is described which supplements the known concept of a simple watch dog timer. The same clock pulse used to clock and time out a watch dog timer implements the addressing of a program memory. A comparison is then made of output data with data on a data bus. A failed comparison then raises an alarm faster and more efficiently than a timer circuit alone. Furthermore, in a parallel data bus environment a predetermined data check of adjacent bus line data is recommended over an all data or a random data check.

REFERENCES:
patent: 4649537 (1987-03-01), Rosswurm
patent: 4683568 (1987-07-01), Urban
patent: 4696002 (1987-09-01), Schleupen
M. L. Carnes, "Processor Checking", IBM TDB, vol. 17, No. 11, Apr. 1975, pp. 3188-3189.

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