Diagnostic circuit

Details Diagnostic circuit Diagnostic circuit

1994-12-28

1996-07-30

Canney, Vincent P.

Excavating

395800, G06F 1100

Patent

active

055419364

ABSTRACT:
There is disclosed a diagnostic circuit which comprises, for each of a plurality of function blocks obtained by dividing a function circuit, an arithmetic circuit for accumulatively calculating bit data of all flipflops in each function clock at each operation clock, a register for storing the result of the calculation in the arithmetic circuit, and a circuit for outputting data of the register as the operation result read out from the function block. With this arrangement, it is possible to certainly diagnose a sequential change of flipflops caused by clocks. In addition, since the number of the reading-out and comparison of the operation results can be reduced in comparison with the prior art, the diagnosis time can be shortened, and the capacity of a correct value memory can be reduced.

REFERENCES:
patent: 5043990 (1991-08-01), Doi et al.
patent: 5361230 (1994-11-01), Ikeda et al.

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