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Analysis of a BICS-only concurrent error detection method

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1 Author(s)
Jien-Chung Lo ; Dept. of Electr. & Comput. Eng., Rhode Island Univ., Kingston, RI, USA

We propose a BICS-only method for concurrent error detection (CED) where a built-in current sensor (BICS) is solely responsible for detecting faults and errors. Due to the wide applicability of the BICS, this approach can be applied directly to combinational circuits, sequential circuits, and even some analog circuits. A dependability model was developed to study the effectiveness of the proposed BICS-only method. The unsafe probability of the BICS-only design is sensitive to both fault coverage and testability of the BICS. When used in a duplicated CED system for fault masking, the system reliability is sensitive to the fault coverage, but not to the testability of the BICS. Next, we show that a dramatic increase in unsafe probability is possible if the BICS cannot perform detection at every system clock cycle. A higher testability for BICS will, contrary to our intuition, make the unsafe probability higher. For duplicated CED applications, the reliability will be even lower than that of a nonredundant system. Therefore, the design criteria for BICS in the BICS-only method, in the order of importance, are: operating speed, fault coverage, and testability

Published in:

Computers, IEEE Transactions on  (Volume:51 ,  Issue: 3 )

Date of Publication:

Mar 2002

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