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Addition is ubiquitous in computer systems, and rising error rates make error detection within adders increasingly important. This paper considers the best way to introduce strong, non-intrusive error detection to fixed-point addition within an existing, optimized machine datapath. A flexible family of separable error detection techniques called carry-propagate/carry-free (CP/CF) duplication is presented...
As system sizes grow and devices become more sensitive to faults, adder protection may be necessary to achieve system error-rate bounds. This study investigates a novel fault detection scheme for fast adders, long residue checking (LRC), which has substantive advantages over all previous separable approaches. Long residues are found to provide a ~10% reduction in complexity and ~25% reduction in power...
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