Input-aware implication selection scheme utilizing atpg for efficient concurrent error detection

Abstract

Recently, concurrent error detection enabled through invariant relationships between different wires in a circuit has been proposed. Because there are many such implications in a circuit, selection strategies have been developed to select the most valuable implications for inclusion in the checker hardware such that a sufficiently high probability of error detection (Pdetection) is achieved. These algorithms, however, due to their heuristic nature cannot guarantee a lossless Pdetection. In this paper, we develop a new input-aware implication selection algorithm with the help of ATPG which minimizes loss on Pdetection. In our algorithm, the detectability of errors for each candidate implication is carefully evaluated using error prone vectors. The evaluation results are then utilized to select the most efficient candidates for achieving optimal Pdetection. The experimental results on 15 representative combinatorial benchmark circuits from the MCNC benchmarks suite show that the implications selected from our algorithm achieve better Pdetection in comparison to the state of the art. The proposed method also offers better performance, up to 41.10%, in terms of the proposed impact-level metric, which is the ratio of achieved Pdetection to the implication count.