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Multiplexed trace signal selection using non-trivial implication-based correlation

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2 Author(s)
Prabhakar, S. ; Dept. of Electr. & Comput. Eng., Virginia Tech, Blacksburg, VA, USA ; Hsiao, M.S.

Silicon debug with a trace buffer provides real-time visibility to the design under debug. It traces a small subset of internal signals during its normal operation. The effectiveness of silicon debug, then, depends critically on the selection of trace signals. This paper proposes a new multiplexer-based trace signal interconnection scheme and a new heuristic for trace signal selection based on implication-based correlation. As a result, we can effectively trace twice as many signals with the same trace buffer width. We also propose a SAT-based heuristic to prune the selected trace signal list further to take into account those multi-node implications. Finally, we propose a state restoration algorithm for the multiplexer-based trace signal interconnection scheme. Experiments for sequential benchmark circuits showed that the proposed approach selects the trace signals effectively, giving superior restoration percentage compared with other techniques.

Published in:

Quality Electronic Design (ISQED), 2010 11th International Symposium on

Date of Conference:

22-24 March 2010

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