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On Multiplexed Signal Tracing for Post-Silicon Validation

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2 Author(s)
Xiao Liu ; Dept. of Comput. Sci. & Eng., Chinese Univ. of Hong Kong, Hong Kong, China ; Qiang Xu

Trace-based debug techniques have widely been utilized in the industry to eliminate design errors escaped from pre-silicon verification. Existing solutions typically trace the same set of signals throughout each debug run, which is not quite effective for catching design errors. In this paper, we propose a multiplexed signal tracing strategy that is able to significantly increase debuggability of the circuit. That is, we divide the tracing procedure in each debug run into a few periods and trace different sets of signals in each period. We present a trace signal grouping algorithm to maximize the probability of catching the propagated evidences from design errors, considering the trace interconnection fabric design constraints. Moreover, we propose a trace signal selection solution to enhance the error detection capability. Experimental results on benchmark circuits demonstrate the effectiveness of the proposed solution.

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:32 ,  Issue: 5 )