Efficient Vector Compaction Methods for Power Estimation with Consecutive Sampling Techniques

Chih-Yang HSU
Chien-Nan Jimmy LIU
Jing-Yang JOU

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E87-A    No.11    pp.2973-2982
Publication Date: 2004/11/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: VLSI Design Technology and CAD
power estimation,  vector compaction,  grouping,  consecutive sampling,  random sampling,  

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For large circuits, vector compaction techniques could provide a faster solution for power estimation with reasonable accuracy. Because traditional sampling approach will incur useless transitions between every sampled pattern pairs after they are concatenated into a single sequence for simulation, we proposed a vector compaction method with grouping and single-sequence consecutive sampling technique to solve this problem. However, it is very possible that we cannot find a perfect consecutive sequence without any undesired transitions. In such cases, the compaction ratio of the sequence length may not be improved too much. In this paper, we propose an efficient approach to relax the limitation a little bit such that multiple consecutive sequences are allowed. We also propose an algorithm to reduce the number of sequences instead of setting the number as one to find better solutions for vector compaction problem. As demonstrated in the experimental results, the average compaction ratio and speedup can be significantly improved by using this new approach.

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