Evaluation and Comparison of Implementation Alternatives for Look-up Tables for Plastic Cell Architecture

Jun'ichiro TAKEMOTO  Toshihiro GOTO  Yuichiro SHIBATA  Kiyoshi OGURI  

IEICE TRANSACTIONS on Information and Systems   Vol.E86-D   No.5   pp.850-858
Publication Date: 2003/05/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Reconfigurable Computing)
look-up table,  static memory,  reconfigurable device,  transmission gate,  

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In this paper, the efficient structure of an LUT (look-up table) for an asynchronous reconfigurable PCA (Plastic Cell Architecture) device is investigated. A total of 15 types of implementation alternatives for LUTs are evaluated and compared in an empirical manner in which full custom layout design is developed and simulated. The evaluation results show that by introducing transmission gates in memory cells in an LUT, read time can be improved by 14.3% at the cost of 13.6% area increase compared to a conventional speed oriented implementation. It is also shown that use of transmission gates reduces 6.4% of area and 19.2% of read time against a conventional area oriented LUT implementation.