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Efficient Cut Enumeration Heuristics for DepthOptimum Technology Mapping for LUTBased FPGAs
Taiga TAKATA Yusuke MATSUNAGA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E92A
No.12
pp.32683275 Publication Date: 2009/12/01
Online ISSN: 17451337
DOI: 10.1587/transfun.E92.A.3268
Print ISSN: 09168508 Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms) Category: Embedded, RealTime and Reconfigurable Systems Keyword: FPGA, technology mapping, cut enumeration,
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Summary:
Recent technology mappers for LUT based FPGAs employ cut enumeration. Although many cuts are often needed to find a good network, enumerating all the cuts with large size consumes a lot of runtime. Existing algorithms employ the bottomup merging which calculates Cartesian products of the fanins' cuts for each node. The number of cuts is much smaller than the size of the Cartesian products in most cases. Thus, the existing algorithms are inefficient. Furthermore, the number of cuts exponentially increases with the size of cuts, that makes the runtime much longer. Several algorithms to enumerate not all the cuts but partial cuts have been presented, but they tend to disturb the quality of networks. This paper presents two algorithms to enumerate cuts; an exhaustive enumeration and a partial enumeration. Both of them are efficient because they do not employ the bottomup merging. The partial enumeration reduces the number of enumerated cuts with a guarantee that a depthminimum network can be constructed. The experimental results show that the exhaustive enumeration runs about 5 and 13 times faster than the existing bottomup algorithm for K=8, 9 respectively, while keeping the same results. On the other hand, the partial enumeration runs about 9 and 29 times faster than the existing algorithm for K = 8, 9, respectively. The average area of networks derived by the sets of cuts enumerated by the partial enumeration is only 4% larger than that derived with using all the cuts, and the depth is the same.

