An Analytical Model Describing the Relationships between
Logic Architecture and FPGA Density
Andrew Lam, Steven J.E. Wilton, Philip Leong, Wayne Luk
International Conference on Field-Programmable Logic and Applications (FPL 2008)
Abstract
This paper describes an analytical model, based principally
on Rent's Rule, that relates logic architectural parameters
to the area efficiency of an FPGA. In particular, the model
relates the lookup-table size, the cluster size, and the number
of inputs per cluster to the amount of logic that can be
packed into each lookup-table and cluster, and the number of
used inputs per cluster. Comparison to experimental results
show that our models are accurate. This accuracy combined
with the simple form of the equations make them a powerful
tool for FPGA architects to better understand and guide the
development of future FPGA architectures.
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