Using Cluster-Based Logic Blocks and Timing-Driven Packing to Improve FPGA Speed and Density.

Alexander Marquardt Vaughn Betz Jonathan Rose Using Cluster-Based Logic Blocks and Timing-Driven Packing to Improve FPGA Speed and Density. 37-46 1999 FPGA http://doi.acm.org/10.1145/296399.296426 db/conf/fpga/fpga99.html#MarquardtBR99