Abstract: A new hybrid FPGA architecture is proposed.The logic tile,which consists of a logic cluster and related connection boxes (CBs),can be configured as either programmable logic arrays (PLAs) or look-up tables (LUTs).This architecture can be classified as an AND-LUT array.PLAs are suitable for the implementation of high fan-in logic circuits,while LUTs are used to implement low fan-in logic circuits.As a result,the proposed hybrid FPGA architecture (HFA) is more flexible to improve logic density.Experiments based on MCNC benchmark circuits were performed in both the hybrid architecture and conventional LUT-based symmetrical FPGA architecture in term of area consumption.Preliminary results indicate that on average,the area is reduced by 46% using the new hybrid architecture.

Key words: hybrid FPGA, AND-LUT array, AND-OR array, PLA, LUT