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提出了一种混合FPGA新结构——新颖的AND-LUT阵列结构.其创新之处在于由可编程逻辑簇(Cluster)和相关的连接盒(CB)组成的可编程逻辑单元片(Tile)可以根据应用需要灵活地配置成PLA或LUT,前者较适合于高扇入逻辑,后者较适合于低扇入逻辑.因此,结合两者优点的新颖AND-LUT阵列结构在实现各种输入的用户逻辑时都能保持很好的逻辑利用率.MCNC电路测试结果进一步表明,同一逻辑电路在文中提出的混合FPGA新结构中实现与在基于LUT的对称FPGA结构中实现相比,面积平均可节省46%,因而大大提高了FPGA器件的逻辑利用率.
A new hybrid FPGA structure is proposed, which is a novel AND-LUT array structure. The innovation lies in that programmable logic cells (Tile) composed of programmable logic clusters (CBs) and associated CBs According to the application needs to be flexible to configure PLA or LUT, the former is more suitable for high-fan-in logic, which is more suitable for low-fan-in logic.Therefore, the combination of the advantages of both new AND-LUT array structure in achieving a variety of input users Logic can maintain a good logic utilization.MCNC circuit test results further show that the same logic circuit proposed in the new hybrid FPGA architecture to achieve compared with the LUT-based symmetrical FPGA structure, the average area savings 46 %, Thus greatly improving the logic utilization of FPGA devices.