Method for implementing a programmable logic device having look-up table and product-term circuitry

摘要

A programmable monolithic integrated logic circuit that includes look up table circuits and programmable logic array-like circuits. The integrated circuit can include a first number of the look up tables and a second number of the programmable logic array-like circuits and where the first and second numbers are related by a ratio of between 0.25:1 and 6:1, between 1:1 and 5:1, or about 4:1. The programmable logic array-like circuits can each include at least 10,000 or 50,000 equivalent two-input NAND gates, and the look up tables and the programmable logic array-like circuits can each comprise static random access cells. A method of implementing a logic circuit includes reading a netlist that includes a plurality of subnets. The method also includes determining the suitability of ones the subnets to being implemented with look up tables and with programmable logic array-like circuits, and determining whether to implement each subnet with a lookup table or a programmable logic array-like circuit based on results of the step of determining. Based on the steps of determining, the method implements a first subset of the plurality of subnets with look up table circuits and a second subset of the plurality of subnets with programmable logic array-like circuits.