There are many different types of FPGAs on the market, and their infrastructure mainly consists of three parts: programmable logic unit, programmable IO unit, and internal connectors, etc. The programmable logic unit consists of a set of Look up Table (LUT) and uses SRAM or Flash to save boolean functions, and each LUT is connected to a multiplexer and a trigger register to support timing circuits, and multiple LUTs can be constructed to handle complex functions. Each LUT is connected to a multiplexer and trigger register to support timing circuits, and multiple LUTs can be constructed to handle complex functions.