Library of logical functions is an essential attribute of any digital device design system. The more diverse its composition (and, of course, the composition of the library of digital cells that implement these functions), the more optimal the structure of the device developed on its basis will be. This paper discusses the creation of libraries of logical functions in the FPGA (array of programmable logical cells). The features of creating such a system and the characteristics of the library obtained for a specific FPGA are presented.