FPGA (field programmable gate array) architecture contains configurable logic blocks (CLB) and programmable interconnects. CLB is used to implement most of the logic in FPGA. A hierarchy of programmable interconnects called programmable switch matrix (PSM) allows the logic blocks of FPGA to be interconnected as needed by the system designer. Logic blocks and interconnects can be programmed after the manufacturing process by the customer/designer so that FPGA can perform whatever logical function is needed. Wherever a vertical and a horizontal line intersect there is a switch matrix interconnect point. In this article FPGA based on quantum-dot cellular automata (QCA) technology is presented. The research is dedicated mostly to PSM.