This document discusses system designing and modeling using field programmable gate arrays (FPGAs). It provides an overview of FPGA architecture, including logic blocks, interconnects, switch boxes, and input/output pads. Programming FPGAs involves using a hardware description language (HDL) like VHDL or Verilog to define the design, which is then synthesized, placed, and routed to the FPGA. Common applications of FPGAs include digital signal processing, image processing, cryptography, and ASIC prototyping. The document provides examples of FPGA components and programming.