Research on Fixed-Point Simulation Approaches in the Design of FPGAs

Fixed-point simulation is extremely important in the design of fixed-point FPGAs. Float-point simulation is used to verify the arithmetic, while the fixed-point simulation is adopted to evaluate performance and verify the implementation. The design of high-precision system by FPGAs must focus on the fixed-point simulation to reduce the error acceptable even to zero. Based on the analysis of fixed-point simulation approaches, the paper comes up with an approach of establishing a fixed-point model with MATLAB Fixed-Point Toolbox. Finally, it simulates a fixed-point LOG2 module from feature coefficient exactness and analyse the error with the FPGA program.