Design of Equal Precision Frequency Meter Based on FPGA NiosII

An equal precision frequency meter designed with FPGA is introduced.It adopts Verilog Hardware Description Language to implement function module in frequency meter,and adds pulse width measurement on the base of traditional frequency measurement.SOPC designing technique and system designing plan based on NiosⅡ soft core CPU are used in the design.It also adopts NiosⅡ soft core CPU as data processing unit,uses LCD 1602 equipment to display frequency,periods and pulse in real-time.The whole system is in the realization of a FPGA chip.So it has a high-precision measurement,real-time and flexible change of scene.