基于FPGA NiosⅡ的等精度频率计设计

Design of Equal Precision Frequency Meter Based on FPGA NiosⅡ

介绍了一种利用FPGA芯片设计的等精度频率计。对传统的等精度测量方法进行了改进,增加了测量脉冲宽度的功能,采用SOPC设计技术和基于NiosⅡ嵌入式软核处理器的系统设计方案,通过在FPGA芯片上配置NiosII软核处理器进行数据运算处理,利用液晶显示器对测量的频率、周期、占空比进行实时显示,可读性好。整个系统在一片FPGA芯片上实现,系统测量精度高,实时性好,具有灵活的现场可更改性。

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 NioslI 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.