说明：  课程设计要求设计并用FPGA实现一个数字频率计，具体设计要求如下： 测量频率范围： 10Hz～100KHz 精度： ΔF / F ≤ ±2 % 系统外部时钟： 1024Hz 测量波形： 方波 Vp-p ＝ 3～5 V 硬件设备：Altera Flex10K10 五位数码管 LED发光二极管 编程语言：Verilog HDL / VHDL
(curriculum design and FPGA design to achieve a digital frequency meter, the specific design requirements are as follows : measurement frequency range : 10Hz to 100KHz precision : F/F 2% external clock system : 1024Hz Waveform Measurement : square Vp-p = 3 ~ 5 V hardware : Altera Flex10K10 five digital LED light emitting diode programming languages : Verilog HDL/VHDL)