系统的核心电路由FPGA完成，本设计选用了Altera公司的EPlKl00QC208-3芯片，用VHDL语言对它进行设计，实现8位数字频率测量-Core of the system completed the circuit from the FPGA, the design selected Altera' s EPlKl00QC208-3 chip design using VHDL language to it, to ac