The passive serial configuration of FPGA is controlled by CPLD.EPROM is selected to store the configuration program.It can improve encryption of the CNC system, and simplify the circuit.

• 该方法由CPLD控制配置过程，EPROM存储配置文件，实现了FPGA的被动串行配置，增强了数控系统的保密性、简化了系统电路。