这是用于ALTERA公司CPLD/FPGA芯片的并口下载器，里面的电阻、电容的参数都是对的，是成熟产品的并口下载器设计方案。-This is used ALTERA chip CPLD/FPGA parallel port download, parameters of resistance, capacitance inside is all right, is a mature product parallel download device design scheme

　　电源滤波器是由电容、电感和电阻组成的滤波电路。滤波器可以对电源线中特定频率的频点或该频点以外的频率进行有效滤除，得到一个特定频率的电源信号，或消除一个特定频率后的电源信号。(Power filter is composed of capacitance and inductance and resistance of filter circuit.Specific frequency of the filter to the power cord or the point that the