FPGA 实现一种基于ISA接口的3路编码器计数，与3路PWM/DDA输出编码器计数包含倍频、鉴相PWM实现12位分辨率 已通过测试。 -FPGA implementation based on the ISA interface, 3 channel encoder count, and 3-way PWM/the DDA output encoder count contains a multiplier, the phase PWM 12-bit resolution has been