SOC（System On a Chip）称为片上系统，它是指将一个完整产品的功能集成在一个芯片上或芯片组上。SOC中可以包括微处理器CPU、数字信号处理器DSP、存储器（ROM、RAM、Flash等）、总线和总线控制器、外围设备接口等，还可以包括数模混合电路（放大器、比较器、A/D和D/A转换器、锁相环等），甚至延拓到传感器、微机电和微光电单元。 -SOC (System On a Chip) is called on-chip system, which refers to a complete product functionality in a single chip or chipset. SOC can be included in the microprocessor CPU, digital signal processor DSP, memory (ROM, RAM, Flash, etc.), bus and bus controller, the external device interface, etc., may also include mixed analog-digital circuits (amplifiers, comparators, A/D and D/A converters, phase-locked loop, etc.), and even extension to the sensor, MEMS and micro-optical elements.