本文转载至：http://en.wikipedia.org/wiki/System_on_a_chip A typical SoC consists of:

• a microcontroller, microprocessor or digital signal processor (DSP) core – multiprocessor SoCs (MPSoC) have more than one processor core
• memory blocks including a selection of ROM, RAM, EEPROM and flash memory
• timing sources including oscillators and phase-locked loops
• peripherals including counter-timers, real-time timers and power-on resetgenerators
• external interfaces, including industry standards such as USB, FireWire,Ethernet, USART, SPI
• analog interfaces including ADCs and DACs
• voltage regulators and power management circuits

A bus – either proprietary or industry-standard such as the AMBA bus from ARM Holdings – connects these blocks. DMA controllers route data directly between external interfaces and memory, bypassing the processor core and thereby increasing the data throughput of the SoC.