The Research On Function Analysis And Test Base On SOC Chip Of Servo Drive System

System On Chip (SOC) is Chip that integrates the whole System On a Chip. Complete SOC system generally contains the microprocessor module, memory module, communication interface module, ADC and DAC module, power supply module and so on.This topic is about a set of SOC chip which supports MIPS 32 instruction, this chip is mainly used for industry and data acquisition, it is the core chip of the Numerical Control Unit (NCU), which has realized signal acquisition, storage, conversion, I/O and position control of machine tools, and other functions.In order to get stable performance of SOC chip and improve the quality of chip. In the first, analysing deeply the internal function of SOC chip. In the second, testing the function of the chip. The article is testing a packaging product chip function, the main idea is based on the specific function of the chip, designingindependently a test circuit board, and testing its internal function with oscilloscope and logic analyzer.This paper analyse this SOC chip internal modules of system structure, performance and interface design in detail, including in CPU processor, Nand Flash controller, PWM controller, DDR2 controller, I2 C interface, the interrupt control register, SPI interface, RTC controller, Watchdog, GPIO register modules’structure diagram, sequence diagram, such as registers definition and pins’function. On this basis, according to this chip’s characteristics, designingthe peripheral test circuit in Altium Designer winter 10 and describingchips’ selection, including in the power supply circuit, SDRAM circuit, reset circuit, clock circiut, Flash memory circuit, LED circiut in test board. Then completing the schematic design and PCB design, making plate and welding circuit board. Finally, finishing test board’s software and hardware debugging, and with the help of the oscilloscope,observating module’s waveform of the test board.Firstly, I test SOC Chip’s Internal DAC module and 4 road PWM’s waveform, and then using software to test the function of SOC chip internal Flash’s reading and writing, copy of DDR2 memory, the speed of the mathematics and the USB access speed. Through analysis the result of the test, it shows that the chip’s internal five modules meet the requirement, the chip can product.