Signal Generator Based On Nios Ⅱ Soft-core Processor

Embedded system is one of the poppest concept,and also another hot spot in the development of today's electronical technology.The thesis follows on the heels of the trend of embedded system development, and employs a new technology of embedded system design—SOPC technology, which is applied to the research of a signal generator.SOPC is an inevitable result of programmable technique developing. Altera Corporation first refered to the concept of SOPC in 2000.Afterwards,it developed Nios soft-wore processor.The Nios II processor is the latest technology especially for the implement of SOPC. Nios II is a 32-bit RISC processor soft core, which is brought to the embedded system designers as the form of IP core.Nios II processor has the characteristic of reconfiguration, which has offered more flexibility and a brand-new thought to Embedded System designers and can accomplish the SOPC design based on FPGA.It realizes a reconfigurable embedded system by embedding the thirty-two bits processor and other application IP discreteness in FPGA.After the theoretical analysis of DDS, a DDS IP core is designed and a solution of designing signal generator based on SOPC is presented . An embedded system processor named NIOS II is the controlling core embedded into a Cyclone II EP2C35 FPGA.And the other programmable logical resources make up of the IP core of peripheral interface controlling circuit, which provide peripheral fast D/A converter controlling, SDRAM controlling, LCD display controlling, key controlling, and so on. The thesis analyzes the whole structure of signal generator and every circuit module. The interrelated software is designed.At the end of the thesis, the system design is realized and validated successfully by the result of testing.The feasibility of SOPC based on NIOS II processor is validated too. Try the new SOPC technology in development of software and hardware design.It shortens the design period, saves upgrade cost and optimizes the performance and resources.