The Research And Design Of RISC Microprocessor Soft Core

With the rapid development of integrated circuit technology, the system of SOC was grown up, so the system would be developed toward the direction of more miniaturization, more intelligent and more efficient. This would raise the demands of the simplification of the structure, high efficiency and speed on the microprocessor. So the RISC microprocessor has become the hot research subject. On the other hand, the development of FPGA/SOPC technology makes the design of microprocessor quicker and more flexible. To begin with, the microstructure of RISC microprocessor was researched, then a16-bit RISC microprocessor was designed by employing top-down method on FPGA platform.(1) The architecture and logic model of microprocessor was researched, the top-down design and the development flow of FPGA were introduced, and the functional verification methods were presented.(2) The top level framework and operating space of the microprocessor were designed, and a set of instruction was analyzed and designed. In terms of the instruction set, each instruction details including instruction name, the assembly language form, operation, execution description were expounded, and the design flow of the microprocessor interrupt trigger and response were finished.(3) The overall block diagram of the microstructure of microprocessor was designed. The system-level design of the microprocessor was completed by using top-down method and internal operator control unit of the microprocessor was realized in Verilog HDL. The data and control path were analyzed by taking the designed instructions for example.(4) The simulation was done by ModelSim to realize the RTL function verification of the microprocessor. By employing the FPGA of Altera Company, the microprocessor testing platform was set up, and a board-level test on the hardware test system was finished. The hardware tested results are in good agreement with the simulation ones, which justifies the correctness of the excogitation for the16-bit RISC structure microprocessor.