The SOPC-technology Based Design and Implementation of an IP Controller Core of the Low-Resolution Multi-Object Spectrograph for the LAMOST

This paper discusses the design of an IP controller core of the Low-Resolution Spectrograph for the LAMOST using the SOPC technology,and the subsequent implementation of the electronic system controlled by such a core based on an NIOSⅡ "SOFT" CPU. The electronics for the spectrograph consist of two groups of components: the motor-control electronics and communication system. A remote control computer can send commands to an FPGA chip that can conveniently and correctly control 9 stepping motors in the spectrograph via an industrial ethernet. We can also control the FPGA from a local computer. The paper mainly focuses on how to encapsulate the controller of stepping motors and embed it into an IP controller in SOPC Builder and then reuse it in other parts of the design. The method reduces the design time appreciably and also avoids certain mistakes in design. The communication channels on RS232 and via the industrial etherent can be redundancy to each other, which makes the transmission of data and commands reliably.