Design of USB Interface Based on Nios II

An USB Interface based on the Nios II soft-core and the USB controller chip-CH372 was designed. The hardware design was provided in a detailed way and the communications flow was analysed. At the same time, the software was also given between the controller and the PC. Compared with the traditional project, This design has a strong expansibility and agility. It also reduces the cost that used to develop the software and the risk in the course of the hardware development.