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针对目前大部分串行接口传输效率低的缺陷,设计采用USB接口实现了NIOS系统与PC机的通信。介绍了NIOS系统和USB接口芯片CY7C68013的基本工作原理;设计了USB控制器的IP核、固件程序和应用程序;利用从属fifo方式,实现了数据的快速读写。测试结果表明,利用NIOS系统控制USB器件CY7C68013可实现高速数据传输、传输数据准确性高。
Aiming at the defects of low transmission efficiency of most serial interfaces at present, the design uses USB interface to realize the communication between NIOS system and PC. Introduced the NIOS system and the USB interface chip CY7C68013 basic working principle; designed the USB controller IP core, firmware programs and applications; using subordinate fifo way to achieve the rapid data read and write. Test results show that the use of NIOS system control USB device CY7C68013 can achieve high-speed data transmission, transmission data accuracy.