本文针对数控系统的工作特点和要求,通过对TI公司DSP芯片TMS320LF2407A和Cypress公司PCI接口芯片CY7C09449PV-AC的功能和特点进行深入分析,设计了一种基于PCI局部总线的步进电机运动控制卡。该卡能够较好地满足数控系统对运动控制部件的实时性和控制精度的苛刻要求。-In this paper, numerical control system characteristics and requirements, through the DSP of TI company TMS320LF2407A and Cypress chip PCI interface chip companies CY7C09449PV-AC' s functions and features in-depth analysis, design of a PCI local bus based on the stepper motor motion control card. The card can be used to meet the numerical control system for real-time motion control components and control the demanding requirements of precision.