馈线保护中双口RAM的DSP与ARM9双CPU系统接口电路设计

Design of Dual-Port RAM Interface in Double CPU Feeder Line Protection System

介绍了DSP和ARM9双CPU经双口RAM的接口电路设计。在馈线保护中,采用DSP+ARM9的双CPU结构,两者之间采用双口RAM进行数据交换。考虑到馈线保护的实时性和可靠性,对双口RAM选用了中断仲裁方式。设计了双口RAM、DSP和ARM9三者之间的硬件接口电路,同时还对三者地址值的分配关系进行了阐述。该接口的设计为牵引变电所馈线保护系统的需求打下了一定基础。

In this paper,the interface circuit of ARM and DSP is introduced.The multi-CPU structure with ARM and DSP is adopted in feeder line protection system.Dual-port RAM is used for data exchange between ARM and DSP.Considering that the feeder line protection system requires high reliability and real-time performance,the interrupt manner is adopted of dualport RAM.Design the interface circuits of ARM,DSP and dual-port RAM,and the address mapping for them.This interface grounded the realization of feeder line protection system.Then the system will be more applicable in electrified railway traction substation.