SDRAM Chips under the VxWorks Implementation of Self-check Function
Chen Lei1, Yang Zhen2, Liu Xi2, Chen Lei1
1.JiangSu XiDian NanZi Smart Electric Power Equipment Co. Ltd., Nanjing 211000; 2.Wenzhou Electric Power Supply Company of State Grid Zhejiang Electric Power Company., Wenzhou, Zhejiang 325000
Abstract：The microcomputer-based relaying protection devices of secondary equipment in power grid system, needs a stable and reliable operation. Except the lockout relay breaks down, the device should not result in operating erroneously or failing whenever any components inside the device get failure. In recent years, the relay protection device manufacturers are gradually using SDRAM for program and data memory, but the SDRAM chip does not have automatic detection and correction functions, and the large-capacity SDRAM is susceptible to electromagnetic interference. Wrong instruction will cause unpredictable result, and wrong data will also be a seriously threat to system security, so it is necessary to have method to monitoring SDRAM. Therefore, as a key component in the relay protection equipment, the self-checking of SDRAM chip during normal operation will be important and urgent. This paper presents a SDRAM chip self-checking method during the embedded system running, this method has been verified in application, and widely used in company equipments.
2013, Vol. 14 
