适用动态存储的自适应刷新机制算法设计

摘要

This paper is based on the requirement of the high reliability and low power consumption for data transmission and storage in aerospace applications. We put forward an adaptive refresh mechanism that a way to combine two kinds of refresh(auto refresh and self-refresh)based on the characteristics of SDRAM.A model is built for the adaptive refresh mechanism to analyze its feasibility and summarizes the calculation method of configuration parameters. The Monte Carlo method is used for simulating and analyzing the effect of the system power consumption. The adaptive refresh mechanism has been implemented on hardware platform and proved that it meets the requirements of high efficiency,reliable transmission and low power consumption of SDRAM controller in aerospace applications.%为满足航天应用中数据传输与存储中高可靠以及低功耗的要求,实现了一种自适应刷新机制的同步动态随机存储(Synchronous Dynamic Random Access MemorySDRAM)控制器.该机制利用SDRAM的自动刷新和自刷新的特点,提出了一种协调两类工作模式自适应执行的方法.对自适应刷新方法进行数学建模,分析了自适应刷新机制的可行性,从而归纳出配置参数的计算方法.建立仿真模型,利用蒙特卡洛方法对自适应刷新机制进行仿真,并讨论对系统功耗的影响.在实际硬件平台实现了自适应刷新机制的SDRAM控制器,满足航天应用中SDRAM控制器高效、可靠传输与低功耗兼顾的要求.