浅谈PowerPc8245内部cache结构与映射方式  

Discussion briefly about the internal cache structure and mapping of PowerPc8245

作　　者：陈帅[1] 张斌峰[1] 王旭东[1] 

机构地区：[1]中航工业西安航空计算技术研究所,陕西西安710119

出　　处：《大众科技》2014年第6期37-38,共2页Popular Science & Technology

摘　　要：硬实时系统中,从输入到输出的滞后时间必须足够小到一个可以接受的时限内,且实时系统逻辑正确性不仅依赖于计算结果的正确性,还取决于输出结果的时间,PowerPC处理器在这方面的性能很是出色。近年来,PowerPC处理器以其多样化功能和优异性能在嵌入式系统中广泛应用,而PowerPc8245的cache支持锁定重要例程或指令序列到内部cache中,以满足对时间要求很高的应用。本文主要介绍MPC8245的内部cache的结构和与主存的映射以及替换算法。In Real-Time System, the deadline is very important. Embedded applications can lock interrupt routines or other important （time-sensitive） instruction sequences into the instruction cache, and data canbe locked into the data cache, which may be important to code that must have deterministic execution. Recently, PowerPC is wildly used for it’s good performance in embedded system. This article provides an overview of the MPC8245’s cache：the Cache Organization, relation to main memory.

关 键 词：CACHE LRU 写回法 写直达法 MMU 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]