一种基于Cache机制的嵌入式Flash控制器设计  

DESIGN OF AN EMBEDDED FLASH CONTROLLER BASED ON CACHE MECHANISM

作　　者：曹健[1,2] 李凌浩[1] 黄雅东[1] 吴中海[1] 张兴[1,2] Cao Jian;Li Linghao;Huang Yadong;Wu Zhonghai;Zhang Xing(School of Software and Microelectronics ,Peking University,Beijing 100871 , China;School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 , China)

机构地区：[1]北京大学软件与微电子学院,北京100871 [2]北京大学信息科学技术学院,北京100871

出　　处：《计算机应用与软件》2016年第8期238-241,共4页Computer Applications and Software

摘　　要：嵌入式Flash(e Flash)在SoC中的运用日益广泛,而Flash较慢的读取速度与处理器高频取指之间的矛盾愈发突出。针对该问题,在Flash控制器中引入Cache机制,并运用组相联映射、优化的"最近最少使用"LRU(Least Recently Used)替换算法、流水预填充结构对Cache进行多方面优化。与未加入Cache机制的Flash控制器相比,加入Cache机制的Flash控制器可使处理器取指时间节省38%。E m bedded Flash (eF lash) is w id e ly used in S oC , b u t the c o n tra d ictio n became more prom ine nt between the flash slow readingspeed and the processor h igh -fre que ncy fe tc h . To solve the p ro b le m , we in troduce the cache m echanism in the flash c o n tro lle r, and use setassociativem a p p in g , op tim ized L R U ( Least R ecen tly U s e d ) replacem ent a lgo rithm and p re -fe tch in g structure to optim ize the cache.Compared w ith the flash c o n tro lle r w ith o u t ca ch e , the flash c o n tro lle r w ith cache can enable the processor to take the tim e to save 3 8 % .

关 键 词：嵌入式FLASH CACHE 组相联映射 LRU 流水预填充 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]