面向媒体的粗粒度可重构架构层次化存储设计

Hierarchical Memory Optimization Based on Coarse Grain Reconfigurable Architecture for Multimedia Application

为了优化粗粒度可重构架构REMUS-II(Reconfigurable Multimedia System 2)的数据流通路,使其能够完成高性能媒体解码,针对媒体算法的数据访问特征,对REMUS-II的片上存储与片外存储访问模块进行优化.片上存储通过二维数据传输和转置等访问模式进行优化,片上数据传输效率分别平均提高了69.6%和15.1%.片外存储通过块缓存设计优化参考帧访问,平均减少37%的外存访问时间.经过层次化存储设计,REMUS-II数据流可满足计算需求,在200MHz主频下实现H.264算法和MPEG2算法高级档次的1 920像素×1 080像素高清分辨率实时解码.

In order to optimize the data flow of coarse grain reconfigurable architecture REMUS-II（Recon- figurable Multimedia System2） for high performance media decoding, a novel memory sub architecture of on- and off-chip memory was proposed by analyzing the data access pattern for multimedia application. For on-chip memory, the 2D-data and transpose transfer technique was employed to improve the data transfer efficiency by 69.6% and 15.1% on average, respectively. For off-chip memory, the block buffer was implemented to reduce the reference frame accesses with a 37% reduction of accessing time on average. With the memory hierarchy optimization, REMUS-II can achieve real-time H. 264 high profile and MPEG2 high level decoding with a definition of 1 980 pixel× 1 080 pixel at 200 MHz clock frequency.