面向媒体处理可重构系统中数据缓存结构和缓存管理策略优化

Data cache structure and management strategy optimization of reconfigurable system for multimedia applications

研究并提出了一种基于二维访问机制的数据缓存结构（2D Cache）及其更新管理策略．该缓存结构可以在控制硬件存储开销的同时，有效提升可重构系统的数据访存效率．实验结果表明，仅需4 KB的数据缓存开销，可重构系统的访存性能提升了29.16％～35.65％，并且对于不同标准的媒体处理算法都能获得较好的优化效果，具有很好的适应性．芯片实测结果表明，采用所述数据缓存设计方案的可重构系统可以在200 MHz下满足1080p＠30fps的实时解码需求，与国际同类架构相比，性能提高了1.8倍以上．

In order to improve the data flow of the reconfigurable system with a lower embedded data memory cost,a data cache optimization method is proposed,including the two-dimensional Cache structure and the related cache management strategy.The experimental results show that the approach is efficient for various multimedia applications,and the memory access performance of the reconfigu-rable system can be improved by 29.16% to 35.65% with a 4 KB data cache.The proposed data cache structure was adopted in a reconfigurable system and realized with real chip.Based on the the proposed data cache structures,the reconfigurable system can support the 1080p@30fps stream deco-ding at the clock frequency of 200 MHz.Moreover,the performance of the reconfigurable system is 1 .8 times higher than that of other reconfigurable architectures.