提出了在视频显示应用中的新型存储器系统架构.为保证流畅的视频图像放映,片下存储器的访存成为影响系统性能的关键因素.首先具体分析图像中所划分块的运动矢量以减少访存行为,从而减少60%的周期数.第二,有效地访存方法为视频数据的传输提供了充足的带宽.为保证不同类型的信号之间没有干扰,安排了专用的存储器系统结构.相应地,一个专用于参考帧存取的本地 AMBA 实现了高速存取,双存储器控制器也使总线更加有效.根据以上方法,实验结果显示在60 兆赫兹下,系统可以完成每秒 30 帧的实时高清(720p)解码.%This paper proposes novel memory system architecture for video display. To display video stream smooth, off-chip memory access is crucial factor in motion compensation and display feeder. First of all,the paper presents new memory access scheme based on motion vector analysis. More than 60% reduced cycle number is reported. Secondly, efficient memory access style for display feeder contributes sufficient bandwidth for data transfer, and special memory system keeps data undisturbed with each other. Accord-ingly, a special local AMBA only used for reference frame makes memory access at high speed and dual memory controllers make bus efficient. Experiment results show that the design supports 30 f/s real-time digital-HDTV 720p clocking at 60 MHz.
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