大容量缓存压缩装置的设计与实现

发布时间：2018-03-26 21:23

  本文选题：大容量缓存　切入点：数据压缩　出处：《中北大学》2013年硕士论文

【摘要】：在航天领域，压缩是解决海量数据给有限信道带宽带来压力的主要措施之一，遥感图像因其获取代价很高所以特别珍贵，也给压缩技术带来了巨大的挑战，如何能即提高压缩比，又能保证还原后的图像与原始图像差距不大是当前压缩技术的主要发展目标。目前，JPEG2000图像压缩标准很好的解决了现有的矛盾。为满足特殊领域对数据实时性的要求，大容量的缓存FIFO的设计也是一个热门的研究方向。 本文首先介绍了数据缓存压缩的发展现状与应用领域，针对任务要求，确定了以Altera公司的Cyclone II（飓风II）系列FPGA为逻辑控制芯片，以两片SDRAM为缓存介质构造乒乓操作来缓存上游下发的数据，以美国ADI公司的JPEG2000专用芯片ADV212实现对数据的压缩的总体设计方案。本文详细介绍了大容量缓存和数据压缩各功能单元的构成和操作原理，采用简化的SDRAM控制器状态机来减少编程的复杂度。本文对关键的ADV212固件文件数据采取调用QuartusⅡ中提供的双端口RAM IP核，加载mif固件文件的方式，大大简化了VHDL程序的设计难度。为了保证缓存芯片SDRAM运行的可靠性，本设计在PCB布板方面采取了对数据线等长布线的操作，重要控制信号线上串联33的电阻，，消除干扰。 论文最后对装置各模块的功能进行了测试，并分析了缓存芯片中所读取的数据，对压缩后的数据进行了还原，结果表明，本文设计的缓存压缩装置满足要求，而且具有很高的实用意义。
[Abstract]:In the aerospace field, compression is one of the main measures to solve the pressure of mass data on the limited channel bandwidth. Remote sensing image is extremely valuable because of its high cost, and it also brings great challenges to compression technology. How to increase the compression ratio, At present, JPEG2000 image compression standard has solved the existing contradiction well. In order to meet the requirement of real-time data in special field, JPEG2000 image compression standard can ensure that the difference between the original image and the restored image is not big. The design of large-capacity cache FIFO is also a hot research direction. In this paper, the development and application of data cache compression are introduced. According to the task requirements, Altera Cyclone II series FPGA is chosen as the logic control chip. The ping-pong operation is constructed with two pieces of SDRAM as the buffer medium to cache the data sent down upstream, This paper introduces the structure and operation principle of each function unit of large capacity cache and data compression in detail. The state machine of simplified SDRAM controller is used to reduce the complexity of programming. In this paper, the key data of ADV212 firmware file is loaded by calling the dual-port RAM IP core provided in Quartus 鈪

本文编号：1669663