SDRAM在大视场TDICCD空间相机中的应用
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摘要
该文针对大视场空间相机中需要缓存的图像数据量大的问题,对高速大容量存储器SDRAM控制技术进行了研究。首先,说明了大视场空间相机中图像数据缓存的需要,根据CCD图像数据和图像缓存工作特点,提出了基于行使能和刷新操作驱动和基于仲裁策略的SDRAM控制器。然后,为了提高图像数据缓存可靠性,针对缓存小数据量场合,提出了(6,8)纠错算法,针对缓存大数据场合提出了RS(143,127)和RS(142,126)码纠错算法。最后,在XX-X空间多光谱相机样机的成像系统上进行了试验验证。实验结果表明:两种控制器工作频率能够达到131 MHz,正常工作时,行使能驱动控制器存取速度达到127.08 MBps,仲裁策略控制器存取速度达到139.788 MBps,两种纠错算法在507 B/row内可以纠正32 b错误。基本满足空间相机中的稳定可靠、高效率的缓存图像数据要求。
In order to resolve the problem of images buffering with huge amount of data quantum in large field TDICCD space camera,the control technology of SDRAM which is a high-speed and large capacity data memory is studied.First,the paper explains the image buffering demand in large field TDICCD space camera,and a SDRAM controller using line enabling driving and a SDRAM controller using arbitration policy are proposed based on the characteristics of CCD image data and that of image buffer.Then,In order to improve reliability for data buffering,a(6,8) error correction algorithm is proposed for the small data situation,and a error correction algorithm of RS(143,127) and RS(142,126) code are proposed for the large data situation.Finally,the verification experiments to CCD imaging system in the prototype machine of XX-X space multi-spectral camera are carried out.The experiments results show that the working frequenc of the two proposed controllers is able to reached 131 MHz.When the system works steadily,the data access speed of line driving controller is 127.08 MBps,and that of arbitration controller is 139.788 MBps.The two proposed error correction algorithms are able to correct 32 b errors in 507 B/row.It can satisfy the space camera data buffering requirements of non-contact,real time and rapid speed.
In order to resolve the problem of images buffering with huge amount of data quantum in large field TDICCD space camera,the control technology of SDRAM which is a high-speed and large capacity data memory is studied.First,the paper explains the image buffering demand in large field TDICCD space camera,and a SDRAM controller using line enabling driving and a SDRAM controller using arbitration policy are proposed based on the characteristics of CCD image data and that of image buffer.Then,In order to improve reliability for data buffering,a(6,8) error correction algorithm is proposed for the small data situation,and a error correction algorithm of RS(143,127) and RS(142,126) code are proposed for the large data situation.Finally,the verification experiments to CCD imaging system in the prototype machine of XX-X space multi-spectral camera are carried out.The experiments results show that the working frequenc of the two proposed controllers is able to reached 131 MHz.When the system works steadily,the data access speed of line driving controller is 127.08 MBps,and that of arbitration controller is 139.788 MBps.The two proposed error correction algorithms are able to correct 32 b errors in 507 B/row.It can satisfy the space camera data buffering requirements of non-contact,real time and rapid speed.
引文
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[2]赵强,罗嵘,王蕙,等.用于HDTV视频解码器的高性能SDRAM控制器[J].电子与信息学报,2007,29(6):1332-1337.Zhao Qiang,Luo Rong,Wang Hui,et al..High performanceSDRAM controller design for HDTV video decoder[J].Journal of Electronics&Information Technology,2007,29(6):1332-1337.
[3]Xiao Y,Luo C,and Yang C.The comparative analysis ofLDPC and RS code[C].IEEE Conference on ConsumerElectronics,Communications and Networks(CECNET),Xianning,China,April 2011:4510-4513.
[4]于湘珍,刘军,王秋娟.RS码在汉信码中的纠错性能分析及仿真[J].南京理工大学学报(自然科学版),2011,35(1):42-46.Yu Xiang-zhen,Liu Jun,and Wang Qiu-juan.Analysis andsimulation on error correcting performance of RS code inchinese sensible code[J].Journal of Nanjing University ofScience and Technology(Natural Science),2011,35(1):42-46.
[5]Lee H.High speed VLSI architecture for Reed Solomondecoder[J].IEEE Transactions on Very Large ScaleIntegration(VLSI)System,2003,11(2):288-294.
[6]Berlekamp E R.Algebraic Coding Theory[M].New York:McGraw Hill,1968:118-125.
[7]Baek J H and Sunwoo M H.New degree computation-lessmodified Euclid algorithm and architecture for ReedSolomon decoder[J].IEEE Transactions on Very Large ScaleIntegration(VLSI)System,2006,14(8):915-920.
[8]刘悦,刘明业,尚振宏.RS(255,223)码的编译码软件实现[J].计算机应用与软件,2006,23(11):47-49.Liu Yue,Liu Ming-ye,and Shang Zhen-hong.A softwareimplementation of encoding and decoding for RS(255,223)[J].Computer Applications and Software,2006,23(11):47-49.
[9]马灵,杨俊峰,宋克柱,等.地震数据采集中基于FPGA的多DDR SDRAM控制器设计[J].中国科学技术大学学报,2010,40(9):939-945.Ma Ling,Yang Jun-feng,Song Ke-zhu,et al..A design ofmultiple DDR SDRAM controllers based on FPGA in aseismic data acquisition system[J].Journal of University ofScience and Technology of China,2010,40(9):939-945.
[10]司孝平.基于SDRAM的FPGA实时图像采集系统的设计[J].西南大学学报,2011,33(1):128-132.Si Xiao-ping.Design of an SDRAM-based FPGA real-timeimage acquisition system[J].Journal of Southwest University(Natural Science Edition),2011,33(1):128-132.
[11]刘正,黄战华,刘书桂.基于SDRAM的高分辨力高速图像缓存[J].光学仪器,2006,28(6):49-53.Liu Zheng,Huang Zhan-hua,and Liu Shu-gui.High-resolution high-speed image buffering using SDRAM[J].Optical Instruments,2006,28(6):49-53.
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