适于空间图像闪存阵列的非与闪存控制器

提出一种适于空间应用的非与(NAND,not and)闪存控制器。首先,分析了空间相机存储图像的要求,说明了闪存控制器结构的特点。接着,分析了闪存数据存储差错的机理,针对闪存结构组织特点提出了一种基于BCH(Bose-Chaudhuri-Hocquenghem,2108,2048,5)码的闪存纠错算法。然后,对传统BCH编码器进行了改进,提出了一种8bit并行蝶形阵列处理机制。最后,使用地面检测设备对闪存控制器进行了试验验证。结果表明,闪存控制器能快速稳定、可靠地工作,在闪存单页2Kbt/page下可以纠正40bit错误,在相机正常工作行频为2.5kHz下拍摄图像时4级流水线闪存连续写入速度达到133Mbit/s,可以满足空间相机图像存储系统的应用。

NAND flash memory controller for image flash array in space

This paper proposes an NAND flash memory controller for image flash array in space.First,a deep analysis of the need of image memory for space camera is presented.And the stucture characteristics of flash controller are presented.Then the principle of data error for flash data storage is analyzed in this paper.A flash correcting algorithm based on Bose-Chaudhuri-Hocquenghem(BCH)(2108,2048,5)code is put forward according to the structural characteristics of flash.Then an 8-bit parallel butterfly array processing mechanism is proposed based on the improved BCH encoder.Finally,the verification experiments for NAND controller in the prototype machine of XX-X space multi-spectral camera are carried out.The experimental results show that the proposed controller can operate fast,efficiently,reliably,and stably.The proposed error correction algorithm is able to correct 40 bit errors in 2 kbit/page.When the line frequency of space camera in a normal working condition is 2.5 kHz,the writing speed of four-stage pipeline flash can reach 133 Mbit/s.The controller can satisfy the space camera data storage requirements of reliability.