High speed and high capacity image recorder based on NAND flash
Wang Dong-he · Optics and Precision Engineering · 2009
In consideration of the low speed,small capacity and invalid block existing in a NAND flash,the reliability storage solutions of a high speed and high capacity image recorder based on NAND flash are proposed.After analyzing the structure and characteristics of NAND flash and separating written invalid block from non-written invalid blocks in the flash,the classified data matching and detection mechanism based on CAM are presented to raise the invalid block information matching speed,and a SRAM array backup is adopted to prevent data writing errors.Based on this,a dual pipelining mechanism based on a dual bus structure is proposed to prevent the interruption of writing pipelining when the invalid block is occurred in multiple pipelining grade during writing.An experiment based on a hardware platform is carried out,which indicates that the algorithm can identify the invalid blocks in 5 system clock periods and can offer the consistent storage speed of 960 Mb/s,consistent read speed of 1.152 Gb/s and the erasing speed up to 27.3 Gb/s.Moreover,the system storage capacity is up to 80 GB.