Method and system for flash memory write-in under sector mode

Abstract

The embodiment of the invention discloses a method for flash memory write-in under a sector mode, comprising the following steps of: judging whether data exist in a temporary storage block after finding a logical block, a cache block and the temporary storage block of current operation, and if the data exist in the temporary storage block, reading the data and writing the data into the cache block; then, writing the data of the operation into the cache block until the remained data are not enough to be written full of the length of a page; and then, temporarily storing the data with the remained length on the temporary block to end the operation. The invention also provides a system for flash memory write-in under a sector mode according to the method for flash memory write-in. By using the method and device provided by the invention, frequent whole-block reading and writing can be avoided, and the reading and writing speeds of Flash are greatly increased.

Description

technical field [0001] The invention relates to the field of flash memory management, in particular to a sector-based flash memory management method and device. Background technique [0002] During the production and use of flash memory, due to various reasons, some bad chips will appear, but not all blocks or pages of these bad chips are damaged. In the block-based management method, as long as the bad bits in the block If the number exceeds the limit value, the block is discarded. This method leads to a relatively low utilization rate of the flash memory, and the continuous increase of the capacity of the flash memory block also causes great waste in the way of discarding the entire block. [0003] In the prior art, the management method of the flash memory is changed to take the page as the unit. First, the flash memory is scanned to determine good pages and bad pages, and a bad page table is formed, and then the bad page information in the bad page table is removed, and...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the sector management mode can also be used to manage the Flash, which can further expand the availability of the flash memory, but both the page management mode and the sector management mode will cause the write speed of the flash memory to be reduced. It is currently the minimum management mode for Flash operations, but because the quality of each block and sector is different, the quality of the sectors of multiple blocks is intricate, and the operation of the computer on Flash is based on its own file system. Therefore, the address it writes will be different each time, and the operation of Flash cannot program multiple times in a page, which will cause the operation of Flash this time to fall into a certain sector of a certain page. In the next operation, the remaining sectors cannot be operated, and it must jump to the page boundary, so there must be some sectors in the middle that have not written data, and the data will not be continuously stored in the flash memory, so it must be Read the discontinuous data from the previous block, and then write it continuously to another empty block to complete a whole block writing, and in this case, due to the addition of a whole block read and a whole block write, The speed of Flash writing is reduced, which affects the reading and writing speed of Flash.

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