A method and system for erasing and writing data based on a norflash chip

Abstract

The present application discloses a data erasing method based on a NorFlash chip. The data erasing method includes: when detecting data to be written that needs to be written to the target physical sub-sector, querying the first physical sub-sector of the target First erase and write situation, and calculate the second erase and write situation of all physical sub-sectors; Based on mathematical statistics, judge whether the target physical sub-sector meets the preset condition according to the first erase and write situation and the second erase and write situation; Write the data to be written into the target physical sub-sector; if not, set the physical sub-sector with the least number of erasing times among all physical sub-sectors as the best physical sub-sector, and write the data to be written into The best physical subsector. The method can realize balanced erasing and writing of each sector in the NorFlash chip, and prolong the service life of the NorFlash chip. The application also discloses a data erasing system based on a NorFlash chip, which has the above beneficial effects.

Description

technical field [0001] The invention relates to the field of data storage, in particular to a method and system for erasing and writing data based on a NorFlash chip. Background technique [0002] Because the NorFlash chip allows applications to run directly on-chip, has higher transmission efficiency and cost-effectiveness, and has the characteristics of not losing data when power is turned off, many embedded products use the NorFlash chip as a storage device for applications and important data. [0003] According to the principle of flash programming, only 1 can be written as 0, but 0 cannot be written as 1. Therefore, before flash programming, the data of the corresponding storage unit needs to be erased first. At present, the erasing method provided by the flash chip includes sector There are two types of erase (Sector Erase) and chip erase (Chip Erase). Therefore, before writing data to a flash storage unit, the sector where the storage unit is located must be erased fi...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the data erasing and writing of the NorFlash chip is performed by recording the sector erasing time stamp to realize the equalization of each sector, but this method is very easy to cause the sector The inaccuracy of the erasing and writing time stamps recorded in the internal memory makes the erasing and writing of a certain sector too frequent when the back-calibration span is relatively large, which violates the original intention of sector-balanced erasing. Each sector time stamp needs to be erased and written to each sector, which takes a long time. At this time, once the system is abnormally powered off, it is very easy to cause flash data loss.

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