Nonvolatile memory erase control method capable of prolonging service life

Abstract

The invention discloses a software and hardware combined nonvolatile memory erasure control method capable of prolonging the service life. The method comprises the steps that first, a software is configured with and uses the multi-pulse erasure and enables the enhanced reading; then, the system initiates a request for erasing a nonvolatile memory, the hardware suspends the CPU clock, and the execution of other instructions is prevented; and after the erasing process is completed, the hardware reads the data of the erasing block by using a more strict standard, judges whether the erasing is successful, and informs the software of an erasing result flag bit; if the erase is successful, the CPU clock is turned on, and the subsequent instruction operation is executed continuously; if the erasefails, the software initiates a second erase instruction operation until the correct data is read; if the continuous N times of multi-pulse erase fails, the (N + 1)-th software enables the normal reading, and the data of the erase block is read; if the continuous N times of multi-pulse erase is successful, it is considered that the erase succeeds, otherwise, the erase process fails, wherein N canbe preset. According to the present invention, the service life of the nonvolatile memory can be effectively prolonged.

Description

technical field [0001] The invention relates to the field of non-volatile memory, relates to a non-volatile memory erasing control method based on an SOC system, in particular to a non-volatile memory erasing control circuit. . Background technique [0002] For smart card chips, non-volatile memory such as flash memory is essential. The performance of non-volatile memory will decrease with the increase of erasing times, and the degree of performance deterioration will be reflected in the time and current required for erasing, that is, the memory cells will go through such a process. First of all, it can be written with normal current and time; then, it needs to be written with a large current and a long time; finally, the writing is unsuccessful. [0003] Flash has a limit on the maximum number of erasing times. When the maximum number of times of erasing is exceeded, the corresponding flash storage unit will not work normally. At this time, if the chip continues to use t...

AI Technical Summary

Problems solved by technology

[0003] Flash has a limit on the maximum number of erasing times. When the maximum number of erasing times is exceeded, the corresponding flash storage unit will not work normally.

At this time, if the chip continues to use the flash storage unit, the entire chip will not work properly

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