Data writing and data reading methods of Flash

Abstract

The invention discloses data writing and data reading methods of Flash, and belongs to the field of storage. The data writing method comprises the following steps: examining whether the free spaces of a data area and an index area of a physical page are sufficient, if so, storing the current data writing sequence into the data area of the physical page, and generating an index log sequence to be written into the index area of the physical page; if not, organizing true data in the physical page, storing the truthful data in the data area of an idle page, and generating an index log to be written into the index area of the idle page according to the truthful data. The data reading method comprises the following steps: obtaining the true storage address of data to be read according to the index log in the index area of the physical page, and reading the data from the true storage address. The data writing and data reading methods have the beneficial effects that the data updating and reading efficiency can be improved, and the space utilization rate of the Flash also can be ensured.

Description

technical field [0001] The invention relates to the field of memory, in particular to a data writing and reading method for Flash. Background technique [0002] Flash is a kind of memory chip. Flash memory is also called flash memory. It combines the strengths of ROM (read-only memory) and RAM (random access memory). It not only has electronic erasable and programmable performance, but also can read data quickly. So that the data will not be lost due to power failure. [0003] The inventor finds in the process of realizing the present invention, based on the characteristics that Flash can only perform erasing operations in units of blocks or on the entire chip, there are at least the following deficiencies in the prior art: the pages of many Flash chips are very large, but the application The content that needs to be updated each time is relatively small. According to the current general method, even if a few bytes of data are updated each time, it is necessary to re-find t...

AI Technical Summary

Problems solved by technology

[0003] The inventor finds in the process of realizing the present invention, based on the characteristics that Flash can only perform erasing operations in units of blocks or on the entire chip, there are at least the following deficiencies in the prior art: the pages of many Flash chips are very large, but the application The content that needs to be updated each time is relatively small. According to the current general method, even if a few bytes of data are updated each time, it is necessary to re-find the free physical page, and then update the content of the original page in RAM and write it For new physical pages, using this method to update data is inefficient and will shorten the life of Flash;

[0004] A solution to the above problems is to divide the physical page into a valid data area and a log area. The valid data area is used to store data. When the data in the valid data area needs to be updated, an erase operation is not performed, but a The update log containing updated data is written to the log area; the disadvantage of this method is that it will reduce read efficiency and space utilization

Images