Write protection method and controller for spi FLASH

Abstract

A write protection method for SPI FLASH and a controller. The method comprises: a controller acquires an access address range of to-be-accessed SPI FLASH, the controller being configured with a protection address range of preset SPI FLASH, and the access comprising write or erase (101); and the controller determines whether the access address range of the to-be-accessed SPI FLASH is at least partially overlapped with the protection address range of the preset SPI FLASH; and if the access address range is at least partially overlapped with the protection address range, the controller triggers a protection mechanism of some addresses in the access address range of the to-be-accessed SPI FLASH overlapped with the protection address range of the preset SPI FLASH (102). By means of the write protection method for SPI FLASH and the controller, the problem that a protected space of SPI FLASH is written by mistake can be avoided; moreover, SPI FLASH of different manufacturers or different models can be compatible.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a write protection method and controller for SPI FLASH. Background technique [0002] FLASH is generally used in existing communication devices or electronic devices to store key data. In most scenarios, these critical data cannot be rewritten or lost, otherwise it will cause irreversible damage to the entire device. With the development of technology, an important development direction of communication equipment or electronic equipment is product miniaturization. In product design, device selection is more inclined to select devices with fewer pins and smaller PCB area. Therefore, serial interface FLASH (SPI FLASH) is gradually used in general equipment or electronic equipment to replace parallel FLASH, so as to reduce the number of pins for reading and writing FLASH, and reduce the hardware PCB area. [0003] The existing SPI FLASH device itself provides a write protec...

AI Technical Summary

Problems solved by technology

In this process, the space to be protected in SPI FLASH is easily written by mistake

Moreover, there are differences between the configuration processes and configuration methods of the write protection of FLASH devices from different manufacturers, and the software needs to be distinguished during configuration, which increases the complexity of software processing

In addition, the write protection function provided by SPI FLASH can only start from the head or end of the address space of the SPI FLASH, and protect it in multiples of a fixed space unit, and the protected address space must be continuous

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