RAM internal storage detection method and device

Abstract

The invention provides an RAM internal storage detection method. The method includes the steps that it is determined that data in an RAM internal storage area to be detected are true codes; one's complement codes generated after negation is conducted on the true codes are stored into a backup internal storage area; if same data exist in the true codes and the one's complement codes, it is judged that physical damages exist in the data in the true codes, or else negation operation is conducted on the one's complement codes read from the backup internal storage area, a CRC algorithm is utilized to check data on which the negation operation is conducted, and then backup CRC check codes are generated; original CRC check codes corresponding to the true codes and the backup CRC check codes are compared, whether the original CRC check codes corresponding to the true codes and the backup CRC check codes are consistent or not is judged, if yes, it is judged that a data line relevant to the RAM internal storage area to be detected is not damaged or the data in the true codes are not tampered, and if not, it is judged that the data line relevant to the RAM internal storage area to be detected is damaged or the data in the true codes are tampered. Consequently, by the adoption of the RAM internal storage detection method and device, the reason for causing incorrect data storage can be detected.

Description

technical field [0001] The present application relates to the field of memory detection, in particular to a RAM memory detection method and device. Background technique [0002] At present, in order to enhance the anti-interference and error identification capabilities of the single-chip microcomputer and prevent the data in the RAM (Random Access Memory) memory of the single-chip microcomputer from being tampered with or lost, it is necessary to detect the data in the RAM memory of the single-chip microcomputer. [0003] At present, the traditional CRC (Cyclical Redundancy Check) algorithm is usually used to judge whether the data storage in the RAM memory of the microcontroller is correct. Although the traditional CRC algorithm can detect whether the data storage in the RAM memory is correct, it cannot detect the cause Reasons for incorrect data storage, such as physical damage to data and damage to the data line of the microcontroller. [0004] It can be seen from the ab...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional CRC (Cyclical Redundancy Check) algorithm is usually used to judge whether the data storage in the RAM memory of the microcontroller is correct. Although the traditional CRC algorithm can detect whether the data storage in the RAM memory is correct, it cannot detect the cause Reasons for incorrect data storage, such as physical damage to data and damage to the data line of the microcontroller

[0004] It can be seen from the above that the current method of detecting whether the data storage in the single-chip RAM memory is correct has the disadvantage of not being able to detect the cause of the incorrect data storage.

Images