Method and system for detecting random access memory

Abstract

The invention provides a method and a system for detecting a random access memory. The method comprises the following steps of monitoring connecting ports of a first processor and a primary random access memory by a second processor; if the first processor is monitored to write data in a first address of the primary random access memory, obtaining the data, reversing the data, and then writing reversed data in a second address of a standby random access memory; if the first processor is monitored to read data from the first address of the primary random access memory, obtaining the data read from the first address by the first processor, read the data from the second address, comparing the data read from the first address with the data read from the second address, and outputting a detection signal according to a comparison result. As being seen, the method and the system for detecting the random access memory can be used for detecting the data transmission of the primary random access memory in real time, moreover, the data are not needed to be written in all addresses, and thus, the time consumption is reduced. Furthermore, a common cause failure factor can be avoided quite well.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a detection method and system of a random access memory. Background technique [0002] Synchronous Dynamic Random Access Memory (English: Synchronous Dynamic Random Access Memory, referred to as SDRAM) and other random access memories have the characteristics of low price, high data transmission rate, and simple manufacturing process, and are widely used in digital circuit systems. [0003] However, due to the influence of electromagnetic interference or process defects, random access memory has a certain probability of single-bit state flip error during data transmission, and wrong data transmission may cause errors in system operation and even threaten system security. Since the random access memory usually does not have a self-test function, how to detect the data transmission of the random access memory is a key factor to ensure the safe operation of the system. [0004] A ...

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Problems solved by technology

[0005] However, this detection method can only be detected before the random access memory is officially used, and the real-time performance is very poor, and the flip error that occurs during use cannot be detected

Moreover, it is necessary to write data in all addresses of the random access memory during the detection, and the detection takes a long time.

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