Nondestructive internal storage online testing method

Abstract

The invention discloses a nondestructive internal storage online testing method which includes the following steps: determining a time upper limit required for carrying out a complete test on an internal storage, enabling the internal storage test to be distributed to operational free time of a task main program in each period to be executed, enabling a part of the internal storage to be tested in each period, enabling the accumulated time for completing the internal storage test in the periods to be incapable of exceeding the set time, thinning the granularity of the tested part of the internal storage in each period, dividing each tested part into a plurality of time slices to be executed, guaranteeing responding time of interrupt signals or life signals, backuping a tested internal storage sheet, then adopting a destructive testing method to the internal storage sheet, and then recovering the tested internal storage sheet. The nondestructive internal storage online testing method has the advantages that the aim of safety testing of a high-capacity internal storage is achieved, the problem of delaying of interrupt responses in a high-real-time-performance safety system under the internal storage testing condition is solved, the destructive method is applied to nondestructive internal storage online testing, the internal storage fault testing coverage rate is improved, and key static data of the internal storage are not damaged.

Description

technical field [0001] The invention belongs to the field of software algorithms and is used for online detection of the correctness of memory execution functions. Background technique [0002] In industrial control systems and safety signal systems (applied in avionics, railway signals, nuclear power and other industries), the functional safety of volatile memory is a very critical one of all safety components, because this type of memory can be stored and modified at will, flexible High reliability, which greatly improves the execution efficiency of the program, but at the same time brings great security risks to the system. In the security field, it is often necessary to periodically check the memory to ensure that memory errors are discovered in time, start the fault management mechanism, and take timely actions. Safety measures to avoid more serious accidents. [0003] Memory failure modes are relatively clear and can be divided into three categories (fixed faults, cou...

AI Technical Summary

Problems solved by technology

[0012] The beneficial effects of the present invention are: the problem of safety detection of large-capacity memory is realized, and the problem of delay in responding to interrupts in the case of memory inspection in a high-real-time security system is solved; the use of the destructive method itself is applied In the non-destructive memory online detection, it not only improves the coverage of memory fault detection but also does not destroy the key static data of the memory

Images