Random access memory (RAM) online detection apparatus and method

A random access memory and detection device technology, applied in static memory, instruments, etc., can solve problems such as lack of online detection solutions, lack of detection methods, and no clear solutions

Active Publication Date: 2017-12-26
XIAN FLIGHT SELF CONTROL INST OF AVIC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] 1) There is no effective detection method for the stack storage space used by the program to run;
[0007] 2) For the selection of the original

Method used

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  • Random access memory (RAM) online detection apparatus and method
  • Random access memory (RAM) online detection apparatus and method

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0039] The invention proposes a random access memory detection method, which improves the existing method, can reduce the missed detection rate of common mode interference, improves the memory detection coverage, and can realize full-area online periodic detection of the random access memory.

[0040] Embodiment 1 of the present invention will be described in detail below in conjunction with the accompanying drawings, and the specific implementation steps are as follows figure 1 shown, including:

[0041] 1) The first control unit receives the external detection instruction and the status report of the detection execution unit, and outputs the storage space information to be tested to the second control unit and the detection execution unit;

[0042] 2) The second control part selects the stack segment for...

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Abstract

The invention relates to a RAM online detection apparatus, which comprises a first control part, a true form generating part, a second control part, a detection executing part, and a result reporting part. The invention further relates to a RAM online detection method. The method comprises the following steps: receiving a detection command; selecting a stack segment for switching program run; selecting a detection true form; writing the detection true form into each memory unit of a memory space to be detected, backward reading each memory unit value; writing detection true form negation into a first unit, backward reading for judgment; repeating the steps until all memory unit of the memory space are written and backward read; recovering the memory space to a state before the detection, waiting for next detection; and reporting and outputting the results. The provided method and apparatus can detect all areas of a RAM on-line in real time without affecting the normal operation of equipment.

Description

technical field [0001] The invention belongs to the technical field of built-in self-testing (BIT) of computers, and relates to an on-line testing device and method of a random access memory. Background technique [0002] Existing methods for detecting random access memory, one of which is to divide the internal space of RAM into the space segment where the detection program is located and other space segments, and realize the detection of the original position of the detection program by copying the detection program and updating the address in the program. [0003] Existing methods for detecting random access memory, the other is to take the data in the RAM area to be tested as the original code, write it into the backup memory area after inversion, if the same data exists in the original code and the inverse code, determine the original code Otherwise, the data in the backup memory area is reversed, and the CRC and the original code are used for verification. If they are ...

Claims

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Application Information

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IPC IPC(8): G11C29/38
CPCG11C29/38
Inventor 侯明颜纪迅刘羽冯博姜丹琼
Owner XIAN FLIGHT SELF CONTROL INST OF AVIC
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