CN113140251A - Method and system for detecting RAM in production line test - Google Patents
Method and system for detecting RAM in production line test Download PDFInfo
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- CN113140251A CN113140251A CN202110434148.6A CN202110434148A CN113140251A CN 113140251 A CN113140251 A CN 113140251A CN 202110434148 A CN202110434148 A CN 202110434148A CN 113140251 A CN113140251 A CN 113140251A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/10—Test algorithms, e.g. memory scan [MScan] algorithms; Test patterns, e.g. checkerboard patterns
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/48—Arrangements in static stores specially adapted for testing by means external to the store, e.g. using direct memory access [DMA] or using auxiliary access paths
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/56—External testing equipment for static stores, e.g. automatic test equipment [ATE]; Interfaces therefor
- G11C29/56008—Error analysis, representation of errors
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- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
The invention provides a method for detecting RAM in production line test, which comprises the following steps: the data downloading station sets a data packet and establishes connection with the detection equipment; before the detection equipment downloads the data packet, randomly extracting a single data storage unit from the RAM, performing read-write operation, and detecting RAM information; the detection equipment downloads the data packet and detects RAM information in the downloading process; starting up for inspection after the data packet is downloaded, and detecting information of the RAM in the operation process through an information abstract algorithm; running the RAM at the maximum load of the aging station, and detecting the information of the RAM in the operation process through the operation of an information abstraction method and the continuous operation of the residual space in the RAM; factory settings are restored, and RAM information is restarted and detected; and displaying the detection result. According to the invention, by combining multiple detection means with repeated detection, the bad RAM can be intercepted at the maximum probability under the condition of not increasing the detection period, and the problem that the RAM fault cannot be found in a single test is solved.
Description
Technical Field
The invention relates to the field of embedded system detection, in particular to a method and a system for detecting an RAM in production line test.
Background
With the development of microprocessor technology, embedded processors are increasingly used in various fields of national economy. In various embedded processors, a Random Access Memory (RAM) is an important component as a storage unit of data and programs, whether the RAM is normal or not is directly related to whether the embedded processor can work normally, and in order to ensure the correctness of data processing and the normal operation of the programs, the RAM needs to be detected before the embedded processor works.
For example, LPDDR3, although the memory chip particles are tested layer by layer, a certain proportion of defective products will flow out, especially the sealing capability of different manufacturers will be different, and the defective proportion will be very different. In the production process of the product using the material, a production line can also be provided with a plurality of work stations for detecting the functions and the performances of the product so as to ensure the quality of the product after leaving the factory. The detection station generally comprises main stations of basic functions, power consumption, radio frequency performance, audio performance, photographing performance, water resistance, aging and the like, and the test for the RAM device is mainly carried out in the aging station. The aging station actually enables the product to circularly work for a certain time at the maximum load as far as possible under a certain environmental condition so as to accelerate the use strength of the product and expose the problem in advance, so that defective products can be intercepted on a production line. However, aging is generally performed in a fixed mode, which cannot cover the maximum addressing range of the RAM device, resulting in incomplete detection and incomplete exposure.
The defects of the RAM are often characterized and not stable and reproducible, so that the defects are often not found in a single test, and therefore, a method for detecting the poor RAM in the production line test is needed to be improved as much as possible.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a system for detecting the RAM in production line testing, which can intercept the bad RAM with the maximum probability under the condition of not increasing the detection period by combining multiple detection means with repeated detection, thereby solving the problem that the fault of the RAM cannot be found in a single test.
The method for detecting the RAM in the production line test comprises the following steps:
step 1: the data downloading station sets a data packet and establishes connection with detection equipment provided with an RAM to be detected;
step 2: the detection equipment randomly extracts one or more data storage units from all areas of the RAM, performs read-write operation and detects whether the RAM has faults or not;
and step 3: when the detection equipment randomly extracts one or more data storage units from all areas of the RAM for read-write operation and does not detect that the RAM has a fault, the detection equipment starts to download a data packet and detects whether the RAM has errors in the downloading process;
and 4, step 4: when the detection equipment detects that the RAM has no errors in the downloading process, the detection equipment performs on-line check after the data packet is downloaded, and detects whether the RAM has errors in the operation process through an information abstract algorithm;
and 5: when the detection equipment is started to check after the data packet is downloaded, and the RAM is not detected to have errors in the operation process through the information abstraction algorithm, the detection equipment carries out aging test on the RAM in an aging station, runs the RAM under the maximum load for a long time, and detects whether the RAM has errors in the operation use process through the information abstraction method operation and continuous operation on the residual space in the RAM;
step 6: when the detection equipment carries out aging test on the RAM in an aging station, the RAM is operated by an information abstraction method and continuously operated on the residual space in the RAM, and errors are not detected in the operation and use process of the RAM, the detection equipment restores factory settings after the aging test is finished, and restarts to detect whether the RAM has faults or not;
and 7: and when the detection equipment is reset to factory settings after the aging test is finished, and the failure of the RAM is not detected after the detection equipment is restarted, the detection equipment displays that the detection is finished, and the RAM is qualified.
In step 3, when the detection device detects that the RAM has an error in the downloading process, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC to prompt an operator.
In step 2, when the detection device randomly extracts one or more data storage units from all areas of the RAM to perform read-write operation, and detects that the RAM has a fault, the detection device ends the detection process, displays the fault information of the RAM, and sends the fault information to the PC to prompt an operator.
In step 4, when the detection device performs a startup check after the data packet is downloaded, and detects that the RAM has an error in the operation process through the information summarization algorithm, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC terminal to prompt an operator.
The invention is further improved, in the step 5, when the detection device carries out aging test on the RAM in the aging station, and detects that the RAM has errors in the operation and use process through the operation of the information abstraction method and the continuous operation on the residual space in the RAM, the detection device finishes the detection process, displays the RAM fault information and sends the RAM fault information to the PC end to prompt the operator.
In step 6, when the detection device is restored to factory settings after the aging test is completed, and the detection device is restarted and detects that the RAM has a fault, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC to prompt an operator.
The invention also provides a system for realizing the method for detecting the RAM in the production line test, which comprises detection equipment, a data downloading station and an aging station, wherein the detection equipment comprises:
the first communication module is used for establishing connection with the data downloading station and sending RAM fault information to the PC end to prompt an operator;
a download module for downloading the data package from the data download station;
the detection module is used for detecting whether faults exist in the processes of starting, operation and use of the RAM;
and the display module is used for displaying the detection result and the related information of the RAM.
In a further refinement of the present invention, the data download station comprises:
and the second communication module is used for establishing connection with the data downloading station and sending the data packet to the detection equipment.
The invention has the beneficial effects that: by combining multiple detection means with repeated detection, the bad RAM can be intercepted in production line test at the maximum probability under the condition of not increasing the original detection period and detection cost of the RAM, and the problems that single test is not comprehensive enough and the faults of the RAM cannot be found frequently are solved.
Drawings
FIG. 1 is a flow chart of the method for detecting RAM in production line test according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, a method for detecting a RAM in a production line test according to the present invention includes the following steps:
step 1: the data downloading station sets a data packet and establishes connection with detection equipment provided with an RAM to be detected;
step 2: the detection equipment randomly extracts one or more data storage units from all areas of the RAM, performs read-write operation and detects whether the RAM has faults or not;
and step 3: when the detection equipment randomly extracts one or more data storage units from all areas of the RAM for read-write operation and does not detect that the RAM has a fault, the detection equipment starts to download a data packet and detects whether the RAM has errors in the downloading process;
and 4, step 4: when the detection equipment detects that the RAM has no errors in the downloading process, the detection equipment performs on-line check after the data packet is downloaded, and detects whether the RAM has errors in the operation process through an information abstract algorithm;
and 5: when the detection equipment is started to check after the data packet is downloaded, and the RAM is not detected to have errors in the operation process through the information abstraction algorithm, the detection equipment carries out aging test on the RAM in an aging station, runs the RAM under the maximum load for a long time, and detects whether the RAM has errors in the operation use process through the information abstraction method operation and continuous operation on the residual space in the RAM;
step 6: when the detection equipment carries out aging test on the RAM in an aging station, the RAM is operated by an information abstraction method and continuously operated on the residual space in the RAM, and errors are not detected in the operation and use process of the RAM, the detection equipment restores factory settings after the aging test is finished, and restarts to detect whether the RAM has faults or not;
and 7: and when the detection equipment is reset to factory settings after the aging test is finished, and the failure of the RAM is not detected after the detection equipment is restarted, the detection equipment displays that the detection is finished, and the RAM is qualified.
As shown in fig. 1, in step 3, when the detection device detects that the RAM has an error in the downloading process, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC to prompt the operator.
As shown in fig. 1, in step 2, when the detection device randomly extracts one or more data storage units from all areas of the RAM, performs read-write operation, and detects that the RAM has a fault, the detection device ends the detection process, displays the fault information of the RAM, and sends the fault information to the PC to prompt an operator.
As shown in fig. 1, in step 4, when the detection device performs an on-machine check after the data packet is downloaded, and detects that an error occurs in the operation process of the RAM through the information summarization algorithm, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC terminal to prompt an operator.
As shown in fig. 1, in step 5, when the detection device performs an aging test on the RAM in the aging station, and detects that the RAM has an error in the operation and use process through the information abstraction method operation and the continuous operation on the remaining space inside the RAM, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC terminal to prompt an operator.
As shown in fig. 1, in step 6, after the aging test of the detection device is completed, factory settings are restored, and when a fault is detected in the RAM by restarting, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC to prompt an operator.
As shown in fig. 1, the present invention further provides a system for implementing the method for detecting a RAM in a production line test, including a detection device, a data downloading station, and an aging station, where the detection device includes:
the first communication module is used for establishing connection with the data downloading station and sending RAM fault information to the PC end to prompt an operator;
a download module for downloading the data package from the data download station;
the detection module is used for detecting whether faults exist in the processes of starting, operation and use of the RAM;
and the display module is used for displaying the detection result and the related information of the RAM.
As shown in fig. 1, the data download station includes:
and the second communication module is used for establishing connection with the data downloading station and sending the data packet to the detection equipment.
A Random Access Memory (RAM), also called "RAM", is an internal memory that exchanges data directly with the CPU, also called main memory. It can be read and written at any time, and is fast, usually used as temporary data storage medium of operating system or other running program. The memory can be accessed at will according to the requirement, and the access speed is independent of the position of the memory unit. Such a memory loses its memory contents when power is off, and is therefore mainly used for storing programs for a short time. According to the working principle of the memory unit, the random access memory is further divided into a Static random access memory (Static RAM, SRAM) and a Dynamic random access memory (Dynamic RAM, DRAM).
Message Digest Algorithm (MD 5) is used to ensure that the information transfer is complete and consistent. Is one of the hash algorithms (also known as digest algorithm and hash algorithm) widely used by computers, and the mainstream programming language is generally realized by MD 5. The operation of data (such as Chinese characters) into another fixed length value is the basic principle of the hash algorithm, and the precursors of MD5 include MD2, MD3 and MD 4.
The MD5 algorithm has the following characteristics:
1. compressibility: for any length of data, the calculated length of the MD5 value is fixed.
2. Easy to calculate: it is easy to calculate the MD5 value from the raw data.
3. Resistance to modification: any change to the original data, even if only 1 byte is modified, can result in a great difference in the value of MD 5.
4. Strong collision resistance: knowing the original data and its MD5 value, it is very difficult to find a data with the same MD5 value (i.e., counterfeit data).
MD5 functions to allow large volumes of information to be "compressed" into a secure format (i.e., to convert a byte string of any length into a fixed-length hexadecimal digital string) before the private key is signed by digital signature software.
The data downloading station sets the data packet as the maximum value which can be accepted by the RAM operation, mainly increases the area which can not change the content in the using process of a user, and aims to increase the probability of downloading errors caused by the problem of the RAM in the downloading process. A DDR Check function is added in a data downloading station, and the function is to randomly and independently extract one or more data storage units from all areas of the RAM, perform read-write operation and detect whether errors occur in the RAM. After the first restart check after downloading is completed, after the downloading of software is completed, the first boot usually occupies more RAM space as much as possible due to the initialization of a large amount of data, so that the probability of detecting poor RAM is increased. The MD5 algorithm is an information summarization algorithm, a fixed 128-value hash value is obtained by calculating MD5 for a section of fixed data, MD5 is calculated for a plurality of times for the area of the fixed data in the RAM, and the consistency of MD5 is compared, so that the accuracy of operation in the RAM can be repeatedly detected, and the probability of detecting poor RAM is improved. The MD5 operation and the Memory test are added in the aging process of the product, the Memory test is to continuously perform operations of addition, subtraction, multiplication, division, AND, OR, XOR and the like on the residual RAM space in the equipment, the reliability of the RAM is tested, the aging time of the product is generally several hours, dozens of hours or even longer, so that a large amount of tests on the RAM at the station are more suitable, and the MD5 and the Memory test are combined together, so that the success rate of detecting poor RAM can be improved. And after the test of all the stations of the production line is finished, the factory settings are restored, and the inspection is restarted. In this step, all user data is deleted, the device is automatically restarted, and the initialization is performed again, so that a program for detecting a bad RAM is added.
From the above, the beneficial effects of the invention are as follows: by combining multiple detection means with repeated detection, the bad RAM can be intercepted in production line test at the maximum probability under the condition of not increasing the original detection period and detection cost of the RAM, and the problems that single test is not comprehensive enough and the faults of the RAM cannot be found frequently are solved.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A method for detecting RAM in production line test is characterized by comprising the following steps:
step 1: the data downloading station sets a data packet and establishes connection with detection equipment provided with an RAM to be detected;
step 2: the detection equipment randomly extracts one or more data storage units from all areas of the RAM, performs read-write operation and detects whether the RAM has faults or not;
and step 3: when the detection equipment randomly extracts one or more data storage units from all areas of the RAM for read-write operation and does not detect that the RAM has a fault, the detection equipment starts to download a data packet and detects whether the RAM has errors in the downloading process;
and 4, step 4: when the detection equipment detects that the RAM has no errors in the downloading process, the detection equipment performs on-line check after the data packet is downloaded, and detects whether the RAM has errors in the operation process through an information abstract algorithm;
and 5: when the detection equipment is started to check after the data packet is downloaded, and the RAM is not detected to have errors in the operation process through the information abstraction algorithm, the detection equipment carries out aging test on the RAM in an aging station, runs the RAM under the maximum load for a long time, and detects whether the RAM has errors in the operation use process through the information abstraction method operation and continuous operation on the residual space in the RAM;
step 6: when the detection equipment carries out aging test on the RAM in an aging station, the RAM is operated by an information abstraction method and continuously operated on the residual space in the RAM, and errors are not detected in the operation and use process of the RAM, the detection equipment restores factory settings after the aging test is finished, and restarts to detect whether the RAM has faults or not;
and 7: and when the detection equipment is reset to factory settings after the aging test is finished, and the failure of the RAM is not detected after the detection equipment is restarted, the detection equipment displays that the detection is finished, and the RAM is qualified.
2. The method as claimed in claim 1, wherein in step 3, when the detecting device detects that the RAM has an error during the downloading process, the detecting device ends the detecting process, displays the RAM failure information, and sends the RAM failure information to the PC to prompt the operator.
3. The method as claimed in claim 2, wherein in the step 2, when the detecting device randomly extracts one or more data storage units from all areas of the RAM for performing read-write operation, and detects that the RAM has a fault, the detecting device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC to prompt the operator.
4. The method as claimed in claim 3, wherein in the step 4, when the detection device performs a startup check after the data packet is downloaded, and detects that the RAM has an error in the operation process through the information summarization algorithm, the detection device ends the detection process, displays the RAM failure information, and sends the RAM failure information to the PC to prompt the operator.
5. The method as claimed in claim 4, wherein in the step 5, when the detecting device performs the aging test on the RAM in the aging station, and detects that the RAM has errors in the operation process through the information abstraction method operation and the continuous operation on the residual space inside the RAM, the detecting device ends the detection process, displays the RAM failure information, and sends the RAM failure information to the PC terminal to prompt the operator.
6. The method as claimed in claim 6, wherein in step 6, when the detection device recovers from factory after the burn-in test is completed, and when the detection device restarts to detect that the RAM has a fault, the detection device ends the detection process, displays the RAM fault information, and sends the RAM fault information to the PC terminal to prompt the operator.
7. A system for realizing the method for detecting the RAM in the production line test as claimed in any one of claims 1 to 6, wherein the system comprises a detection device, a data downloading station and an aging station, wherein the detection device comprises:
the first communication module is used for establishing connection with the data downloading station and sending RAM fault information to the PC end to prompt an operator;
a download module for downloading the data package from the data download station;
the detection module is used for detecting whether faults exist in the processes of starting, operation and use of the RAM;
and the display module is used for displaying the detection result and the related information of the RAM.
8. The system of claim 7, wherein: the data download station comprises:
and the second communication module is used for establishing connection with the data downloading station and sending the data packet to the detection equipment.
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