CN115580722A - Redundant switching method for multi-station parallel image test - Google Patents
Redundant switching method for multi-station parallel image test Download PDFInfo
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Abstract
The invention provides a redundant switching method for multi-station parallel image testing, which comprises the following steps: s1: establishing an image test system with a redundant iPC; s2: issuing a parallel image test task; enabling each channel matching unit, an image capture card at the front end of the channel matching unit, a working iPC at the rear end of the channel matching unit and a redundancy switching unit; s3: constructing a working data transmission channel; s4: fault redundancy switching; when a working iPC of a certain working data transmission channel fails, a second output end of a channel matching unit corresponding to the failed working iPC is enabled, and a task issuing unit enables a redundant iPC; s5: removing redundancy; and when the working iPC marked as the fault state is recovered to be normal, the original working data transmission channel is recovered, or a new working data transmission channel is established with another channel matching unit. Redundant switching does not need an external control signal, and response is quick and accurate.
Description
Technical Field
The invention relates to the technical field of image sensor detection, in particular to a redundancy switching method for multi-station parallel image testing.
Background
The existing production test system of the CIS (Image Sensor CMOS Image Sensor) realizes the loading, unloading, alignment, digital direct current test or the judgment and classification of the imaging quality of the CIS to be tested by depending on the computer control. With the ever increasing demand for capacity, the demand for high-throughput, parallel-test CIS test systems has increased, and 16-parallel, 32-parallel, and even higher parallel-test numbers of test systems are on the market. A typical CIS test system, as shown in the top diagram of fig. 1, is divided into four major parts: the system comprises an interface mechanism responsible for loading and unloading the CIS object to be tested, an interface circuit responsible for electronic signal switching and guiding, a digital direct current testing device responsible for testing current, voltage and digital functions and an image testing device responsible for imaging quality analysis testing, wherein the image testing device can be divided into two parts, namely an image acquisition card responsible for acquiring CIS image data and an image operation computer iPC responsible for calculating and analyzing CIS imaging quality, which are shown in the lower graph in figure 1. Typically, a set of CIS high and test systems uses as many image calculation computers as there are high and test stations, i.e., 32 parallel test systems require 32 image calculation computers. Because the image operation computer is operated for 24 hours, the computer is not shut down all the year round basically, and the phenomenon of fault shutdown is inevitable in the continuous use process, the test capacity corresponding to the station is lacked before the fault image operation computer is well maintained.
Besides selecting a sufficient number of iPCs, an iPC image testing device also needs a certain redundancy design, thereby further improving the reliability of the image testing system and the whole CIS testing system. The redundant iPC needs to be put into the system in time to replace the failed iPC, so that the normal test station and the capacity are not influenced. The chinese patent application with publication number CN103558543A provides a method for testing the mass production of CIS chips, and the method discloses that the CIS chips acquire images and output the images to the MIPI bridge chip, the MIPI bridge chip converts the images into parallel data and sends the parallel data to the FPGA module, the FPGA processes the acquired images and sends the results to the content of the tester last time, but the scheme does not provide a scheme for replacing faulty devices by redundant switching. Therefore, it is necessary to provide a parallel switching method for testing redundancy test equipment by CIS images, so as to avoid the reduction of detection capacity caused by iPC failure.
Disclosure of Invention
In view of the above, the invention provides a redundancy switching method for multi-station parallel image testing, which can reliably switch a redundant iPC into a replacement failure iPC.
The technical scheme of the invention is realized as follows: the invention provides a redundant switching method for multi-station parallel image testing, which comprises the following steps:
s1: establishing an image test system comprising a task issuing unit, a plurality of channel matching units, redundant switching units, a task updating unit, N working iPCs and M redundant iPCs; n and M are positive integers;
s2: issuing a parallel image test task; establishing a parallel image test task by the task issuing unit until the upper limit of the parallel image test task is reached; and respectively enabling each channel matching unit, an image capture card at the front end of the channel matching unit, a working iPC at the rear end of the channel matching unit and a redundancy switching unit;
s3: constructing a working data transmission channel; the task issuing unit enables the first output end of each channel matching unit to correspondingly communicate and connect the first output end with the input end of a working iPC to form a working data transmission channel of the working iPC, which is the first output end of the channel matching unit; the task updating unit acquires state parameters of each equipment port of the working data transmission channel;
s4: fault redundancy switching; when a working iPC of a certain working data transmission channel fails, a second output end of a channel matching unit corresponding to the failed working iPC is enabled, and a task issuing unit enables a redundant iPC; the input end of the redundancy switching unit is in communication connection with the second output end of the channel matching unit, and the output end of the redundancy switching unit is in communication connection with the input end of the redundancy iPC to form a redundancy data transmission channel of the second output end of the channel matching unit, the redundancy switching unit and the redundancy iPC; the task updating unit acquires the state parameters of each equipment port of the redundant data transmission channel;
s5: removing redundancy; and when the working iPC marked as the fault state is recovered to be normal, disconnecting the redundant data transmission channel for replacing the working data transmission channel corresponding to the working iPC, and recovering the original working data transmission channel or establishing a new working data transmission channel with another channel matching unit.
On the basis of the above technical solution, preferably, in the step S3, the working data transmission channel forming the first output end of the channel matching unit, i.e., the working data transmission channel of the working iPC, is to make the channel matching unit in a normal working state, the channel matching unit further obtains differential signals between the first output end of the channel matching unit and the input end of the working iPC, and latches and logically operates the obtained differential signals, if an output result of the latch and logical operation is 1, it indicates that the working data transmission channel is successfully established, and the channel matching unit feeds back a result of the successful establishment of the working data transmission channel to the task updating unit; if the output result of the latch and logic operation is 0, the logic operation is tried again until the maximum retry number is reached or the set termination time is reached, if no effective output result exists all the time, the result that the working data transmission channel is not successfully established is fed back to the task updating unit, and the task updating unit marks that the current working iPC is in fault.
Preferably, in the step S4, the redundant data transmission channel forming the second output end of the channel matching unit, the redundant switching unit and the redundant iPC is configured to enable the channel matching unit and the redundant switching unit to be in a normal working state, respectively obtain differential signals of the second output end of the channel matching unit, the input end and the output end of the redundant switching unit and the input end of the redundant iPC, respectively latch and logically operate the obtained differential signals, if an output result of the latch and logical operation is 1, it indicates that the redundant data transmission channel is successfully established, and the channel matching unit feeds back a result of the successful establishment of the working data transmission channel to the task updating unit; if the output result of the latch and logic operation is 0, the logic operation is tried again until the maximum retry number is reached or the set termination time is reached, if no effective output result exists all the time, the result that the redundant data transmission channel is not successfully established is fed back to the task updating unit, the task updating unit marks that the current redundant iPC is in failure, the task issuing unit enables another redundant iPC, and the process is carried out again until the redundant data transmission channel is successfully established.
Preferably, the latching and logic operation is to perform sampling and gate operation on a differential signal obtained from a differential signal between a first output end of the channel matching unit and an input end of a working iPC, or perform sampling and gate operation on a differential signal obtained from a second output end of the channel matching unit, an input end and an output end of the redundant switching unit, and an input end of the redundant iPC.
Preferably, the differential signal is an operating clock differential signal.
Further preferably, the task update unit includes a task update list and a task cache list; on one hand, the task updating unit establishes a task updating list comprising a plurality of first state parameter items according to the state parameters of each equipment port of the working data transmission channel, and periodically confirms the validity of each content of each first state parameter item in the task updating list according to an updating period T1; on the other hand, the task updating unit collects the state parameters of each equipment port of the redundant data transmission channel, correspondingly establishes one or more second state parameter items in the task updating list, and periodically confirms the validity of each content of the second state parameter items according to the updating period T2; transferring a first state parameter item corresponding to the working iPC marked as the fault state and a second state parameter item corresponding to the redundant iPC marked as the fault state from the task updating list to the task cache list; the total number of the first state parameter items and the second state parameter items in the task updating list is not more than N; and the total number of the first state parameter items or the second state parameter items in the task cache list does not exceed M.
Preferably, the first state parameter item includes a port address of a first output end of a channel matching unit forming the working data transmission channel, a port address of an input end of the working iPC, a port mapping relationship between the first output end of the channel matching unit and the input end of the working iPC, and a remaining survival time of the working data transmission channel; the task updating unit regularly confirms whether the content of each first state parameter item in the task updating list is legal and effective according to a period T1, and the residual survival time of the working data transmission channel of the confirmed normal first state parameter item is automatically increased by T1+ delta T1; Δ T1 is the necessary delay of the task updating unit for confirming the current first state parameter item, and Δ T1 is smaller than T1; the method comprises the steps that a first state parameter item which is not confirmed to be normal in K continuous updating periods T1 is moved into a task cache list from a task updating list; k is less than N;
the second state parameter items comprise port addresses of second output ends of a channel matching unit forming the redundant data transmission channel, port addresses of input ends and output ends of a redundant switching unit, port addresses of input ends of a redundant iPC, port mapping relations of a second output end of the channel matching unit and input ends of the redundant switching unit, port mapping relations of output ends of the redundant switching unit and input ends of the redundant iPC and residual survival time of the redundant data transmission channel, the task updating unit periodically confirms whether contents of the second state parameter items in the task updating list are legal and effective according to a period T2, the residual survival time of the redundant data transmission channel of the confirmed normal second state parameter items is automatically increased by T2+ Deltat 2, deltat 1 is necessary delay of the task updating unit for confirming the current second state parameter items, and Deltat 2 is smaller than T2; and in the continuous K updating periods T2, the normal second state parameter item is not confirmed, and the second state parameter item is moved from the task updating list into the task cache list.
Preferably, the working iPC marked as the fault state in step S5 is recovered to normal, that is, the task updating unit adopts an unfixed period T3 to confirm the port state parameters of each device of the working data transmission channel where the working iPC with the fault is located, and after a specified qualified number of times is reached or after normal working time is accumulated, the working iPC with the fault is determined to be recovered to normal, before the next updating period T1, the redundant data transmission channel replacing the working iPC with the fault state on the same day is disconnected, the second state parameter item corresponding to the redundant iPC is moved out of the task updating list, and meanwhile, the first state parameter item corresponding to the working data transmission channel corresponding to the working iPC with the normal recovery is moved back to the task updating list, and the connection state of the working data transmission channel is recovered; or when the first output end of the channel matching unit corresponding to the original working data transmission channel is occupied, constructing a new working data transmission channel by the recovered normal working iPC and another channel matching unit which normally works.
Preferably, the task updating unit adopts an unfixed period T3 to update the failed working iPCThe port state parameters of each device of the working data transmission channel are confirmed, and the qualified times are N = A ([ N/10 ]) when the specified qualified times or the accumulated normal working time are reached]+ 1), square brackets are rounding operations, and A is an adjustment coefficient; or let the accumulated time be
，i=1，2，3，…，m，iAnd the number of times of continuously confirming the port state parameters of each device of the working data transmission channel where the failed working iPC is located is accumulated by adopting an unfixed period T3.
On the basis of the above technical solution, preferably, the channel matching unit further includes a data caching module, the data caching module is configured to cache test data of the CIS under test acquired by an image capture card at the front end of the current channel matching unit, and periodically send a data integrity request message for the last sent CIS test data to a working iPC or a redundant iPC corresponding to a working data transmission channel or a redundant data transmission channel established by the current channel matching unit, after the data integrity request message is received by the working iPC or the redundant iPC, the content of the message is checked, a value of a field in the integrity request message of the last CIS test data is changed, and the data integrity request message is returned to the data caching module again, after the data caching module verifies integrity of the last sent CIS test data, the cached next CIS test data adjacent to the last sent CIS test data is sent to the corresponding working iPC or redundant iPC.
Compared with the prior art, the redundancy switching method for the multi-station parallel image test has the following beneficial effects:
(1) The scheme provides a method which can autonomously monitor the working state of a working iPC or a redundant iPC and automatically replace a fault working iPC or a redundant iPC by using the redundant iPC; the working states of all ports of the corresponding working data transmission channels or redundant data transmission channels are periodically detected, the states of all ports and the survival time of the subsequent data transmission channels are periodically updated in the task updating unit, and the reliability and the stability of the image testing system are ensured;
(2) The mode of monitoring the differential signals of each port of the working data transmission channel or the redundant data transmission channel is adopted, so that the anti-interference performance can be improved, and only the effective differential signals indicate that the port is in a normal working state and can carry out effective data transmission.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a typical CIS test system and a data transmission diagram of an image operation computer iPC;
FIG. 2 is a flowchart of the redundancy switching method for multi-station parallel image testing according to the present invention;
FIG. 3 is an architecture diagram of an image testing system according to the redundancy switching method of multi-station parallel image testing of the present invention;
fig. 4 is a schematic diagram of the latch and the logical operation established by the working data transmission channel of the redundancy switching method for the multi-station parallel image test according to the present invention;
fig. 5 is a schematic diagram of the latch and the logical operation established by the redundant data transmission channel of the redundancy switching method for the multi-station parallel image test according to the present invention;
fig. 6 is a schematic structural diagram of a task update unit in an initial state of an image testing system according to a redundant switching method for multi-station parallel image testing of the present invention;
fig. 7 is a schematic diagram illustrating a first state parameter item corresponding to a working data transmission channel where a working iPC marked as a failure state is located in the multi-station parallel image testing redundancy switching method of the present invention is transferred to a task cache list;
fig. 8 is a schematic diagram of a first state parameter item corresponding to a working data transmission channel in which a failure is replaced by a redundant data transmission channel constructed according to the redundancy switching method for multi-station parallel image testing of the present invention;
fig. 9 is a schematic diagram illustrating that a first state parameter item corresponding to a working data transmission channel corresponding to a recovered normal working iPC is moved back to a task update list or a new first state parameter item is constructed according to the redundant switching method for multi-station parallel image testing of the present invention;
fig. 10 is a schematic structural diagram of a data cache module 201 of a redundancy switching method for multi-station parallel image testing according to the present invention;
fig. 11 is a process of generating a data integrity request message and receiving a response message by a data cache module according to the redundancy switching method for multi-station parallel image testing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The technical scheme of the invention is realized as follows: as shown in fig. 2 to fig. 9, the present invention provides a redundancy switching method for multi-station parallel image testing, which includes the following steps:
s1: establishing an image test system comprising a task issuing unit 100, a plurality of channel matching units 200, a redundancy switching unit 300, a task updating unit 400, N working iPCs and M redundancy iPCs; n and M are positive integers;
the task issuing unit 100 is configured to establish N parallel image test tasks and initialize each channel matching unit 200;
each channel matching unit 200 is configured to obtain an output processing request of the image capture card at the front end of each working iPC, attempt to connect with the corresponding working iPC, and construct a working data transmission channel; the channel matching unit 200 shown in the figure has two sets of output interfaces, but is not limited to two output ports, and may be a plurality of output ports;
the redundancy switching unit 300 is configured to connect the redundancy iPC with the channel matching unit 200 when one or more working data transmission channels fail, construct and input a redundancy data transmission channel;
the task updating unit 400 obtains the status information of the working data transmission channel established by the channel matching unit 200 or the redundant data transmission channel established by the redundant switching unit 300.
S2: issuing a parallel image test task; establishing a parallel image test task by the task issuing unit 100 until the upper limit of the parallel image test task is reached; and respectively enable each of the channel matching units 200, an image capture card at the front end of the channel matching unit 200, a working iPC at the rear end of the channel matching unit 200, and a redundancy switching unit 300.
S3: constructing a working data transmission channel; the task issuing unit 100 enables the first output end of each channel matching unit 200, so that the first output end is correspondingly in communication connection with the input end of a working iPC, and a working data transmission channel of the working iPC, which is the first output end of the channel matching unit 200, is formed; the task update unit 400 acquires the state parameters of each device port of the working data transmission channel;
specifically, the channel matching unit 200 is in a normal working state, the channel matching unit 200 further obtains differential signals of a first output end of the channel matching unit 200 and an input end of a working iPC, respectively, and performs latch and logic operation on the obtained differential signals, if an output result of the latch and logic operation is 1, it indicates that the working data transmission channel is successfully established, and the channel matching unit 200 feeds back a result of the successful establishment of the working data transmission channel to the task updating unit 400; if the output result of the latch and logic operation is 0, the logic operation is tried again until the maximum retry number is reached or the set termination time is reached, if no effective output result exists all the time, the result that the working data transmission channel is not successfully established is fed back to the task updating unit 400, and the task updating unit 400 marks that the current working iPC is in fault. As shown in fig. 3 and fig. 6, if all working ipcs can smoothly construct working data transmission channels, N independent working data transmission channels should be provided.
The process of latching and logic operation here is shown in fig. 4. If the first output end of the channel matching unit 200 or the input end of a working iPC is detected to have an effective differential signal, if the voltage peak-to-peak value between two differential ports forming a port exceeds 350mV, the differential signal is considered to be qualified, and a true value 1 is output through and gate operation, which indicates that a working data transmission channel is successfully established; if the first output terminal of the channel matching unit 200 or the input terminal of a working iPC cannot acquire a qualified differential signal, the and gate outputs a true value 0, which indicates that the working data transmission channel is not successfully established.
S4: fault redundancy switching; when a working iPC of a certain working data transmission channel fails, a second output end of the channel matching unit 200 corresponding to the failed working iPC is enabled, and the task issuing unit 100 enables a redundant iPC; the input end of the redundant switching unit 300 is in communication connection with the second output end of the channel matching unit 200, and the output end of the redundant switching unit 300 is in communication connection with the input end of the redundant iPC, so that a redundant data transmission channel from the second output end of the channel matching unit 200 to the redundant switching unit 300 to the redundant iPC is formed; the task update unit 400 collects the status parameters of each device port of the redundant data transmission channel;
specifically, the channel matching unit 200 and the redundancy switching unit 300 are in a normal working state, differential signals of the second output end of the channel matching unit 200, the input end and the output end of the redundancy switching unit 300 and the input end of the redundancy iPC are respectively obtained, the obtained differential signals are respectively latched and logically operated, if the output result of the latching and logical operation is 1, it indicates that the redundant data transmission channel is successfully established, and the channel matching unit 200 feeds back the result of the successful establishment of the working data transmission channel to the task updating unit 400; if the output result of the latch and logic operation is 0, the logic operation is tried again until the maximum retry number is reached or the set termination time is reached, if no valid output result exists all the time, the result that the redundant data transmission channel is not successfully established is fed back to the task updating unit 400, the task updating unit 400 marks that the current redundant iPC is failed, the task issuing unit 100 enables another redundant iPC, and the process is carried out again until the redundant data transmission channel is successfully established.
The process of latching and logic operation here is shown in fig. 5, if it is detected that the second output terminal of the channel matching unit 200, the input terminal and the output terminal of the redundancy switching unit 300, and the input terminal of the redundancy iPC all have effective differential signals, a true value 1 is output through and gate operation, which indicates that the redundancy data transmission channel is successfully established; if it is detected that any one of the second output terminal of the channel matching unit 200, the input terminal and the output terminal of the redundancy switching unit 300, or the input terminal of the redundancy iPC cannot obtain an effective differential signal, a true value 0 is output through an and gate operation, which indicates that the redundancy data transmission channel cannot be successfully established.
As a preferred embodiment of the method, the differential signal in steps S3 and S4 is an operating clock differential signal. Of course, a differential data transmission signal is also possible.
The task update unit 400 mentioned in the above steps, as shown in fig. 6 to fig. 9, includes a task update list and a task cache list; on one hand, the task update unit 400 establishes a task update list including a plurality of first state parameter items according to the state parameters of the device ports of the working data transmission channel, and periodically confirms the validity of each content of each first state parameter item in the task update list according to an update period T1; on the other hand, the task update unit 400 collects status parameters of each device port of the redundant data transmission channel, establishes one or more second status parameter items in the task update list, and periodically confirms the validity of each content of the second status parameter items according to an update period T2, where T2 may be the same as or different from T1; transferring a first state parameter item corresponding to the working iPC marked as the fault state and a second state parameter item corresponding to the redundant iPC marked as the fault state from the task updating list to the task cache list; the total number of the first state parameter items and the second state parameter items in the task update list is not more than N, namely the total number of the storage spaces corresponding to the task update list is N; and the total number of the first state parameter items or the second state parameter items in the task cache list does not exceed M, namely the total number of the storage spaces corresponding to the task cache list is M. In the initial state, each working iPC is in a normal state, no redundant data transmission channel is established, and the storage space corresponding to the task cache list is not occupied.
The first state parameter item specifically comprises a port address of a first output end of the channel matching unit 200 forming the working data transmission channel, a port address of an input end of the working iPC, a port mapping relation between the first output end of the channel matching unit 200 and the input end of the working iPC, and the remaining survival time of the working data transmission channel; the task update unit 400 periodically confirms whether the content of each first state parameter item in the task update list is valid or not according to a period T1, and automatically increases T1+ Δ T1 by the remaining survival time of the working data transmission channel of the confirmed normal first state parameter item; Δ T1 is a necessary delay for the task update unit 400 to confirm the current first state parameter item, and Δ T1 is smaller than T1; if no normal first state parameter item is confirmed in K continuous updating periods T1, moving the first state parameter item from the task updating list into the task cache list; k is less than N;
the second state parameter items specifically include port addresses of the second output end of the channel matching unit 200 constituting the redundant data transmission channel, port addresses of the input end and the output end of the redundant switching unit 300, port addresses of the input end of the redundant iPC, a port mapping relationship between the second output end of the channel matching unit 200 and the input end of the redundant switching unit 300, a port mapping relationship between the output end of the redundant switching unit 300 and the input end of the redundant iPC, and remaining survival time of the redundant data transmission channel, the task updating unit 400 periodically determines whether the content of each second state parameter item in the task updating list is legal and valid according to a period T2, the remaining survival time of the redundant data transmission channel of the normal second state parameter item is automatically increased by T2+ Δ T2, Δ T1 is necessary delay for the task updating unit 400 to determine the current second state parameter item, and Δ T2 is smaller than T2; and after the first state parameter item or the second state parameter item is removed from the task update list, the corresponding storage space in the task update list is released so as to vacate the storage space and insert the second state parameter item corresponding to the redundant data transmission channel.
S5: removing redundancy; when the working iPC marked as the fault state is recovered to normal, disconnecting the redundant data transmission channel for replacing the working data transmission channel corresponding to the working iPC, recovering the original working data transmission channel, or establishing a new working data transmission channel with another channel matching unit 200;
judging that the working iPC is recovered to be normal, specifically, confirming port state parameters of each device of a working data transmission channel where the working iPC with the fault is located by the task updating unit 400 by adopting a non-fixed period T3, determining that the working iPC with the fault is recovered to be normal after reaching a specified qualified number of times or accumulating normal working time, disconnecting a redundant data transmission channel of the working iPC with the fault state replaced on the same day before the next updating period T1, moving a second state parameter item corresponding to the redundant iPC out of a task updating list, and simultaneously moving a first state parameter item corresponding to the working data transmission channel corresponding to the working iPC with the normal recovery back to the task updating list to recover the connection state of the working data transmission channel; or when the first output end of the channel matching unit 200 corresponding to the original working data transmission channel is occupied, a new working data transmission channel is constructed by the recovered normal working iPC and the other normal working channel matching unit 200.
The task update unit 400 determines the port state parameters of the devices of the working data transmission channel where the failed working iPC is located by using the unfixed period T3, and if the specified pass time or the accumulated normal working time is reached, the pass time is N = a ([ N/10 ])]+ 1), square brackets are rounding operation, A is an adjustment coefficient, and the value of A is a positive real number; or let the accumulated time be
，i=1，2，3，…，m，iAnd the number of times of continuously confirming the port state parameters of each device of the working data transmission channel where the failed working iPC is located is accumulated by adopting an unfixed period T3.
The following provides a specific embodiment, and a description is given to the implementation process of the present solution.
An image testing system is constructed according to fig. 3, and the image testing system includes a plurality of subsystems, each subsystem includes a task issuing unit 100, 8 channel matching units 200, a redundancy switching unit 300, a task updating unit 400, 8 working ipcs, and 1 redundant iPC, that is, in this embodiment, N =8, m =1, and there are 9 ipcs in total. The number of channel matching units 200 is equal to the number of working ipcs. The maximum storage space of the task update list of the corresponding task update unit 400 is 8, and the maximum storage space may store the first state parameter items corresponding to 8 parallel working data transmission channels or the second state parameter items corresponding to redundant data transmission channels, and the task cache list of the task update unit 400 has only one storage space. Each subsystem can be used as a minimum execution unit of the image test system to carry out block splitting. If the image test system adopting four subsystems is adopted, 32 working iPCs and 1 redundant iPC are provided, but each subsystem can work independently, and the subsystem can improve the response speed.
In one embodiment, each channel matching unit 200 is simply understood to be a single-input dual-output 1:2 a signal selector as a switching circuit for the signal going-to-going part of the image capture card. The input end of each channel matching unit 200 is in communication connection with the output end of an image capture card, the first output end of each channel matching unit 200 is in communication connection with the input end of a working iPC, and the second output end of each channel matching unit 200 is in communication connection with one input end of the redundancy switching unit 300, so that the redundancy switching unit 300 has eight input ends and one output end, that is, a signal selector of 8. When each working iPC works normally, the eight input ends, one output end and the redundant iPCs of the redundant switching unit 300 are all in an idle state. Once the task updating unit 400 detects that any working iPC is abnormal, the working data transmission channel where the working iPC is located is disconnected, that is, the first output end of the channel matching unit 200 communicates with the input end of the working iPC which has a fault, the second output end of the channel matching unit 200 is switched to be in communication connection with one input end of the redundancy switching unit 300, and the output end of the redundancy switching unit 300 is in communication connection with the input end of the redundancy iPC, so that a redundancy data transmission channel which replaces the working data transmission channel where the working iPC which has a fault is located is constructed. And ensuring that the total number of the data transmission tasks to be tested is kept unchanged.
Since only one redundant iPC is provided, after any one working data transmission channel is abnormal, the redundant iPC cannot be provided with more redundant data transmission channels, and therefore, warning information needs to be sent to the task updating unit 400 in time to repair the failed working iPC as soon as possible, and the function of redundancy fault tolerance is realized.
In this embodiment, the transmission medium connecting different ports may be an RS485 cable, a USB3.0 cable, or other high-speed cables, taking a pin of USB3.0 typeA as an example, and pins 1-4 of USB3.0 typeA are ports compatible with USB 2.0; the first output terminal of the channel matching unit 200 and the working data transmission channel of the working iPC can be established by obtaining the differential clock signals, and a true value is output to judge whether the working data transmission channel can effectively transmit data, the channel matching unit 200 plays a role of a switch here, if the working data transmission channel cannot be established effectively, the first output terminal of the channel matching unit 200 and the working data transmission channel of the working iPC are disconnected, and the second output terminal of the channel matching unit 200 can automatically make the redundancy data transmission channel and the redundancy iPC establish a redundancy transmission channel without an additional redundancy line switching process through a special switching device 300.
The common redundancy system has the advantages that multiple complete and same software and hardware are synchronously executed, so that the data integrity is better, and the problem of data integrity cannot occur during redundancy switching; or pure hardware redundancy, without the need to handle the integrity of the data. The CIS test of the scheme only has iPC hardware redundancy, but has the requirement of maintaining the integrity of test data, so that the data integrity needs to be verified, and the problems of data loss caused by instability of a working data transmission channel or a redundant data transmission channel and redundant switching of the data transmission channel are avoided.
As shown in fig. 10 and fig. 11, as a preferred embodiment of this solution, in order to continuously verify the reliability of the working data transmission channel or the redundant data transmission channel and ensure that the CIS test data is complete and not lost, the channel matching unit 200 of this solution further includes a data caching module 201, where the data caching module 201 is configured to cache the test data of the CIS under test acquired by the image capture card at the front end of the current channel matching unit 200, and periodically send a data integrity request message for the last sent CIS test data to the working iPC or the redundant iPC corresponding to the working data transmission channel or the redundant data transmission channel established by the current channel matching unit 200, and after the data integrity request message is received by the working iPC or the redundant iPC, the data integrity request message checks the content of the message, changes the value of the field in the last CIS test data integrity request message, and returns the data integrity request message to the data caching module 201, and after the data caching module verifies the integrity of the last sent CIS test data, sends the cached next CIS test data adjacent to the last sent CIS test data, and sends the CIS test data to the working iPC or the redundant iPC corresponding to the redundant iPC. The interface quantity of the scheme is certain, the image acquisition card continuously acquires the test data of the CIS, if the established working data transmission channel or the redundancy data transmission channel is unstable or the data loss condition is unacceptable, the potential hazard of the product quality can be brought, and the detection yield of the corresponding channel of the image can be automatically continuously transmitted even if the network is interrupted, so that the working data transmission channel or the redundancy data transmission channel is ensured to be effective and reliable all the time, and the requirement is very high.
Specifically, a test data buffer is built in the data cache module 201, and is used for continuously storing a plurality of CIS test data to be tested one after another, and sending the CIS test data to a working iPC or a redundant iPC corresponding to a working data transmission channel or a redundant data transmission channel built in the current channel matching unit 200 one by one in a first-in first-out manner. Each time the last CIS test data to be tested is sent, the data cache module 201 does not send the next CIS test data immediately, but establishes a verification process of data integrity. The CIS test data comprises a plurality of CIS sub-item test contents which are sequentially carried out, a data integrity request message constructed by the data cache module 201 comprises a starting mark, a timestamp mark, a plurality of data verification sections and an ending mark, each data verification section corresponds to a plurality of discontinuous and non-repetitive segment information of one item of data of each CIS test, and separators are arranged between adjacent segment information in the data integrity request message; reserved verification fields are arranged between the adjacent data verification sections and between the data verification sections and the end mark. When the working iPC or the redundant iPC receives the data integrity request message: 1) Confirming that the request is a confirmation request of data integrity through the starting mark; 2) Then the working iPC or the redundant iPC compares the content of each subentry test of the last CIS test data which is just received with each data verification section, the content of the verification field reserved at the tail end of the data verification section is rewritten into 1, otherwise, the content is rewritten into 0, and the comparison of the segments and the rewriting of the content of the reserved verification field are sequentially completed by all subentry test content of each subentry test of the last CIS test data; 3) The end mark indicates the end of the message; 4) The working iPC or the redundant iPC confirms the time of message transmission and the current universal time through the timestamp mark, and after the verification of each sub-item test content is completed, the content of the timestamp mark is replaced by the current time of the confirmation; the initial mark is replaced by the timestamp mark of the current time, and the plurality of data verification sections and the end mark with the contents of the reserved verification fields rewritten are re-encapsulated into a response message and sent to the data cache module 201, after the data cache module 201 receives the response message, the contents repeated with the data integrity request message, namely the initial mark, the plurality of data verification sections and the end mark, are removed, and only the number of the contents with the contents rewritten to 1 of the verification fields reserved at the tail of the data verification sections is counted, so that the integrity of the last CIS test data sent by the data cache module 201 to the working iPC or the redundant iPC can be judged. When the data caching module 201 confirms the integrity of the last CIS test data received by the working iPC or the redundant iPC according to the content of the response message, the last CIS test data stored in the data caching module 201 is cleared, the sending of the next CIS test data adjacent to the last CIS test data is started, and the above process is repeated. The plurality of discontinuous and non-repeating segment information of one data of each CIS test may be more than two, such as a head and a tail of one data of each CIS test, or a head, a middle or a tail of one data of each CIS test.
If the integrity of the data does not meet the requirement, it indicates that the data may have the phenomena of data loss and transmission error, or temporary interruption of a working data transmission channel or a redundant data transmission channel, and the like, the data cache module 201 will resend the last CIS test data, and add 1 to the retry attempt count in the unit period of the corresponding working iPC or redundant iPC, repeat the above data verification process, retry can be attempted for multiple times, but the following condition 1) needs to be satisfied simultaneously, and the cumulative retry number reaches n times, n is less than or equal to m; 2) The cumulative time of the multiple attempts must not exceed the remaining survival time of the working data transmission channel + T1+ Δ T1 or the remaining survival time of the redundant data transmission channel + T2+ Δ T2; it indicates that the current working data transmission channel or the redundant data transmission channel is not trusted, and the redundant iPC needs to be replaced to reconstruct a new redundant data transmission channel. And repeating the process of sending and verifying the last CIS test data to be tested after a new redundant data transmission channel is constructed.
Certainly, the working iPC or the redundant iPC compares the content of each sub-test of the last CIS test data just completed receiving with each data verification section, and completely matches, after the content of the verification field reserved at the end of the data verification section is rewritten, it is also possible to further replace a plurality of discontinuous and nonrepeating segment information of the data verification section in the received data integrity request message, for example, replace the received new segment information which is discontinuous, nonrepeating, and equivalent to the original segment information and obtained by shifting the start position of each segment information of the last CIS test data to a certain byte or shifting the end position of each segment information to a certain byte, so as to implement secondary data segment verification, that is, after the content of the response message containing the new segment information is received, the data caching module 201 comprehensively evaluates the reliability of the current working data transmission channel or the data transmission channel by combining the number of the content rewritten at the end of the verification field to 1. If the number of the verification fields which are reserved at the end of the verification section and meet the requirement of secondary data segment verification is met, the current working data transmission channel or the redundancy data transmission channel can be considered to be reliable, otherwise, the current working data transmission channel or the redundancy data transmission channel is considered to be unreliable.
Whether the verification process is passed or not, the data buffer module 201 continuously receives the test data of the CIS under test acquired by the image capture card at the front end of the channel matching unit 200 and puts the test data into the end of the data buffer area.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. A redundancy switching method for multi-station parallel image testing is characterized by comprising the following steps:
s1: establishing an image test system comprising a task issuing unit (100), a plurality of channel matching units (200), a redundancy switching unit (300), a task updating unit (400), N working iPCs and M redundancy iPCs; n and M are positive integers;
s2: issuing a parallel image test task; establishing a parallel image test task by the task issuing unit (100) until the upper limit of the parallel image test task is reached; and respectively enabling each of the channel matching units (200), the image capture card at the front end of the channel matching unit (200), the working iPC at the rear end of the channel matching unit (200), and the redundancy switching unit (300);
s3: constructing a working data transmission channel; the task issuing unit (100) enables the first output end of each channel matching unit (200) to be correspondingly connected with the input end of a working iPC in a communication mode, and a first output end-working iPC working data transmission channel of the channel matching unit (200) is formed; the task updating unit (400) collects the state parameters of each equipment port of the working data transmission channel;
s4: fault redundancy switching; when a working iPC of a certain working data transmission channel fails, a second output end of a channel matching unit (200) corresponding to the failed working iPC is enabled, and a redundant iPC is enabled by a task issuing unit (100); the input end of the redundancy switching unit (300) is in communication connection with the second output end of the channel matching unit (200), and the output end of the redundancy switching unit (300) is in communication connection with the input end of the redundancy iPC to form a redundancy data transmission channel of the second output end of the channel matching unit (200), the redundancy switching unit (300) and the redundancy iPC; the task updating unit (400) collects the state parameters of each equipment port of the redundant data transmission channel;
s5: removing redundancy; when the working iPC marked as the fault state is recovered to normal, the redundant data transmission channel replacing the working data transmission channel corresponding to the working iPC is disconnected, the original working data transmission channel is recovered, or a new working data transmission channel is established with another channel matching unit (200).
2. The method according to claim 1, wherein the step S3 of forming the working data transmission channel between the first output terminal of the channel matching unit (200) and the working iPC makes the channel matching unit (200) in a normal working state, the channel matching unit (200) further obtains the differential signals between the first output terminal of the channel matching unit (200) and the input terminal of the working iPC, and performs latch and logic operation on the obtained differential signals, if the output result of the latch and logic operation is 1, it indicates that the working data transmission channel is successfully established, and the channel matching unit (200) feeds back the result of the successful establishment of the working data transmission channel to the task updating unit (400); if the output result of the latch and logic operation is 0, the logic operation is tried again until the maximum retry number is reached or the set termination time is reached, if no effective output result exists all the time, the result that the working data transmission channel is not successfully established is fed back to the task updating unit (400), and the task updating unit (400) marks that the current working iPC is in failure.
3. The redundant switching method of the multistation parallel image test according to claim 2, characterized in that the step S4 of forming the redundant data transmission channel of the second output end-redundant switching unit (300) -redundant iPC of the channel matching unit (200) is to make the channel matching unit (200) and the redundant switching unit (300) in a normal working state, respectively obtain the differential signals of the second output end of the channel matching unit (200), the input end and the output end of the redundant switching unit (300) and the input end of the redundant iPC, respectively latch and logically operate the obtained differential signals, if the output result of the latch and logical operation is 1, it indicates that the redundant data transmission channel is successfully established, and the channel matching unit (200) feeds back the result of the successful establishment of the working data transmission channel to the task updating unit (400); if the output result of the latch and logic operation is 0, the logic operation is tried again until the maximum retry number is reached or the set termination time is reached, if no effective output result exists all the time, the result that the redundant data transmission channel is not successfully established is fed back to the task updating unit (400), the task updating unit (400) marks that the current redundant iPC is failed, the task issuing unit (100) enables another redundant iPC, and the steps are carried out again until the redundant data transmission channel is successfully established.
4. The redundant switching method of the multi-station parallel image test according to any one of claims 2 or 3, wherein the latching and logic operation is a sampling and AND gate operation of a differential signal obtained from a differential signal between a first output terminal of the channel matching unit (200) and an input terminal of a working iPC, or a sampling and AND gate operation of a differential signal obtained from a second output terminal of the channel matching unit (200), an input terminal and an output terminal of the redundant switching unit (300) and an input terminal of a redundant iPC.
5. The method according to claim 4, wherein the differential signals are working clock differential signals.
6. The redundancy switching method of the multi-station parallel image test according to claim 3, wherein the task update unit (400) comprises a task update list and a task cache list; on one hand, the task updating unit (400) establishes a task updating list comprising a plurality of first state parameter items according to the state parameters of each equipment port of the working data transmission channel, and periodically confirms the validity of each item of the first state parameter items in the task updating list according to an updating period T1; on the other hand, the task updating unit (400) collects the state parameters of each equipment port of the redundant data transmission channel, correspondingly establishes one or more second state parameter items in the task updating list, and periodically confirms the validity of each content of the second state parameter items according to the updating period T2; transferring a first state parameter item corresponding to the working iPC marked as the fault state and a second state parameter item corresponding to the redundant iPC marked as the fault state from the task updating list to the task cache list; the total number of the first state parameter items and the second state parameter items in the task updating list is not more than N; and the total number of the first state parameter items or the second state parameter items in the task cache list does not exceed M.
7. The redundancy switching method of the multi-station parallel image test according to claim 6, wherein the first status parameter item includes a port address of a first output end of a channel matching unit (200) constituting a working data transmission channel, a port address of an input end of a working iPC, a port mapping relationship between the first output end of the channel matching unit (200) and the input end of the working iPC, and a remaining survival time of the working data transmission channel; the task updating unit (400) regularly confirms whether the content of each first state parameter item in the task updating list is legal and valid according to a period T1, and the residual survival time of the working data transmission channel of the confirmed normal first state parameter item is automatically increased by T1+ delta T1; Δ T1 is a necessary delay of the task updating unit (400) for confirming the current first state parameter item, and Δ T1 is smaller than T1; the method comprises the steps that a first state parameter item which is not confirmed to be normal in K continuous updating periods T1 is moved into a task cache list from a task updating list; k is less than N;
the second state parameter items comprise port addresses of second output ends of channel matching units (200) forming the redundant data transmission channels, port addresses of input ends and output ends of redundant switching units (300), port addresses of input ends of redundant iPC, port mapping relations between the second output ends of the channel matching units (200) and input ends of the redundant switching units (300), port mapping relations between output ends of the redundant switching units (300) and input ends of the redundant iPC and residual survival time of the redundant data transmission channels, the task updating unit (400) periodically confirms whether contents of the second state parameter items in the task updating list are legal and effective according to a period T2, T2+ Deltat 2 is automatically increased by the residual survival time of the redundant data transmission channels of the confirmed normal second state parameter items, deltat 1 is necessary delay of the task updating unit (400) for confirming the current second state parameter items, and Deltat 2 is smaller than T2; and in the continuous K updating periods T2, the normal second state parameter item is not confirmed, and the second state parameter item is moved from the task updating list into the task cache list.
8. The redundancy switching method of the multi-station parallel image test according to claim 6, characterized in that, the working iPC marked as the failure state in step S5 is recovered to normal, the task update unit (400) adopts an unfixed period T3 to confirm the port state parameters of each device of the working data transmission channel where the working iPC with the failure is located, after reaching the specified qualified times or after accumulating the normal working time, the working iPC with the failure is determined to be recovered to normal, before the next update period T1, the redundant data transmission channel replacing the working iPC with the failure state on the same day is disconnected, the second state parameter item corresponding to the redundant iPC is moved out of the task update list, and simultaneously, the first state parameter item corresponding to the working data transmission channel corresponding to the working iPC with the normal recovery is moved back to the connection state of the working data transmission channel; or when the first output end of the channel matching unit (200) corresponding to the original working data transmission channel is occupied, a new working data transmission channel is constructed by the recovered normal working iPC and another normal working channel matching unit (200).
9. The method according to claim 8, wherein the task update unit (400) determines the port state parameters of the devices of the working data transmission channel where the failed working iPC is located by using the unfixed period T3, and the qualified number is N = A ([ N/10 ]) when the specified qualified number or the accumulated normal working time is reached]+ 1), square brackets are rounding operations, and A is an adjustment coefficient; or let the cumulative time be
，i=1，2，3，…，m，iThe port state of each device of the working data transmission channel of the working iPC with the fault is accumulated by adopting an unfixed period T3The number of times the parameter is continuously confirmed.
10. The redundancy switching method of the multi-station parallel image test according to claim 1, wherein the channel matching unit (200) further includes a data caching module (201), the data caching module (201) is configured to cache the test data of the CIS under test obtained by the image acquisition card at the front end of the current channel matching unit (200), and periodically send a data integrity request message for the test data of the CIS sent last time to a working iPC or a redundant iPC corresponding to a working data transmission channel or a redundant data transmission channel established by the current channel matching unit (200), after the data integrity request message is received by the working iPC or the redundant iPC, the content of the message is checked, the value of a field in the integrity request message of the CIS test data sent last time is changed, and the data integrity request message is returned to the data caching module (201) again, after the data caching module (201) verifies the integrity of the test data of the CIS sent last time, the next test data of the CIS cached last time adjacent to the test data sent last time is sent, and the redundancy switching method is sent to the corresponding working iPC or the redundant iPC.
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