SU546888A1 - Device for controlling digital objects - Google Patents

Description

one

The invention relates to computing technology, in particular, to software-controlled means for monitoring and diagnosing the instability of complex digital objects. It can be used for functional testing of large integrated circuits, as well as for monitoring and troubleshooting various computing and automation devices built on integrated circuits.

A device for monitoring objects that contains a test generator, the outputs of which are connected to the inputs of the monitored reference objects, a comparison unit, the inputs of which are connected to the outputs of both objects, and a display unit associated with the outputs of the comparison unit are known. However, the known device excludes the use of only certain fixed sequences of signals, determined by the algorithm for generating pseudo-random numbers in the test generator, applied to the object. This circumstance narrows down the area of device data usage, since for many digital objects containing memory elements, before checking them for pseudo-random tests generated by the device, it is necessary to apply certain waveforms that can ensure the installation of memory elements of the monitored and reference objects in one initial state. Since the ethn sequences do not depend entirely on the features of the object's circuit, and for all the objects, in general, they are different, setting them with the aid of the test generator of the device is impossible. The unsuitability of the device under consideration for the programmable assignment of arbitrary sequences to the inputs of objects, as well as the lack of programming programming of the length and length of pseudo-random sequences generated makes this device unsuitable for monitoring objects on a preselected and tested (for example, using a computer through a test generator model, an object ) a set of random tests. It is also known a device comprising a program storage unit, connected via a interface unit to the inputs of the object to be monitored, an analysis unit associated with the object outputs and a predetermined program unit, and a display unit 1. This known device is characterized by the limited ability to control objects using pseudo-random tests. Since pseudo-random tests are in no way connected with the logical structure of the object being monitored, for complex objects their length can be very large (millions of cycles or more). With an acceptable amount of memory of the device setting unit of the device and its real-time performance, the software setting the test of such a length (with all its signal sets indicated) and the corresponding standard reactions turns out to be impossible. In connection: the ethn.m for many complex objects excludes the possibility of automated test synthesis using the most common in practice heuristic methods based on the analysis of the controlling properties of pseudo-random sequences using a computer. As a result, the time and other costs of creating tests necessary to inspect objects using a device of this type increase substantially, which reduces the effect of using the device and reduces its area of use. The closest to the invention to the technical nature is a device for monitoring digital objects, comprising a program storage unit, a control unit, an analysis unit and an indication unit, the control input of the analysis unit connected to the corresponding output of the control unit, the first information input - with the first output unit storage of the program, the first output with the corresponding input of the control unit, and the bulk output with the first input of the display unit, the second input of which is connected to the second input of the program storage unit, tert The output of which is connected to the corresponding input, and the input to the corresponding output of the control unit. This known device does not provide the possibility of effective control of objects with the help of long-term random tests, which significantly narrows the class of objects controlled by the device. Practically, this class includes only those objects for which tests can be built quite easily manually (objects with a regular structure, such as various transmitters, registers, etc.) and objects of small complexity, for which the length of pseudorandom nevelnka tests. The purpose of the invention is to extend the class of controlled objects. In the described device, this is achieved by additionally introducing a test generator, a interface unit and a comparison unit, the control inputs of the test generator, the interface unit and the comparison unit are connected to the corresponding outputs of the control unit, the output of the comparison unit is connected to the second information the input of the analysis unit, and the first and second inputs to the device inputs, the first and second outputs of the interface unit are connected to the device outputs, and the first and second information inputs to the generator output, respectively tests and with the fourth output of the program storage unit, the fifth output of which is connected to the information input of the test generator. The drawing shows the functional diagram of the device described and the designations accepted: 1 - test generator; 2 — interface block; 3-Controller 1 object; 4- reference object; 5 - block crawpenp; 6 - unit of analysis; 7-unit 1dikats1P; 8-block program storage; 9 - control unit. The operation of the device in the process of monitoring objects is determined by the program stored in block 8, which can be used as an input device with a punched tape, tip on a magnetic tape, permanent or operative storage device, etc. The system of commands implemented by the device allows programming the following operations: setting the synchronization sequence parameters of the monitored and reference objects (duration and number of pulses in the synchronization cycle, the magnitude of their relative shift in, etc.)..; setting a pseudo-random test by setting the required initial state of the sensor and the isad-random sequences included in test generator 1, specifying the length of the sequence and the algorithm of its formation; running test generator 1 in order to apply to objects 3 and 4 of the pseudo-random and sequence and synchronization sequence defined by the initial conditions indicated above; the application to objects 3 and 4 of the randomized ones indicated in the program and sequences of signals to bring the objects into the same initial state and any tests specified in the program; logical processing of the result — iaTOB comparing the values of any pairs of the same-named outputs of objects 3 and 4; conditional transitions (naimimer, iroiusk one team or group of commands in the program), depending on the results obtained in the processing operations, or directly from the comparison of the output pairs of objects 3 and 4 specified in the program; output through the display unit 7 data specified in the program or data from the analysis unit 6. The execution of a typical program of the functional control of an object is as follows. After the start of the program sample start, from block 8, using the appropriate commands and data received from this block, initial conditions are sent to test generator 1, determining the required pseudo-random test and synchronization sequence. Further, if the object being monitored contains memory elements, from block 8 it receives a sequence of commands and data with the help of which a sequence of initial installation of both objects is specified to the inputs of objects 3 and 4 through the matching module 2. After that, from block 8 a command is received to start test generator 1, which provides an application to objects 3 and 4 of a pseudo-random test, specified by the appropriate initial conditions. If the length of a given test is long enough (in principle, it can be millions of cycles or more), then at the time of its application the further selection of commands and programs from block 8 is automatically suspended.

In the process of applying the test to objects 3 and 4 in each of its cycles, block 5 compares the values of the signals at the same outputs of the objects. If, in any test cycle, an inequality in the values of at least one pair of such outputs is detected, the test generator 1 stops and the display unit 7 signals a malfunction of the controlled object. 6. After this, and also if the test reaches the end, the program is resumed from block 8, which either stops the monitoring process or sets up another pseudo-random test or test directly indicated in the program. In the latter case, the next run of the test generator 1 is not performed, and the sequence of input signal sets of objects 3 and 4 is specified via the interface block 2 directly with the help of commands and program data in the same way as in the case of the sequence of identifying objects 3 and 4 into the known initial state.

When diagnosing malfunctions of a monitored object 3, the operation of the device proceeds similarly with the only difference that the result of each test is recorded in the register of the display unit 7. In this case, a certain register register is assigned to each test, which is written "1 if the test detects a malfunction of the object 3, and “O - otherwise. After all the tests provided by the program have been executed, the malfunction code of object 3 is generated in the specified register. This code is indicated by block 7 and is then used to determine (manually) the coordinates of the faulty element according to a previously compiled diagnostic dictionary.

The ability to execute programmed operations for processing the results of comparing the reactions of objects 3 and 4 using the analysis block allows other diagnostic methods to be used. In particular, other methods of forming a DTC and various procedures for compressing its format can be applied. In addition, in cases where this is possible (for example, if the outputs of all the integrated circuits of objects 3 and 4 are connected using an appropriate contact device - an adapter to the inputs of the comparison block 5), diagnostics can be carried out by program analysis of the comparison results generated by block 5 , directly in the tact of the test in which the difference between the reactions of both objects was detected. Such an analysis allows to obtain

the result of diagnostics directly in the form of coordinates of a faulty integrated circuit, did not resort to the formation of a malfunction code and the subsequent non-automatic search for its coordinates using the diagnostic dictionary.

As can be seen from the above description, the introduction into the described device of a new test generator block, a comparator block and an interface block, as well as the corresponding links between them 1 between themselves and with the blocks such

as in the known devices, it allows effectively combining the pseudo-random tests generated by the hardware and the software-defined tests during the control of objects, to carry out high-speed verification of the objects

on pseudo-random tests of great length, including in those cases when the object's reference reactions to these tests are not known in advance. This significantly expands the class of controlled objects, and increases

accuracy and degree of automation of control.

Claims (1)

Invention Formula A device for monitoring digital objects containing a storage unit, a control unit, an analysis unit and an indication unit, the control input of the analysis unit being connected to the corresponding output of the control unit, information the input is with the first output of the program storage unit, the first output is with the corresponding input of the control unit, and the second output is with the first input of the display unit, the second input of which is connected to the second output of the program storage unit, the third output of which is connected to the corresponding input, and the input - with a corresponding output of b. 71A control, characterized in that, in order to expand the class of monitored objects, a test generator, an interface unit and a comparison unit are additionally introduced into the device, and the control inputs of the generator s, CIU and the comparator are connected to respective outputs of control unit, the comparator output coupled to the second data input of the analysis unit, and the first and second inputs - with the device inputs, first and second outputs and a block conjugated eni connected to the outputs of the device, and the first and second information inputs to the output of the test generator, respectively, and to the fourth output of the program storage unit, the fifth output of which is connected to the information input of the test generator.