SU1233156A2 - Device for checking digital units - Google Patents

Abstract

The invention relates to digital computing and can be used to test the health of digital devices using signature analysis principles. The aim of the invention is to increase reliability by providing non-contact tuning of the device for controlling arbitrary logic elements. The device comprises a test generator, a multiplexer, a switch of control signals, an active differential driver, a signature generator, and a signature comparison unit. In addition, the device comprises a control unit, an indication unit and a memory unit. A distinctive feature of the device is the presence of a combination of an active differential generator and a memory block, which makes it possible to carry out contactless switching in a certain way of selected active differences of control signals of arbitrary monitored blocks by signals from a memory block. 1 hp f-ly, 1 ill.

Description

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The invention relates to digital computing and can be used to verify the health of digital devices.

The purpose of the invention is to increase reliability by providing non-contact tuning of the device for controlling arbitrary logic elements,

The drawing shows a block diagram of the device.

The device contains a monitored digital block 1, a generator of 2 tests, a multiplexer 3 and a switch A of control signals, in series with KOTopblM are connected a driver 5 of the active differential, forms: level generator 6 signatures and block 7 comparison of signatures. In addition, it contains the control unit 8, the display unit 9 and the memory unit 10. Input 11 is the input of the initial setup of the device, output 12 is the output of the device malfunction, the driver of the active differential contains adders 13,, 13 and 13, modulo two.

The device works as follows.

At the predetermined inputs of block 1, stimulating signals are received. generator output 2 tests. In order to ensure the synchronization of the stimulating signals with the rest of the signals generated by block 1, a clock signal is sent from the latter to the generator 2 of the tests. In this case, at all outputs of block 1, connected to the inputs of multiplexer 3, certain binary sequences are developed.

In the first cycle of operation, at the information outputs of the control unit 8, a code is set corresponding to the first monitored parameter (the first of the monitored information outputs of the monitored unit 1 in conjunction with the corresponding control signals).

At the same time, the first channel is open on the multiplexer 3, and a signal is connected to the start, stop and synchronization inputs of the active differential generator 5, respectively. unit 1 related to the signal at the first checked output of the control object. Simultaneously from the information outputs of the memory block 10 to the inputs of the generator 5 of the active differential post

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It receives a three-bit parallel code defining the values of active differences required for the first monitored parameter of the start, stop and synchronization signals, for which the code corresponding to the first monitored parameter is supplied to the address inputs of memory 10 from the information outputs of control 8. Input Reading of memory block 10 is connected to the resolving potential bus.

After the end of the measurement interval, the crawled signature enters the second group of information inputs of the signature comparison unit 7 performed on. based storage device. The first group of inputs of the signature comparison unit 7 is connected to the output group of the parameter number of the control unit 8.

If the signature of the first parameter is correct, on. In device setup 12, a logical unit signal is inserted, the same signal is on the first output of signature comparison unit 7. In this case, at the outputs of the parameter number of the control block 8, a code is set corresponding to the next controlled parameter. In multiplexer 3 and control switch 4, the first channels are closed and the second channels are opened. The measurement cycle is repeated. If the signature of the second monitored parameter is correct, then in the same way the device proceeds to check the following; its parameter, etc.

If in the control process, the signature of one of the parameters is non-. correct, then at the output 12 of the device there is a zero potential, and on the display unit 9, the parameter code is displayed, which is classified as n @ equal.

The determination of the required active differences of the control signals for start, stop and synchronization is made in order to ensure stable values of the signatures at the stage of testing the monitoring device. For each monitored parameter, the values of the control codes that are stored in the memory block 10 are determined.

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Claims (2)

1. A device for controlling digital blocks, comprising a test generator, a multiplexer, a signal generator, and a control switch. Signal Comparison Unit, Control Unit and Display Unit, the output group of the parameter number of the control unit is connected to the control groups of the multiplexer and control switch inputs, the group of inputs of the display unit and the first group of information inputs of the signature comparison unit; with the installation inputs of the signature generator, the signature comparison unit and the control unit, the group of information outputs and the synchronous input of the test generator are connected continuously to the group of information inputs and the clock controlled by a digital unit, group of information outputs of which is connected with the group of information inputs of the multiplexer, the output of which is connected to data input of the signature outputs Start Stop and Synchro-controlled digital block are connected to the corresponding. Information inputs of the switch of control signals, the group of information outputs and the gate output of the signature generator connect respectively to the second group of information inputs and input 1564 the gating house of the signature comparison unit, the first information output of which is connected to the counting input of the control unit, and the second information output is the output of the device malfunction, which is characterized by  In order to increase reliability by providing a contactless adjustment of the device for controlling arbitrary logic elements, it contains the active differential driver and the memory block, with the Start, Stop, and Syncro 1F1 outputs of impassable signals through the active differential driver that are connected to the same inputs of the signature generator, the group of control inputs of the active differential generator is connected to the group of information outputs of the memory block, the group of address inputs of which is connected to the group of outputs in the parameter numbers of the control unit, and the input of the readout of the memory unit is connected to the bus of the device enabling potential. 2. The device according to claim 1, wherein the active differential driver contains three modulo-two adders, the first and second modulo-two adders of the modulator are respectively the information and control input groups of the imaging unit, and the output is the output generator group. Editor N. Rbgulich Compiler C, Starches: in Tehred O. Sopko; Proofreader. Shekmar Order 2772/51 Tnpaxfc 671 BNIIPI USSR State Committee for inventions and discoveries 113035 Moscow, Zh-35, Raugasls nab. 4/5 Manufacturing plant and printing company, Uzhgorod, st. Project, 4 Subscription