SU1297060A1 - Device for checking logic circuits - Google Patents

Abstract

The invention relates to computing and can be used to monitor and diagnose integrated logic chips and devices based on them. The purpose of the invention is to increase speed. The device allows to control complex logic circuits without developing special tests for the minimum time. It contains a generator of setpoint effects, the first frequency divider 2, the second frequency divider 3, the controlled circuit 4, the reference logic 5, the first 6 and second 7 current sensors, the first 8 and second 9 low-pass filters, the subtraction unit 10, the threshold element 11 , spectrum analyzer 12, analog-to-digital converter 13, comparison circuit 14, fixed memory unit 15, counter 16 and display unit 17. In addition, the device allows determining the nature of the fault with accuracy to the component. 1 il. O) / 7 E: o

Description

The invention relates to automation and computing and can be used to monitor and diagnose integrated logic chips and devices based on them.

The aim of the invention is to increase speed.

The drawing shows a block diagram of the device.

The device contains a generator of setpoint effects, the first frequency divider 2, the second frequency divider 3, the controlled circuit 4, the reference circuit 5, the first 6 and second 7 current sensors, the first 8 and second 9 low-pass filters, subtraction unit 10, threshold element 11, spectrum analyzer 12, analog-digital

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the signal that permits the operation of the counter 16, the second input of which is connected to the generator 1 of the setting influences. At the same time, the counter begins to convert the pulse signal into a binary sequence arriving at the address inputs of block 15. Information about possible malfunctions of the monitored circuit is extracted from block 15, and the word length is such that the first half of it contains information about a possible malfunction, and the second trouble code.

necessary for indicating the results in the display unit 17. If the data; stored in unit 15 coincides with the data removed from the ADC 13, the comparison circuit 14 produces a signal that blocks the operation of the generator 1 transducer (ADC) 13, compare giving influences. In this case, the block 14, the block 15 of the permanent memory, 17 the display indicates the nature of the counter 16 and the block 17 of the display.

The device works as follows.

Generator 1 generates a high-frequency pulse signal, which is converted by the first frequency divider into a plurality of non-multiple frequency signals. Each of these signals is fed to the corresponding input of the monitored circuit 4 and the reference circuit 5. The first 6 and second 7 current sensors produce signals whose law changes correspond to changes in the current in the circuits of the controlled and reference logic circuits, respectively. The first 8 and second 9 low-pass filters filter the signals to eliminate high-frequency impulse noise. The subtraction unit 10 determines the difference between the signals taken from the current sensors. The resulting difference in signal values is fed to the inputs of threshold element 11 and spectrum analyzer 12. When the error value exceeds a certain value set in advance as a threshold threshold, a logical signal appears at the output of the latter characterizing the presence of a fault in circuit 4. This signal the threshold element 11 is the trigger signal for the ADC 13, the inputs of which are connected to the outputs of the spectrum analyzer 12. Upon completion of the conversion, the ADC 13 produces

the signal that permits the operation of the counter 16, the second input of which is connected to the generator 1 of the setting influences. At the same time, the counter begins to convert the pulse signal into a binary sequence arriving at the address inputs of block 15. Information about possible malfunctions of the monitored circuit is extracted from block 15, and the word length is such that the first half of it contains information about a possible malfunction, and the second trouble code.

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thirty

serviceability. If, however, the cycle time, which is set as the division factor of the 3 frequency divider, is not in the display unit. the data on the nature of the malfunction comes in, i.e., the threshold element, the ADC, the counter and the block 15 do not work, then the second frequency divider 3 generates a signal to be sent to block 17,

veins.

formula of invention

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A device for monitoring logic circuits containing a generator of overvoltage influences, a first frequency divider, a spectrum analyzer, a comparison circuit, a reference circuit, an indicator unit, the first output of the master oscillator of actions acting on the input of the first frequency divider, the first output of which is connected to the input of the reference oscillator. circuit and is an information output of the device for connection to the input of the controlled circuit, characterized in that, in order to increase the speed of the device, a second frequency divider is inserted into it, sensor, two current sensors, two low-pass filters, a subtraction unit, a threshold element, an analog-to-digital converter and a permanent memory unit, with the inputs of the first and second current sensors connected to the reference circuit and information input of the device, respectively, for connecting to the output circuits, outputs of the first and second current sensors

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312970604

through the corresponding filters of the lower fault codes of which the sub-frequencies are connected to the corresponding to the first input of the display unit, the inputs of the subtraction unit, the output of the spacing-second input of which is connected to the output of which is connected to the inputs of the pso-path of the second frequency divider - which is connected to the second output of the ra, the output of which is connected to the information-first frequency divider, the output to the analog-digitization analogue of the comparison circuit is connected to the converter, the start input of which blocking the generator of the driver is connected to the output of the threshold effects, the second output of which element, the information output ana-) 0 is connected to the counting input of the digital-to-digital converter, connected to the first input of the comparison circuit, With the output of the conversion end, the second input of which is connected to the output analog-digital converter, the house of information about possible malfunction - the output of the counter is connected to the address address of the fixed memory unit, the output to the 15th input of the fixed memory unit.

Claims (1)

Claim A device for controlling logic circuits, comprising a generator of 55 driving actions, a first frequency divider, a spectrum analyzer, a comparison circuit, a reference circuit, an indication unit, the first output of the driving generator being connected to the input of the first frequency divider, the first output of which is connected to the input of the reference circuit and It is the information output of the device for connecting to the input of the controlled circuit, characterized in that, in order to increase the speed of the device, a second frequency divider, counters, are introduced into it , two current sensors, two lower hour filters, one subtraction unit, a threshold element, an analog-to-digital converter and a permanent memory unit, the inputs of the first and second current sensors being connected respectively to the output of the reference circuit and the information input of the device for connecting to the output of the monitored circuit , the outputs of the first and second current sensors through the corresponding low-pass filters are connected to the corresponding inputs of the subtraction unit, the difference output of which is connected to the inputs of the threshold element and the analyzer a device whose output is connected to the information input of an analog-to-digital converter, the start input of which is connected to the output of a threshold element, the information output of an analog-to-digital converter is connected to the first input of the comparison circuit, the second input of which is connected to the output of information about a possible malfunction of the constant memory, the output of which 15 trouble code is connected to the first input of the display unit, the second input of which is connected to the output of the second frequency divider, the input of which is connected to the second output a first frequency divider, output equality comparison circuit connected to the oscillator input zadayu- boiling blocking effects, the second output of which is connected to the counting input of a counter, whose enable input connected to the output end of the conversion analog-digital converter, the counter output is connected to the address input of the constant memory block.