SU548862A1 - Device for diagnosing faults in logic circuits - Google Patents

Description

one

The invention relates to the field of computer technology and can be used to monitor and detect faults in computer logic elements.

A device 1 for diagnosing malfunctions in logic circuits is known, comprising a diagnostic kit generation unit, a decoder, a control unit, a unit for fixing the results of the checks, first and second groups of transducers.

The disadvantages of the known device are its limited functionality due to the fact that it can localize only faults of the constant zero and constant unit type.

The closest to the invention in technical essence and the achieved result is a device 2 for troubleshooting diagosics in logic circuits, comprising a clock generator, a pulse counter, a syndrome calculator, a decoder, OR elements, fault counters and a fault identification block, output of the clock generator connected to the input of the imiuls counter, the outputs of the reference and diagnosed logic circuits are connected through the syndrome calculator to the inputs of the decoder, the outputs of which through the element Options OR connected to the fault counter inputs, input group and Indication

the outputs of the fault identification block are connected respectively to the outputs of the fault counters and the outputs of the device, and the inhibiting output of the fault identification block is connected to the input of the clock generator.

The disadvantage of the known device is that it does not allow to diagnose logic circuits of the “pulse-potential type”, which reduces the functional functions of the device.

The purpose of the invention is to expand the functionality of the device, namely

ensuring the possibility of diagnostics of malfunctions of logic circuits of a pulse-potential type.

The goal is achieved by the fact that the device contains a switch, elements

And an additional pulse generator, the first and second groups of inputs of the switch are connected respectively to the device input and to the output of an additional pulse generator, whose inputs are connected to the output of the clock generator and to the inhibit output of the fault identification block, the outputs of the pulse counter and the switch outputs are connected respectively to the first and second inputs of the elements And, and the output of each element

And connected to the corresponding input of the reference and verifiable logic circuits,

The block diagram of the device; - represented in the drawing.

A device for diagnostics of malfunctions in logic circuits contains a clock generator 1, a counter 2 impulses, a switch 3, elements AND 4, a reference logic 5, a test logic 6, a block 7 for calculating the syndrome, a decoder 8, elements OR 9, counters 10 faults, fault identification block 11, pulse generator 12.

In the drawing there are: 13 - prohibiting the output of the fault identification block, 14 - input of the device.

The device works as follows.

When diagnosing malfunctions of potential-type logic circuits, the second inputs of the AND 4 elements from the switch 3 receive signals corresponding to a constant potential but input 14 and thus provide input to the inputs of the reference 5 and the checked 6 logic circuits of signals taken from the outputs of the counter 2 pulses.

When diagnosing malfunctions of a pulse-type logic circuit, the second inputs of the And 4 elements corresponding to the pulse inputs of the reference 5 and the 6 tested circuits receive signals from the pulse generator 12. When the first inputs of the And 4 elements are received, they receive single signals from counter 2 the inputs of the reference 5 and the tested 6 circuits receive impulses of short duration. In both cases, the operation of the nodes 7-II of the device is similar to that known.

The proposed device for diagnosing faults in logic circuits makes it possible to diagnose faults in logic circuits of both potential and pulse types.

Claims (2)

1. Auth. St. USSR, cl. G 06 {11/04, No. 446062, 1973. 2. Auth. St. USSR, cl. G 06f 11/00, No. 406197, 1971 (prototype). /four 1O 13