SU703815A1 - Device for diagnosis of decoders - Google Patents

Description

one

This invention relates to the field of computer technology, in particular, to decoder control devices.

A device for controlling decoders is known, comprising a decoder, AND elements, a synchronizing generator and NO elements 1.

The disadvantage of such a device is the impossibility of detecting all faults.

Closest to this invention is a device for controlling decoders that contain comparison circuits, an encoder, and an OR element, with each input of the decoder connected respectively to the first input of the comparison circuit, the second input of which is connected to the outputs of the encoder, the outputs of all comparison circuits are connected with the inputs of the OR element, the output of which is the output of the device J2.

A sign of the health of the leftover when monitoring such a device is the coincidence of code combinations at the input

a decoder with codewords at the outputs of the decoder after they are coded back into the encoder.

A disadvantage of this device is the control of the decoders is the inability to localize the failure and select the failure and sustained failure in the elements of the decoder.

The aim of the invention is to reduce the time to search for a failure and select sustainable failure and failure in the elements of the decoder:

This is achieved by the fact that the block of input actions, the forward and inverse drivers

5 code and a display unit, the first input of the input actions block is connected to the second output of the synchronizing generator, the output group of the input actions block is connected to the input group of the monitored decoder, the output group of which is connected to the output group of the forward and inverse shaper codes, the first input of which is connected to the first 370 output of the generator, the group of inputs of which is connected to the group of outputs of the direct and inverse code, the group of outputs of the comparison is connected to the group of inputs of the display unit , Proposed ustroystvodl diagnos. ticks of decoders are shown in the drawing, where 1 is a synchronizing generator, 2 is a bpoc input, 3 is a decoder, 4 is a forward and inverse shaper, 5 is a comparison unit, G is a display unit. The binary elements transition property is based on the proposed device for diagnosing decoders , which the decoder consists of, from the state of logical O to the state of logical i k to back, under the influence of an input transformed signal, which is a code combination, in each parcel which has a transition. or 1 .-. 0, respectively, when the input code message is a logical 0 or logical 1, If the binary element under the influence of the two-level input signal has not changed its state, then the separated from the output two-level signal of the decoder is direct and the inverse code sequence will coincide in the code message corresponding to the output circuit in which the content of this double element is contained, which is a sign of failure on this output circuit of the monitored decoder. The proposed device operates as follows. When the code combinations arrive at the inputs of the decoder 3, the latter are preliminarily fed to the inputs of the input actions block 2, where, under the influence of the sync pulses of the synchro generator 1, a two-level signal is generated, or at zero or one. code parcel in the input code sequence of the decoder 3 Transformed input by a code card. The binning of the decoder 3, in the form of a sequence of two-level signals, is fed from the output of the block of input actions 2 to the input of the controlled decoder 3, the output of which also appears to be the decrypted code combination,: which is a two-level signals that are fed to the inputs of forming ± He eats a direct and inverse code 4. D | od the influence of clock pulses with vy5: 4. the clock of the synchro-generator 1 in the form (X) of the va1-barely direct and inverse code 4 is carried out in the allocation of these combinations and their supply to the inputs of the comparison unit 5. As noted above, if there is a failure in the binary element or a failure that occurs in the absence of a binary element transition under the influence of a transition or a Gh-O two-level signal, then: there is a coincidence of the code sendings of the direct and inverse code combinations corresponding to the output of the decoder 3, the circuit of which contains the failed binary element. Then, in the event of a failure in the i-th output, the I-th code sendings of the direct and inverse output code combinations of the decoder 3 will coincide with the output of the t-th unit of comparison block 5, the error will occur with the i -th decoder 3, which enters; to the i-th input of the display unit 6; If there is a steady switch on the t-th stage; 1 of the decoder, then the arrival frequency: signal error to the t-th input of the display unit -6, which includes LEDs or incandescent bulbs, Yusch | ees loads of output elements of the block is compared 5, a multiple frequency clock sinhrogenera -; of torus 1 and there are intermittent indications on the t -th output of the decoder, which characterizes the failure on this output. If there is a random binary element in the circuit on the t -th output of the decoder 3, single indicator flickers will be observed for a long time interval, which will characterize the failure element on the th-th output of the decoder 3, Tshim way We can conclude that the proposed device for the diagnosis of decoders allows not only to control the operation of the decoder, but also to localize Failure with the indication of the output number of the decoder, according to which For failure. Signal formation is an error that controls the control impulse; by means of the synchronous generator it allows to select the more stable failure and failure of the binary elements of the decoder. Since the diagnostic control is carried out by converting the processed information to the input of the decoder, followed by restoring the output code combination, this diagnostic process can be performed in the

processing the data received on the deshi fraros, which impairs its accuracy and reliability.

Claims (1)

1.Devidence certificate of the USSR No. 226275, cl. G-06 Р-11 / ОО, 1969, 2. Sellers F, Methods of error detection: in the work of 3UBM; M., 1972, p. 226-228 (prototype).