SU807308A1 - Device for testing pulse distributor - Google Patents

Description

one

The invention relates to computing and automation, in particular to the field of control of digital equipment devices, and can be used to control the operation of pulse distributors and software devices.

The known control scheme for the binary decoder p-.

The closest in technical essence to the present invention is a device for continuous monitoring of a decoder comprising a pulse generator, a group of first elements And, elements OR, and element OR NOT.

The known device provides control of the absence of a signal at the output of the decoder or the presence of an extra signal 2j.

However, the known devices have the following disadvantages:

a) they do not detect failures resulting in the appearance of a false signal at one output of the decoder with

. simultaneous disappearance of the true signal at another output, i.e. do not control the sequence of signals of the decoder;

b) the apparatus for determining the excess or excess signals at the output of the decoder (without the disappearance of the true) is too complicated;

c) the circuit is not operational when monitoring the output signals of the daaifratora, overlapped in time on the fronts.

Such signals despread overlap in time on the fronts,

often used in shaping

time-pulse sequences (programs).

The aim of the invention is to increase the reliability of the control and expand the functionality

devices.

The goal is achieved by the fact that in a device for controlling a pulse distributor, comprising a pulse generator, a group of first

AND elements, OR elements and OR-NOT element, a second AND element, a pulse expander, a threshold element and a delay element are introduced, and the output of each bit of the controlled pulse distributor is sub.token to the corresponding input of the threshold element and to the inputs of the first element group AND outputs through the first OR element connected in series and the pulse expander are connected to the first input of the OR-NOT element, the output of which is connected by one input of the second OR element connected by another input through the second ele Ment and to the output of the threshold element and the first output of the delay element, the second output of which is connected to the second input of the element OR NOT, and the input to the output of the pulse generator and to the input of the controlled pulse distributor.

FIG. 1 shows a functional diagram of the device; in fig. 2 - time diagrams of his work.

The device contains a group of 1 first elements AND, the first element OR 2, the expander 3 pulses, the element OR NOT 4, the second element OR 5, the second element AND 6, the threshold element 7, the delay element 8, the generator 9 pulses and a controlled distributor 10: pulses .

FIG. 1 the following notation is accepted: VL, V, ..., Vm-t are the signals of the decoder of the distributor 10; t is the overlap time of the signals of the adjacent outputs of the decoder of the distributor 10; a, b, c, d, d, e, out. points of the schematic where time diagrams are considered (Fig. 2). FIG. 2-11 - disappearing siggsh. in case of a fault in the distributor 10 (when the signal at the output V

12 - signals in the event of a malfunction in the distributor 10 (from the excess signal at the output Y,);

13 - appearing signals in case of a failure in the distributor 10 (from the disappearance of the signal at the output U2); SI counting pulses; SI (ut-j - inverse pulses shifted by time t I SI (ut) - shifted by time

j tj counting pulses.

D1. At

2

The device works as follows.

The monitored signals 5, X (r I from the output of the decoder distributor 10 and having overlap in time on the front of duration t are pairwise sent to the inputs of elements AND of group 1.

The timing overlap of the output signals of the distributor 10 is necessary in software devices to eliminate interference, the same as with France || The signals, Y, ..., components of the time are pulse intervals (program), and can be obtained either by extending the duration of each of the signals of the distributor 10, or by one of the known methods.

So, from the outputs of the e-emitters AND group 1, the overlap pulses are collected by the element .OR 2 (Fig. 2a), further extended by the duration of the expander 3 (Fig. 26) and fed to one input of the element OR NOT 4. At the second

the stroke from the inverse output of the element is fed to the counting pulses (Fig. 2 and e), held in time. element output OR NOT 4 forms signal log. Oh, which passes through the element OR 5, to the output of the device. .

Signal log. O corresponds to the absence of a fault in the distributor 10 ..

At the same time, the control signals Al, U, ..., are fed to the inputs of element 7 with a threshold greater than one, at the output of which short pulses (interferences) are formed, equal to the duration of the crossing signal U / (Fig. 2d); These interference pulses are gated by counting pulses (Fig. 2e) delayed in time. Interference pulses and gating pulses do not coincide in time, and a signal log is generated at the output of the And 6 element. O (FIG. 2e), which is fed to the second input of the element OR 5, and a log signal is generated at the output. ABOUT. .

Signal log. O corresponds to the absence of a fault in the distributor 10.

In order to establish the disappearance of any of the signals of the decoder of the distributor 10, it is sufficient to establish the fact of the disappearance of the overlapping pulses (Fig. 2a). .

. For example, in the absence of the expected signal, the pulses 11 will disappear at the output of the element OR 2 at point a and b. At the same time, a output pulse 13 is generated at the output of the element OR NOT 4 at point b (hereinafter at the output of the device). on a timeline.

Thus, the device controls the sequence of occurrence of the signals yj- and, therefore, detects a failure in the distributor 10, leading to the disappearance of the next (expected) signal when a false signal appears or does not appear.

When two or more signals appear simultaneously, for example, a D (false) and t, the output of element 7 generates a fault signal 12 of the distributor 10 (Fig. 2d), then signals 12 at the point and at the output of the device (Fig. 2e, out. ).

The use of the invention permits;

  a) provide full control of faults and random failures in a controlled pulse distributor;

b) to ensure the control of the sequence of signals in a simple way and by small means;

c) to ensure control of signal alternation, regardless of their duration, if they overlap in time on the fronts.

invention formula

A device for controlling a pulse distributor, comprising a pulse generator, a group of first AND elements, an OR element and an OR-NOT element, characterized in that, in order to increase the reliability of monitoring and expanding the functionality of the device, a second AND element, a pulse expander, a threshold element are introduced into it and a delay element, with the output of each bit of the monitored pulse distributor connected to the corresponding input of the threshold element and to the inputs of the group of first elements I, whose outputs through

the first OR element connected in series and the pulse expander are connected to the first input of the OR OR NOT element, the output of which is connected to one input of the second OR element connected by another input through the second AND element to the output of the threshold element and the first output of the delay element which second output is connected to the second the input element OR NOT, and the input - to the output

. pulse generator and to the input of the controlled pulse distributor.

Sources of information taken into account in the examination

1. US patent W 3886520, class, 340-146, 1, published, 1975.

2. Sellers F.F. Methods for detecting errors in the operation of digital computers. M., World,

20 1972, p. 228, FIG. 12.3 (prototype).

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Claims (1)

Claim . A device for monitoring a pulse distributor containing a pulse generator, a group of first AND elements, OR elements, and an OR-HE element, characterized in that, in order to increase the reliability of control and expand the functionality of the device, a second AND element, a pulse expander, is introduced into it an element and a delay element, and the output of each discharge of the controlled pulse distributor is connected to the corresponding input of the threshold element and to the inputs of the group of the first AND elements, the outputs of which are through The first connected OR element and the pulse expander are connected to the first input of the element. that OR-HE, whose output is connected to one input of the second element. OR connected by another input through a second AND element to the output of the threshold element and the first output of the delay element, the second output of which is connected to the second input of the OR-NOT element, and the input to the output. pulse generator and to the input of the controlled pulse distributor.