SU1241243A1 - Three-channel device for majority sampling of asynchronous signals - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used in the construction of digital devices of all reliability. The aim of the invention is to increase the reliability of the output information when the frequency of the input signals and the time of their mutual delays change. The device contains an OR element and a delay element, and in each channel the first and second RS-flip-flops, the first and second AND elements, and also the pulse shaper. The device generates an output pulse when it receives both three and two signals, regardless of their relative position. The delay of the second and third signals relative to the first and each other is not limited and does not affect the operation of the device. The device has no restrictions on the frequency range, since does not contain elements that are tuned to the frequency of the input signals. 3 il. (O S /)

Description

The invention relates to automation and computing and can be used in the construction of digital devices for various purposes with the requirements for their reliability.

The purpose of the invention is to increase the reliability of the output information when the frequency of the input signals and the time of their mutual delays change.

FIG. 1 is a functional device diagram; in fig. 2 and 3 are temporal digrams illustrating his work.

The device contains the first 1, second 2 and third 3 sources of input signals, the first 4-6 and the second 7-9 RS-flip-flops, the first 10-12 and the second 13-15 elements AND, the element OR 16, the element 17 delays and drivers 18 -20 pulses

The duration of the time delay generated by the delay element 17 must be less than the duration of the signals of sources 1-3 and more than the duration of the pulses formed by the formers of 18-20 pulses by the duration of the response time RS-three geres, i.e. is selected from the condition of the desired value of the pulse duration of the reset.

The device works as follows.

Before starting the reset pulse, the first RS-flip-flops 4-6 are set to the zero state, and the second RS-flip-flops 7-9 are set to one (the reset circuits are not shown).

Consider the operation of the device at different time ratios of the input signals,

Option one. The signals of the three sources coincide completely (see figure 2-1).

The signals of sources 1-3 (Fig.2.1 a, b, C) are fed to the formers 18-20 pulses, which form pulses on the leading edge at the first output (figure 2, Tg, e, f) and on the falling edge on the second exit (figure 2, 1 n, o, p). Through the second, elements AND 13-15, opened at the first input by the high potentials of the second RS-triggers 7-9, the pulses generated on the leading edge, arrive at the S-inputs of the first RS-triggers 4-6, setting them to one state (Fig.2, 1G, and, k).

High potentials from the direct outputs of the first RS-flip-flops 4-6 open the first elements AND 10-12, the pulses from the output of which set the second RS-flip-flops 7-9 to zero (FIG. 2, I p, s, t) and through the element OR 16 (figure 2, 1l) is fed to the output of the device and the element 17 of the delay. Impulse delayed on an element

 17 delays (Fig. 2, 1 m), goes to the first installation inputs (R-inputs) of the first RS-flip-flops 4-6 and sets them to the zero state. From the second output of the formers 18-20

impulses impulses, formed on the falling edge, set in a single state the second RS-flip-flops 7-9.

Thus, at the output of the device, a pulse is formed which coincides on the leading edge with the output signals. At the end of the input signal, the device is in the initial state.

Option two. The signals of the three sources are partially overlapping (FIG. 2.11).

The signals received by the first, for example, the first 1 and third 3 sources (FIG. 2, IIa, c), set the first RS flip-flops 4.2 and 6 of the first and third channels (FIG. 2, P, d, e) to one state. . The high potentials of their output are open.

the first element is And 12 and the pulse from its output sets the second RS flip-flop 8 of the second channel to zero position (FIG. 2, tic), the high potential from the direct output of which

through the element OR 16 is fed to the output device (figure 2, GTL) and the delay element 17.

The pulse from the output of the delay element 17 (FIG. 2, GTm) returns to the initial zero state the first RS-flip-flop 4 of the first channel and the first RS-flip-flop of the third channel (FIG. 2, TTJ, k). The signal of the second 2 source (FIG. 2, PB), entered third, not

establishes the first RS flip-flop 5 of the second channel (FIG. 2, GTI) as the second element And 14 of the second channel is closed by the input associated with the second RS flip-flop 8 of the same channel (FIG. 2, PS). Finally, the signal of the second 2 source of the second RS7TpHrrep 8 of the second channel is expanded to the initial one.

3

a single state (FIG. 2, Ps) by a pulse from the second output of the pulse former 19, a second channel (FIG. 2, By) formed on the falling edge of the input signal (FIG. 2, Pb).

Thus, a pulse is generated from the second input signal at the output of the device.

At the end of the three input signals, the device is in the initial state.

When the input signals (1FIG. 2, P) move each other, the output pulse is still generated by the signal received by the second

Option three. The signals from the sources of mutual overlap (Fig.3, GG1).

The operation of the device is similar to that described in the second version. An output pulse is also generated from the second input signal.

Option Four. The signal from one of the sources is missing (figure 3, GU)

The absence of signals from one of the sources, for example, the third 3 source of input signals of FIG. 3, PG), causes the second RS-flip-flop 9 of the third channel (FIG. 3, GUM) to be set to the zero state when the second the signal (Fig. 3, TUb, d, i) remains in the zero state until the third 3 input source starts producing signals. At the output of the device, a pulse, as in the previously discussed embodiments, is generated by the signal received by the second (FIG. 3, GUL).

Thus, the device generates an output impulse upon receipt of both three and two signals, regardless of their relative position. The delay of the second and third signals relative to the first and

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each other is not limited and the operation of the HC device is affected.

The invention has the same accuracy of the output information, 5 since the formation of the output signal does not depend on the value of the mutual time delay of the input signals and practically does not depend on the frequency of the input pulses due to 10 because the device does not contain elements tuned to the frequency of the input signals.

Claims (1)

Invention Formula (five A three-channel device for the majority selection of asynchronous signals containing the element OR, connect-. output output with device output and the input of the delay element, and in each channel - the first RS trigger and the first element AND, connected by the output to the corresponding input of the OR element, and the first and second inputs - to direct outputs of the first RS-triggers of this and subsequent channels, respectively, with the first installation inputs of the first RS-triggers of all channels connected to the outputs  a delay element that distinguishes it from I to the fact that, in order to increase the reliability of the output information when the frequency of the input signals and the time of their mutual delays change, a pulse driver, a second RS-trigger and a second the element And connected by the output with the second installation input of the first RS-trngger given channel, the first and second inputs, respectively, with the first output of the pulse generator and the direct output of the second RS flip-flop connected by the first setup input to the second the output of the pulse shaper, and the second setup input - to the output of the first element And the subsequent channel. fiyo. 7 Editor L. Pchelinska Compiled by N. Belinkova Tehred O. Gortvay, Order 3490/44 Circulation 671 Subscription VNIIPI USSR State Committee for inventions and openings 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 FIG. 3 Proofreader A. Obruchar