SU1223232A1 - Device for checking two pulse sequencies - Google Patents

Abstract

The invention relates to computing and can be used in computers and digital systems with increased reliability of operation. The aim of the invention is to increase the reliability of the control. A distinctive feature of the proposed device is to ensure the control of sequences of pulses that have a temporary overlap, as well as the fact that the proposed device performs a pulse, the number of which corresponds to the number of missed pulses in KOHTpojjHpye pulse sequences. The goal is achieved by introducing a 1K trigger and a single vibrator. 3 il. i SL

Description

The article relates to computing and can be used in computer systems and digital systems with increased reliability.

The aim of the invention is to increase the reliability of the control.

FIG. I presents the functional diagram of the proposed device; in fig. 2 - time, device operation diagram with non-intersecting pulse sequences; in fig. 3 is a time diagram of the operation of the device when pulse sequences arrive at its inputs, which are partially overlapping in time.

The device contains a counting trigger 1, 1K-trigger 2, selector 3, one-oscillator 4, element AND 5, element AND 6, element OR 7, input-8 of the first controlled sequence of the device, input 9 of the second controlled sequence of the device, input 10 of the initial installation devices, device output 11, elements NOT 2 and 13.

In Figs 2 and 3, the following symbols are designated: 8 and 9 are the signals at the inputs 8 and 9 of the Device, respectively; 2 - signal at the direct output of trigger 2; 5 and the outputs of the elements

6 - signals to And 5 and 6, respectively; /

7 -

signal at the output of the element OR 7; - signal at the direct output of flip-flop 1; 3 - the signal at the output of the selector 3j 4 - the signal at the output of the one-shot 4.

The device works as follows.

Before operation, the triggers I and 2 are set to the zero state at input 10 of the device.

The device is put into operation (Fig. 2) only after the second sequence of the first pulse arrives at input 9, regardless of which of the device inputs came first. This allows the device to be operated at any time.

The first pulse received at the input 9 of the second sequence, with its trailing edge, switches the trigger 2 to the unit state, which is maintained until the end of the device operation. A single trigger 2 signal opens the AND 5 and 6 elements.

t

ten

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d The first impulse received at input 8, of the first sequence passes through AND 5 and comes directly to the first information input of the selector 3 and through the OR 7 element to the counting input of trigger 1. With the falling edge of this pulse, trigger 1 is switched to a single state and the signal from its direct output goes to the first control input of the selector 3. However, the selector 3 does not work, since by this time the pulse at its first information input has already ceased to exist.

The next pulse arrives at the input 9 of the second device sequence, passes through the Ibis element and goes directly to the second information input of the selector 3 and through the OR element 7 to the counting input of trigger I. By the falling edge of this pulse, trigger 1 is brought to zero. At the same time, at the first control input of the selector 3, the signal is picked up and appears at its second control input.

However, selector 3 does not work, since by this time the impulse at its second information input has already ceased to exist.

When a sequence fails, the sequence of arrival of pulses at inputs 8 and 9 of the device is violated, as a result of which, in the time interval between the previous and subsequent arrivals of pulses at one of the inputs, a pulse does not arrive at the other input. As a result, the signal formed at the control input of the selector 3 by the previous pulse will not be removed and the subsequent pulse at the same input of the device by the leading edge will trigger the selector 3, and the falling edge will switch trigger 1 to another state. As a result, a pulse appears at the output of the selector 3, which is fed to the input 11 of the device, signaling the failure of the pulse sequence and to the input of the one-shot 4.

One-shot 4 on the falling edge. pulse from selector 3 output

55 forms a pulse, which through the third input of the element OR 7 enters

. to the trigger input 1 and transfer it to the opposite state

thirty

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previous, i.e. to the one before the onset of failure.

If two or more pulses are received at one of the device inputs, then the same error signals will be generated at its output 11, which makes it possible to judge the number of failures (errors) in the controlled sequences of pulses.

If the monitored pulse sequences partially overlap with time (Fig. 3), then the passage through elements 5 and 6, the elements 12 and 13, the latter transform into a non-repeating sequence of pulses, due to which partial overlap of the pulses operation of the device does not affect.

Claims (1)

Invention Formula A device for controlling two pulse sequences containing two NOT elements, two AND elements, an OR element, a selector, a counting trigger, the input of the first monitored sequence of the device connected to the input of the first HE element and to the first input of the first And element, the input of the second monitored sequence of the device with the first input of the second element I and with the input of the second element NOT, the output of which is connected to the second input of the first ele And, the output of which is connected to the first input of the OR element, the second input of which is connected to the output of the second element AND, the second input of which is connected to the output of the first element NOT, the output of the selector is the output of the device, characterized in that , a 1K-trigger and a one-shot are entered into the device, with the output of the selector connected to the input of the single-vibration device, the output of which is connected to the third input of the OR element, the output of which is connected to the counting input 5 of the counting trigger, the direct output of which is connected to the first control input of the selector, the first information input of which is connected to the output of the first element I, the output of the second element I is connected to the second information input of the selector, the second control input of which is connected to the inverse output of the counting trigger, the input of the second controlled sequence of the device is connected to the | 3rd input and the 1K-trigger synchronous input, the zero input of which is connected to the zero input of the counting trigger and is the input of the initial installation device, the output of the 1K-flip-flop is connected to the third inputs of the first and second elements And, the K-input of the TC-flip-flop is connected to the tire of zero potential of the device. 0 0 eleven