SU1257649A1 - Device for checking two pulse sequences - Google Patents

Abstract

The invention relates to the field of digital computing and can be used in computers and digital systems with high data rates. comradely. A distinctive feature of the device is that it can be used to monitor pairs of impulses for which it is not known in advance which of the inputs the pulse will be received first, or in cases when the device must be connected to control at an arbitrary, previously unknown time. of time. This greatly expands the field of application of the device. The aim of the invention is to enhance the functionality by controlling sequences with different order of arrival. The goal is achieved by the introduction of the third and fourth elements And, 3 Il. (L with: yu ate SI O 4; o

Description

The invention relates to digital computing and can be used in computers and digital systems with increased reliability.

The aim of the invention is to enhance the functionality by controlling sequences with different order of arrival.

FIG. 1 shows a functional diagram of the device; Figures 2 and 3 show the timing of its operation for cases of non-overlapping and partially overlapping pulse sequences.

The device contains the first 1 and second 2 triggers, the switch 3, the elements AND 4-7, the element OR 8, the one-oscillator 9, the inputs 10 and 11 of the first and second controllers 1 "1x device sequences, the input 12 of the initial installation of the device, the output 13 of the device , elements AND-NOT 14 and 15.

The trigger 1 is designed to memorize which of the device inputs the last pulse arrived, and control in accordance with this switch 3. It is a synchronous JK trigger, which switches to the opposite state on the falling edge of the input C, if. The inputs R and S of the trigger are intended for its initial setup and are asynchronous.

Trigger 2 is triggered; meant to control the initial setup of trigger 1 when the device is started. It also prohibits the operation of switch 3 until the initial setup of trigger 1 is correct. Trigger 2 is a 1 × 1 trigger, which is switched to a single state on the falling edge of the pulse received at the combination of the J and C inputs. Input R is asynchronous; it is used to initialize trigger 2 to the zero state.

The switch 3 generates error signals at the output of the device failures 13 if the sequence of pulses at the inputs 10 and 11 of the device is disturbed. It is included in the operation only in a single state of the trigger 2.

Elements 4, 5, together with elements 14, 15 are intended to ensure the operability of the device if its inputs 10 and 11 are partially overlapping in sequence of pulses. In this case, the output element and 4

only part of the pulse arrives at the input 10 of the device and does not overlap with the impulse received at input 11 (see Fig. 3). Similarly, the output element And 5 passes only part of the pulse received at the input 11 and not overlapping with a pulse at the input 10 of the device (see Fig.3).

Elements And 6.7 are for

generating signals for the initial setup of the trigger 1. Element I 6 generates a signal at the S input of the trigger 1, if the trigger 2 is in the initial state and the pulse arrived first

to input 10 of the device. Element And 7 generates a signal at the R input of the trigger 1, if the trigger 2 is in the initial state and the first pulse arrives at the input I1 of the device.

The element OR 8 is designed for forming the switching signals of the trigger 1 during the operation of the device.

A single vibrator 9 is constricted to form a pulse that triggers trigger 1 to the opposite state if, as a result of an error in one of the input sequences, the device has formed the output

13, the error signal, and the trigger 1 as a result of the disappearance of one of the input pulses, turned out to be in the state opposite to the required one. The single vibrator 9 generates pulses on the back front of the pulse received at the output 13 of the device. The duration of the pulse generated by the one-shot 9 is chosen as the minimum length, which ensures reliable triggering of the trigger 1.

The device works as follows.

Before starting work on entry 12

the initial installation of the device, an initial installation signal is given, by which the trigger 2 is set to the zero state. The trigger state i is arbitrary.

55 Impulse controlled: sequences received first at inputs 10 and And devices, jHa4anbHyTo installs trigger I and for

putting the device into operation - setting trigger 2 to a single state

Let the pulse go first to the input 10 of the device (see Fig. 2), This pulse passes through the open elements AND 4 and 6 to the input S of the trigger 1 and sets it to one; At the same time, this pulse passes through the element OR 8 to the trigger input 1 of the trigger and the combined J- and C-inputs of the trigger 2. On the falling edge of this pulse, the trigger 2 switches to the one state and the output signals Critical elements AND 6, 7 enable the trigger 1 at the counting input {submitting a single signal to the inputs J and K of the trigger 1) and opens the switch 3. Tripping the trigger 1 on the trailing edge of this pulse does not occur as at the moment of the end of the pulse a zero signal is present at the inputs of J and K of the trigger 1. After trigger 1 is set to one, the device is ready to monitor the input sequences.

With proper formation of the input sequences, the next pulse arrives at the input 11 of the device. Through the elements of AND 5 and OR 8 it passes to the inputs of trigger 1 and switch 3. The output of switch 3 does not arrive, since the latter is closed by a zero signal from the inverse output of trigger 1, and on its trailing edge trigger 1 switches to the opposite, i.e. . zero connection.

Next comes a pulse to the input 10 of the device. Through the elements of AND 4 and OR 8, it passes to the sync input of trigger 1, and on its trailing edge, trigger 1 switches to the opposite (single) state. It also does not pass to the output of switch 3, since the latter is closed by a zero signal from a single output of trigger 1.

In the absence of distortions in the input sequences, the device operates as described above.

When a pulse disappears in one of the input sequences, for example, a pulse at the input 11 of the device (see figure 2), two pulses are received at the input of the trigger 1 from the input 10 of the device. First of

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They are set by trigger 1 in a single state, and the second passes through switch 3, opened by a signal from a single output of trigger I, to output 13 of the device, signaling the distortion of monitored sequences of pulses. By its falling edge, this pulse triggers trigger 1 to the zero state. After that, on the falling edge of the output pulse 13 of the device, the one-shot 9 produces a pulse that passes through the element OR 8 and again switches the trigger 1 to one state. If in the subsequent distortions of the monitored sequences does not occur, the device functions as described above, without issuing error signals.

If there is a skip pulse in the sequence received at the input 10 of the device, then two impulses are successively received at the input of the P h (see figure 2). The first of them with its falling edge sets the trigger 1 to the zero state, and the second passes through the open switch 3 to the output 13 of the device, indicating a pulse skip. Trigger 1 switches to single state again. On the falling edge of the pulse at the output 13, the one-shot 9 produces a pulse, which returns the trigger 1 to the zero state and thereby prepares the device for the next work cycle.

If the outputs 10 and P of the device are partially overlapped, I

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pulses (see Fig. 3), then at the outputs of the elements 4 and 5 only those parts of the pulses that do not coincide in time with the pulses at the opposite input appear. Consequently, due to the presence of elements AND 4 and 5 at the inputs of the device, the task of monitoring partially overlapping input pulse sequences is solved in the same way as the task of controlling non-overlapping input sequences.

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Claims (1)

Invention Formula A device to control two dm-: pulse sequences, containing two elements And two elements NOT, two triggers, switch, single-vibrator, the input of the first controlled sequence of the device is connected to the first input of the first element AND and to the input of the first element NOT, the input of the second controlled sequence is connected to the first input of the second element AND, and to the input of the second element NOT, the outputs the first and second elements are NOT connected to the second inputs of the second and nepBoho elements AND, respectively, the output of the first element AND is connected to the first information input of the switch and the first input of the OR element, the second input is the second information input of the switch, the output of the OR element with the synchronous input of the first trigger, the forward and inverse outputs of which are connected respectively to the first and second control inputs of the switch, the output of which is the output of the device and connected to the input one-shot, the output of which is connected to the third to 12576496 the input of the OR element, the R input of the second trigger is the input of the initial setup of the device, characterized in that, in order to expand the functionality of the capabilities by controlling sequences with different arrival order, the third and fourth elements of the AND, and the direct output The second trigger is connected to the J and K inputs of the first trigger and the third and fourth controls to the switch inputs; the inverse output of the second trigger is connected to the first 15 inputs of the third and fourth elements, and the output of the first And is connected to the second input of the third element And, the output of which is connected to the S-input of the first trigger, R-input 20 of which is connected to the output of the fourth element And, the second input of which is connected to the output of the second element And, the output of the element OR is connected to J- and With the inputs of the second trigger, K - 25, the input of which is connected to the bus of zero potential of the device. jraddiktor I Rybchenko Compiled by E.Toropov Tehred L.Serdyukova Order 4958/48 Circulation 671 Subscription VNIIPIgosudarstvennogo Committee of the USSR for inventions and discoveries 113035 Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Corrector S.Cherni