SU1275448A1 - 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 increased reliability of operation, can be used to monitor the distributor. The aim of the invention is to increase the reliability of the control by ensuring full control of the distortions of the input bursts of pulses from the moment they occur for a given length of the bursts. The device makes it possible to detect both the loss and the presence of an extra pulse. The goal is achieved with the introduction of a decoder, two triggers, two OR elements. 3 il. (L

Description

The invention relates to digital computing and can be used in computers and digital systems with increased reliability of operation and can be used to control the pulse distributor.

The aim of the invention is to increase the reliability of control by providing control of bursts of pulses.

Figure 1 shows the functional diagram of the device; in FIG. 2 and 3 are time diagrams of its functioning.

The device contains counters 1 and 2, a decoder 3, triggers 4 and 5, a selector 6, elements 7 and 8, single vibrators 9 and 10, elements OR 11 and 12, input 13 of the first controlled sequence of the device, input 14 of the second controlled sequence of the device, the input 15 of the initial installation of the device, the output 16 of the device, the outputs 17-20 of the decoder 3 and the elements NOT 21 and 22.

Counters 1 and 2 are designed to control the number of pulses sequentially arriving at the inputs 13 and 14 of the device, respectively. Switching of counters 1 and 2 occurs on the trailing edge of the pulses arriving at their counting inputs. The conversion factor of the counter 1 (2) is selected so that after the receipt of a given number of pulses, a single signal appears at its output. In general, counters 1 and 2 can be set to a different number of pulses. Counters 1 and 2 are reset to their initial state when a pulse is received at the reset input of the corresponding counter. When a signal arrives at the installation input in units, the counters 1 and 2 are set to a state in which a single signal appears at the output. The decoder 3 is designed to set the desired initial state of the counters 1 and 2 and enable the selector 6 when starting the device.

Triggers 4 and 5 record the appearance of the first pulses at the inputs 13 and 14 of the device, respectively, and generate control signals at the inputs of the decoder 3 to control the startup of the device.

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The selector 6 is used to generate error signals if the number of pulses received at the inputs 13 and ^f 14 of the device does not coincide with the preset one.

Elements I 7 and 8 together with elements HE 21 and 22 prohibit the arrival of pulses to the counting inputs of counters 1 and 2, respectively, in those 10 cases if their number in the packet exceeds a predetermined one, or if the corresponding counter 1 and 2 was not present before the arrival of the next pulse packet It is set to its initial state (the number of pulses in the packet turned out to be less than the set value) and a single signal is present at its output.

Single vibrators 9 and 10 are used to generate reset pulses of the counters of 20 meters 1 and 2 in those cases when a single signal appears at the outputs of the counters 2 and 1. Single vibrators 9 and 10 form a single signal on the leading edge of the signal received at their 25 inputs. The duration of the pulse of a single vibrator 9 (10) is selected based on the conditions for a reliable installation of the counter 1 (2) in the initial state.

Elements OR 11 and 12 form 30 reset signals of counters 1 and 2, respectively.

In FIG. 2 and 3, the signal numbers correspond to the numbers of the elements at the output of which the corresponding signal appears.

The device operates as follows.

Before starting work, input 15 of the initial installation of the device is supplied with the installation signal in the initial (reset) state. On this signal, triggers 4 and 5 are set to zero. Their output signals are fed to the inputs of the decoder 3. At the first output 17 of the decoder 3, a single signal appears, which sets the counters 1 and 2 in a single state. The device is ready to go.

Consider the operation of the device when the input pulse sequences are formed without distortion. The input sequences can be the outputs of the distributor.

Let after connecting the device the first pulses to enter 13 (figure 2). Then the first one received at the input 13 of the first controlled sequence. The pulse sets trigger 4 to a single state. A single signal from the output of trigger 4 goes to the first input of decoder 3. As a result, its signal 17 disappears, and a single signal appears at output 18, which passes through OR 12 and sets the counter: 2 to a cool state, preparing it for example burst of pulses that enters the input 14 of the device. If there are still pulses at the input 13 of the device (their number can be from 0 to p-1, where η is the number of pulses in the packet, depending on the moment the device is turned on), then they do not make any switching in the circuit.

The first pulse received at the input 14 of the second controlled sequence of the device, sets the trigger 5 in a single state. Its output signal is supplied to the second input of the decoder 3, as a result of which a single signal disappears at its output 18, and a single signal appears at the output 20, which opens the selector 6. The device goes into control mode.

The pulses arriving at the input .14 of the device pass through the And 8 element to the input of the counter 2, switching it sequentially to the first, second, ..., η-e state. After the arrival of the ηth pulse (Fig. 2 shows the timing diagrams for n = 3), on its trailing edge, a single sig appears on the output of counter 2, cash, which closes And 8 and goes to the inputs of the selector 6 and one-shot 9. One-shot 9 generates a pulse that passes through the element OR 11 and resets the counter 1 to the zero state.

After that, η pulses are sequentially fed to the input 13 of the device, which are counted by counter 1. After the ηth pulse of 50 s is received, a single signal appears at the output of counter 1, which prohibits further pulses from entering its input and opens the selector 6. On the leading edge of this The signal of one-shot 10 forms a pulse, which sets the counter 2 to its original state. In the future, the device operates as described.

Consider the operation of the device in the presence of distortion in controlled sequences.

Figure 2 presents the timing diagram of the operation of the device, if the number of pulses in one of the packets received at the input 13 of the device 10 exceeds a predetermined (n = 3) and is equal to four. In this case, the device operates as follows.

At the end of the third pulse, a single signal appears at the output of counter 1, which closes the And 7 element, returns counter 2 to its initial state and opens selector 6. As a result, the next fourth (extra) pulse arriving at input 13 of the device through selector 6 passes to the output 16 of the device, signaling an error in the operation of the pulse distributor. In the future, the device operates as described above.

Fig. 3 shows a timing diagram of the operation of the device if the number of pulses in one of the packets arriving at the input 14 of the device is less than a predetermined one and is equal to two. In this case, the device operates as follows.

After the receipt of two pulses at the output of counter 2, a single signal does not appear and counter 1 is not set to the initial state, element And 7 is closed by a single signal from the output of counter 1. As a result, all pulses arriving at input 13. of the device pass through selector 6 to the output 16 of the device, signaling a distortion of the monitored sequences. Next, the first pulse entering the input 14 of the device puts the counter 2 in a single state. As a result of this, the counter 1 returns to its initial state, and the And 8 element is closed and the next two pulses of the packet received at the input 14 of the device pass through the selector 6 to the output 16 of the device. Thus, as a result of distortion55, distortion (loss of momentum) of the pulse train at input 14, five pulses are received at output 16, signaling an error. Further, the DEVICE functions as described above in the mode of normal operation.

Claims (1)

The invention relates to digital technology and can be used in computer and digital systems with increased reliability of operation and can be used to control the pulse distributor. The aim of the invention is to increase the reliability of control by ensuring the control of pulse bursts. Figure 1 shows the functional diagram of the device; FIGS. 2 and 3 are timing charts of its operation. The device contains counters 1 and 2, decoder 3, triggers 4 and 5, selector 6, elements 7 and 8, single vibrators 9 and 10, elements OR 11 and 12 input 13 of the first monitored device sequence, input 14 of the second monitored device sequence, input 15 of the initial installation of the device, the output 16 of the device, the outputs 17-20 of the decoder 3 and the elements HE 21 and 22, the Counters 1 and 2 are designed to control the number of pulses sequentially arriving at the inputs 13 and 14 of the device, respectively. Switching of counters 1 and 2 takes place at the falling edge of the pulses arriving at their counting inputs. The conversion factor of counter 1 (2) is chosen so that after the arrival of a given number of pulses, a single signal appears at its output. In the general case, counters 1 and 2 can be tuned to a different number of pulses. The counters 1 and 2 are reset to the initial state when a pulse arrives at the reset input of the corresponding counter. When a signal arrives at the installation input in units, counters 1 and 2 are set to the state at which a single signal appears at the output. The decoder 3 is designed to set the Required initial state of the counters 1 and 2 and turn on the selector 6 when the device starts. The triggers 4 and 5 fix the appearance of the first pulses at the inputs 13 and 14 of the device, respectively, and generate control signals to the inputs of the decoder 3 to control the start of the device. 482 Selector 6 serves to generate error signals, if the number of pulses received at inputs 13 and 14 of the device does not match the given one, Elements 7 and 8, together with elements 21 and 22, prohibit the entry of pulses to the counting inputs of counters 1 and 2, respectively. In those cases, if their number in the packet exceeds the specified one, or if before the arrival of the next batch of pulses, the corresponding counter 1 and 2 were not reset (the number of pulses in the pack turned out to be less than the specified one) and at its output there is a single signal al, monostable multivibrator 9 and 10 serve to generate a reset pulse counters 1 and 2 in those cases where the outputs of counters 1 and 2 is a single signal, the monostable 9 and 10 form a single signal on a rising edge of the signal incoming on their inputs. The pulse duration of the one-shot 9 (10) is chosen based on the condition of reliable setting of the counter 1 (2) to the initial state. Elements OR 11 and 12 form the reset signals of counters 1 and 2, respectively, i. In Figs 2 and 3, the numbers of the signals correspond to the numbers of the elements at the output of which a corresponding signal appears. The device works as follows. Before starting work, the setup signal is reset to the initial setup input 15 (reset). By this signal, the triggers 4 and 5 are set to the zero state. Their output signals are fed to the inputs of the decoder 3. At the first output 17 of the decoder 3, a single signal appears, which sets the counters 1 and 2 to a single state, the device is ready for operation. Consider the operation of the device when the input pulse sequences are formed without distortion. Input sequences may be distributor outputs. Let, after connecting the device, the first pulses arrive at the input 13 (FIG. 2). Then the first arrived at the input 13 of the first controlled sequence. The impulse sets the trigger 4 to a single state. A single signal from the output of the trigger 4 is fed to the first input of the decoder 3. As a result, a signal disappears at its output 17, and a single signal appears at the output of 18, which passes through the OR element 12 and sets the counter; 2 to the zero state, preparing its example of a burst of pulses, which is fed to, input 14 of the device. If there are still pulses at the device input 13 (their number can be from O to n-1, where n is the number of pulses in the packet, depending on the moment of switching on the device), they do not make any switchings in the circuit. The first pulse received at the input 14 of the second controlled sequence of the device sets the trigger 5 to one state. Its output signal arrives at the second input of the decoder 3, as a result of which a single signal disappears at its output 18, and a single signal appears at the output 20 that opens the selector 6. The device switches to the control mode. The pulses arriving at the input .14 of the device pass through AND 8 to the input of counter 2, switching it successively to the first, second, ..., nth state. After the arrival of the nth pulse (Fig. 2 shows the time diagrams for) at its trailing edge, a single signal appears at the output of counter 2, which closes the element AND 8: and goes to the inputs of the selector 6 and: the one-shot 9. A single vibrator 9 generates a pulse that passes through the element OR 11 and resets the meter 1 to the zero state. After that, n pulses are successively input to the 13 devices, which are counted by counter 1. After the n-th pulse arrives, a single signal appears at the output of counter 1, which prevents further pulses from entering its input and opens the selector 6. The leading edge of this signal, the one-shot 10, generates a pulse, which sets the counter 2 to its initial state. In the future, the device operates as described. Consider the operation of the device in the presence of distortions in controlled sequences. Figure 2 presents the timing diagram of the operation of the device, if the number of pulses in one of the packs received at the input 13 of the device exceeds the specified () and is equal to the chip. In this case, the device operates as follows. At the end of the third pulse, a single signal appears at the output of counter 1, which closes element 7 and returns counter 2 to its initial state and opens the selector 6. As a result of this, the next fourth (extra) pulse arriving at the input 13 of the device through the selector 6 passes to the output 16 of the device, signaling an error in the operation of the pulse distributor. In the future, the device operates as described above. On fig.Z presents a timing diagram of the operation of the device, if the number of pulses in one of the packs received at the input 14 of the device is less than the specified and equal to two. In this case, the device operates as follows. After the arrival of two pulses at the output of counter 2, a single signal does not appear and the counter 1 is not reset to the initial state, the And 7 element is closed by a single signal from the output of counter 1. As a result, all the pulses input to the device 13. through the selector 6 to the output 16 of the device, signaling the distortion of the monitored sequences. Further, the first pulse arriving at the input 14 of the device translates the counter 2 into a single state. As a result, counter 1 returns to its original state, and EI 8 closes and the next two packets of the packet received at input 14 of the device pass through selector 6 to output 16 of the device. Thus, as a result of the distortion (loss of impulse) of the packet of pulses at input 14, five impulses signaling an error are received at output 16. In the future, the device operates as described above in the mode of normal operation. Claims An apparatus for monitoring two pulse sequences comprising two counters, a selector, two AND elements, two NOT elements, two one-vibrators, the input of the first monitored device sequence being connected to the first input of the first And element and the first information input of the selector, the second information input of which is connected With the first input of the second element And is the input of the second controlled sequence of the device, the output of the first counter is overflowed to the first input the first group of control inputs of the selector, with the input of the first one-shot and the input of the first element NOT, the output of which is connected to the first input of the first element AND whose output is connected to the counting input of the first counter, the overflow output of the second counter connected to the first input of the second group of control inputs the selector, with the input of the second one-shot and the input of the second element HE, the output of which is connected to the second input of the second element AND whose output is connected to the counting input of the second counter, the output of the torus selectors 48 is the output of the device, distinguished by the fact that, in order to increase the reliability of control by providing control of the pulse bursts, two triggers, a decoder, two OR elements are entered into the device, the input of the initial installation of the device is connected to zero inputs of the first and second triggers, the output of the first the trigger is connected to the first input of the decoder, the second input of which is connected to the output of the second trigger, the input of the first controlled sequence is connected to a single input of the first trigger, the input of the second controlled the sequence is connected to the single input of the second trigger, the first output of the decoder is connected to the installation inputs of the first and second counters in the unit, the second output of the decoder is connected to the first input of the first OR element, the second input of which is connected to the output of the first single vibrator, the output of the first OR element to the reset input the second counter, the third output of the decoder is connected to the first input of the second element OR, the second input of which is connected to the output of the second one-shot, the output of the second element OR is connected to the reset input of the first counter; the fourth output of the decoder is connected to the second inputs of the first and second groups of control inputs of the selector. 13 A A 1U P P A A