SU1361558A1 - Device for checking pulse sequence - Google Patents

Abstract

The invention relates to computing and may be used in digital information processing devices for controlling a pulse train. A distinctive feature of the device is that it restores the missing pulses. The aim of the invention is to increase the reliable - control. The delivered chain is removed due to the introduction of the element AND 7, the second element OR 9 and the SECOND one-shot 8. 8 ill. (L

Description

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The invention relates to computing and can be used in digital information reversing devices for controlling pulse sequences.

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

Figure 1 presents the block diagram of the device; figure 2 - timing diagram of the device.

The device contains an element 1 delayed element OR 2, an input 3 of a controlled sequence, an output 4 of a controlled sequence, a one-shot 5, an exit 6 off, an element AND 7, a one-shot 8 and an element OR 9,

The device works as follows.

The pulses of the controlled sequence from input 3, which follow with a period equal to T, go to the inputs of the element OR 2 and 9, as well as to the input of the one-shot 8 with repeated

the start, the period of instability of which is chosen equal to T, where T is the period of controlled sequence of pulses. From the output of the OR 2 element, the pulses of the controlled sequence pass to the output 4 of the device and to the input of the first one-shot 5 with a restart, the instability period of which is chosen equal to a value greater than T but less than 2T. From the output of the OR 9 element, the pulses of the input sequence pass to the input of the delay element 1, the delay value of which is chosen so that the signal passing time from the input 3 of the device through the OR element 9, the delay element 1 and the AND 7 element at the input of the OR element 2 It is a value of T. With a normal flow

With the arrival of the first pulse of the monitored sequence, the single-vibrator 5 is set to one state and a logic zero level is formed at its inverse output. Since the period of instability of the one-shot 5 is longer than the period of the pulse sequence, it remains in a neglected state for the entire period of time in the sequence of the pulse sequence. In the case of establishing at the input 3 of the device a level of logical unity or failure of any element of the device leading to the disappearance of the output 4 of the device of the pulse sequence, the one-shot 5 returns to its original state

pulses to the input 3 of the device. On the other hand, the second one-vibrator 8 is triggered at the inverse output to the front edge of the pulse, the inverse output of which blocks the passage of the pulse from the output of delay element 1 through element 7. At the output 4 of the device through element SHSh 2 pass the input sequence pulses. A single vibrator 8, blocking the passage of pulses from the output of delay element 1 to the entry of element SH 9 through element 7, thus breaks the feedback from the output of delay element 1 to its input and warns of possible expansion 55

one-shot 5 sets the level of the logical unit, which is an error signal.

The ka of FIG. 2 shows the time diagrams of the device operation under the assumption that the input pulse sequence terminates at the sixth pulse and at the same time moment there arises a malfunction of the delay element, i.e. the pulse sequence at the device output disappears. In the input sequence, in addition, there are no fourth and fifth

rhenium pulses of the input sequence due to the combination on the second element OR 9 pulses of the input sequence and delayed for the period T pulses transmitted through the delay element 1, due to minor deviations of the delay in the feedback circuit. In case of disappearance

any number of pulses of the input sequence due to the failure of the p-voltage in the generator of the controlled sequence of pulses of the one-vibrator 8 through the gap

a time equal to the period T from the moment of the start of the last pulse arriving at input 3 of the pulse goes into the initial state and restores feedback from the output of delay element 1 through AND 7 to input of OR 9 and further to input of delay 1. At the same time, at the output 4 of the device, the sequence of pulses is maintained by keeping it in the feedback circuit.

With the arrival of the first pulse of the monitored sequence, the single-vibrator 5 is set to one state and a logic zero level is formed at its inverse output. Since the period of instability of the one-shot 5 is longer than the period of the pulse sequence, it remains in a neglected state for the entire period of time in the sequence of the pulse sequence. In the event that a unit level is established at the input 3 of the device or if any element of the device fails leading to a pulse sequence at the output 4 of the device, the one-shot 5 returns to its original state

this is, in the case of inverse output

50

45 current, at the same time on the inverse output

55

one-shot 5 sets the level of the logical unit, which is an error signal.

The ka of FIG. 2 shows the time diagrams of the operation of the device under the assumption that the input pulse sequence terminates at the sixth pulse and at the same instant of time a malfunction of the delay element occurs, i.e. the pulse sequence at the device output disappears. In the input sequence, in addition, there are no fourth and fifth

pulses that are recovered by the device. The pulses from the output of the delay element are shown slightly shifted to the left, to show that, having passed through the AND element, they fall into the desired time interval.

Claims (1)

Invention Formula A device for controlling a sequence of pulses, containing a delay element, a first SHS element and a first one-shot, the input of the monitored sequence of the device connected to the first input of the delay, and the output of the AND element element OR, the output of which is co-.c the second inputs of the first and second It is united with the input of the first one-vibrato-elements OR, the output of the second element is controlled by the output, that the CM is connected to the input of the element of the sequence of the device, the interface. Bjfodd arranges hi) (od element By BbiKod devices You move 6 cSof devices The 1st output of the first one-shot is the output of the device, characterized in that, in order to increase the reliability of the control, an AND element, a second OR element and a second one-vibration device are inserted into the device, and the input of the controlled sequence of the device is connected to the first input of the second: Element OR with the input of the second one-shot, the inverse output of which is connected to the first input of the element And, the second input of which is connected to the output of the element ig, 2