SU881756A1 - Device for checking synchronization pulses - Google Patents

Description

The invention relates to computing and can be used in digital computing devices. It is known that a device for controlling a sequence of pulses contains a comparison circuit, an OR circuit, a trigger, delay lines whose outputs are connected to the outputs of a time circuit, to the other inputs of which are connected. trigger l A disadvantage of the known device is that it does not detect excess pulses or interference pulses. A device for controlling a sequence of pulses is known. OR, AND circuit, trigger and delay line connected between the output of the second OR circuit and the zeroing trigger input, the output of the first OR circuit is connected to the counting trigger input, and the output of the second OR circuit is also connected to one of the two-input And 2 inputs. However, this device does not detect the loss of an additional number of pulses and excess pulses or interference pulses. The closest to the technical essence of the invention is a device for controlling a sequence of pulses, containing two OR elements connected by outputs to prohibition elements and to inputs of delay elements that are connected by their outputs to other inputs of prohibition elements connected by their outputs to an output element OR 3j. However, the known device does not distinguish between types of synchronization failures and has a lack of accuracy depending on the stability of the parameters of the delay elements. The purpose of the invention is to expand diagnostic capabilities and improve the accuracy of control. This goal is achieved by the fact that the device for controlling synchronization pulses, which contains the first and second one-shot, element AND and the first element OR, the input of the device's synchronization pulses are connected to the input of the first one-vibration and the first input of element AND, the output of which is connected to the input of the second one-vibration, the outputs of the first and second single vibrators are connected respectively to the first and second inputs 1 of the first OR element, the output of which is the first control output of the device, the output of the first one: Rathore connected to the second input of the first AND gate, a device introduced first and second counters and the second OR gate, the clock pulses input device connected to the counting inputs of the first and second counters, the outputs of the first and second monostable multivibrators are connected with the control inputs; respectively, the first and second counters, the outputs of which are connected respectively to the first and second inputs of the second OR element, the output of the OR element is the second control output of the device.

Figure 1 shows a block diagram of a device for monitoring synchronization pulses; 2 shows diagrams for his work.

The device contains the first one-shot 1, connected by the input to the input of the device synchronization pulses, and the output - to the first input of the AND 2 element, the second input of which is connected to the input of the synchronization pulses, and the output to the input of the second one-vibration 3, the first and second elements OR 4 and 5 , the first and second counters b and 7, connected to the first and second inputs of the second element OR 5, respectively, by the counting inputs, to the input of the device synchronization pulses, and zeroing inputs, to the outputs of the first and second one-and-one 1 and 3 and to the input m first OR 4, respectively.

The device works as follows.

The first input pulse synchronization (see Fig.2A) starts the first one-shot 1 (see Fig.26), the extended pulse from the output of which through the element 2 allows the start of the second one-shot 3 the second input synchronization pulse received at the second input of the element 2 ( see figv). The time required for the formation of the extended pulses by the single vibrators 1 and 3 is chosen to be 1.5-1.8 times the duration of the following synchronization pulses TU. Thus, the first one-shot 1 is started from odd pulses, the second one-shot 3 from even pulses. The output signals of one-shot 1 and 3 have a mutual overlap in time (see Fig.26, c) and summed on the element OR 4, on which is a potential signal (see Fig.2g). In the case of a synchronization pulse, one of the one-shot 1 and 3 will not generate an extended pulse (see Fig. 2b) and at the output of the element OR 4 (see Fig. 2d) and at the output 2 of the device, a signal about the absence of a pulse and a synchronization failure appear.

I Extended pulses from the outputs of one-shot 1 and 3 are fed to

the zero inputs by counter 6 and 7 and remove the zero from them. During the action time of the extended pulse of the first one-shot 1, the first counter 6 counts the synchronization pulses arriving at its clock input from the input bus. During normal synchronization, the counter 6 counts one pulse for the duration of the extended pulse from the output of the first one-oscillator 1. The second counter 7, controlled by the second one-oscillator 3, operates in a similar way. There is no signal at the meter outputs. After the end of the extended pulses of the one-shot 1 and 3, the counters B and 7, respectively, are zeroed in time.

Upon receipt, an extra pulse or an interference pulse, the time of occurrence of which differs from the synchronization pulse synchronization period (for example, see Fig. 2a), the second counter 7, for example, during the extended pulse output from the second one-shot 3, counts two pulses and an interfering pulse) and from its output to the input of the OR 5 element, a signal is received about the failure. It also appears at the output of the OR 5 element and the device output. The first counter works similarly if an extra impulse or impulse of interference appears during the operation of the first one-oscillator D.

A device for monitoring synchronization pulses has wider diagnostic capabilities compared to a known device, since it allows one to distinguish between types of synchronization failures, i.e. it independently generates a signal of unnecessary pulses or interference pulses, and a signal of the absence of any number of synchronization pulses, which facilitates the search for malfunctions and failures in computer synchronization systems. The proposed device has greater accuracy, since it does not depend on the stability of the parameters of one-shot the role of delay elements), the duration of the formed extended pulses of which can be from 1.5 to 1.8 periods of the next synchronization pulses.

In addition, in the proposed device, false information at the output is excluded.

Claims (3)

Invention Formula A device for monitoring synchronization pulses containing the first and second one-shot, element I and the first element OR, the input of the device’s synchronization pulses connected to the input of the first one-shot and the first input of element AND whose output is connected to the input of the second one-shot, the outputs of the first and second one-shot one connected to Responsibly with the first and second inputs of the first OR element, the output of which is the first control output of the device, the output of the first single vibrator is connected to the second input of the first element And, different in that, in order to expand diagnostic capabilities and improve the control accuracy, the first and second counters and the second OR element are entered into the device, and the input of the device synchronization pulses is connected to the counting inputs of the first and second one-vibrators inputs, respectively, of the first and second snetchikov, the outputs of which are connected respectively to the first and second inputs of the second OR element, the output of the OR element is the second control output of the device. Sources of information received in the examination 1. The author's certificate of the USSR 337782, cl. G 06 f 11/00, 1972. 2. USSR author's certificate number 440665, cl. G 06 F 11/00, 1974. 3. USSR author's certificate number 607219, cl. G 06 F 11/00, 1978 (prototype).