SU834856A2 - Synchronizing-signal generator - Google Patents

Description

(54) SYNCHROIMPULSE GENERATOR

I

The invention relates to a pulse technique and can be used in computing.

According to the main author. St. No. 714632 is known a generator of clock pulses, containing the elements of OR-NOT, delay lines with taps, blocks of elements AND, one-shot 1.

However, in the known device, simultaneous launching of one-shot and unlocking of the elements OR-NOT is possible, which leads to a decrease in the noise immunity of the generator.

The purpose of the invention is to improve noise immunity.

This goal is achieved by the fact that a sync pulse generator containing an OR-NOT element, the output of which is connected to the input of the first delay line with taps, whose taps are connected through the first block of elements AND to the inputs of the one-oscillator, the first output of which is connected to the first input of the OR element. , the second delay line with taps, the taps of which are connected to the first inputs of the second block of the AND block, the second inputs of which are connected to the frequency control, the phase control bus, the additional element OR NOT and the one-shot, the first od coupled to a first input of the additional OR-NO element whose output is connected to the input of a second tapped delay line, an additional monostable inputs connected to the outputs of the AND unit, wherein BfopoH odnovibr Ator additional output coupled to the second input

the main element OR NOT, the second output of the main one-shot is connected to the second input of the additional element OR NOT, and the second inputs of the first block of AND elements are connected to the frequency control bus,

this third inputs of the OR-NOT elements and the control inputs of the one-shot are connected to the phase control, a trigger is entered, the outputs of which are connected to the additional inputs of the elements-OR, respectively, and the trigger inputs are connected to the outputs of the one-shot.

Claims (1)

The drawing shows a structural electrical circuit of the generator. The generator of sync pulses contains elements 1 and 2 OR-NOT, lines 3 and 4 delays with taps, blocks 5 and 6 elements And, one-shot 7 and 8, bus 9-14 frequency control, bus 15 phase control, bus 16 "Start, bus 17 "Stop, output buses 18 and 19, trigger 20. The drawing also shows the implementation of one-shot consisting of trigger 21, 22 and lines 23 and 24. The generator works as follows. In the initial state, the single vibrators 7 and 8 are in the standby mode, i.e. the triggers 21 and 22 are set to the zero state, the unit levels from the outlets of the lines 23 and 24 of the delays of the single vibrators 7, 8 block the elements I and 2 OR NOT. On the frequency control buses 9-14, one of the possible signal combinations is set, on the phase control buses 15, Start 16 and Stop 17 are zero levels. trigger 20 may be in any state. The generator starts to work on the rising edge of the "Start from bus W" signal and is an impulse, the duration of which should be sufficient for a stable triggering of the trigger 21,22 single vibrators 7, 8, but should not exceed the duration of the sync pulse. 2 OR NOT, the standby mode of the one-shot 7 and on the output bus 18 a sync pulse of the first sequence appears. The signal from the output bus 18 confirms the blocking of element 2 OR-NOT, the standby mode of the one-shot 7, and sets to zero the trigger 20, the direct output of which unlocks the element 1 OR-NOT, and the inverse locks the element 2 OR-NOT. After a time equal to the value of the delay line 23 of the one-vibrator delay 8, the zero level from its output switches the one-vibrator 8 into standby mode and in parallel through element 1 OR NOT, the delay line 4 with taps and one of the elements AND block 6 starts the one-shot 7, on the output bus 19 appears in the second sequence clock. The signal from the output bus 19 blocks element 1 OR NOT. After some time equal to the delay line 23 of the delay, the zero level from its output switches the one-shot 7 into standby mode and in parallel through element 2 OR-NOT, line 3 of the delay, with taps and one of the elements AND block 5 starts the one-shot 8 and to the output bus 18 appears the second clock pulse of the first sequence. Further, the generator operation is repeated. The generator is stopped by a signal from the bus 17 "Stop. To change the frequency of the sync pulses, it is sufficient to send the corresponding combination of signals from 9–14 frequency control. The phase change is carried out in step 6) from the bus K to start or from the band 15 controlling the phase of the signal, which is a pulse, the duration of which should be sufficient for a stable triggering of the flip-flops 21 and 22 of the one-shot 7 and 8, but should not exceed the duration of the sync pulse. The signal, taken from strip 16, establishes a phase corresponding to the beginning of the clock pulses of the first output sequence, regardless of the previous phase. But the signal removed from bus 15 is set to a phase corresponding to the start of the clock of the second output sequence, regardless of the previous phase. The invention of the generator of sync pulses by author. St. No. 714632, characterized in that, in order to increase the noise immunity of the generator, a trigger is introduced into it, the outputs of which are connected to the additional inputs of the or-NOT elements, respectively, and the trigger inputs are connected to the outputs of the single vibrators. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 714632, cl. H 03 K, 1980.