SU1205258A1 - Device for generating pulse bursts - Google Patents

Abstract

The invention relates to a pulse technique and can be used in control devices and information processing. The purpose of the invention is to expand the functionality by forming additional output pulses of -Fs Cr g r before the start of the burst of pulses and after its termination and blocking the operation of the entire device when the number of pulses is set to zero. The goal is achieved by introducing into a known device a Johnson counter, an EXCLUSIVE OR element and an I. Element. The device contains a source of control pulses 1, a Johnson counter 2, a pulse counter 3, output buses 4.8 and 11, a logical element AND 5 and an EXCLUSIVE OR 7, an inverter 6, a source of binary information 9, a clock pulse generator 10. The operation of the device is explained in the description of the invention in timing diagrams. Fig.2 with . "(L JJJo / g -08

Description

The invention relates to a pulse technique and can be used in control devices and information processing.

The aim of the invention is to extend the functionality by forming additional output pulses before and after the start of the packet and blocking the operation of the entire device when the number of pulses is set to zero.

Fig. 1 shows a functional diagram of an apparatus for generating pulse bursts; Fig. 2 shows timing diagrams explaining the operation of the device.

A device for generating bursts of pulses contains a source of control pulses 1 connected to the initial setup of the Johnson counter 2, the first output of which is connected to the control input of the counter of 3 pulses, the second output is connected to the output bus 4, the third output is combined with the first input the element AND 5 and through the inverter 6 with the first input of the element EXCLUSIVE OR 7, and the fourth output is connected to the output bus 8 and the input interrupt of the source 1 control signals, the inputs of parallel recording (informational) counter 3 impulses All bits are connected to the binary source 9, the output of the reverse transfer of the pulse counter 3 is connected to the second input element AND 5 and the second input of element 7 EXCLUSIVE OR, the counting input of the Johnson counter 2 is connected to the output of the generator 10 clock pulses and to the third input of the element AND 5 The output of which is connected to the output bus 11 and to the subtractive input of the counter of 3 pulses, the output of the EXCLUSIVE OR 7 element is connected to the resolution enable input of the Johnson counter 2

A device for separating a burst of pulses operates as follows

In the initial state, at the first input of Johnson's counter 2 (Fig. 2d) there is a single signal, and on the remaining outputs (Fig. 2) there are zero signals, since from the output of the source 1 control pulses a single level arrives - control signal

no (FIG. 2b), which forcibly sets Johnson's counter 2 to the zero state.

A single signal from the first output of Johnson's counter 2 is fed to the control input of the pulse counter 3 and holds it in the parallel recording of information, which from the binary information source 9 is sent to the parallel recording inputs of the counter 3.

If binary information, other than zero, is written to counter 3, then its output is the reverse

of the transfer (FIG. 2z), a single signal is set, which, together with the inverted signal from the third output of Johnson's Counter 2 (Fig 2e), sets the output of element 7 EXCLUSIVE OR (Fig. 2c) to zero the Johnson counter by clock pulses (FIG .2a) generator 10.

To form a burst

from the outputs of the binary information source 9, it is necessary to submit the information of the CRC) corresponding to the number of pulses in the packet, and from the output of the source of 1 control pulses - a zero control signal.

On the nearest leading edge of the clock frequency, Johnson's counter 2 changes its state: a single signal is set at the second output (FIG. 2d), on the next leading edge, the single signal moves to the third output (FIG. 2e). In this case, element 7 EXCLUSIVE OR a single signal is issued, prohibiting the changing of the states of Johnson's counter 2, and element 5 is opened for passing the pulses of the clock frequency of the generator 10. The formation of a burst of pulses begins (hf.2i), the counter 3 counts the leading edges of Pulse in the pack. After the programmed number of pulses at the output of the reverse transfer of counter 3, a zero signal is generated, which closes the element AND 5 and through the element EXCLUSIVE OR 7 removes the prohibition from the resolution enable input of the counter 2 Johnson. On the leading edge of the next pulse

The clock frequency of Johnson's counter 2 switches to the following state :, a single signal from its fourth output (Fig. 2g) is fed to the input

3

interrupting the source of control pulses 1 and interrupting (or resetting, depending on the work program) the control signal by setting (or holding the control signal) the Johnson counter 2 to its initial state. There is a parallel recording into the counter 3 of information on the number of pulses in the next burst, and if this information is different from zero and the control signal is not removed, the work cycle is repeated.

If the information about the number of pulses in the next packet is zero, then at the output of the reverse transfer of counter 3 there will be a zero signal, which through the element of the ACTION-PERSON OR 7 sets the prohibition (single signal) by. Johnson counter 2 count input. In this case, when the control signal is present, the device remains in the initial state, i.e. the device is locked, which is removed only after writing to the counter 3 a code other than zero.

The duration of the signal before the beginning of the pack is equal to one period of the clock frequency.

The duration of the signal at the end of the burst is determined by the time of interruption (or reset) of the control signal from the output of the source 1 control pulses.

The period of the pulse bursts (Tr) consists of the time of the direct formation of the packet (p. T), the time of interruption of the control signal at the end of the packet (t.T.) and the time of formation of the pulse before the beginning of the packet (T), i.e .;

  Gp 11-T1-tT-T,

where T is the period of the next clock

pulses; fi - the number of pulses in a pack

05258

m is the number of periods of the clock frequency required to interrupt the control signal, g For m 1 G-, g-,

5 Tp-Fri gt,

where pT is a variable value, depends on the number of pulses in a pack.

ten

Claims (1)

Invention Formula A device for generating pulse bursts containing a source control signals, a clock pulse generator, a source of binary information, bypass, which is connected to the information inputs of a pulse counter, an inverter, and This is because, in order to expand its functionality, it additionally introduces a Johnson counter, an INCORRECT OR element, and an AND element whose output is. connected to the first output bus and to the subtracting input of the pulse counter, the control input of which is connected to the first output of the Johnson counter, the second output of the The third output of the Johnson counter is connected to the first input of the AND element and through the serially connected element NOT and the EXCLUSIVE OR element to the counting enable input of the Johnson counter, whose installation input is connected to the output of the control signal source, the counter clock input Johnson is connected to the output of the clock pulse generator-and to the second input of the element AND, the third input of which is connected to the second input of the element EXCLUSIVE OR and to the output of the reverse transfer of the counter impu The fourth output of the Johnson counter is connected to the third output bus and to the input of the control signal source. and jnjlJTJT-nJ lJT. JTJ-lJnJT- 6. pgipegigl FIG. g