SU375795A1 - SELF-CORRECTIVE TRIGGER WITH COUNTABLE ENTRANCE ON POTENTIAL ELEMENTS "AND –NE" - Google Patents

Description

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The invention relates to discrete automation and computing devices and is intended to be implemented in the system of potential AND-NOT logic elements.

Devices are known that contain primary, auxiliary, and auxiliary triggers with separate inputs, control elements, and a correction unit.

The known devices have a low correction ability, the output waveform of these devices depends on the delay of the elements “AND-NO.

The purpose of the invention is to increase the reliability and expand the use of the device.

This is achieved in that it contains two additional control elements. Node correction in it is made on four elements. The inputs of the first additional control element are connected to the direct outputs of the main and additional triggers and the direct input of the auxiliary trigger a, and its output to the input of the control element of the inverse input of the main trigger. The inputs of the second additional control element are connected to the inverse outputs of the main and auxiliary triggers and the inverse input of the auxiliary trigger, and its output is connected to the control input

element of the direct input of the main trigger. The direct output of the main trigger is connected to the inputs of the first and third elements of the correction node, the direct output of the auxiliary trigger to the inputs of the first and second elements of the correction node, the direct output of the additional trigger to the inputs of the second and third elements of the correction node. The outputs of the first, second, third elements of the correction node are connected to the inputs of its fourth element, the output of which is the trigger output.

The drawing shows a functional diagram of the proposed device and a state diagram.

The device includes triggers 1, 2, 3 with separate inputs, each of which consists of two elements "AND-NO 4-13.

To describe the operation of a device, its status is indicated by a sequence of three binary digits.

The first digit indicates the signal at the left trigger output 1, the second at the left trigger output 2, the third at the left trigger output 3. For example, the input signal is zero and the device is in the state 000. In this state, at the outputs of the elements 4, 5 , 6, 8, 9 there are single signals; the output of element 7 is a zero signal. The output signal of the circuit is also zero. If in this state the triggers / or 3 fail, then the device goes to state 100 or 001, respectively, however, the output signal will still remain zero. Trigger 2 fails to occur in this state, since it is held in the zero state by a signal from the output of element 7, which does not depend on the state of trigger 2. When the input signal changes, the device goes to the correct state 101 and no longer needs in correction. The output signal becomes one. In state 101, only trigger 2 fails. In this case, the device goes to state 111, but the output will still be single. The failure of the Y triggers and in the 101 state cannot occur, as they are; held by the zero signal from the output of element 4, which does not depend on the states of these triggers. Similarly, you can trace the operation of the device in all other cases. In the drawing, this is schematically shown in the form of a state diagram. The solid lines show the correct trajectory of the circuit movement under the action of the input signal, the dotted lines show the jumps of the device circuit during a fault and subsequent changes in the states when the input signal changes. The numbers of the flip-flops are recorded on the side of the vertical lines, when the device fails, it goes into the state indicated by the arrow, and the input signal values are recorded above the vertical lines. Elements 10-13 form a correction scheme. Signals to these elements are provided from triggers. Since the change in the states of the triggers occurs simultaneously, there is no delay between the input signals of the correction circuit, and the output signal of the device is not distorted. The subject of the invention is a self-correcting trigger with a counting input on potential elements "AND NOT, containing main, auxiliary and additional triggers with separate inputs, control elements and a correction unit, characterized in that in order to increase the reliability of work and expand the range of use, it contains two additional control elements, and the correction unit in it is made on four elements, with the inputs of the first additional control element connected to the direct outputs of the main and additional tion and trigger direct input of the auxiliary flip-flop, and the output - to the input of the control element novnogo inverting input trigger; the inputs of the second additional control element are connected to the inverse outputs of the main and additional triggers and the inverse input of the auxiliary trigger, and its output to the input of the control element of the direct input of the main trigger; the direct output of the main trigger is connected to the inputs of the first and third elements of the correction node, the direct output of the auxiliary trigger to the inputs of the first and second elements of the correction node, the direct output of the additional trigger to the inputs of the second and third elements of the correction node; the outputs of the first, second, third elements of the correction unit are connected to the inputs of its fourth element, the output of which is the output of the trigger.