D-to-trigger

 

(57) Abstract:

The invention relates to switching devices and may find application in systems management, control, communication devices, computing devices and other devices in different industries. The technical result is the ability to trigger on the back of the slice control signal and return to the forefront in the presence of the synchronization signal of any duration. For this trigger includes the element and multi-element digital structures. 1 Il.

The invention relates to switching devices and can be used in control systems, control, communication devices, computing devices and other devices in different industries.

Known D-trigger, described, for example, in [1] that contains the actual trigger, consisting of two elements AND NOT with cross-feedback and control circuit, consisting of two elements, containing one-sided feedback.

A feature of this trigger is switching his admission of timing /at the front/ and lock it after receipt of the synchronization signal. However, some digital mouth="ptx2">

Famous J-K-flip-flop, described, for example, in [2] that contains the actual trigger, consisting of two elements AND NOT with cross-feedback and control circuit, consisting of two multi-element digital structures (MACS), covered by cross-feedback.

A feature of this trigger is to switch it at the end of the clock (on the cut). However, some digital devices and systems require switching to the initial state of the trigger when the signal (on the front).

As the prototype is accepted, the device described in [2].

The aim of the present invention is the change in functionality, namely the trigger on the back of the slice control signal and return at the forefront of the signal in the presence of the synchronization signal of any duration.

This goal is achieved by the fact that D-K-trigger contains the actual trigger, consisting of two elements AND NOT containing a cross-feedback and control circuit, consisting of a single element MACS and one element AND NOT feedback. Item MACS has information (enable) input D and engraved C, and an AND-NOT circuit control is bretania illustrated in the drawing, where the drawing shows a diagram D-K-flip-flop.

D-K-trigger contains the actual trigger, consisting of two-input of the first 1 and second 2 elements AND IS NOT, and the control circuit, consisting of MASS 3 and the third circuit AND NOT 4. The direct output Q input element AND NOT 1 is connected feedback to the first input of two-input element AND NOT 2, and the inverted output of two-input element AND NOT 2 is connected feedback to the first input of two-input element AND NOT 1. The control circuit contains an element MASS 3, the output of which is connected with the second input element AND NOT 1, and item AND NOT 4, the output of which is connected with the second input element, AND-NO 2, item MASS 3 has the information (enable) input D and engraved C. the Element AND-NOT 4 has an informative /W/ log K, and the second input is the feedback from the direct output Q of element AND-NOT 1. D-K-flip-flop has two outputs - direct Q and inverted .

A trigger that contains a control circuit composed of an element MASS and element AND-NOT having feedback from the direct output Q of the trigger, the sources are not detected.

The D-K-flip-flop is in the following sequence. In the initial state, the control signals D=0, C=0, K=0. The output of the trigger somastostatin at the outputs of the control circuit /MACS and AND-NOT/ there are a few isolated signals, supports output signals trigger Q=0, =1. The appearance of the signal K=1, the state of the circuit does not change.

Upon receipt of the information signal D=1 element MASS 3 does not change its output signal, but granted permission to switch sync, C. admission and completion of the synchronization signal C /cutoff/ output element MASS 3 appears short-zero signal, the switching element AND-NOT 1 to Q=1, and through cross-feedback - switching element AND-NOT 2 status =0. When this element AND NOT 1 is held in an enabled state /Q=1/ signal =0. The re-emergence of the signals C=1 or C=0 will not change the state of the trigger, i.e. the trigger is locked. Off the trigger signals K=1 /front/. This sets the zero signal at the output of AND-NOT 4 and an AND-NOT 2 switches /returns/ status =1 and the element AND NOT 1 by the cross-feedback - in the state Q=0.

Thus the proposed D-K-trigger fires on the slice clock and cambiocorsa in srabotanno state, and turns off the switching-off unit with signal /front/ filed off on the log K. In the absence of authorizing edinichnogo the electronic circuits digital device. - M.: Soviet radio, 1973, S. 55, 56, Fig. 2.9 A.

2. Agajanian T. M., Plekhanov, S. P. Integral triggers automation devices. - M.: Mashinostroenie, 1978, S. 24 - 28, Fig. 1.15.

D-K-a trigger that contains the direct and inverted outputs, allowing synchronous and off inputs, the control element of the first input element AND IS NOT, first and second input elements AND NOT with cross-feedback made by connecting the output of the first element AND NOT with the first input of the second element AND-NOT and the output connection of the second element AND to the first input of the first element AND the second input of the third element AND IS NOT connected to the feedback of the output of the first input element AND-NOT, the output of the third element AND IS NOT connected with the second input of the second input element AND-NOT, characterized in that the control element of the first element AND IS NOT applied to multi-element digital structures, the first input of which is permissive, and the second input - synchronous, the output of the multi-element digital structures connected with the second input of the first element AND the first input of the third element AND is NOT off the entrance.

 

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