SU1649546A1 - Paraphase flip-flop - Google Patents

Abstract

The invention relates to computing and can be used in the construction of discrete systems with increased reliability. The purpose of the invention is to increase the reliability of the trigger. The goal is achieved using the elements AND 1.3, 4.9-11, elements OR 2.5, adders 6-8 modulo two and element 18. The trigger allows you to detect erroneous combinations of 00 or 11, arriving at its inputs 12 , 13 and 14, 15, as well as constant malfunctions of the elements included in its composition. 2 Il.

Description

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The invention relates to computing and can be used in the construction of discrete systems with increased reliability.

The purpose of the invention is to increase the reliability of the trigger.

FIG. 1 shows a functional diagram of a paraphase trigger; in fig. 2 is a table of the state of the paraphase trigger failure function.

The paraphase trigger (Fig. 1) contains the fifth element AND 1, the first element OR 2, the fourth and sixth elements AND 3 and 4, the second element OR 5, adders 6-8 modulo two, the first, second and third elements AND 9-11, bit 12 and 13 of the single-input para-phase trigger, bits 14 and 15 of the zero para-phase trigger input, the 16 and 17 paraphase trigger outputs, the HE element 18, the operation mode input 19, and the paraphase trigger installation input 20.

The trigger works as follows.

Before starting, a control signal is applied to the input 20 of a paraphase trigger. The operation of the trigger in good and bad conditions is represented using the table of fault functions in FIG. 2. Input actions with a weight state of 0,1,2,3,4,7,8,11,12,13,14,15 are prohibited for the trigger. When they arrive, adders 6 and 7 modulo two form at outputs 16 and 17 of the paraphase trigger code 00, which indicates the arrival of these prohibited input actions or the occurrence of a malfunction in the trigger elements. If faults occur in the trigger elements at its outputs 16 and 17, a code 111 may be generated. A sign of the correct functioning of the trigger is the formation of code 01 at its outputs 16 and 17. The table of fault functions (Fig. 2) is compiled for the case when the input actions are received in the following sequence: 5,6,9,10. A fault like the constant 0 of the element And 1 appears at the outputs 16 and 17 of the paraphase trigger in the event that the trigger is in the one state (q 1, qa 0), and for its transfer to the zero state the input action is applied with weight

50

five

„5 0 5

0

five

6, Faults of the type of the constant O of elements 3 and 4 appear at the outputs 16 and 17 when the input action is applied with a weight state of 5 and with the command Set to O at input 20. Correctness of the operation of adders 6 and 7 modulo two, and elements AND 9-11 is checked by supplying input actions with a weight state 1 and 8. Testing the modulo two modulator 8 operation, the element NO 12 and element And 9 is performed by applying an input influence with a weight state 6 and controlling action input, 19 para-phase trigger.

The invention provides an increase in the reliability of the trigger due to the formation of a code T or на 11 at the trigger output when incoming inputs are blocked at its inputs or when faults of the constant 0 or constant 1 type occur in the trigger itself. The reliability of the operation increases by an amount proportional to the probability of the occurrence of such faults. In addition, an increase in the testability of the trigger is achieved by ensuring that all possible single faults of constant type 0 and 1 are fixed at the outputs of the trigger elements.

Claims (1)

Invention Formula A paraphase trigger containing three adders modulo two and five elements AND, the first and second inputs of the first modulo adder two being connected respectively to the first and second bits of the single input ... paraphase trigger, the first and second inputs of the second modulo two are connected respectively to the first and second bits of the zero input of the paraphase trigger, the outputs of the first, second and third modulators two are connected to the corresponding inputs of the first And element, the output of which is connected to the first inputs of the second and the third And elements, the outputs of which are respectively the direct and inverse outputs of the paraphase trigger, characterized in that, in order to increase the reliability of the trigger, it introduced e NOT, two elements OR and the sixth element AND, and the outputs of the fourth and the fifth elements AND are connected to the first inputs of the first and second OR elements, respectively, whose outputs are connected to the second inputs of the second and third AND elements, respectively, the second input of the first OR element is connected to the first discharge of the single input of the pair-phase trigger, the output of the first OR element is connected to the first input of the third adder about module two and the first input of the fourth element I, the second input of which is connected to the second section of the zero input of the paraphase trigger, the first and second inputs of the fifth element AND respectively connected to the first bit of 1649546 the left and second bits of the single inputs of the paraphase trigger, the output of the sixth element AND is connected to the second input of the second OR element, the output of which is connected to the second input of the third modulo-two adder and the first input of the sixth element And, the second input of which is connected to the second PWD discharge the single input of the para-phase trigger, the third input of the second element OR is connected to the installation input of the paraphase trigger, the input of the operation mode of the paraphase 5 trigger through the element is NOT connected to the third inputs of the fifth and sixth elements I.