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1
Content available Safety of single-channel railway traffic control
Pniewski Roman
Problemy Kolejnictwa
|
2020
|
Z. 186
125--131
EN
Reversible gates enable the creation of fault tolerant digital devices. The application of these gates allows safe control systems to be realized. At present, control systems based on relays are being replaced by systems based on computer technology. This technology allows the implementation of safe systems. Because this system is composed of many elements, it is very difficult to obtain a high safety level for it. The application of reversible logic in the synthesis of digital systems constitutes an alternative approach. The paper presents reversible gates along with examples of their usage in the synthesis of digital systems. The main advantage of reversible logic is the possibility of synthesis of self testing and fault tolerant circuits. The application of circuits based on reversible logic allows safe control systems to be developed. The paper also presents a proposal for the application of reversible logic in simple control systems.
2
Content available The Algorithm for Reversible Circuits Synthesis
Skorupski Andrzej, Gracki Krzysztof
International Journal of Electronics and Telecommunications
|
2020
|
Vol. 66, No. 2
281--286
EN
In this paper the new synthesis method for reversible networks is proposed. The method is suitable to generate optimal circuits. The examples will be shown for three variables reversible functions but the method is scalable to larger number of variables. The algorithm could be easily implemented with high speed execution and without big consuming storage software. Section 1 contains general concepts about the reversible functions. In Section 2 there are presented various descriptions of reversible functions. One of them is the description using partitions. In Section 3 there are introduced the cascade of the reversible gates as the target of the synthesis algorithm. In order to achieve this target the definitions of the rest and remain functions will be helpful. Section 4 contains the proposed algorithm. There is introduced a classification of minterms distribution for a given function. To select the successive gates in the cascade the condition of the improvement the minterms distribution must be fulfilled. Section 4 describes the algorithm how to improve the minterms distributions in order to find the optimal cascade. Section 5 shows the one example of this algorithm.
3
Content available The Transforming Method Between Two Reversible Functions
Skorupski Andrzej, Gracki Krzysztof
International Journal of Electronics and Telecommunications
|
2019
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Vol. 65, No. 1
33--38
EN
This paper presents an original method of designing some special reversible circuits. This method is intended for the most popular gate set with three types of gates CNT (Control, NOT and Toffoli). The presented algorithm is based on two types of cascades with these reversible gates. The problem of transformation between two reversible functions is solved. This method allows to find optimal reversible circuits. The paper is organized as follows. Section 1 and 2 recalls basic concepts of reversible logic. Especially the two types of cascades of reversible function are presented. In Section 3 there is introduced a problem of analysis of the cascades. Section 4 describes the method of synthesis of the optimal cascade for transformation of the given reversible function into another one.
4
Content available The Method of Reversible Circuits Design with One-gate Prediction
Skorupski A.
International Journal of Electronics and Telecommunications
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2018
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Vol. 64, No. 4
535--540
EN
This paper presents an original method of designing reversible circuits. This method is destined to most popular gate set with three types of gates CNT (Control, NOT and Toffoli). The presented algorithm based on graphical representation of the reversible function is called s-maps. This algorithm allows to find optimal or quasi-optimal reversible circuits. The paper is organized as follows. Section 1 recalls basic concepts of reversible logic. Especially the cascade of the gates as realization of reversible function is presented. In Section 2 there is introduced a classification of minterms distribution. The s-maps are the representation of the reversible functions where the minterms distribution is presented. The choice of the first gate in the cascade depends on possibility of improving the distribution. Section 3 describes the algorithm, namely how to find the optimal or quasi-optimal solutions of the given function.
5
Content available Bezpieczeństwo jednokanałowych układów sterowania zrealizowanych w logice odwracalnej
Pniewski R., Dobrzński M.
Autobusy : technika, eksploatacja, systemy transportowe
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2018
|
R. 19, nr 12
608--610
PL
W artykule omówiony został, opracowany przez autorów sposób kontroli poprawnej pracy układu sterowania wykorzystującego bramki odwracalne. Logika odwracalna pozwala na konstruowanie, odpornych na błędy systemów cyfrowych. Autorzy zaproponowali poprawiona metodę kontroli z dynamiczną zmianą sygnałów kontrolnych, co może w istotny sposób podnieść bezpieczeństwo.
EN
The article discusses the method of controlling the correct operation of a control system using reversible gates developed by the authors. Reversible logic allows you to build fault-tolerant digital systems. The authors proposed an improved control method with a dynamic change of control signals, which can significantly improve safety.
6
Content available Computer aided synthesis of reversible logic in traffic control systems
Pniewski R.
Archives of Transport System Telematics
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2018
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Vol. 11, iss. 3
43--48
EN
Currently traffic control systems in place relay systems used microprocessor systems. A better solution may be the use of reversible logic in the synthesis of digital control systems. The main problem in the design of reversible logic is the transformation of the description of the system from the form of Boolean equations to the reversible form. The article presents error-proof reversible gates and software supporting the automatic synthesis process. The presented programs were developed and launched by the author of the article. The article presents the algorithms used to describe the description of circuits. The results of the programs’ operation and results of simulation of systems with reversible logic are presented.
7
Content available Graphical Method of Reversible Circuits Synthesis
Skorupski A.
International Journal of Electronics and Telecommunications
|
2017
|
Vol. 63, No. 3
235--240
EN
This paper presents a new approach to designing reversible circuits. Reversible circuits can decrease energy dissipation theoretically to zero. This feature is a base to build quantum computers. The main problem of reversible logic is designing optimal reversible circuits i.e. circuits with minimal gates number implementing the given reversible function. There are many types of reversible gates. Most popular library is a set of three types of gates so called CNT (Control, NOT and Toffoli). The method presented in this paper is based only on the Toffoli gates. A graphical representation of the reversible function called s-maps is introduced in the paper. This representation allows to find optimal reversible circuits. The paper is organized as follows. Section 1 recalls basic concepts of reversible logic. In Section 2 a graphical representation of the reversible functions is presented. Section 3 describes the algorithm whereby all optimal solutions of the given function could be obtained.
8
Modelowanie logiki rewersyjnej w języku VHDL
Pniewski R.
Logistyka
|
2015
|
nr 3
3982--3987, CD 1
PL
Szybkość systemów cyfrowych (w tym nowoczesnych komputerów) ograniczają zjawiska związane ze stratami energii i wydzielaniem ciepła. Rozwiązaniem alternatywnym jest wykorzystanie logiki rewersyjnej w syntezie systemów cyfrowych. W artykule przedstawiono podstawowe bramki rewersyjne i metody ich modelowania w języku VHDL.
EN
The speed digital systems (including modern computers) limit the phenomena associated with energy losses and heat generation. An alternative is to use a reversible logic synthesis digital systems. The article presents the reversible gates and methods of modeling in VHDL
9
Content available Symulacja układów z logiką rewersyjną w programie QUCS
Pniewski R., Pniewska J.
TTS Technika Transportu Szynowego
|
2013
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R. 20, nr 10
2925--2930, CD
PL
Szybkość systemów cyfrowych (w tym nowoczesnych komputerów) ograniczają zjawiska związane ze stratami energii i wydzielaniem ciepła. Rozwiązaniem alternatywnym jest wykorzystanie logiki rewersyjnej w syntezie systemów cyfrowych. W artykule przedstawiono podstawowe bramki rewersyjne i metody ich modelowania z wykorzystaniem symulatora QUCS.
EN
The speed digital systems (including modern computers) limit phenomena associated with energy losses and heat generation. An alternative is to use in the synthesis of reversible logic digital systems. The article presents reversible gates and methods of reverse modeling of a simulator QUCS.
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