UDC 621.3
DEVELOPMENT OF A RING HALF-DUPLEX NETWORK FOR DATA EXCHANGE BETWEEN DEVICES IN SCIENTIFIC SPACE EQUIPMENT
K. I. Sukachev, Ph.D. (Tech.), senior researcher IKP-214 Samara University, Samara, Russia;
orcid: 0000-0001-5272-1836; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
D. P. Grigoriev, engineer IKP-214, postgraduate student, Samara University, Samara, Russia;
orcid: 0009-0007-8413-379X; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
D. A. Shestakov, engineer IKP-214, postgraduate student, Samara University, Samara, Russia;
orcid: 0009-0000-1904-98574; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
A. A. Artyushin, engineer IKP-214, master's student, Samara University, Samara, Russia;
orcid: 0009-0003-6118-2178; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
A. V. Rodina, post-graduate student, Samara University, Samara, Russia;
orcid: 0009-0002-3567-7145; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The architecture of the ring (bubble) half-duplex network «IL net» is considered, namely: low network level (circuit implementation of communication line, SIINT data exchange puncture, ring bus controller) and high network level (ring connection of devices). The interface contains a communication line in the form of twisted pair, with transformer isolation between the devices. A feature of the interface is the Manchester signal encoding in terms of increasing noise immunity, adaptive adjustment of data transfer rate, which removes the need for the developer to be tied to single speed for all devices, whether it is a master or a slave. The interface also has bubble bus support, which allows for long-term operability of the communication channel when one of the communication lines breaks. All packets contain a verification frame with a checksum, and data frame is encrypted with a special bit sequence to protect against unauthorized data reading between devices.
Key words: : FPGA, CPLD, Microcontroller, Half-duplex Network, Manchester Code, SAINT, infinite loop, FMU Core, Spacecraft, Scientific Equipment.