1553B总线通信概述

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MIL-STD-1553: An In-Depth Look at the High-Performance 1553B Bus System</


The 1553B</ bus communication protocol, a cornerstone in aerospace technology, is the backbone of real-time, data-intensive systems on aircraft platforms. The SM61580 component harnesses its power through advanced storage management, despite its complex configuration that demands significant development time. One key advantage of 1553B is its ultra-fast response time</, ensuring data integrity with every transmission. At a staggering 1 Mbps data rate, it employs feedback and retransmission error correction, plus command response mechanisms to guarantee flawless data flow.


This high-efficiency bus supports broadcast communication</, facilitated by the BC (Bus Controller) entity. The 1553B architecture consists of BC, RT (Remote Terminal), and MT (Multi-Function Terminal), with direct and transformer-coupled connection options. Each information packet</ is formatted with precision, containing command, status, and data words, each 20 bits long, utilizing the robust Manchester II encoding</ for reliable transmission.


The instruction word</, a crucial component, encodes T/R bits, sub-addresses, data count or control codes, and a parity check. Initiated by BC, it is received by RT, with a clear structure that includes an invalid Manchester header, a 5-bit remote terminal address, a 1-bit send/receive flag, and additional addressing and control fields. Data and status words, on the other hand, convey crucial information such as error detection and system status.


The status word</ holds a wealth of information, with the 11th bit serving as a service request flag. The 12-14th bits are currently reserved for future use, while the 15th indicates whether a terminal has received a broadcast command. The 16th bit acts as a busy signal, signaling whether the terminal is engaged. A 17-bit subsystem fault indicator and a 19-bit terminal error flag round out the critical status elements, with parity checking providing a final layer of data integrity.


The hallmarks of 1553B</ include serial digital pulse modulation, 1 Mbps data rate, 20-bit word structure (16 data bits, 3 synchronization bits, and 1 parity), half-duplex communication, the reliable Manchester II code, and support for messages up to 32 words long. Response times for status requests range from 4 to 12 microseconds, showcasing its real-time capabilities.


With its robust design and efficient operation, the 1553B bus system has become an indispensable part of modern avionics, ensuring reliable and efficient data transmission in the demanding environment of military and commercial aircraft.




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