ARINC 629 was launched in May 1995 and is currently being used on aircraft such as the Boeing 777, Airbus A330, and A340. To learn more about the “ARINC 629 Digital Data Bus Specifications”, click on the link, https://www.logic-fruit.com/blog/arinc-standard/arinc-629-digital-data-bus-specifications/ About Logic Fruit Technologies Logic Fruit Technologies is a product engineering R&D & consulting services provider for embedded systems and application development. We provide end-to-end solutions from the conception of the idea and design to the finished product. We have been servicing customers globally for over a decade. The company has specific experience in various fields, such as -FPGA Design​​​ & hardware​​​ design -RTL​​​ IP Design -A variety of digital protocols -Communication buses as1G, 10G Ethernet -PCIe​​​ -DIGRF​​​ -STM16​​​/64 -HDMI​​​. Logic Fruit Technologies is also an expert in developing, -software-defined radio (SDR) IPs -Encryption -Signal generation -Data analysis, and -Multiple Image Processing Techniques. Recently Logic Fruit technologies are also exploring FPGA acceleration on data centers for real-time data processing. **Our Social Media Channels** Facebook: https://www.facebook.com/LogicFruit/ ​​​Twitter: https://twitter.com/logicfruit​​​ LinkedIn: https://www.linkedin.com/company/logi… Website: https://www.logic-fruit.com/​​ #LFT​​​ #LogicFruitTechnologies​​​ #LogicFruit​ Interested to view more Slide Shares, Click on the below links, https://www.slideshare.net/LogicFruit/afdx https://www.slideshare.net/LogicFruit/end-system-design-parameters-of-the-arinc-664-part-7 https://www.slideshare.net/LogicFruit/compute-express-link-cxl-everything-you-ought-to-know https://www.slideshare.net/LogicFruit/a-designers-practical-guide-to-arinc-429-standard-3pptx https://www.slideshare.net/LogicFruit/a-swift-introduction-to-milstd https://www.slideshare.net/LogicFruit/arinc-the-ultimate-guide-to-modern-avionics-protocol

1. ARINC 629 Digital Data
Bus Specifications.
*This presentation is the intellectual property of Logic Fruit Technologies . Any plagiarism or misuse is
punishable according to Indian Laws.
October 2022

2. ARINC 629 was launched in May 1995 and is currently being used on aircraft such as the
Boeing 777, Airbus A330, and A340. The specification is based upon the Digital Autonomous
Terminal Access Communications (DATAC) development work of Boeing Commercial Aircraft.
This ARINC bus is a true data bus in that the bus functions as a multiple-source, multiple-sink
system. That is, every terminal on the data bus will send data to and receive data from every
other terminal. This enables the sharing of data between units in the avionics system to be
much more flexible. It supports a 2 Mbps data rate. m
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3. This ARINC bus is a true data bus in that the bus functions as a multiple-source, multiple sink system. That is,
every terminal on the data bus will send data to and receive data from every other terminal. This enables the
sharing of data between units in the avionics system to be much more flexible. It supports a 2 Mbps data rate.
ARINC 629 protocol is a time-based, collision-avoidance protocol in which a fixed time slot is allotted to each
terminal to access the bus and transfer data to the bus. By using multiple control timers embedded in the bus
interfaces, each terminal will autonomously determine when the appropriate time slot is available and transmit
the necessary data.
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 Word format:
 Label Word:
 Data Word:

4. Data Types supported
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Binary Number Representation (BNR): BNR coding stores data as a binary number. The BNR is the most
efficient in terms of bus power and should typically be used. With Bit 19, the BNR Numeric Data Word Sign
should be encoded. In data bit 19, negative BNR numbers are encoded as the two complements of positive
values by the negative sign denoted as logic 1.

5. Protocol Aspects
The key advantages of a multi-transmitter data bus include the ability to use fewer wires to pass more
information at higher speeds between LRUs. Typically, they are more robust and have an architecture
throughout the development phase that is more conducive to integrating complex systems. These
features translate into an improved economy and increased power for commercial aircraft customers.
ARINC 629 couplers and data bus assemblies are placed together in panels in modern aircraft. During
repairs, this enables faster access. The majority of coupler panels are covered; this also provides the
couplers and bus cable assembly with protection from physical damage. Of the 11 data buses, nine are all
couplers and the entire assembly of the data bus is entirely contained within a panel.
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6. Want to know more?
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about the ARINC 629 Digital Data Bus
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