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Advantages of 1394 Automotive network

Posted: 30 Jun 2009     Print Version  Bookmark and Share

Keywords:1394 standard  Isochronous data  asynchronous 

The 1394 standard covers two types of data communication: isochronous and asynchronous. Isochronous data (video and audio) is guaranteed for timeliness but not for delivery. The very nature of such data makes it useless if it arrives late, but some of the data can be discarded without causing major problems. The 1394 spec has periodic 125-s time slots allocated to send isochronous data.

On the other hand, asynchronous data is guaranteed for delivery, but not for timeliness. This class of data must reach its destination, but the specific timing is not critical. A node resends data if a delivery attempt fails.

This document shows the 1394 protocol stack, consisting of Transaction, Link and Physical Layers. In a 1394 controller IC, the Transaction Layer is implemented in software, the Link Layer is implemented in software or hardware and the Physical Layer is done in hardware.

View the PDF document for more information.





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