July 2003
Intermediate to advanced
576 pages
11h 51m
English
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8.2. 1394-1995 Cable Physical Layer Attributes
The 1394 shielded twisted pair cable-based physical layer can be characterized by its packet format, transceiver circuit, DATA/STROBE line code, and PSDs.
8.2.1. Packet Formats
There are three types of packets exchanged between FireWire transceivers. There are physical layer packets used during initialization and link management, primary packets for carrying asynchronous and isochronous data, and an acknowledge packet for reception of asynchronous packet acknowledgment. The general format of the physical layer packet is shown in Figure 8.15. The first 4 bytes of a physical layer packet consists of a packet type of 2 bits, a physical_ID of 6 bits, and a body of 3 bytes. The last 4 bytes of a physical ...
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