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IEEE 1394 Fundamentals and Interface Overview 57Chapter 4
Chapter 4
IEEE 1394 Fundamentals and
Interface Overview
Using this Chapter
This chapter contains reference information on the IEEE 1394 Serial Bus,
the data transfer protocol, and on the related hardware. The contents of the
chapter include:
• IEEE 1394 Topology and Terminology . . . . . . . . . . . . . . . . 57
• IEEE 1394 Data Transfer Protocol . . . . . . . . . . . . . . . . . . . . 59
• The Adaptec
®
AHA-8940 Host Adapter and Interface Cable61
• The HP E8491A PC to VXI Interconnect. . . . . . . . . . . . . . . 62
• The HP I_O Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
IEEE 1394 Topology
and Terminology
Optimizing the IEEE 1394 bus must include an understanding of the
topology and terms associated with its use. Figure 4-1 shows a VXI system
consisting of a PC and three VXI mainframes - interconnected with the IEEE
1394 bus.
Figure 4-1. IEEE 1394 Topology and Terms.
parent child
child
VXI mainframe 1 VXI mainframe 3
VXI mainframe 2
PC w/ IEEE 1394-to-PCI
host adapter
HP E8491A IEEE 1394
to VXI interconnect
root
node
branch
node
leaf
node
leaf
node
hop
hop
hop