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FSB Clock means CPU external bus clock.
CPU internal clock = CPU FSB Clock x CPU Clock Ratio
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See SMBus.
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IEEE 1394 is a low-cost digital interface originated by Apple Computer as a desktop LAN and developed by the IEEE 1394 working group.
The IEEE 1394 can transport data at 100, 200 or 400 Mbps. One of the solutions to connect digital television devices together at 200 Mbps.
Serial Bus Management provides overall configuration control of the serial bus in the form of optimizing arbitration timing, guarantee of
adequate electrical power for all devices on the bus, assignment of isochronous channel ID, and notification of errors. There are two type of
IEEE 1394 data transfer: asynchronous and isochronous. Asynchronous transport is the traditional computer memory-mapped, load and
store interface. Data requests are sent to a specific address and an acknowledgment is returned. In addition to an architecture that scales
with silicon technology, IEEE 1394 features a unique isochronous data channel interface. Isochronous data channels provide guaranteed
data transport at a pre-determined rate. This is especially important for time-critical multimedia data where just-in-time delivery eliminates
the need for costly buffering.
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