User guide

FireWire
STINGRAY Technical Manual V4.4.4
37
1394b bandwidths
According to the 1394b specification on isochronous transfer, the largest
recommended data payload size is 8192 bytes per 125 µs cycle at a band-
width of 800 Mbit/s.
For further details read Chapter How does bandwidth affect the frame rate? on
page 253.
Requirements for PC and 1394b
One Stingray camera connected to a PC’s 1394b bus can saturate the standard
PCI bus.
1394b also requires low latency for data transmission (due to small receive-
FIFO). In order to get the most out of your camera-to-PC configuration, we
recommend the following chipsets for your PC:
• For Intel-based desktops, chipset 945 (or higher)
• For non-Intel based desktops (e.g. AMD), PCI Express compatible chip-
set
Note

The bandwidth values refer to the fact:
1 MByte = 1024 kByte
Note

Certain cameras may offer, depending on their settings in
combination with the use of AVT FirePackage higher
packet sizes.
Consult your local dealer's support team, if you require
additional information on this feature.
Note

How to extend the size of an isochronous packet up to
11.000 byte at S800:
• see register 0xF1000048, ADV_INQ_3, Max IsoSize [1]
in Table 130: Advanced register: Advanced feature inquiry
on page 298
• see Chapter Maximum ISO packet size on page 322
www
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For more information:
http://support.intel.com/support/chipsets/#desktop