Allied Vision Technologies AVT Stingray Instrukcja Obsługi Pobierz pdf (Strona 28)

FireWire

STINGRAY Technical Manual V2.2.0

Image transfer via 1394a and 1394b

Technical detail 1394a 1394b

Transmission mode Half duplex (both pairs needed)

400 Mbit/s data rate

aka: a-mode, data/strobe (D/S)

mode, legacy mode

Full duplex (one pair needed)

1 Gbit/s signaling rate, 800

Mbit/s data rate

10b/8b coding (Ethernet), aka:

b-mode (beta mode)

Devices Up to 63 devices per network

Number of cameras Up to 16 cameras per network

Number of DMAs 4 to 8 DMAs (parallel) cameras / bus

Real time capability Image has real time priority

Available bandwidth acc. IIDC

(per cycle 125 µs)

4096 bytes per cycle

~ 1000q @ 400 Mbit/s

8192 bytes per cycle

~ 2000q @ 800 Mbit/s

(@1 GHz clock rate)

For further detail read Chapter Frame rates on page 203.

Max. image bandwidth 31.25 MByte/s 62.5 MByte/s

Max. total bandwidth ~45 MByte/s ~85 MByte/s

Number of busses Multiple busses per PC

limit: PCI bus

Multiple busses per PC

limit: PCI (Express) bus

CPU load Almost none for DMA image transfer

Gaps Gaps negatively affect asynchro-

nous performance of widespread

network (round trip delay),

reducing efficiency

No gaps needed, BOSS mode for

parallel arbitration

Table 5: Technical detail comparison: 1394a and 1394b

Note

The bandwidth values refer to the fact:

1 MByte = 1024 kByte

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 308 309

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