Allied International V2.4.0 Manual Do Utilizador

 OSCAR Technical Manual V2.4.0

134

As already mentioned, the recommended limit for transferring isochronous 
image data is 1000q (quadlets) per cycle or 4096 bytes (with 400 Mbit/s of 
bandwidth).

The third table shows that in Format_2 Mode_2 @ 7.5 fps a camera has to 
send 1280 pixels or 1 line of video per cycle. The camera therefore uses 32% 
of available bandwidth. This allows up to three cameras with these settings 
to be operated independently on the same bus.

2

0

1280 x 960

16 bit/pixel

YUV (4:2:2)

1H 
1280p 
640q

1/2H 
640p 
320q

1/4H 
320p 
160q

1

1280 x 960

24 bit/pixel

RGB

1H 
1280p 
960q

1/2H 
640p 
480q

1/4H 
320p 
240q

2

1280 x 960

8 bit/pixel

Y (MONO8)

2H 
2560p 
640q

1H 
1280p 
320q

1/2H 
640p 
160q

1/4H 
320p 
80q

3

1600 x 1200

16 bit/pixel

YUV (4:2:2)

5/4H 
2000p 
1000q

5/8H 
1000p 
500q

5/16H 
500p 
250q

4

1600 x 1200

24 bit/pixel

RGB

5/8H 
1000p 
750q

5/16 
500p 
375q

5

1600 x 1200

8 bit/pixel

Y (MONO8)

5/2H 
4000p 
1000q

5/4H 
2000p 
500q

5/8H 
1000p 
250q

5/16H 
500p 
125q

6

1280 x 960

16 bit/pixel

Y (MONO16)

1H 
1280p 
640q

1/2H 
640p 
320q

1/4H 
320p 
160q

7

1600 x 1200

16 bit/pixel

Y (MONO16)

5/4H 
2000p 
1000q

5/8H 
1000p 
500q

5/16H 
500p 
250q

 Table 54: Format_2

L

•

If the cameras are operated with an external trigger the 
maximum trigger frequency may not exceed the highest 
continuous frame rate, so preventing frames from being 
dropped or corrupted.

•

IEEE 1394 adapter cards with PCILynx™ chipsets have a 
lower limit of 4000 bytes per cycle.