Camera interfaces
MARLIN Technical Manual
V2.4.0
61
Pixel data
Pixel data are transmitted as isochronous data packets in accordance with
the 1394 interface described in IIDC V1.3. The first packet of a frame is iden-
tified by the
1
in the
sync bit
(sy) of the packet header.
Note
L
•
Note that
trigger delay
in fact delays the image cap-
ture whereas the
IntEna_Delay
only delays the leading
edge of the IntEna output signal but does not delay the
image capture.
•
As mentioned before, it is possible to set the outputs
by software. Doing so, the achievable maximum fre-
quency is strongly dependent on individual software
capabilities. As a rule of thumb, the camera itself will
limit the toggle frequency to not more than 700 Hz.
0-7
8-15
16-23
24-31
data_length
tg
channel
tCode
sy
header_CRC
Video data payload
data_CRC
Figure 28: Isochronous data block packet format: Source: IIDC V1.3
sync bit