Instruction manual

Table Of Contents
Camera interfaces
PIKE Technical Manual V3.1.0
96
Pixel data
Pixel data are transmitted as isochronous data packets in accordance with
the 1394 interface described in IIDC V1.31. The first packet of a frame is
identified 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.
Field Description
data_length Number of bytes in the data field
tg Tag field
shall be set to zero
channel Isochronous channel number, as programmed in the iso_channel
field of the cam_sta_ctrl register
tCode Transaction code
shall be set to the isochronous data block packet tCode
Table 41: Description of Data Block Packet Format
0-7 8-15 16-23 24-31
data_length tg channel tCode sy
header_CRC
Video data payload
data_CRC
Table 40: Isochronous data block packet format. Source: IIDC V1.31
sync bit