Pike
Technical
Manual
V5.2.3
95
Camera interfaces
Camera
interfaces
Example
1:
Set
PWM
with
1kHz
at
30%
pulse
width.
Example
2:
Set
PWM
with
250
Hz
at
12%
pulse
width.
Pixel data
Pixel
data
are
transmitted
as
isochronous
data
packets
in
accordance
with
the
IEEE1394
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.
0
to
7
8
to
15
16
to
23
24-31
data_length
tg
channel
tCode
sy
header_CRC
Video
data
payload
data_CRC
Table 34: Isochronous data block packet format. Source: IIDC V1.31
sync bit
Formula 2: PWM example 1
Formula 3: PWM example 2
RegPeriod
1
frequency
6
–
10 s
--------------------------------------
1
1kHz
6
–
10 s
---------------------------
1000
=
=
=
RegPulseWidth
RegPeriod
30%
1000
30%
300
=
=
=
RegPeriod
1
frequency
6
–
10 s
--------------------------------------
1
250Hz
6
–
10 s
------------------------------
4000
=
=
=
RegPulseWidth
RegPeriod
12%
4000
12%
480
=
=
=
