23
6.6
Time response
The following sections describe time response of the camera using a single frame
(OneShot) command. As set out in the IIDC specification, this is a software command
that causes the camera to grab and transmit a single frame.
6.6.1
OneShot command on the bus to start of exposure
The following values apply only under the condition that the camera is idle and ready
for use. Full resolution must also be set.
OneShot->Microcontroller-Sync:
<
600 µs (processing time in the
microcontroller)
µC-Sync/ExSync->Integration-Start
5,5 µs
Microcontroller-Sync is an internal signal. It is used by the microcontroller to initiate a
trigger. This can either be a direct trigger or a release for ExSync if the camera is
triggered externally.
6.6.2
End of exposure to first packet on the bus
After the exposure the CCD is read out and
some data is written into the
FRAME_BUFFER before being transmitted
to the bus.
The time from the end of exposure to the
start of transport on the bus is:
338µs ± 62,5µs
This time jitters with the cycle time of the
bus (125µs).
338µs ± 62,5µs
OneShot Commando
µC->Sync
Integration- Start
x V
a
lu
e
in
R
e
gi
st
er
Offset
First Packet on Bus
< 600µs
5,5µs
29µs
Ex
po
su
re
Value in
TIMEBASE
Register
T
IM
E
B
A
SE x Shutt
er +
O
ffs
e
t
20
µs
x
1
0
0 +
2
9µ
s =
2
02
9
µs
Figure 23 chronological sequence after end of exposure