Exsync, Programmable Mode With Asynchronous Timing - Basler A500k User Manual

Basic Operation and Features

3.3.3.1 ExSync, Programmable Mode with Asynchronous Timing

ExSync
Frame
Valid
Line
Valid
Integrate
Enabled
TIMING CHARTS ARE NOT DRAWN TO SCALE
Figure 3-16: ExSync, Programmable Mode - Exposure Start and Stop with Frame Valid Low
The effective exposure occurs while the Frame Valid signal is low. The FlashOut signal is set to
high while the effective exposure occurs. The start, stop, and duration of the effective exposure
are defined in the following ways (see Figure 3-16):
• The effective exposure starts d microseconds after the rise of the ExSync signal (exposure
start delay).
• Disregarding possible jitter, the duration of the effective exposure is defined by period p (set
by Timer 1).
• Jitter (f) may shorten the effective exposure, i.e. duration of the effective exposure = p - f.
Due to the propagation time of approximately 1 µs, ExSync can go high up to 1 µs before the
Frame Valid signal goes low.
p
d
f
3-20
PRELIMINARY
p = Timer 1
d = 1.7 µs (A504k)
d = 1.7 µs (A503k)
d = 7.2 µs (A501k)
p = Timer 1
f = 0 µs (A504k)
f = 0 µs (A503k)
f = 5.5 µs (A501k)
k
A504 A503
Exposure as set by Timer 1
1.7 µs 1.7 µs
0 µs 0 µs
ExSync Period
4.7 µs (A504k)
5.5 µs (A503k)
26.4 µs (A501k)
k k
A501
7.2 µs

5.5 µs
k
Basler A500