UM_NBASE-T_C
OLOUR
REV.E
09/2018
P
A G E
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61
Appendix B.
Timing Diagrams
B.1
Synchronization modes with variable Exposure Time
T
pix
: Timing Pixel. During this uncompressible period, the pixel and its black reference are read out to the
Digital converter. During the first half of this timing pixel (read out of the black reference), we can consider
that the exposure is still active.
Digital Conversion
: During the conversion, the analog Gain is applied by the gradient of the counting ramp
(see next chapter : Gain & Offset). The conversion time depends is
6µs
(in 8bits per color/Pixel)
This conversion is done in masked time, eventually during the next exposure period.
T
d
: Delay between the Start exposure required and the real start of the exposure.
If T
per
is the Line Period (internal or external coming from the Trigger line), in order to respect this
line Period, the Exposure Time as to be set by respecting : T
int
+ T
pix
<= T
per
Then, the real exposure time is : Tint
real
= T
int
+ T
x
- T
d
.
In the same way, The high level period of the Trig signal in sync=3 mode, T
ht
>= T
pix
For a Line Period of
LinePer, the maximum exposure time possible without reduction of line rate
is : Tint
max
= T
per
-T
pix
(T
pix
is defined above) but the effective Exposure Time will be about Tint
real
=
T
int
+
T
x
.
- T
d
.
Digital Conversion
T
pix
Line Trigger
Ext. or Internal
T
d
T
per
Tint
real
Exposure Time
Programmed
ITC Trigger
as Ext. Line Trigger
T
int
(Exposure Time)
T
x
Exposure Time
Internal
Exposure Time
Programmed
T
h
T
ht
Synchro
Mode
Exposure
Mode
Timed
Exposure
Mode
TriggerWidth
In the
Camera /
sensor
No Exposure start before this point
T
intProg
