Instruction Manual

Data interface
Goldeye Technical Manual V2.5.0
49
Timing (FVAL, LVAL, DVAL, PCLK)
The Camera Link specification provides three synchronization signals:
• FVAL (Frame Valid) – HIGH during transmission of valid lines of an image.
• LVAL (Line Valid) – HIGH during transmission of valid pixels of a line.
• DVAL (Data Valid) – HIGH in the case valid pixel data are present.
The gross pixel rate at the InGaAs sensor is 10.5 MHz.
However, the maximum available bandwidth of the Camera Link Base
configuration is not nearly exploited. The transmission components require a
minimum clock frequency for a safe operation. For this reason, the internal
clock frequency is artificially increased before being output as Camera Link
clock signal.
As a consequence, an unnecessary high data rate would occur at the frame
grabber, and, thus, a multiple of the essential data volume ought to be moved
within the storage of the receiver. Now the DVAL signal offers the opportunity
to explicitly mark particular data words as valid so that only the essential pixel
data are stored in the frame grabber memory.
GigE feature name
(AcquisitionControl)
Feature visibility Description
TriggerMode Beginner Modifies the trigger mode of the camera. When the
trigger mode is Off, the camera will generate
frames independently.
When the trigger mode is On, the camera is
switched to the image-on-demand (IOD) mode. In
this mode the camera waits for an external trigger
signal or a timer pulse. To control the exposure and
the dark time trigger, mode must be switched to On.
Table 25: Camera special feature: Trigger mode
Note

To ensure that the frame grabber does not only evaluate the
signals FVAL and LVAL, select a frame grabber (and developing
software), that also supports DVAL.