Photon Focus MV2-D1280-640, User Manual, Page: 52 / 85

5 Hardware Interface
Level-controlled Exposure
In the level-controlled trigger mode, the exposure time is defined by the pulse width of the
external trigger signal. For an active high trigger signal, the image acquisition begins with the
rising edge and stops with the falling edge of the external trigger signal. Then the image is
read out. After that, the sensor returns to the idle state and the camera waits for a new trigger
pulse (see Fig. 5.11). The data is output on the rising edge of the pixel clock, the handshaking
signals
FRAME_VALID
(
FVAL
) and
LINE_VALID
(
LVAL
) mask valid image information. The signal
SHUTTER in Fig. 5.11 indicates the active integration phase of the sensor and is shown for clarity
only.
Level-controlled exposure is supported in simultaneous readout mode.
P C L K
S H U T T E R
F V A L
L V A L
D V A L
D A T A
L i n e p a u s e
L i n e p a u s e L i n e p a u s e
F i r s t L i n e L a s t L i n e
E x p o s u r e
T i m e
F r a m e T i m e
E X S Y N C
C P R E
Figure 5.11: Trigger timing diagramm for level controlled exposure
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