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5.3 Read-out Timing
5.3.1 Free running Mode
Sequential readout timing
By default, the camera is in free running mode and delivers images without any external
control signals. The sensor is operated in sequential readout mode, which means that the
sensor is read out after the exposure time. Then the sensor is reset, a new exposure starts and
the readout of the image information begins again. The data is output on the rising edge of
the pixel clock. The signals
FRAME_VALID ( FVAL ) and LINE_VALID ( LVAL ) mask valid image
information. The signal SHUTTER indicates the active exposure period of the sensor and is shown
for clarity only.
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
C P R E
Figure 5.4: Timing diagram sequential readout mode
Simultaneous readout timing
To achieve highest possible frame rates, the camera must be set to "Free-running mode" with
simultaneous readout. The camera continuously delivers images as fast as possible. Exposure
time of the next image can start during the readout time of the current image. The data is
output on the rising edge of the pixel clock. The signals
FRAME_VALID
(
FVAL
) and
LINE_VALID
(
LVAL
)
mask valid image information. The signal
SHUTTER
indicates the active integration phase of the
sensor and is shown for clarity only.
5.3 Read-out Timing 45